DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 211700
SWODY2
SPC AC 211659

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1059 AM CST MON JAN 21 2013

VALID 221200Z - 231200Z

...NO TSTM AREAS FORECAST...

...SYNOPSIS...
ALTHOUGH THE SOUTHWARD DISPLACED CORE OF A POLAR VORTEX MAY SHIFT
EASTWARD INTO AND THROUGH THE CANADIAN MARITIMES...BROAD AMPLIFIED
UPPER TROUGHING EAST OF THE NORTHERN/CENTRAL ROCKIES INTO THE
WESTERN ATLANTIC IS EXPECTED TO LINGER...AND REMAIN THE MOST
PROMINENT FEATURE IMPACTING THE U.S. DURING THIS FORECAST PERIOD. A
SIGNIFICANT UPSTREAM SHORT WAVE TROUGH...WITHIN THE NORTHERN BRANCH
OF A SPLIT FLOW...MAY APPROACH THE PACIFIC NORTHWEST LATE IN THE
PERIOD...AND BEGIN BREAKING DOWN SHARP UPPER RIDGING ACROSS THE
PACIFIC COAST STATES. AT THE SAME...ANOTHER IMPULSE...WITHIN THE
WEAKER SOUTHERN BRANCH...APPEARS LIKELY TO DIG ACROSS THE NORTHERN
MEXICAN PLATEAU. HOWEVER...GENERALLY STABLE CONDITIONS ...AT LEAST
TO DEEP CONVECTIVE DEVELOPMENT...ARE EXPECTED TO PERSIST ACROSS THE
U.S...WITH PROBABILITIES FOR THUNDERSTORM ACTIVITY REMAINING LESS
THAN 10 PERCENT.

..KERR.. 01/21/2013

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