MESOSCALE DISCUSSION 1758
   NWS STORM PREDICTION CENTER NORMAN OK
   0228 AM CDT WED AUG 15 2007
   
   AREAS AFFECTED...SERN SD/FAR NERN NEB/SWRN MN/NWRN IA
   
   CONCERNING...HEAVY RAINFALL 
   
   VALID 150728Z - 150900Z
   
   LOCALIZED HEAVY RAINFALL RATES OF 1.5-2 INCHES PER HOUR WILL
   CONTINUE TO BE LIKELY ACROSS SERN SD INTO NWRN IA/SWRN MN THROUGH
   10-11Z.
   
   SATELLITE/REGIONAL RADAR IMAGERY INDICATED CLOUD TOPS CONTINUED TO
   COOL ACROSS SRN-SERN SD/FAR NERN NEB WITH A MORE ORGANIZED MCS
   ACROSS THIS REGION WHICH HAS AN MCV LOCATED ALONG THE SD/NEB BORDER
   IN FAR SRN TRIPP COUNTY.  DEEP LAYER ASCENT AHEAD OF THIS MCV AND
   LOW LEVEL WAA ALONG NOSE OF 40 KT SWLY LLJ EXTENDING INTO NERN
   NEB/NWRN IA EXPECTED TO AID IN ADDITIONAL TSTM DEVELOPMENT THROUGH
   THE EARLY MORNING...AS IS INDICATED BY RADAR TRENDS.  AT THE
   SURFACE...A WARM FRONT EXTENDED SEWD FROM THE MCV THROUGH EAST
   CENTRAL NEB TO SRN IA...WHILE A SECOND WEAKER BOUNDARY EXTENDED EWD
   ALONG THE SD/NEB BORDER INTO FAR NRN IA.  AT THIS TIME...ASCENT
   APPEARS TO BE STRONGEST ALONG AND JUST N OF THIS LATTER BOUNDARY...
   WITH THIS TREND EXPECTED TO PERSIST FOR THE NEXT SEVERAL HOURS AS
   THE MCV MOVES ENEWD.  PRECIPITABLE WATER VALUES OF 1.75-2 INCHES
   ACROSS THIS REGION WILL SUPPORT THE EXPECTED HEAVY RAINFALL RATES.
   
   ..PETERS.. 08/15/2007
   
   
   ATTN...WFO...MPX...DMX...FSD...
   
   44009829 44269682 44259511 43539483 43129502 42949578
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