SPC MD 2052



MD 2052 CONCERNING SEVERE THUNDERSTORM WATCH 671… FOR EAST-CENTRAL IOWA…SOUTHERN WISCONSIN…AND NORTHERN ILLINOIS

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Mesoscale Discussion 2052
NWS Storm Prediction Center Norman OK
0854 PM CDT Tue Oct 01 2019

Areas affected...east-central Iowa...southern Wisconsin...and
northern Illinois

Concerning...Severe Thunderstorm Watch 671...

Valid 020154Z - 020330Z

The severe weather threat for Severe Thunderstorm Watch 671
continues.

SUMMARY...The severe threat continues across remaining portions of
WW 671.

DISCUSSION...Storms have grown upscale into linear segments over the
past hour or so.  With the onset of nocturnal boundary layer
cooling, instability should wane some - which should lead to a
gradual lessening of the severe threat across remaining portions of
the WW area, though low to mid-70s F dewpoints should allow for
storms to remain near-surface-based for at least the next hour or
two.  The damaging-wind threat should be maximized near
linear/bowing segments and with any isolated cells that can persist
ahead of the line.  North and west of the line, the combination of
rain-cooled air and cold advection should limit instability enough
such that the severe threat will end before the scheduled expiration
of WW 671.

..Cook.. 10/02/2019

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

ATTN...WFO...LOT...MKX...DVN...ARX...DMX...

LAT...LON   42169206 42509143 42989047 43548948 43668849 43378806
            42748831 42228875 41908951 41599100 41229158 41189218
            41399237 42169206 

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