SWODY1
SPC AC 290431
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1131 PM CDT TUE OCT 28 2008
VALID 291200Z - 301200Z
...NO TSTM AREAS FORECAST...
...SYNOPSIS AND FORECAST...
CLOSED UPPER LOW...INITIALLY CENTERED OVER SRN QUEBEC...WILL EVOLVE
INTO AN OPEN WAVE AND TRACK NWD...WHILE THE LAST IN A SERIES OF
SHORT WAVE TROUGHS AMPLIFIES SEWD FROM THE LOWER GREAT LAKES TO THE
MID ATLANTIC REGION. THE PARENT LONG WAVE TROUGH IS EXPECTED TO
SHIFT EWD OFF THE NRN/MID ATLANTIC COAST BY 12Z THU. UPSTREAM RIDGE
IS FORECAST TO FLATTEN WITH HEIGHTS BUILDING ACROSS THE GREAT LAKES
TO TN VALLEY...AS A SHORT WAVE TROUGH TRANSLATES EWD INTO CENTRAL
CANADA...AND A WEAKER TROUGH MOVES THROUGH THE CENTRAL ROCKIES.
ASCENT AND COLD MID LEVEL TEMPERATURES SPREADING SEWD WITH THE LOWER
GREAT LAKES TROUGH THIS MORNING ATOP WARM LAKE SURFACE TEMPERATURES
MAY PRODUCE A FEW LIGHTNING STRIKES ALONG DOWNWIND SIDE OF LAKE
ERIE. HOWEVER...COVERAGE IS NOT EXPECTED TO BE HIGH ENOUGH TO
WARRANT THE INCLUSION OF A GENERAL TSTM AREA. ELSEWHERE...A
CONTINENTAL POLAR AIR MASS COVERING MOST OF THE COUNTRY WILL LIMIT
THE RISK OF DEEP MOIST CONVECTION.
..PETERS/JEWELL.. 10/29/2008
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