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All posts for the day April 25th, 2019

Texas Tornado and GLM Lightning Jump

Posted by Bill Line on 04/25/2019
Posted in: Uncategorized. 3 Comments

A late night tornado passed through the town of San Augustine, TX during the evening of 24 April 2019. GOES-16 GLM Flash Extent Density data showed a significant increase in lightning activity (lightning jump), during the 10-20 minute period prior to the tornado LSR at 0420 UTC on the 25th. Below are examples of the 1-min FED product (Fig 1), as well as the 5-min accumulation FED product (updating every 1-min as well; Fig 2), which provides a smoother view of the lightning trends. The rapid increase in lightning is distinguishable in both products with this case. ABI IR (gray-scale), tornado (red) and severe thunderstorm (yellow) warnings, along with the Tornado LSR (yellow symbol), are also included in both animations. The graphs below show the rapid increase in FED and peak prior to 0420 UTC (Fig 3).

Figure 1: 24 April 2019 GOES-16 1-min IR, 1-min GLM FED, warnings, and LSRs. Full res
Figure 2: 24 April 2019 GOES-16 1-min IR, 5-min GLM FED (updating every 1-min), warnings and LSRs. Full res
Figure 3: 24 April 2019 GOES-16 GLM 1-min FED (Top) and 5-min with 1-min update FED (bottom). Full res

Bill Line, NWS