SPC AC 171935
   
   DAY 1 CONVECTIVE OUTLOOK CORR 1
   NWS STORM PREDICTION CENTER NORMAN OK
   0235 PM CDT THU MAY 17 2012
   
   VALID 172000Z - 181200Z
   
   ...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF SERN CO AND
   PORTIONS OF ADJACENT WRN KS/THE OK PANHANDLE...
   
   CORRECTED TEXT
   
   ...SERN CO/WRN KS/OK PANHANDLE VICINITY...
   FEW CHANGES HAVE BEEN MADE TO THE FORECAST THIS PERIOD...WITH
   MARGINAL SEVERE THREAT AREAS IN BOTH THE SERN U.S. AND THE NRN
   INTERMOUNTAIN REGION/NRN HIGH PLAINS EVOLVING AS EXPECTED.
   
   HAVE OPTED HOWEVER TO UPGRADE A SMALL PORTION OF THE THREAT AREA
   ACROSS THE CENTRAL HIGH PLAINS TO SLIGHT RISK...WHERE A VERY
   DRY/DEEP BOUNDARY LAYER TOPPED BY MARGINAL CAPE IS EVIDENT.  WHILE
   THIS ENVIRONMENT EXISTS ACROSS A LARGER AREA OF THE HIGH PLAINS
   REGION...FAIRLY STRONG CYCLONIC CIRCULATION CENTER ALOFT -- EVIDENT
   IN SATELLITE/RADAR LOOPS -- MAY YIELD A GREATER CONCENTRATION OF
   STORMS ACROSS SERN CO/SWRN KS AND VICINITY THAN EARLIER EXPECTED. 
   WITH A COUPLE OF FAIRLY ROBUST STORMS ALREADY IN PROGRESS ACROSS
   SERN CO...SUPPORTING THIS POTENTIAL...WILL ADD 15% WIND CONTOUR.
   
   FOR ADDITIONAL SHORT-TERM FORECAST INFORMATION...PLEASE REFER TO
   RECENTLY ISSUED SPC SWOMCD #0828.
   
   ..GOSS.. 05/17/2012
   
   .PREV DISCUSSION... /ISSUED 1131 AM CDT THU MAY 17 2012/
   
   ...CENTRAL HIGH PLAINS...
   WATER VAPOR IMAGERY SHOWS A COUPLE OF WEAK SHORTWAVE TROUGHS MOVING
   ACROSS THE WESTERN U.S.  ONE SUCH TROUGH IS NOW OVER CENTRAL CO AND
   WILL TRACK INTO THE CENTRAL HIGH PLAINS LATER TODAY.  LOW LEVEL
   MOISTURE IS LIMITED IN THIS REGION...BUT STRONG HEATING AND STEEP
   LOW/MID LEVEL LAPSE RATES ARE LIKELY TO RESULT IN SUFFICIENT
   INSTABILITY FOR THE DEVELOPMENT OF A FEW ISOLATED THUNDERSTORMS THIS
   AFTERNOON AND EARLY EVENING.  THOSE STORMS THAT FORM WILL BE VERY
   HIGH-BASED...BUT MAY BE CAPABLE OF LOCALLY GUSTY WINDS.  THE MAIN
   THREAT APPEARS TO EXTEND FROM WESTERN KS/EASTERN CO INTO THE
   NORTHERN TX PANHANDLE.
   
   ...NORTHERN ROCKIES...
   ANOTHER SHORTWAVE TROUGH IS CURRENTLY ALONG THE ORE/NORTHERN CA
   COAST.  THIS FEATURE WILL TRACK EASTWARD ACROSS THE NORTHERN GREAT
   BASIN THIS AFTERNOON...WITH LARGE SCALE FORCING OVERSPREADING PARTS
   OF ID/MT/WY.  PRESENT INDICATIONS ARE THAT SCATTERED SHOWERS AND
   THUNDERSTORMS WILL FORM OVER THE MOUNTAINS OF EASTERN ID/WESTERN WY
   AND SPREAD EAST-NORTHEASTWARD INTO MT THROUGH THE AFTERNOON AND
   EVENING.  LOCALLY GUSTY/DAMAGING WINDS AND SMALL HAIL WILL BE
   POSSIBLE IN THE STRONGER CELLS.
   
   ...SOUTHEAST STATES...
   A WEAK UPPER LOW IS PRESENT TODAY OVER SC/GA.  MOIST AND UNSTABLE
   CONDITIONS EXTEND FROM PARTS OF THE FL PENINSULA NORTHWARD INTO
   EASTERN GA/SC WHERE SCATTERED AFTERNOON THUNDERSTORMS ARE LIKELY. 
   WEAK FLOW WILL LIMIT CONVECTIVE ORGANIZATION.  SIMILAR TO
   YESTERDAY...THE STRONGER CELLS ACROSS THIS REGION WILL BE CAPABLE OF
   LOCALLY GUSTY/DAMAGING WINDS AND HAIL.
   
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