NASA GHRC Collaboration between NASA MSFC and The University of Alabama in Huntsville
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      • HyDRO is GHRC's custom dataset search and order tool.

        With HyDRO, you can search, discover, and filter GHRC's dataset holdings.

        HyDRO will also help you find information about browse imagery, access restrictions, and dataset guide documents.
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      • The GHRC Coincidence Search Engine (CSE) may be used to search for times when up to four satellites were over or within the same geographic area simultaneously.

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      • This is our current OPeNDAP server.

        You can access, download, and subset selected datasets with THREDDS. You can also obtain WMS links and applicable documentation and browse images for some datasets.
    • Storm Tracks DB
      • The Tropical Storm Tracks database is derived from the storm data published by the National Hurricane Center (NHC).

        This web page provides a convenient user interface for casually browsing storm information, including location, category, and wind speed.
    • AMSU Temp Trends
      • Daily averaged temperatures of the Earth are measured by the Advanced Microwave Sounding Unit (AMSU) on NASA's Aqua satellite.
    • NASA Earthdata Search
      • Earthdata is NASA's next generation metadata and service discovery tool, providing search and access capabilities for dataset holdings at all of the Distributed Active Archive Centers (DAACs) including the GHRC.
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      • View the latest additions to our data holdings using HyDRO.
  • Measurements
  • Field Campaigns
    • Hurricane Science
      • GHRC has worked with NASA's Hurricane Science Research Program (HSRP) since the 1990's. We are the archive and distribution center for data collected during HSRP field campaigns, as well as the recent Hurricane Science and Severe Storm Sentinel (HS3) Earth Venture mission. Field campaigns provide for intensive observation of specific phenomena using a variety of instruments on aircraft, satellites and surface networks.

        GHRC also hosts a database of Atlantic and Pacific tropical storm tracks derived from the storm data published by the National Hurricane Center (NHC).
    • HS3 (2012-14)
      • Hurricane and Severe Storm Sentinel (HS3) is an Earth Ventures – Suborbital 1 mission aimed at better understanding the physical processes that control hurricane intensity change, addressing questions related to the roles of environmental conditions and internal storm structures to storm intensification.

        A variety of in-situ, satellite observations, airborne data, meteorological analyses, and simulation data were collected with missions over the Atlantic in August and September of three observation years (2012, 2013, 2014). These data are available at GHRC beginning in 2015.
    • GRIP (2010)
      • The Genesis and Rapid Intensification Processes (GRIP) experiment was a NASA Earth science field experiment in 2010 that was conducted to better understand how tropical storms form and develop into major hurricanes.

        The GRIP deployment was 15 August – 30 September 2010 with bases in Ft. Lauderdale, FL for the DC-8, at Houston, TX for the WB-57, and at NASA Dryden Flight Research Facility, CA for the Global Hawk.
    • TC4 (2007)
      • The NASA TC4 (Tropical Composition, Cloud and Climate Coupling) mission investigated the structure and properties of the chemical, dynamic, and physical processes in atmosphere of the tropical Eastern Pacific.

        TC4 was based in San Jose, Costa Rica during July 2007.

        The Real Time Mission Monitor provided simultaneous aircraft status for three aircraft during the TC4 experiment. During TC4, the NASA ER-2, WB-57 and DC-8 aircraft flew missions at various times. The science flights were scheduled between 17 July and 8 August 2007.
    • NAMMA (2006)
      • The NASA African Monsoon Multidisciplinary Analyses (NAMMA) campaign was a field research investigation based in the Cape Verde Islands, 350 miles off the coast of Senegal in west Africa.

        Commenced in August 2006, NASA scientists employed surface observation networks and aircraft to characterize the evolution and structure of African Easterly Waves (AEWs) and Mesoscale Convective Systems over continental western Africa, and their associated impacts on regional water and energy budgets.
    • TCSP (2005)
      • The Tropical Cloud Systems and Processes (TCSP) mission was an Earth science field research investigation focused on the study of the dynamics and thermodynamics of precipitating cloud systems and tropical cyclones. TCSP was conducted during the period July 1-27, 2005 out of the Juan Santamaria Airfield in San Jose, Costa Rica.

