GLM observes a long flash in Minnesota

One of the unique, new features of the Geostationary Lightning Mapper, or GLM, is the instrument’s ability to observe the spatial extent of lightning flashes.  This capability had been previously demonstrated with the ground-based lightning mapping arrays (LMAs).  The LMAs, however, only have a range of 200 km versus the GLM’s near hemispheric field of view.

The figure below shows the 1 min, 8 km GLM group density plot in AWIPS.  The GLM data have been intentionally made all yellow to highlight spatial extent only.  The GLM data are overlaid on the Advanced Baseline Imager (ABI) daytime convection red-green-blue (RGB) composite.  Here, the brighter, more yellow cloud tops indicate newer, more vigorous convection give large numbers of small, ice particles.  The redder cloud types are more mature/dissipating convection due to warmer cloud tops and amount of larger ice particles.  The GLM observes a flash that extends well behind the main convection (observed by the radar mosaic) and spans over 100 miles.  The extent is roughly between Duluth, Minnesota and International Falls, Minnesota.  This example shows the importance that the spatial extent of GLM observations can play in lightning safety as the threat of lightning is non-zero, even after the main convective line has passed.  This case will be analyzed further to compare with the National Lightning Detection Network and Earth Networks observations.


Figure:  AWIPS screen capture of 1 min, 8 km GLM group densities (yellow, filled) overlaid on the ABI daytime convection RGB, along with the corresponding radar mosaic from NOAA (inset).  Annotations highlight the main features, particularly a long flash observed by the GLM (black dashed oval) that extended around 100 miles in the stratiform region across Minnesota on June 13, 2017.

NOTE:  NOAA’s GOES-16 satellite has not been declared operational and its data are preliminary and undergoing testing. Users receiving these data through any dissemination means  (including, but not limited to, PDA and GRB) assume all risk related to their use of GOES-16 data and NOAA disclaims any and all warranties, whether express or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. 

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