Prob-Severe: Severe outflow wind report.

Prob-Severe: Severe outflow wind report.

Main Points:

• Spotter reported outflow wind of 67 mph with a cell 1957z.
• ProbSevere showed probabilities of 0% throughout its track.  
• GLM data (not shown) had an increase in activity but nothing that seemed significant compared to earlier in the day. Nothing eye-catching that is. Also, this storm did not produce subsequent CG strikes. 
• Radar radial velocity was the only key piece of information that would allow you to issue a warning on this cell.

Cell of interest was starting to be tracked by Prob Severe about 18:26z through 19:57z. During this time frame ProbSevere kept probabilities at 0% for all elements.  At about 19:40z, an outflow became evident on radial velocity with two maximum of about 45 to 50 dBz (below). The northern max would go on to produce a spotter report of 67mph with tree branches down.

At 1957z (below) the time of the spotter report, the radial velocity displayed an outbound velocity of about 60 knots, while the max was still displaced to the south from the ProbSevere boundary which still showed 0% probs. --Tahoe