        The TCSP field experiment flew 12 NASA ER-2 science flights, including missions to Hurricanes Dennis and Emily, Tropical Storm Gert and an eastern Pacific mesoscale complex that may possibly have further developed into Tropical Storm Eugene.
    • ACES (2002)
      • The Altus Cumulus Electrification Study (ACES) was aimed at better understanding the causes and effects of electrical storms.

        Based at the Naval Air Station Key West in Florida, researchers in August 2002 chased down thunderstorms using an uninhabited aerial vehicle, or "UAV", allowing them to achieve dual goals of gathering weather data safely and testing new aircraft technology. This marked the first time a UAV was used to conduct lightning research.
    • CAMEX-4 (2001)
      • The Convection And Moisture EXperiment (CAMEX) was a series of NASA-sponsored hurricane science field research investigations. The fourth field campaign in the CAMEX series (CAMEX-4) was held in 16 August - 24 September, 2001 and was based out of Jacksonville Naval Air Station, Florida.

        CAMEX-4 was focused on the study of tropical cyclone (hurricane) development, tracking, intensification, and landfalling impacts using NASA-funded aircraft and surface remote sensing instrumentation.
    • CAMEX-3 (1998)
      • The Convection And Moisture EXperiment (CAMEX) is a series of hurricane science field research investigations sponsored by NASA. The third field campaign in the CAMEX series (CAMEX-3) was based at Patrick Air Force Base, Florida from 6 August - 23 September, 1998.

        CAMEX-3 successfully studied Hurricanes Bonnie, Danielle, Earl and Georges, yielding data on hurricane structure, dynamics, and motion. CAMEX-3 collected data for research in tropical cyclone development, tracking, intensification, and landfalling impacts using NASA-funded aircraft and surface remote sensing instrumentation.
    • GPM Ground Validation
      • The NASA Global Precipitation Measurement Mission (GPM) Ground Validation (GV) program includes the following field campaigns:

        a) LPVEx, Gulf of Finland in autumn 2010, to study rainfall in high latitude environments

        b) MC3E, cental Oklahoma spring and early summer 2011, to develop a complete characterization of convective cloud systems, precipitation and the environment

        c) GCPEx, Ontario, Canada winter of 2011-2012, direct and remove sensing observations, and coordinated model simulations of precipitating snow.

        d) IFloodS, Iowa, spring and early summer 2013, to study the relative roles of rainfall quantities and other factors in flood genesis.

        e) IPHEx, N. Carolina Appalachians/Piedmont region May-June 2014, for hydrologic validation over varied topography.

        f) OLYMPEx, Washington's Olympic Peninsula scheduled November 2015-February 2016, for hydrologic validation in extreme coastal and topographic gradients
    • OLYMPEX (Upcoming)
      • The OLYMPEX field campaign is scheduled to take place between November, 2015, and February, 2016, on the Olympic Peninsula in the Pacific Northwest of the United States.

        This field campaign will provide ground-based validation support of the Global Precipitation Measurement (GPM) satellite program that is a joint effort between NASA and JAXA.

        As for all GPM-GV campaigns, the GHRC will provide a collaboration portal to help investigators exchange planning information and to support collection of real-time data as well as mission science, project and instrument status reports during the campaign.
    • IPHEx (2014)
      • The Integrated Precipitation and Hydrology Experiment (IPHEx) was conducted in North Carolina during the months of April-June, 2014.

        IPHEx sought to characterize warm season orographic precipitation regimes, and the relationship between precipitation regimes and hydrologic processes in regions of complex terrain.
    • IFLOODs (2013)
      • The Iowa Flood Studies (IFloodS) experiment was conducted in the central to northeastern part of Iowa in Midwestern United States during the months of April-June, 2013.

        IFloodS' primary goal was to discern the relative roles of rainfall quantities such as rate and accumulation as compared to other factors (e.g. transport of water in the drainage network) in flood genesis.
    • GCPEX (2011-2012)
      • The GPM Cold-season Precipitation Experiment (GCPEx) occurred in Ontario, Canada during the winter season (Jan 15- Feb 26) of 2011-2012.

