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SPC MD 1954

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MD 1954 CONCERNING SEVERE THUNDERSTORM WATCH 643...644... FOR SOUTHERN MINNESOTA THROUGH NORTHERN IOWA
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Mesoscale Discussion 1954
NWS Storm Prediction Center Norman OK
0209 AM CDT Wed Sep 11 2019

Areas affected...southern Minnesota through northern Iowa

Concerning...Severe Thunderstorm Watch 643...644...

Valid 110709Z - 110845Z

The severe weather threat for Severe Thunderstorm Watch 643, 644
continues.

SUMMARY...Line of storms will continue to pose a risk for damaging
wind as it continues through southern Minnesota and northern IA into
the early morning hours. As needed, WW 644 can be expanded another
row or two of counties farther south to account for intensification
along the southern half of the line.

DISCUSSION...Line of storms extending from southwest MN through
northwest IA is moving east at 30-35 kt. A quasi-stationary front
extends across southern MN, and the atmosphere along and south of
this boundary remains moderately unstable with up to 2500 J/kg
MUCAPE. A 40 kt southerly low-level jet will maintain influx of
higher theta-e air as well as augment convergence along gust front,
supporting forward propagation next few hours. Some strengthening
has recently been observed along portion of the line moving into
northwest IA. The squall line remains organized with a comma-head
circulation on northern end along with a rear inflow jet supporting
a continued threat for damaging wind next couple hours.

..Dial.. 09/11/2019

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

ATTN...WFO...ARX...MPX...DMX...FSD...

LAT...LON   42889530 43279498 43689471 44039448 44139334 44089267
            43559247 43249252 42929294 42719425 42289539 42429588
            42889530 

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