773
FXUS01 KWBC 291950
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
349 PM EDT THU OCT 29 2009
VALID 00Z FRI OCT 30 2009 - 12Z SAT OCT 31 2009
A STRONG STORM OVER THE LOWER MISSOURI VALLEY WILL MOVE
NORTHEASTWARD INTO SOUTHERN CANADA BY FRIDAY EVENING. THE
ASSOCIATED FRONT WILL MOVE FROM THE EASTERN PLAINS TO THE
APPALACHIANS BY SATURDAY MORNING. A STRONG FLOW OF MOISTURE FROM
THE GULF OF MEXICO WILL POOL ALONG AND AHEAD OF THE BOUNDARY
PRODUCING LIGHT TO MODERATE RAIN AND THUNDERSTORMS FROM THE
CENTRAL/WESTERN GULF COAST TO THE GREAT LAKES THROUGH FRIDAY
MORNING. SOME OF THE STORMS OVER THE LOWER/MIDDLE MISSISSIPPI
VALLEY MAY BECOME SEVERE. THE AREA OF SHOWERS AND THUNDERSTORMS
WILL CONSTRICT TO ALONG THE EASTERN GULF COAST BY SATURDAY
MORNING. RAIN WILL DEVELOP OVER THE UPPER MIDWEST AND MOVE INTO
THE GREAT LAKES AND PARTS OF THE NORTHEAST AND EXTEND SOUTHWARD
ALONG THE FRONT TO THE INTERIOR CENTRAL GULF COAST REGION ON
SATURDAY.
ON THE BACK SIDE OF THE SYSTEM ... SNOW OVER THE CENTRAL ROCKIES
AND HIGH PLAINS WILL COME TO AND END BY FRIDAY MORNING. A NARROW
BAND OF SNOW WILL REMAIN ON THE NORTHWEST SIDE OF THE STORM OVER
THE UPPER MIDWEST THROUGH SATURDAY. TEMPERATURES FROM THE
SOUTHWEST TO THE CENTRAL ROCKIES AND AS FAR EAST AS THE LOWER
MISSISSIPPI VALLEY WILL BE BELOW AVERAGE DURING THE NEXT TWO DAYS.
TWO STORMS WILL MOVE OVER THE NORTHWEST WITH THE FIRST STORM
TRANSITING THE AREA THURSDAY NIGHT INTO FRIDAY MORNING AND THE
SECOND STRONGER STORM WILL COME ONSHORE ON SATURDAY. THE SYSTEMS
WILL PRODUCE RAIN OVER PARTS OF THE PACIFIC NORTHWEST AND SNOW
OVER THE HIGHER ELEVATION OF THE NORTHERN ROCKIES/INTERMOUNTAIN
REGION. WARMER TEMPERATURES WILL MOVE IN OVER THE NORTHERN
ROCKIES/INTERMOUNTAIN REGION BY SATURDAY TURNING THE SNOW INTO
RAIN.
ZIEGENFELDER
GRAPHIC AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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