        GCPEx addressed shortcomings in GPM snowfall retrieval algorithm by collecting microphysical properties, associated remote sensing observations, and coordinated model simulations of precipitating snow. Collectively the GCPEx data set provides a high quality, physically-consistent and coherent data set suited to the development and testing of GPM snowfall retrieval algorithm physics.
    • MC3E (2011)
      • The Mid-latitude Continental Convective Clouds Experiment (MC3E) took place in central Oklahoma during the April–June 2011 period.

        The overarching goal was to provide the most complete characterization of convective cloud systems, precipitation, and the environment that has ever been obtained, providing constraints for model cumulus parameterizations and space-based rainfall retrieval algorithms over land that had never before been available.
    • LPVEx (2010)
      • The Light Precipitation Evaluation Experiment (LPVEx) took place in the Gulf of Finland in September and October, 2010 and collected microphysical properties, associated remote sensing observations, and coordinated model simulations of high latitude precipitation systems to drive the evaluation and development of precipitation algorithms for current and future satellite platforms.

        In doing so, LPVEx sought to address the general lack of dedicated ground-validation datasets from the ongoing development of new or improved algorithms for detecting and quantifying high latitude rainfall
  • Projects
    • HS3 Suborbital Mission
      • Hurricane and Severe Storm Sentinel (HS3) is an Earth Ventures – Suborbital 1 mission aimed at better understanding the physical processes that control hurricane intensity change, addressing questions related to the roles of environmental conditions and internal storm structures to storm intensification.
    • DISCOVER - MEaSUREs
      • DISCOVER was funded by NASA’s MEaSUREs program to provide highly accurate, multi-decadal geophysical products derived from satellite microwave sensors.
    • LIS Mission
      • Lightning observations from the Lightning Imaging Sensors (LIS) aboard the NASA’s TRMM satellite and International Space Station, as well as airborne observations and ground validation data.
    • SANDS
      • The SANDS project addressed Gulf of Mexico Alliance priority issues by generating enhanced imagery from MODIS and Landsat data to identify suspended sediment resulting from tropical cyclones. These tropical cyclones have significantly altered normal coastal processes and characteristics in the Gulf region through sediment disturbance.
    • LANCE AMSR2
      • The Land, Atmosphere Near real-time Capability for EOS (LANCE) system provides access to near real-time data (less than 3 hours from observation) from AIRS, AMSR2, MLS, MODIS, and OMI instruments. LANCE AMSR2 products are generated by the AMSR Science Investigator-led Processing System at the GHRC.
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      • The GHRC Innovations Lab is a showcase for emerging geoinformatics technologies resulting from NASA-sponsored research at the University of Alabama in Huntsville.
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Lightning & Atmospheric Electricity Research

Lightning Home

The Lightning Team

A Lightning Primer

File Cabinet and Bookshelf

 

Global Lightning Image
Global Lightning Image
Global lightning strikes from January 1998 to present day from the NASA/MSFC Lightning Imaging Sensor

File Cabinet and Bookshelf

White Paper on Lightning Detection from Space by Kevin Driscoll

OTD MicroLab

Tropical Rainfall Measuring Mission


LIS and OTD Science Accomplishments

A three year global lightning data base has been developed from the EOS Optical Transient Detector (OTD). This is the most comprehensive global lightning data base ever produced and is noteworthy for its high spatial resolution, detection efficiency, coverage, and three year period of record. The Lightning Imaging Sensor (LIS) was launched in November 1997 aboard the Tropical Rainfall Measuring Mission (TRMM). The LIS features enhanced sensitivity, higher spatial resolution, and greater location accuracy than the OTD. The excellent performance of the LIS and OTD has lead to the following scientific discoveries:

