Mesoscale Discussion 1733
   NWS Storm Prediction Center Norman OK
   0559 PM CDT Sun Sep 12 2021

   Areas affected...far northern Utah...southeast Idaho...and western
   Wyoming.

   Concerning...Severe potential...Watch unlikely 

   Valid 122259Z - 130030Z

   Probability of Watch Issuance...5 percent

   SUMMARY...An isolated large hail and severe wind threat is expected
   through the evening.

   DISCUSSION...An area of instability has developed ahead of a dryline
   which is currently moving across southeast Idaho and northern Utah.
   SPC mesoanalysis shows MLCAPE around 250 to 500 J/kg with some low
   50s dewpoints in this region. A couple supercells have developed
   along this dryline as it moves southeast. Effective shear is
   increasing as mid-level flow strengthens from the Southwest ahead of
   the mid-level shortwave trough across the Pacific Northwest. While
   the threat should remain in a confined area, isolated large hail and
   severe winds are possible with these storms as they move eastward
   through the evening.

   ..Bentley/Grams.. 09/12/2021

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

   ATTN...WFO...RIW...SLC...PIH...

   LAT...LON   41971333 42821187 42991095 42861034 42621002 42031021
               41241149 41291281 41501342 41971333