Saturday, November 17, 2007

DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 170642
SWODY2
SPC AC 170640

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1240 AM CST SAT NOV 17 2007

VALID 181200Z - 191200Z

..NO SVR TSTM AREAS FORECAST...

..SYNOPSIS...
UPPER FLOW PATTERN ACROSS THE BULK OF THE CONUS IS FORECAST TO
FLATTEN/DEAMPLIFY WITH TIME...AS A TROUGH REACHES THE E COAST BY THE
END OF THE PERIOD WHILE A SECOND TROUGH REMAINS W OF THE W COAST
UNTIL THE END OF THE PERIOD.

ON THE SMALLER SCALE...THE SHORT-WAVE TROUGH CROSSING THE S CENTRAL
CONUS IS EXPECTED TO SHEAR/WEAKEN WITH TIME...WHILE A SECOND FEATURE
MOVES ALONG THE S CENTRAL CANADA/N CENTRAL U.S. BORDER.

AT THE SURFACE...A RELATIVELY COOL/DRY AIRMASS WILL PREVAIL ACROSS
MOST OF THE CONUS...THOUGH A MORE MOIST/WEAKLY-UNSTABLE AIRMASS IS
EXPECTED TO LINGER ACROSS PARTS OF ERN TX AND INTO THE LOWER MS
VALLEY REGION -- INVOF WEAKENING UPPER SHORT-WAVE TROUGH. WHILE
INSTABILITY SHOULD BE SUFFICIENT TO FUEL SCATTERED SHOWERS AND
ISOLATED THUNDERSTORMS...DEGREE OF SHEAR AND INSTABILITY ANTICIPATED
SUGGEST LITTLE IF ANY SEVERE THREAT THROUGH THE PERIOD.

.GOSS.. 11/17/2007

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