  • The global lightning flash rate is on the order of 40 flashes per second (fps) as compared to the commonly accepted value of 100 fps, an estimate that dates back to 1925.
  • Seventy percent of all lightning activity occurs in the tropics, with the global distribution dominated by the summertime lightning activity over the N. Hemisphere land masses.
  • At low latitudes, there appears to be a bi-annual lightning peak occurring at the equinoxes.
  • Over large bodies of water, circulations driven by the land-sea temperature contrast plays an important role, with peak activity occurring during winter when the land is colder than the water (Mediterranean Sea, Tasman Sea).
  • There is significantly more wintertime lightning activity over the N. Atlantic Ocean than previously documented by shipboard observations (COADS data base).
  • Identified inner eyewall lightning activity in hurricanes during periods of changing intensification (e.g., Hurricane Linda (OTD); Super Typhoon Paka (LIS)). Eyewall lightning observed by LIS found in association with ice scattering signatures identified by the TMI instrument (cyclone Susan).
  • Identified a lightning burst signature associated with severe storm development and tornadogenesis. Signature reconfirmed during the LIS validation activity.
  • Identified optical signature for long continuing currents produced by cloud-to- ground discharges.

The diurnal variation of lightning strongly peaks in the late afternoon over land and is relatively small over water. The solar flux and its associated warming dominates the seasonal variation. The inter-annual variability is much smaller than the diurnal or seasonal variations suggesting that strong convection leading to lightning is driven more by local solar flux (hence the large late afternoon maximum) rather than changes in large scale circulation patterns (See Figure 2 through Figure 7). [Note: the 97-98 El Nino event has not yet been evaluated]

OTD observations indicate that intercloud lightning activity far exceeds cloud to ground activity during initial storm growth and development, and also when storms become severe. During an overpass of a tornadic supercell thunderstorm, OTD detected a pattern of a dramatic increase in flash rate followed by a decreasing rate. A tornado formed shortly after the pass. This sequence parallels that of airmass thunderstorms where it is well established that the flash rates increase during updrafts and decrease sharply with the onset of a downdraft. These observations are also consistent with theories of tornadogenesis involving the stretching of vorticity by the updraft prior to the subsequent tornado formation at the ground (See Figure 8).

This new understanding on the interplay among the intensification of the updraft, lightning bursts, and the onset of severe weather lead to the establishment of a validation campaign to further explore relationships between lightning and severe weather. Findings to date indicate that high flash rate storms have a high probability of becoming severe (See Figure 9 through Figure 12). Further, there appears to be an identifiable signature in the flash rate (these sudden increases or bursts) associated with intensification of the updraft. The burst signature occurred an average of nine minutes before the NWS identified a storm as being severe, primarily based on NEXRAD signatures. Lightning burst signatures have been identified preceding the nocturnal tornadic storms which formed during the February 22-23 severe weather outbreak in central Florida (See Figure 13).

The continuing current signature observed by OTD was observed within a large storm complex when one pixel stayed illuminated for many successive frames for a total duration exceeding 100 milliseconds (See Figure 14). The significance of this observation is that lightning discharges with continuing current are responsible for most naturally occurring forest and wildland fires that occur in North America. The ability to provide real time continuing current warnings in areas of high fire risk potential may prove valuable for forest fire fighting operations.

With TRMM, we are now able to simultaneously observe relationships between lightning activity and the ice content of storms. We can test our hypotheses that ice formation and updrafts play the controlling roles in cloud electrification, thus providing an unique approach for remotely sensing updraft intensity and ice phase precipitation. Early review of a few cases clearly indicate that those oceanic storms that are not producing lightning (the majority) have little or no mass above the freezing level. Precipitation-sized ice is clearly indicated in those storms that are lightning producers. We are in the process of quantifying these observations (See Figure 15 and 16).

We have also been investigating the electrification of tropical cyclones and hurricanes. In 1995, all named Atlantic tropical cyclones and hurricanes produced some lightning during one or more OTD overpasses. However, throughout much of their life-cycle these storms produce little or no lightning. When lightning is present, it is normally contained in the eye wall or rain bands (See Figure 17 through Figure 19). From initial TRMM observations, we have determined that ice scattering signatures are present in all cases when lightning was detected. While there is much research to be done on lightning in tropical cyclones, early indications are that the occasional, sudden bursts of lightning that occur in these storms is associated with a change in tropical cyclone intensification.



