GOES-R CI and PGLM During the AWC Summer Experiment

The GOES-R CI (developed by the University of Alabama in Huntsville) and NASA SPoRT’s Pseudo-GLM have been participating with the Aviation Weather Center’s Summer Experiment since last week.  Yesterday (August 20th) had an interesting event with both.

At 1432 UTC (Figure 1), the GOES-R CI was providing a modest probability of convection along the Walker and Jefferson County border (highlighted by the yellow scallops).


The first signs of radar reflectivity occurred at 1532 UTC (Figure 2).  The reflectivity had not yet reached 35 dBZ, which is the official definition for convective initiation.


Figure 2: Initial radar reflectivity at 1536 UTC.

The CI algorithm strongly highlighted this particular region at 1545 UTC (Figure 3), when the probability reached into the 80% range.  What is particularly interesting was that this region was the only one across North Alabama that received such a high probability.  The CI probability would be verified 30 minutes later when the radar reflectivity exceeded 35 dBZ (not shown).

20130820_1545CIAfter this large probability of CI, the first PGLM flash was observed at 1550 UTC (Figure 4).


Figure 4: First PGLM flash observations at 1550 UTC.

The first cloud-to-ground strike was observed at 1622 UTC (Figure 5).


Figure 5: Pseudo-GLM flash density at 1622 UTC with the first observed cloud-to-ground strike.

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