19 Feb 2025 - 08:06 EST
19 Feb 2025 - 13:06 UTC
19 Feb 2025 - 13:06 UTC
GOES-West Mesoscale view - Geostationary Lightning Mapper at 39°N - 118°W - Nye County, NV
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Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0928 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0929 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0930 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0931 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0932 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0933 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0934 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0935 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0936 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0937 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0938 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0939 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0940 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0941 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0942 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0943 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0944 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0945 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0946 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0947 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0948 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0949 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0950 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0951 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0952 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0953 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0954 UTC

Geostationary Lightning Mapper - Lightning flash extent density over IR Band 13 - 01 Aug 2024 - 0955 UTC


GLM Flash Extent Density over Band 13 is the number of lightning flashes that occur within a grid cell over a given period of time. FED was the first GLM product routinely available to weather service forecasters. The FED product is the best single metric to convey both the quantity and extent of lightning activity. It is useful for both storm trending applications and to depict geographic coverage.
In the FED13 visualization, GLM is superimposed on infrared Band 13 rendered in gray scale.
GLM data is produced between 54°N and 54°S.
• For more details, see the Geostationary Lightning Mapper Quick Guide, (PDF, 1.98 MB)