522
FXUS01 KWBC 020857
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
456 AM EDT THU OCT 02 2008
VALID 12Z THU OCT 02 2008 - 00Z SAT OCT 04 2008
A PAIR OF PACIFIC SYSTEMS WILL BRING AN END TO THE WARM WEATHER
WHICH HAS BEEN IN PLACE ACROSS THE WEST COAST. THE FIRST OF THESE
DISTURBANCES IS CURRENTLY MOVING ONSHORE BRINGING INCREASED CLOUD
COVER AND WIDESPREAD SHOWERS ACROSS THE PACIFIC NORTHWEST. MUCH OF
THE PRECIPITATION ACTIVITY WILL BE ON THE LIGHT SIDE AS THE SYSTEM
WILL DISSIPATE UPON CROSSING THE ELEVATED TERRAIN. AFTER THE
ENERGY MOVES INTO THE INTERMOUNTAIN WEST...COOLER AIR WILL FILL IN
ACROSS THE PACIFIC NORTHWEST DRAWING TEMPERATURES DOWN INTO THE
UPPER 50S TO LOWER 60S ON FRIDAY. BY FRIDAY EVENING...AN EVEN MORE
POWERFUL WEATHER SYSTEM WILL DRIVE INTO THE WEST COAST CAUSING
WIDESPREAD RAINS TO FALL FROM CENTRAL CALIFORNIA NORTHWARD ACROSS
THE CANADIAN BORDER AND INTO WESTERN BRITISH COLUMBIA. THE COOLER
AIR ASSOCIATED WITH THIS SECOND PACIFIC SYSTEM WILL REACH AS FAR
SOUTH AS THE DESERT SOUTHWEST WHICH WILL DROP DAYTIME TEMPERATURES
FROM NEAR THE 100 DEGREE MARK TO THE MID TO UPPER 80S BY THE START
OF THE WEEKEND.
A LARGE CLOSED UPPER-LEVEL LOW POSITIONED OVER THE GREAT LAKES
WILL CONTINUE TO SPIN NUMEROUS DISTURBANCES ACROSS THE NORTHERN
TIER STATES WHICH WILL CARRY REINFORCING SHOTS OF COLD AIR TO THE
REGION. UNDERNEATH THE INFLUENCE OF THIS UPPER TROUGH...CLOUDY
CONDITIONS AND SCATTERED SHOWER ACTIVITY WILL BE THE RULE ACROSS
AN AREA STRETCHING FROM THE GREAT LAKES THROUGH THE OHIO VALLEY
AND INTO THE NORTHEASTERN U.S. THE COMBINATION OF THE OVERCAST
SKIES AND COOL AIR MOVING IN FROM THE CANADA WILL BRING HIGH
TEMPERATURES DOWN INTO THE 60S ACROSS THE MID-ATLANTIC STATES AND
THE MID TO UPPER 50S ACROSS THE INTERIOR NORTHEAST OVER THE NEXT
COUPLE OF DAYS.
IN BETWEEN THESE WEATHER SYSTEMS IS A DOMINANT RIDGE OF HIGH
PRESSURE OVER THE INTERMOUNTAIN WEST. THE UPPER RIDGE SHOULD HOLD
STRONG ON THURSDAY AND FRIDAY BEFORE SLOWLY BREAKING DOWN AND
MOVING EASTWARD BY THE LATTER PART OF THE WEEKEND. WARM CONDITIONS
WILL PERSIST ACROSS THE MOUNTAINOUS WEST WITH MANY AREAS REACHING
THE 80S ON THURSDAY UNDERNEATH MOSTLY SUNNY SKIES. BY
FRIDAY...INCREASING CLOUD COVER WILL BEGIN TO HIT THE REGION AS
THE ENERGY FROM THE PACIFIC BEGINS TO MOVE INTO THE CENTRAL
INTERMOUNTAIN WEST. THIS WILL BRING TEMPERATURES DOWN INTO THE 70S
BEFORE FALLING SIGNIFICANTLY LOWER BY THE WEEKEND.
RUBIN-OSTER
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