Lightning Mapping Sensor

Applications

A proposed total Lightning Mapping Sensor (LMS) in geosynchronous orbit offers significant benefits to the Nation, specifically in areas of severe convective weather warnings, and aviation weather support (See Figure 20). The LMS conceived by NASA MSFC is a follow-on to the LIS, featuring improved coverage and the ability to observe storms throughout their life-cycle. In geosynchronous orbit, the LMS would provide continuous, real-time surveillance of lightning activity over large portions of the North and South American continents and surrounding oceans (See Figure 21). It would potentially enhance operational weather forecasting capabilities as well as provide data for scientific studies of convective processes on a continental scale. In contrast to the current National Lightning Detection Network (NLDN), LMS would observe total lightning activity, including the dominant intracloud (IC) component, which is estimated to occur with order of magnitude greater frequency than cloud-to-ground (CG) lightning and may occur ten minutes or more in advance of the first ground flash in a storm. The possible operational benefits of LMS in areas of primary utility to the U.S. public:

  • Improvement to the lead time and/or reliability of warnings for tornadoes, damaging thunderstorm winds and hail;
  • Augmented warning capability for thunderstorm flash floods in mountainous areas where the NEXRAD weather radar network’s coverage is incomplete due to beam blockage;
  • Reduced toll from cloud-to-ground lightning strikes owing to more reliable identification of electrically active storms;
  • Improved efficiency and/or safety in the aviation system operation through provision of relevant information on thunderstorm phenomena, particularly over oceanic regions where current sensor coverage is limited;
  • Improved forest and wild fire operations through the targeting of most probable ignition sites;
  • Improved observations of rapidly evolving tropical cyclone and hurricane intensification prior to landfall.

These benefits are estimated based on assessments of LMS' ability to enhance warning or decision making capability beyond that achievable with current operational sensors.


Figures
(click on any of the images below to enlarge)

OTD MicroLab Figure 1a. - The Optical Transient Detector (OTD) was launched April, 1995 aboard the MicroLab-1 satellite to study the global distribution and variability of lightning activity. The satellite is in orbit at an altitude of 740 km and an inclination of 70 degrees. The OTD total field of view is 1300 km across and the pixel resolution is 8 km at nadir. An individual storm within the OTD field of view can be viewed for approximately three minutes.

Tropical Rainfall Measuring Mission Figure 1b. - The Lightning Imaging Sensor (LIS) was launched November 28, 1997 on the NASA Tropical Rainfall Measuring Mission (TRMM) satellite to study cloud processes, precipitation, and the distribution and variability of tropical thunderstorms. The TRMM is in orbit at an altitude of 350 km and an inclination of 35 degrees. The LIS total field of view is 600 km across and the pixel resolution is 4 km at nadir. At this altitude, the LIS observes an individual cloud for 80 sec.

Annual cycle of global flash rate Figure 2. - Annual cycle of the global flash rate observed by the OTD (September 1995-August 1996). More than 1.2 billion flashes occurred in this time period. The average flash rate is 37 flashes per second (intracloud and cloud-to-ground flashes combined) with a maximum of 54 flashes per second in the Northern Hemisphere summer and a minimum of 29 flashes per second in the Northern Hemisphere winter. The annual average flash rate over the oceans is 7 flashes per second, while the flash rate over land ranges from 24-49 flashes per second.

Diurnal variation of global ligntning activity Figure 3. - The diurnal variation of global lighting activity is more pronounced over the land than the ocean. The afternoon peak in lightning activity follows the mid-late afternoon solar heating of the land. Approximately 60 percent of the land-based lightning occurs between noon and 8 p.m. local time, whereas oceanic lightning has no significant variation throughout the diurnal cycle.

Latitudinal distribution of global lightning activity Figure 4. - Latitudinal distribution of global lightning activity calculated for latitude bands centered at the equator (September 1995-August 1996). Over seventy percent of the lightning occurs in the tropical belt between 30 degrees north and south latitudes. Due to the distribution of land masses, more lightning occurs poleward of 30 degrees in the Northern Hemisphere than in the same region of the Southern Hemisphere.

The global distribution of total lightning flash density Figure 5. - The global distribution of total lightning flash density observed by the OTD (September 1995-August 1996). The equatorial land masses are the major regions of activity with equatorial Africa dominant throughout the year.

