658
FXUS01 KWBC 060837
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
436 AM EDT MON OCT 06 2008
VALID 12Z MON OCT 06 2008 - 00Z WED OCT 08 2008
A SLOW MOVING... UPPER LOW NEAR THE TEXAS AND OKLAHOMA PANHANDLES
WILL SLOWLY PUSH A COLD FRONT THROUGH THE SOUTHERN PLAINS AND INTO
THE MISSISSIPPI VALLEY BY WEDNESDAY MORNING. ALTHOUGH THE FRONT
WILL WEAKEN IN TIME... ABUNDANT PRECIPITATION IS EXPECTED AHEAD OF
THE UPPER SYSTEM FROM THE WESTERN AND CENTRAL GULF COASTS... UP
INTO THE UPPER MISSISSIPPI VALLEY THROUGH TUESDAY. SOUTHERLY FLOW
OFF THE GULF OF MEXICO WILL TRANSPORT A RELATIVELY NARROW AXIS OF
MOISTURE ACROSS THE SOUTHERN PLAINS INTO THE CENTER OF THE
COUNTRY. THE ONGOING AREA OF HEAVY RAIN... CURRENTLY OVER TEXAS
AND OKLAHOMA... IS EXPECTED TO SPREAD NORTH TODAY WHILE THE WHOLE
AREA SLOWLY MOVES EAST. SOME STORMS COULD BECOME SEVERE TODAY
ACROSS THE ARKLATEX REGION DUE TO STRONG DYNAMICS ASSOCIATED WITH
THE UPPER LOW. ANY BREAKS IN CLOUD COVER WILL ALLOW ADDITIONAL
SURFACE HEATING... WHICH WILL LEAD TO FURTHER DESTABILIZATION OF
THE ATMOSPHERE AND AN INCREASED RISK OF SEVERE STORMS ACROSS OVER
THE ARKLATEX. AS THE COLD FRONT APPROACHES THE GULF COAST ON
TUESDAY... SHOWERS AND THUNDERSTORMS ARE POSSIBLE AHEAD OF THE
COLD FRONT ALONG THE GULF COAST REGION... ALTHOUGH STEADIER RAIN
IS LIKELY TO BE LOCATED FARTHER NORTH ACROSS THE MIDDLE AND UPPER
MISSISSIPPI VALLEYS.
A POWERFUL STORM SYSTEM IS FORECAST TO IMPACT THE PACIFIC
NORTHWEST BEGINNING TONIGHT... BRINGING ANOTHER ROUND OF RAIN AND
SNOW TO THE REGION. VERY STRONG WINDS IN THE LOWER LEVELS OF THE
ATMOSPHERE WILL MEAN STRONG WINDS ALONG THE COAST AND INTO THE
HIGHER TERRAIN OF THE NORTHWEST. STRONG UPSLOPE FLOW WILL LEAD TO
LOCALLY INTENSE PRECIPITATION TOTALS AND COLDER AIR MOVING IN WILL
DROP SNOW LEVELS TO AROUND 4000 FEET ACROSS THE NORTHERN CASCADES
ALLOWING FOR A FEW INCHES OF SNOW... HOWEVER MUCH COLDER AIR INTO
THE HIGHER TERRAIN OF BRITISH COLUMBIA WILL LEAD TO MUCH GREATER
TOTALS FOR OUR CANADIAN NEIGHBORS. AS THE COLD FRONT MOVES ACROSS
THE NORTHERN ROCKIES TUESDAY NIGHT INTO WEDNESDAY... SCATTERED
SHOWERS ARE POSSIBLE INTO MONTANA... WITH WEST FACING SLOPES
RECEIVING THE HIGHEST RAINFALL TOTALS. RAINFALL OVER MONTANA IS
EXPECTED TO BE MUCH LESS THAN NEAR THE COAST.
ACROSS THE EAST... A STRONG RIDGE OF HIGH PRESSURE WILL BUILD
SOUTH OVER THE NEXT TWO DAYS... PUSHING A COLD FRONT THROUGH THE
MID ATLANTIC REGION TODAY... NOTICEABLY REDUCING HIGH TEMPERATURES
ACROSS THE REGION FOR TUESDAY AND WEDNESDAY. THE FRONT IS EXPECTED
TO DISSIPATE TONIGHT AS THE RIDGE OF HIGH PRESSURE BRIDGES THE
FRONT... KEEPING MOST DAYTIME TEMPERATURES EAST OF THE
APPALACHIANS 10 TO 20 DEGREES COOLER THAN THOSE JUST WEST OF THE
MOUNTAINS FOR TUESDAY. THE ONLY PRECIPITATION EXPECTED FOR THE
EAST COAST IN THE SHORT RANGE PERIOD WILL BE SCATTERED
THUNDERSTORMS ACROSS FLORIDA AS MOIST... EASTERLY FLOW OFF OF THE
ATLANTIC KEEPS THE ATMOSPHERE UNSETTLED OVER THE EXTREME SOUTH.
OTTO
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page