SPC MD 1496



MD 1496 CONCERNING SEVERE THUNDERSTORM WATCH 439… FOR WESTERN WI…SOUTHEAST MN…NORTHEAST IA

MD 1496 Image


Mesoscale Discussion 1496
NWS Storm Prediction Center Norman OK
1021 PM CDT Fri Aug 14 2020

Areas affected...Western WI...Southeast MN...Northeast IA

Concerning...Severe Thunderstorm Watch 439...

Valid 150321Z - 150415Z

The severe weather threat for Severe Thunderstorm Watch 439
continues.

SUMMARY...Squall line should continue weakening over the upper
Mississippi Valley.

DISCUSSION...Squall line that developed earlier this afternoon ahead
of a strong short-wave trough has progressed into western
WI-southeast MN-northeast IA. This line of storms has gradually
weakened over the last few hours, primarily due to convection
encountering increasingly more stable air. As the short wave lifts
into western ON, large-scale forcing for maintaining this line will
gradually lessen. Even so, east-southeast propagation should
continue for the next few hours. Isolated damaging winds remain
possible, though most wind speeds should be less than 50kt.

..Darrow.. 08/15/2020

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...DLH...ARX...MPX...DMX...

LAT...LON   43509329 45929088 45449034 43229241 43509329 

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