[22:00 UTC] Storm strength has really increased over the past hour or so in the Billings area with several intense updrafts having developed: a few in Rosebud County and one in central Yellowstone County. Test warnings were issued based on sudden and rapid increases in several of the GLM products (most notably total energy and extent density). Interestingly though, review of ProbSevere and ProbHail showed percentages that were a little lower than would be expected, especially as MESH was near and in excess of 1.5" with several of the storms. Most notably, a test warning was issued for the storm in central Yellowstone County about 30 minutes before a TBSS signature appeared on the 3.1 and 4.0 elevation scans from KBLX.
GLM data proved to be beneficial in analysis of the storms and issuance of the ensuing warnings. In fact, the sudden jumps in data provided more of a "head-start" in this afternoon's environment than did the ProbSevere products.
Rosie Red & Penny Gardens
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