DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 251732
SWODY2
SPC AC 251730

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1230 PM CDT WED SEP 25 2013

VALID 261200Z - 271200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...

BROAD UPPER TROUGH WILL CONTINUE TO EVOLVE ACROSS THE WRN STATES ON
THURSDAY. SIGNIFICANT SHORTWAVE TROUGH EMBEDDED WITHIN THIS FEATURE
WILL EJECT NEWD THROUGH THE NRN HIGH PLAINS AND SRN PARTS OF THE
CNTRL CANADIAN PROVINCES EARLY IN PERIOD. ANOTHER VORTICITY MAXIMUM
CURRENTLY OFF THE OREGON COAST WILL DROP INTO BASE OF THE TROUGH
OVER THE GREAT BASIN AREA DURING THE DAY. UPPER RIDGE AXIS WILL
SHIFT SLOWLY EWD THROUGH THE LOWER-MID MS AND OH VALLEYS AND GREAT
LAKES WHILE UPPER LOW NOW OVER THE ERN U.S. FINALLY MOVES OFF THE
ATLANTIC SEABOARD. SFC LOW PRESSURE AREA WILL ACCOMPANY THE WAVE
EJECTING INTO SCNTRL CANADA EARLY THURSDAY WITH TRAILING COLD FRONT
ADVANCING THROUGH THE NRN PLAINS. BY THURSDAY EVENING THIS BOUNDARY
IS FORECAST TO EXTEND FROM NWRN MN SWWD THROUGH NWRN NEB INTO THE
CNTRL ROCKIES.

...CNTRL PLAINS AND UPPER MS VALLEY AREA...

A STRENGTHENING LLJ AND FRONTOGENETIC FORCING WILL LIKELY PROMOTE
THE DEVELOPMENT OF THUNDERSTORMS FROM NRN NEB INTO ERN ND AND SWRN
MN LATER THURSDAY NIGHT. WHILE LOW-LEVEL MOISTURE WILL BE LIMITED
AND STORMS WILL BE ELEVATED...ACTIVITY WILL DEVELOP ALONG ERN FRINGE
OF STEEP /7.5-8C PER KM/ LAPSE RATES SUPPORTING UP TO 500 J/KG
MUCAPE. ISOLATED MARGINALLY SEVERE HAIL MIGHT ACCOMPANY SOME OF THE
STORMS.

..DIAL.. 09/25/2013

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