The Observation of Lightning Activity Figure 6. - The seasonal variation of total lightning flash density observed by the OTD (September 1995-August 1996). The continents are more electrically active in the respective summer months, while the oceans tend to be more active in the winter months.

LIS Total Lightning Activity Figure 7. - Prliminary observations of Northern Hemisphere wintertime lightning activity as observed by the LIS (December 1997- February 1998). As with OTD, the oceanic basins are very active during the Northern Hemisphere winter.

OTD observation of extreme lightning activity Figure 8. - OTD observations of extreme lightning activity produced by a tornadic Oklahoma thunderstorm, April 17, 1995. The storm was dominated by intracloud lightning activity. Flash rates decrease prior to tornado (top). GOES-E image of storm (lower left). A large number of flashes were observed in a small area corresponding with the location of the tornadic storm cell (lower right).

OTD and LIS Observations of Lightning activity on January 22, 1998 Figure 9. - OTD (left) and LIS (right) observations of lightning activity on January 22, 1998, corresponding with a "heavy rain event" in Houston, Texas (Houston is a TRMM ground trouth site). The OTD observations were approximately 2 hours before the LIS observations.

A comparison of TRMM observations made by LIS and TMI Figure 10. - A comparison of TRMM observations made by LIS and TMI (85-GHz) during an overpass of Houston, Texas on January 22, 1998.

A comparison of TRMM observations made by LIS and the Precipitation Radar Figure 11. - A comparison of TRMM observations made by LIS and the Precipitation Radar during an overpass of Houston, Texas on January 22, 1998.

A comparison of TRMM observations made by LIS and VIRS Figure 12. - A comparison of TRMM observations made by LIS and VIRS during an overpass of Houston, Texas on January 22, 1998.

Extreme intracloud lightning activity Figure 13. - Extreme intracloud lightning activity produced by one of the nocturnal tornadic storms that hit central Florida on February 23, 1998. Total lightning flash density during the interval 04:50-05:00 UTC observed by KSC Lightning Detection and Ranging (LDAR) system (upper right). Lightning "jump" associated with intensifying updraft occurred approximately 20 minutes prior to the tornado (lower right). Total flash rate exceeded 400 flashes per minute and began to diminish 10-15 minutes prior to the tornado. Composite radar reflectivity map at 05:00 UTC showing the line of severe storms that passed through central Florida (left).

Cloud-to-ground lightning flash
Figure 14. - Cloud-to-ground lightning flash with continuing current observed by OTD within the trailing stratiform rain region of a mesoscale weather system (top). Time series of lightning optical pulses (middle) and time of occurrence for cloud-to-ground flashes (bottom).

LIS and TMI 85-GHz observations of a squall line on March 9, 1998 Figure 15. - LIS and TMI 85-GHz observations of a squall line on March 9, 1998. Lowest TMI brightness temperatures indicate scattering by precipitation-sized ice particles.

LIS and TMI 37-GHz observations of a squall line on March 9, 1998 Figure 16. - LIS and TMI 37-GHz observations of a squall line on March 9, 1998.

LIS observation of hurricane lightning Figure 17. - LIS observation of hurricane lightning in the eyewall and rainband of Topical Cyclone Susan on January 5, 1998(right); Storm track for cyclone Susan (left).

Hurricane Linda eyewall lightning Figure 18. - Hurricane Linda eyewall lightning observed by the OTD during a period of changing intensity on September 12, 1997.

Storm track and intensity history for Hurricane Linda Figure 19. - Storm track and intensity history for Hurricane Linda. Linda was one of the strongest Eastern Pacific hurricanes on record.

The proposed Lightning Mapping Sensor Figure 20. - The proposed Lightning Mapping Sensor continuously observes individual storms within all of the contiguous United States, most of South America, and the adjacent oceans extending several thousand kilometers outward from the Atlantic and Pacific coasts from its position in geostationary orbit.

Proposed Lightning Mapper field-of-view for GOES-East (right) and GOES-West (left) Figure 21. - Proposed Lightning Mapper field-of-view for GOES-East (right) and GOES-West (left).

 

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