Saturday Update

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It looks like we will see a lot of rain Sunday into Monday. There is a Flash Flood Watch in place for all of our counties. Computer models are putting 3 to 5 inches, or more, of rainfall in our area during that time frame. There is also a slight risk fr severe thunderstorms in our area today through Monday; that means hail, strong winds and isolated tornadoes are possible. Any watches or warnings that are issued for the area will be posted here on the blog.

Aside from the threat for those strong and heavy thunderstorms, it will stay warm, windy and humid. Highs Sunday and Monday will be in the low-80s with overnight temps in the low-70s to upper-60s.

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Monday, the worst of the weather will slowly shift to the south and east of West Alabama. Tuesday, another bit of energy will work through the Deep South and bring us a slight chance for a few more showers and thunderstorms.

We’ll dry out Wednesday and Thursday and see temperatures soar; upper-80s for highs both days! I wouldn’t be surprised, if the forecast holds, that we see our first 90 for the year one of those days.

Friday and Saturday, another front moves in and brings us another chance for rain and thunderstorms… just in time for the Tuscaloosa Air Show.

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Robert Stevenson
WVUA Weather

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Flash Flood Watch – Area Wide – Into Monday

FLOOD WATCH
NATIONAL WEATHER SERVICE BIRMINGHAM AL
323 PM CDT SAT MAY 1 2010

…EXCESSIVE RAINFALL EXPECTED SUNDAY AFTERNOON THROUGH MONDAY…

A VERY SIGNIFICANT HEAVY RAINFALL EVENT IS SETTING UP ACROSS
ALABAMA FROM SUNDAY AFTERNOON THROUGH MONDAY. AVERAGE STORM TOTAL RAINFALL AMOUNTS OVER THE FLASH FLOOD WATCH AREAS WILL BE 4 TO 7 INCHES. LOW-LYING AREAS WILL LIKELY FLOOD…AS WELL AS AREAS THAT DO NOT TYPICALLY HAVE FLOOD PROBLEMS. THIS IS POTENTIALLY A VERY DANGEROUS AND LIFE THREATENING SITUATION.

DEEP TROPICAL MOISTURE OUT AHEAD OF A SLOW MOVING COLD FRONT WILL RESULT IN A LONG PERIOD OF HEAVY RAINFALL… ASSOCIATED WITH SHOWERS AND THUNDERSTORMS SUNDAY AFTERNOON THROUGH MONDAY.

FLASH FLOOD WATCH SUNDAY AFTERNOON UNTIL 1:30 P.M. MONDAY FOR THE FOLLOWING COUNTIES: MARION, LAMAR, FAYETTE, WINSTON, WALKER, PICKENS, TUSCALOOSA, SUMTER & GREENE. INCLUDING THE CITIES OF HAMILTON, SULLIGENT, VERNON, FAYETTE, DOUBLE SPRINGS, JASPER, CARROLLTON, TUSCALOOSA, LIVINGSTON & EUTAW.

FLASH FLOOD WATCH SUNDAY AFTERNOON UNTIL 7:00 P.M. MONDAY FOR THE FOLLOWING COUNTIES: AUTAUGA, BIBB, BLOUNT, CHILTON, COOSA, DALLAS, ELMORE, JEFFERSON, LOWNDES, MONTGOMERY, PERRY, SHELBY, ST. CLAIR, TALLADEGA, CALHOUN, CHAMBERS, CLAY, CLEBURNE, RANDOLPH, TALLAPOOSA, CHEROKEE, ETOWAH, HALE AND MARENGO.

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* A SIGNIFICANT HEAVY RAINFALL EVENT IS EXPECTED TO DEVELOP OVER THE FLASH FLOOD WATCH AREA BEGINNING AS EARLY AS NOON ON SUNDAY. STORM TOTAL RAINFALL AMOUNTS…ENDING AT NOON ON MONDAY… ARE EXPECTED TO AVERAGE 4 TO 7 INCHES. RAINFALL TOTALS OF THIS MAGNITUDE WILL LIKELY CREATE SIGNIFICANT AND POTENTIALLY LIFE THREATENING FLASH FLOODING.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED.

Robert Stevenson
WVUA Weather

Tornado Watch Until 4:00 p.m.

THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF NORTHWEST ALABAMA, SOUTHEAST ARKANSAS, NORTHEAST LOUISIANA, NORTHERN AND CENTRAL MISSISSIPPI, WESTERN AND MIDDLE TENNESSEE EFFECTIVE THIS SATURDAY UNTIL 4:00 PM CDT.

IN ALABAMA THIS WATCH INCLUDES SIX COUNTIES: WALKER, MARION, WINSTON, FAYETTE, LAMAR AND PICKENS.

THIS INCLUDES THE CITIES OF… ALICEVILLE… CARROLLTON… FAYETTE… HALEYVILLE… HAMILTON… JASPER… SULLIGENT AND VERNON.

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TORNADOES…HAIL TO 2 INCHES IN DIAMETER… THUNDERSTORM WIND GUSTS TO 70 MPH… AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES WEST NORTHWEST OF NASHVILLE TENNESSEE TO 15 MILES SOUTH OF NATCHEZ MISSISSIPPI.

REMEMBER… A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS.

DISCUSSION…NUMEROUS THUNDERSTORMS CONTINUE TO AFFECT PORTIONS OF TN/MS/LA THIS MORNING…WITHIN A VERY MOIST AND UNSTABLE AIRMASS. WIDESPREAD WEAK LOW LEVEL WARM ADVECTION WILL LIKELY MAINTAIN THE RISK OF DISCRETE STORM DEVELOPMENT. LOW LEVEL VERTICAL SHEAR THROUGHOUT THE REGION IS FAVORABLE FOR SUPERCELLS AND TORNADOES. POCKETS OF DAYTIME HEATING THIS AFTERNOON WILL FURTHER INCREASE THE RISK OF SEVERE STORMS.

AVIATION…TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 24035.

Robert Stevenson & Isaac Williams
WVUA-Weather