Slide 1: 1855Z Based on Donovan method we would be issuing a severe thunderstorm warning when the 50 dbz core reached 26,000 to 28,000ft based on a freezing level of around 10,000 to 10,600ft agl. This would have been enough for me to issue a thunderstorm warning at 1855z.

Slide 2: 1858Z HSDA shows large hail for the 1st time.

Slide 3: 1902Z MESH indicates 1″ hail for the 1st time.

Slide 4: 1918Z The -20C level gets a 60dbz return for the 1st time.

Summary Verification: Our 1st quarter size severe hail was reported at 1923Z with the first Golf ball size hail report at 2004Z. There was lead time no matter, which method or combination of methods would have been used on warning for this storm. The MRMS products did offer a quicker diagnostic overview of the storm than having to look at multiple height scans as we commonly do with the Donovan method.

Wesely