MESOSCALE DISCUSSION 1884
   NWS STORM PREDICTION CENTER NORMAN OK
   0727 PM CDT TUE SEP 04 2012
   
   AREAS AFFECTED...SERN SD...NERN NEB...NWRN IA AND SWRN MN
   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 
   
   VALID 050027Z - 050130Z
   
   PROBABILITY OF WATCH ISSUANCE...80 PERCENT
   
   SUMMARY...STORMS MAY CONTINUE TO POSE A THREAT FOR ISOLATED DAMAGING
   WIND AND LARGE HAIL AS THEY DEVELOP THROUGH THE REMAINDER OF SERN SD
   AND NE NEB...EVENTUALLY INTO SWRN MN AND NWRN IA. A SEVERE
   THUNDERSTORM WATCH MAY BE NEEDED SOON.
   
   DISCUSSION...STORMS THAT DEVELOPED ALONG DRYLINE PERSIST ACROSS SERN
   SD INTO NERN NEB. WV IMAGERY SHOWS A LEAD IMPULSE DROPPING SEWD
   THROUGH SD...AND VWP DATA INDICATES THERE HAS BEEN SOME RESPONSE TO
   THE LOW LEVEL WIND PROFILES WITH SIOUX FALLS VWP NOW INDICATING A
   MORE WELL DEFINED WARM ADVECTION PROFILE. AS SWLY LLJ
   STRENGTHENS...STORMS ARE EXPECTED TO CONTINUE DEVELOPING EWD ALONG
   INSTABILITY GRADIENT THROUGH SERN SD...NWRN IA AND SWRN MN. SHEAR
   PROFILES ARE SUFFICIENT FOR A FEW STORMS TO DEVELOP SUPERCELL
   STRUCTURES...BUT SOME UPSCALE GROWTH INTO LINES AND CLUSTERS MAY
   ALSO OCCUR. GIVEN THE LARGE TEMPERATURE-DEWPOINT SPREADS...PRIMARY
   THREATS WILL BE DAMAGING WIND AND LARGE HAIL.
   
   ..DIAL/THOMPSON.. 09/05/2012
   
   
   ATTN...WFO...MPX...DMX...FSD...
   
   LAT...LON   42389649 43449749 44379730 44349478 42689472 42389649