The NWS issued a Tornado Watch for much of southeastern Iowa on Saturday afternoon. Polk County (Des Moines) was initially included in the watch, but was removed after just 1 hour and 49 minutes as the storms fired east of the county. The featured chart looks at the frequency of tornado watch duration for the county. Two lines are plotted, the initial line represents the watch duration as initially issued, the final line presents what the final result for duration was (some watches/warnings can be extended in time / cancelled early). So having a 2 hour tornado watch is about a 1 in 10 frequency based on data back to 2005.

Voting:
Good = 16
Bad = 9
Abstain = 5

Tags:   warnings   nws