Mesoscale Discussion 0487
   NWS Storm Prediction Center Norman OK
   0531 PM CDT Tue Apr 28 2020

   Areas affected...South-central South Dakota into central Nebraska

   Concerning...Severe potential...Watch unlikely 

   Valid 282231Z - 290030Z

   Probability of Watch Issuance...5 percent

   SUMMARY...A few strong to severe (55-65 mph) gusts are possible this
   afternoon with low-topped convection moving from central South
   Dakota into central and eastern Nebraska. This threat will remain
   isolated and cease after sunset. No WW is expected.

   DISCUSSION...Strong heating behind a cold front has allow low-level
   lapse rates to steepen to near 9-9.5 C/km in some portions of
   western and central South Dakota. Farther south into Nebraska,
   low-level cloud cover has hindered heating somewhat. As skies clear,
   however, low-level lapse rate of 8-9 C/km are possible. Severe wind
   gusts have already been reported with low-topped convection moving
   southeastward through South Dakota. Strong gradient winds will be
   enhanced by convectively-induced downward momentum transport of
   strong mid-level winds. A few strong gusts of 55-65 mph are
   possible. Activity should rapidly decrease after sunset. Given cloud
   cover moving into eastern Nebraska, near Omaha, the eastward extent
   of this threat is less certain. No WW is expected this afternoon.

   ..Wendt/Edwards.. 04/28/2020

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

   ATTN...WFO...FSD...OAX...ABR...GID...LBF...UNR...

   LAT...LON   43480148 44570136 45120014 44389850 42679740 41569724
               40629751 40289837 40179925 40800021 43480148