This forum supports Geostationary Lightning Mapper (GLM) implementation and training.  The page provides a vehicle for learning about the GLM capabilities and limitations, exploring GLM applications, understanding data quality, and addressing GLM inquiries.

The first Geostationary Lightning Mapper (GLM) launched into orbit aboard the first Geostationary Operational Environmental Satellite R-series (GOES-R), becoming GOES-16 after reaching geostationary orbit on 29 November 2016. The GLM on GOES-16 is the first of four instruments that will provide lightning mapping over most of the western hemisphere through 2036.

The GLM performance meets or exceeds all program specifications, but the data quality will continue to improve.  Simultaneous development and implementation efforts aim to improve the operational utility of the GLM data. New visualizations have been developed for the NWS Advanced Weather Interactive Processing System (AWIPS) software.

Sample desktop backgrounds... MariaIrmaHarveyThree Hurricanes, or Lake Maracaibo

Near real time imagery is available at http://lightning.umd.eduhttp://col.st/haYgj, and http://col.st/WtVLp

Example GLM Imagery



What's New

Optical Extinction Example

There appeared to be a good case of optical extinction with a severe warned storm near the Hughes/McIntosh county line in southeast Oklahoma on 10 October, 2019. ENI data showed a tight...

When the GLM detects Lightning that isn't Lightning

Because the GLM is an optical detector and looks for changes in brightness over a certain time interval, there will be times that sun glint off of various objects will result in a false...

GLM and Public Safety: An Important Caveat

As great as is to use data from the Geostationary Lightning Mapper, there is an important caveat forecasters have to consider when using the data. During the afternoon of July 11,...

Lone Left-moving Supercell

On 19 July 2018 a lone, left-moving supercell was observed with GLM moving from eastern Kansas into western Missouri. The loop below has 1-min GLM Flash Extent Density with IR...

Periphery, single, small, dim flashes on central Great Plains stormsĀ 

While monitoring GLM across the central Great Plains on 19 Jun 2018 it was noted that several storm clusters showed single, small, dim flashes along their trailing edges. These...