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Mesoscale Discussion 189
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MD 189 graphic

   Mesoscale Discussion 0189
   NWS Storm Prediction Center Norman OK
   0125 PM CST Mon Mar 04 2024

   Areas affected...Northeast Missouri to northern Illinois and
   southern Wisconsin

   Concerning...Severe potential...Watch unlikely 

   Valid 041925Z - 042130Z

   Probability of Watch Issuance...20 percent

   SUMMARY...Additional thunderstorm development is expected along and
   just ahead of cold front from southern Wisconsin into eastern Iowa,
   northwest Illinois, and northeast Missouri in the next 1-3 hours.
   Thunderstorms will primarily pose a damaging wind and severe hail

   DISCUSSION...Gradual destabilization is ongoing across portions of
   MO/IA/IL as temperatures climb into the low to mid 70s amid broken
   cloud cover and continued northward moisture return. Recent
   temperature/dewpoint observations are higher than anticipated by
   recent guidance by as much as a few degrees, suggesting that MLCIN
   is likely eroding slightly faster than depicted by guidance and/or
   mesoanalyses. Satellite imagery bears this out with slowly deepening
   cumulus developing from northeast MO to western IL and a recent
   intensification of previously anemic convection along the IA/IL
   border. High-res guidance suggests additional convection is likely
   in the next couple of hours along and ahead of the cold front, but
   the aforementioned observed trends hint at the potential for earlier

   Regardless of precise timing, initially semi-discrete cells should
   undergo upscale growth owing to strengthening forcing for ascent and
   undercutting nature of the front, as well as mean storm motion and
   deep-layer shear vectors oriented northeast along the boundary.
   Consequently, an initial hail threat should transition to a damaging
   wind threat threat heading into the late afternoon hours and with
   eastward extent. Poor boundary-normal deep-layer shear should limit
   overall storm organization/intensity. A low-end tornado threat may
   materialize across northern IL where backed low-level flow in the
   vicinity of the warm front may locally enhance effective SRH.
   However, this may be conditional on realizing at least a
   semi-discrete storm mode. Additionally, the northward extent of the
   warm sector into southern WI is uncertain given extensive cloud
   cover and falling temperatures north of the surface warm front.
   Given these concerns, watch issuance is not anticipated.

   ..Moore/Hart.. 03/04/2024

   ...Please see for graphic product...


   LAT...LON   41818741 41548752 41368794 40249048 40019105 39789180
               39709265 39829310 40159337 40459329 40749300 40959236
               41109211 41439171 43298995 43498966 43478876 42918777
               42418756 41818741 

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