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FXUS01 KWBC 300843
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
443 AM EDT SAT AUG 30 2008
VALID 12Z SAT AUG 30 2008 - 00Z MON SEP 01 2008
THE BIGGEST STORY IN THE WEATHER THROUGH THE WEEKEND AND INTO
EARLY MONDAY MORNING WILL BE THE APPROACH OF HURRICANE GUSTAV
WHICH WILL EMERGE FROM WESTERN CUBA EARLY SUNDAY MORNING. WHILE
THE CENTER OF THIS DEEPENING TROPICAL SYSTEM WILL REMAIN WELL
OFFSHORE DURING THE NEXT 60 HOURS...OUTER RAIN BANDS FROM GUSTAV
WILL BEING TO AFFECT THE FLORIDA KEYS BY AS EARLY AS MIDDAY
SATURDAY. ACROSS THE CENTRAL GULF COAST...CLOUD COVER WILL START
TO INCREASE BY THE END OF THE HOLIDAY WEEKEND AS THE UPPER-LEVEL
OUTFLOW FROM GUSTAV REACHES THE U.S. MAINLAND. IN ADDITION...WINDS
SHOULD BEGIN TO PICK UP IN SPEED BY MONDAY MORNING ACROSS THE
LOUISIANA AND MISSISSIPPI COASTLINE WITH SUSTAINED WINDS REACHING
20 MPH AND GUSTS APPROACHING 30 MPH. PLEASE VISIT THE NATIONAL
HURRICANE CENTER WEBSITE AT WWW.NHC.NOAA.GOV FOR DETAILED
INFORMATION ON THE FORECAST TRACK OF GUSTAV.
MOVING AWAY FROM THE TROPICS...THE UPPER-LEVEL PATTERN WILL BE
HIGHLY AMPLIFIED WITH TROUGHING OVER THE WEST AND A RIDGE BUILDING
OVER THE EASTERN THIRD OF THE NATION. THE STRENGTHENING TROUGH
OVER THE WEST WILL NOSE SOUTHWARD AND BRING MUCH COOLER AIR TO THE
REGION ACCOMPANIED BY SCATTERED RAIN SHOWERS. PRECIPITATION
AMOUNTS SHOULD REMAIN ON THE LIGHT SIDE WITH THE WEATHER SYSTEM
LACKING SIGNIFICANT MOISTURE. AT THE SURFACE...A STRONG FRONTAL
BOUNDARY WILL SLOWLY MOVE ACROSS THE INTERMOUNTAIN WEST WHILE
GRADUALLY PICKING UP MONSOONAL MOISTURE AS IT PROCEEDS EASTWARD.
BY SUNDAY...A CONCENTRATED AREA OF SHOWERS AND THUNDERSTORMS
SHOULD DEVELOP IN CLOSE PROXIMITY TO THE COLD FRONT ACROSS THE
UPPER-INTERMOUNTAIN WEST WITH TEMPERATURES FALLING BACK INTO THE
UPPER 50S TO LOWER 60S. FARTHER TO THE SOUTH...WIDESPREAD
THUNDERSTORMS WILL DEVELOP ACROSS MUCH OF THE DESERT SOUTHWEST
ALONG WITH THE CENTRAL INTERMOUNTAIN WEST AS WARM TEMPERATURES AND
AMPLE MOISTURE WILL CREATE VERY UNSTABLE ATMOSPHERIC CONDITIONS.
IN RESPONSE TO THE EXPECTED RAINFALL...NUMEROUS FORECAST OFFICES
HAVE ISSUED FLASH FLOOD WATCHES ACROSS THE DESERTS OF SOUTHERN
CALIFORNIA AND SOUTHERN NEVADA.
CONDITIONS ACROSS THE MISSISSIPPI VALLEY WILL BE SEASONABLY WARM
UNDERNEATH THE BUILDING RIDGE ALOFT. CONSEQUENTLY...HIGH
TEMPERATURES ON SUNDAY WILL PUNCH INTO THE UPPER 80S AS FAR NORTH
AS MINNESOTA AND THE UPPER PENINSULA OF MICHIGAN. TEMPERATURES
SHOULD ALSO BE ON THE RISE ACROSS THE EASTERN SEABOARD AS THE
RIDGE SPREADS EASTWARD. THIS WILL BRING ABUNDANT SUNSHINE TO THE
REGION AFTER HAVING DEALT WITH THE REMNANTS OF FAY THE PAST COUPLE
OF DAYS.
RUBIN-OSTER
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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