Mesoscale Discussion 1484
   NWS Storm Prediction Center Norman OK
   0715 PM CDT Mon Jul 15 2019

   Areas affected...Portions of southeastern MN into western/central WI

   Concerning...Severe Thunderstorm Watch 509...

   Valid 160015Z - 160145Z

   The severe weather threat for Severe Thunderstorm Watch 509
   continues.

   SUMMARY...Primarily an isolated strong to damaging wind threat
   continues across remaining valid portions of Severe Thunderstorm
   Watch 509. Downstream watch issuance into more of western/central WI
   and southeastern MN is not expected this evening.

   DISCUSSION...Over the past couple of hours convection has
   consolidated into a line along a pre-frontal surface trough
   extending from northwestern WI into parts of southeastern MN. Given
   the linear mode, isolated strong to damaging outflow winds should be
   the main threat through the remainder of the evening. However, a
   brief tornado cannot be ruled out in the short term along the
   southern flank of the line, where a recent rotational velocity
   couplet around 40 kt was observed in Scott County MN before
   weakening. Instability rapidly decreases into central WI and far
   southeastern MN, where convective overturning from earlier
   thunderstorms has generally stabilized the low levels. Current
   expectations are for the ongoing line of storms to weaken as it
   progresses southeastward into WI and far southeastern MN through the
   evening. Therefore, an additional Severe Thunderstorm Watch into
   more of western/central WI and far southeastern MN is not
   anticipated at this time.

   ..Gleason.. 07/16/2019

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

   ATTN...WFO...GRB...DLH...ARX...MPX...

   LAT...LON   44159474 44869453 45159419 45099287 45939181 46459113
               46559057 46469030 46309012 46238981 45878930 44318998
               43549129 43549417 44159474