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Mesoscale Discussion 209
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   Mesoscale Discussion 0209
   NWS Storm Prediction Center Norman OK
   0224 PM CDT Wed Mar 17 2021

   Areas affected...Central AL

   Concerning...Tornado Watch 29...33...

   Valid 171924Z - 172100Z

   The severe weather threat for Tornado Watch 29, 33 continues.

   SUMMARY...A corridor more favorable for the development of strong
   tornadoes may be evolving across central AL.

   DISCUSSION...Radar imagery from BMX, GWX, and MOB continues to show
   a cluster of supercells over west-central AL. The downstream air
   mass is characterized by temperatures in the low/mid 70s and
   dewpoints in the upper 60s. As noted in the recent BMX sounding,
   this air mass is less buoyant than farther west (along the central
   MS/AL border) where this cluster initially developed. However, in
   contrast to the slightly less favorable thermodynamics, surface
   winds here are more southeasterly, veering to southerly in the
   low-levels, and then southwesterly farther aloft. This is resulting
   in considerable low-level vertical shear. Recent VAD profile from
   BMX sampled 350+ m2/s2 of 0-1 km storm-relative helicity. Given the
   already organized character of these storms, potential exists for
   the development of strong tornadoes if a more discrete nature can be

   ..Mosier.. 03/17/2021

   ...Please see for graphic product...


   LAT...LON   32938782 33178747 33038674 32158666 31978763 32298791

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