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Storm Prediction Center Mesoscale Discussion 154

Published Date and Time: 2026-03-06 19:39:00



Mesoscale Discussion 154
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   Mesoscale Discussion 0154
   NWS Storm Prediction Center Norman OK
   0637 PM CST Fri Mar 06 2026

   Areas affected...Northern Indiana into southern Michigan

   Concerning...Severe Thunderstorm Watch 17...

   Valid 070037Z - 070230Z

   The severe weather threat for Severe Thunderstorm Watch 17
   continues.

   SUMMARY...A squall line will continue east across northern Indiana
   and southern lower Michigan for the next couple of hours before
   gradually weakening. Damaging gusts remain the primary threat.

   DISCUSSION...Latest MRMS and GOES IR imagery continue to show new
   updraft development within a squall line draped from southern MI
   into northwest IN, and local radar imagery continues to show a few
   bowing segments within the line. Regional VWPs and latest RAP
   mesoanalysis continues to show a strongly sheared environment in
   place across the region with 0-3 km BWD values on the order of 30-40
   knots and 40-50 knots winds within the lowest kilometer. This
   kinematic environment will continue to support the potential for
   organized/bowing segments within the line with an attendant threat
   for severe/damaging winds - especially with any
   meridionally-oriented segments. With time, a gradual weakening trend
   is expected as the squall line outpaces the axis of better
   surface-based buoyancy draped from western IL into northern IN. The
   onset of nocturnal cooling will further contribute to an overall
   reduction in convective intensity in the coming hours.

   ..Moore.. 03/07/2026

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

   ATTN...WFO...DTX...IWX...GRR...IND...LOT...

   LAT...LON   40888772 41418696 41968605 42408539 43018453 42998411
               42818366 42548353 42258366 41478464 41108518 40858569
               40688634 40668681 40658709 40678735 40698751 40758766
               40888772 

   MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH
   MOST PROBABLE PEAK WIND GUST...UP TO 60 MPH
   MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN


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