529
FXUS01 KWBC 210837
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
436 AM EDT WED OCT 21 2009
VALID 12Z WED OCT 21 2009 - 00Z FRI OCT 23 2009
A CLOSED UPPER LEVEL LOW MOVING THROUGH THE SOUTHWEST THIS MORNING
WILL BE RESPONSIBLE FOR A WINTER STORM FROM THE EASTERN SLOPES OF
THE COLORADO ROCKIES INTO PORTIONS OF THE CENTRAL PLAINS. ALSO...
A WIDESPREAD HEAVY RAIN EVENT IS EXPECTED FOR THE REST OF THE
CENTRAL PLAINS DOWN INTO TEXAS THROUGH TODAY... WITH RAIN MOVING
TO THE EAST AS THE WEEK PROGRESSES.
A STRONG COLD FRONT IS CURRENTLY DIVING SOUTH THROUGH THE CENTRAL
PLAINS AND ROCKIES WHICH WILL HELP SET THE STAGE FOR A CHANGEOVER
TO SNOW FOR EASTERN COLORADO BY THIS AFTERNOON. AMPLE MOISTURE
RETURN AHEAD OF THE FRONT VIA MODERATE SOUTHERLY FLOW IN THE LOWER
LEVELS OF THE ATMOSPHERE WILL ALLOW A POTENTIAL WIDESPREAD ONE TO
TWO INCH RAINFALL FROM THE PLAINS TO THE MISSISSIPPI RIVER THROUGH
THURSDAY NIGHT. FLOODING COULD BECOME A PROBLEM FROM PORTIONS OF
TEXAS INTO THE LOWER AND MID MISSISSIPPI VALLEYS ESPECIALLY ACROSS
LOCATIONS THAT EXPERIENCED HEAVY RAIN LAST WEEK. NEEDLESS TO SAY
THAT TEMPERATURES BEHIND THE COLD FRONT AND BENEATH THE UPPER
LEVEL LOW WILL BE WELL BELOW AVERAGE FOR THIS TIME OF YEAR
ALLOWING LOW END SNOW ACCUMULATIONS TO EXTEND INTO PORTIONS OF
KANSAS AND NEBRASKA AND A COLD RAIN FOR EVERYONE ELSE BEHIND THE
FRONT.
HIGH PRESSURE ACROSS MUCH OF THE EAST WILL HOLD ON THROUGH TODAY
AND BEGIN TO DEPART ON THURSDAY INTO THE ATLANTIC. THIS WILL GIVE
THE EAST WARM AND SUNNY CONDITIONS TODAY WITH INCREASING CLOUDS ON
THURSDAY ALONG WITH PRECIPITATION ASSOCIATED WITH THE CENTRAL
PLAINS STORM INTO PORTIONS OF NORTHERN NEW ENGLAND. EXTREME
NORTHERN SECTIONS OF NEW ENGLAND ARE EXPECTED TO RECEIVE WINTRY
WEATHER DUE TO THE COLD AIR MOVING INTO THAT REGION AT THE MOMENT
WITH A COLD FRONT.
LOCATIONS WEST OF THE ROCKIES SHOULD STAY DRY WITH THE EXCEPTION
OF THE NORTHWEST WHERE A MATURE PACIFIC FRONT WILL BRING RAIN AND
CANADIAN ROCKY SNOW TO THE REGION BEGINNING THIS MORNING. THE
FRONT IS NOT ESPECIALLY STRONG IN TERMS OF COLD AIR BEHIND IT...
AND WILL ACTUALLY DISSIPATE AS IT REACHES THE NORTHERN PLAINS
FRIDAY MORNING. THE BIGGEST IMPACTS WILL BE ACROSS UPSLOPE FAVORED
REGIONS OF THE NORTHWEST WITH LIGHT TO MODERATE RAIN. LIGHT RAIN
AND CLOUDY CONDITIONS CAN BE EXPECTED FOR THE REST OF THE REGION.
OTTO
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