796 FXUS01 KWBC 092008 PMDSPD SHORT RANGE FORECAST DISCUSSION NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD 307 PM EST TUE FEB 09 2010 VALID 00Z WED FEB 10 2010 - 00Z FRI FEB 12 2010 A LARGE STORM SYSTEM IN THE MIDWEST AND OHIO VALLEY WILL MOVE EASTWARD TO JUST OFF THE MID-ATLANTIC COAST BY WEDNESDAY MORNING. THE SYSTEM WILL PRODUCE MODERATE TO HEAVY SNOW OVER THE OHIO VALLEY...MID-ATLANTIC/CENTRAL APPALACHIANS TONIGHT...MOVING NORTHEASTWARD TO THE SOUTHERN COAST OF NEW ENGLAND BY WEDNESDAY EVENING. THE SOUTHERN PORTION OF THE SYSTEM AND ITS COLD FRONT WILL BRING MODERATE TO HEAVY RAIN ACROSS THE SOUTHEAST/SOUTHERN MID-ATLANTIC TONIGHT WITH MUCH COLDER AIR SPREADING SOUTHWARD ACROSS THE SOUTHEAST...GULF COAST AND FLORIDA FOR WEDNESDAY NIGHT AND THURSDAY. TEMPERATURE WILL BE 10-15 DEGREES BELOW NORMAL BEHIND THE COLD FRONT OVER THE NEXT 2 DAYS. OVER THE CENTRAL US...A COLD BUT DRY CANADIAN AIRMASS AND HIGH PRESSURE WILL DOMINATE THE WEATHER PATTERN. DAY TIME TEMPERATURES ARE EXPECTED TO BE A GOOD 10-15 DEGREES BELOW NORMAL THROUGH THURSDAY AFTERNOON. OUT WEST...A SOUTHERN SYSTEM WILL MIGRATE THROUGH CENTRAL AND SOUTHERN CALIFORNIA TONIGHT...THEN MOVE ACROSS THE DESERT SOUTHWEST AND NORTHERN MEXICO ON THURSDAY. BY THURSDAY NIGHT...PACIFIC MOISTURE WILL BE SPREADING INTO PORTIONS OF WEST TEXAS. VALLEY RAINS AND MOUNTAIN SNOWS WILL BE THE PREVAILING WEATHER CONDITIONS ACROSS MUCH OF THE SOUTHWEST THE NEXT TWO DAYS. ACROSS THE PACIFIC NORTHWEST...THE STRONG RIDGE THAT HAS KEPT MUCH OF THE REGION IN DRY CONDITIONS OF LATE WILL GIVE WAY TO A SERIES OF WARMER AND WETTER SYSTEMS MOVING INTO THE EASTERN GULF OF ALASKA AND SOUTHWEST CANADA. BEGINNING WEDNESDAY AFTERNOON...A WEAK WARM FRONT BRUSHES THE WASHINGTON COAST...WITH A SECOND...BROADER WARM FRONT BRINGING MODERATE RAINFALL TO THE COASTAL SECTIONS OF WASHINGTON AND NORTHERN OREGON BY THURSDAY MORNING. THIS SYSTEM AND ITS COLD FRONT WILL SPREAD LIGHT PRECIPITATION INLAND ACROSS OREGON AND PORTIONS OF NORTHERN CALIFORNIA BY THURSDAY NIGHT. VOJTESAK GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV $$