DAY3SVR: Nws Storm Prediction Center Norman Ok

ACUS03 KWNS 300827
SWODY3
SPC AC 300825

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0225 AM CST FRI NOV 30 2012

VALID 021200Z - 031200Z

...NO TSTM AREAS FORECAST...

...SYNOPSIS...
SLIGHT AMPLIFICATION OF THE FLOW FIELD ALOFT IS FORECAST THIS
PERIOD...AS A STRONG BUT LOW-AMPLITUDE SHORT-WAVE TROUGH -- MOVING
ONSHORE AT THE START OF THE PERIOD -- SHIFTS ENEWD ACROSS THE PAC NW
AND NRN INTERMOUNTAIN REGION WITH TIME...REACHING THE NRN PLAINS
LATE IN THE PERIOD. AS THIS OCCURS...BROADLY/WEAKLY CYCLONIC FLOW
WILL EVOLVE ON THE LARGER SCALE OVER THE WRN HALF OF THE
COUNTRY...WITH WEAK DOWNSTREAM RIDGING OCCURRING IN CONJUNCTION.

THOUGH PRECIPITATION WILL ACCOMPANY THIS SYSTEM AS IT MOVES ACROSS
THE NRN INTERMOUNTAIN REGION...LACK OF INSTABILITY ALOFT SHOULD
PRECLUDE ANY APPRECIABLE THUNDER THREAT.

AS THIS UPPER SYSTEM MOVES TOWARD THE NRN PLAINS...EXPECT A SURFACE
LOW TO TRAVERSE U.S./CANADA BORDER WHILE A TRAILING COLD FRONT DROPS
SEWD ACROSS THE PLAINS THROUGH THE SECOND HALF OF THE PERIOD.
HOWEVER...DESPITE SLY FLOW AT LOW LEVELS...ANY MOISTURE RETURN AHEAD
OF THE FRONT SHOULD PROVE INSUFFICIENT FOR THE DEVELOPMENT OF AMPLE
WARM-SECTOR AIRMASS DESTABILIZATION TO SUPPORT DEEP MOIST
CONVECTION.

..GOSS.. 11/30/2012

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