SPC AC 220731
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0231 AM CDT WED OCT 22 2003
VALID 231200Z - 241200Z.
...NO TSTM AREAS FORECAST...
...SYNOPSIS...
A MID LEVEL SHORTWAVE TROUGH OFF THE PAC NW COAST EARLY THIS MORNING
WILL MOVE OVER WA/ORE BY TONIGHT...AND CONTINUE E/ESEWD OVER MT TO
THE NRN HIGH PLAINS BY LATE IN THE PERIOD. THIS SHORTWAVE TROUGH
WILL BEGIN TO AMPLIFY LATE IN THE PERIOD WHILE APPROACHING THE
PLAINS...WHILE THE DEEP DOWNSTREAM TROUGH OVER THE ERN STATES BEGINS
TO PROGRESS EWD. A SURFACE LOW IS FORECAST TO MOVE EWD OVER THE
CANADIAN PRAIRIE PROVINCES AND A TRAILING COLD FRONT WILL MOVE
ACROSS THE NRN ROCKIES AREA TOMORROW. ISOLATED LIGHTNING STRIKES
MAY ACCOMPANY THE FRONT ACROSS THE W/NW MT AREA...BUT THE
THUNDERSTORM THREAT WILL BE LIMITED BY WEAK INSTABILITY. FARTHER SE
ON THE PLAINS...LEE CYCLOGENESIS ACROSS THE CENTRAL HIGH PLAINS WILL
INDUCE SLY LOW-LEVEL FLOW FROM THE SRN TO CENTRAL PLAINS.
HOWEVER...LOW-LEVEL TRAJECTORIES WILL STILL BE ORIGINATING WITHIN
THE DRY ANTECEDENT AIR MASS...THUS THUNDERSTORMS ARE NOT EXPECTED IN
THE CENTRAL PLAINS AREA UNTIL AFTER DAY 2.
..THOMPSON.. 10/22/2003
...NOTICE...
FOR USERS DECODING THE POINTS PARAGRAPH HEREIN...LATITUDE AND
LONGITUDE POINTS FOR THE CATEGORICAL AND PROBABILISTIC OUTLOOK
GRAPHICS ALSO ARE LOCATED IN A SEPARATE PRODUCT UNDER THE WMO
HEADINGS WUUS01 PTSDY1...WUUS02 PTSDY2...AND WUUS03 PTSDY3. THE
INCLUSION OF POINTS IN THIS PRODUCT WILL EVENTUALLY BE DISCONTINUED.
NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED FOR 1730Z
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