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Mesoscale Discussion 1954
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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

   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 for graphic product...


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

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