SWODY1
SPC AC 291231
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0631 AM CST TUE DEC 29 2009
VALID 291300Z - 301200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
PROGRESSIVE PATTERN WILL CONTINUE...WITH DEEP TROUGH OVER QUEBEC/NEW
ENG PIVOTING NE TO THE CANADIAN MARITIMES AS COMPLEX UPSTREAM TROUGH
OVER THE WRN U.S./NRN MEXICO CONTINUES E INTO THE PLNS/MS VLY.
ARCTIC OR POLAR AIR WILL CONTINUE TO PREVAIL OVER MOST AREAS AT LWR
LVLS...LIMITING THE POTENTIAL FOR DEEP CONVECTION.
...PAC NW CST...
FAIRLY POTENT UPR IMPULSE NOW NEAR 44N/130W SHOULD CONTINUE ESE TO
THE ORE CST BY EVE...HELPING TO MAINTAIN A LARGER SCALE TROUGH IN
THE WEST. SCTD TSTMS MAY ACCOMPANY THE SYSTEM AS MID LVL CAA AND
STRENGTHENING ONSHORE FLOW DESTABILIZE REGION THROUGH EARLY WED.
SMALL HAIL ALSO MAY OCCUR.
...SRN PLNS...
LIGHT WAA PRECIPITATION WILL OVERSPREAD THE SRN HALF OF THE PLNS AND
OZARKS THIS PERIOD...IN CONJUNCTION WITH LEAD PART OF LARGER SCALE
WRN STATES TROUGH. DEGREE OF ELEVATED INSTABILITY LIKELY WILL
REMAIN INSUFFICIENT FOR THUNDER.
..CORFIDI.. 12/29/2009
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