Special Weather Statement, NWS Huntsville, AL

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1244 AM CDT THU AUG 9 2012

.UPDATE...
FOR 06Z TAFS

&&

.DISCUSSION...
/ISSUED 805 PM CDT WED AUG 8 2012/
ON THE WEATHER MAPS THIS EVENING...UPPER LEVEL RIDGING ENCOMPASSES
MUCH OF THE INTERMOUNTAIN WEST...WITH A TROUGHING PATTERN NOTED OVER
THE GREAT LAKES AND NEW ENGLAND REGIONS OF THE NORTHEAST. UPPER LEVEL
DISTURBANCES ROTATING AROUND THE BACKSIDE OF THE UPPER TROF TO THE
EAST CAN BE SEEN ON THE LATEST WATER VAPOR SATELLITE IMAGERY. A WEAK
SFC FRONT WAS ANALYZED NORTH OF THE AREA ACROSS THE OHIO RIVER
VALLEY...WITH A STRONGER FRONT APPROACHING THE UPPER MIDWEST.

TEMPERATURES ACROSS THE TENNESSEE VALLEY ARE CURRENTLY IN THE LOWER
TO MIDDLE 80S...WITH FORT PAYNE REPORTING 79F AT THIS HOUR. ISOLATED
SHOWERS AND STORMS ARE STILL ONGOING MAINLY ACROSS EASTERN PORTIONS
OF THE AREA (ERN MADISON AND NERN DEKALB COUNTIES). ANOTHER AREA OF
SHOWERS/STORMS (CURRENTLY OVER WALKER COUNTY) IS APPROACHING CULLMAN
COUNTY FROM THE SOUTHWEST. THOUGH MOST OF THE ACTIVITY WILL
DISSIPATE NOW THAT THE SUN HAS SET...AN UPPER LEVEL DISTURBANCE
APPROACHING FROM THE NORTHWEST WILL BRING ANOTHER SHOT AT CONVECTION
CLOSER TO THE 12Z TIMEFRAME. FOR THIS REASON...WILL LEAVE THE CURRENT
20-POPS AS IS. THE ONLY ADJUSTMENTS TO TONIGHT'S FORECAST WERE TO
INCREASE OVERNIGHT LOWS BY A DEGREE OR TWO...AND CORRESPONDINGLY
ADJUST THE HOURLY GRIDS AS A RESULT.

WILL ADJUST THE ZONES AS NECESSARY AND RESEND THEM SHORTLY.

12

&&

.AVIATION...
FOR 06Z TAFS...
NOT MUCH CHANGE FROM THE 00Z ISSUANCE...

LOW CLOUDS (~500FT) AND REDUCED VSBYS (~5SM) DEVELOPING BEFORE
DAYBREAK AT BOTH TERMINALS. ANOTHER MORE ORGANIZED ROUND OF SHOWERS
AND STORMS WILL POSSIBLY AFFECT THE AREA JUST AFTER SUNRISE...BUT
CONFIDENCE IN EXACT TIMING OF THIS ACTIVITY IS LOW. THEREFORE...HAVE
INCLUDED VCTS FOR MUCH OF THE REMAINDER OF THE TAF PERIOD AFTER
09/13Z.

AT KMSL...ISSUES ARE STILL ONGOING WITH THE COMMS LINE...THEREFORE
'AMD NOT SKED' WILL BE INCLUDED UNTIL FURTHER NOTICE.

12

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...NONE.
TN...NONE.
&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE
AT WEATHER.GOV/HUNTSVILLE.

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
629 PM CDT WED AUG 8 2012

ALZ001>010-016-TNZ076-096-097-091000-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
629 PM CDT WED AUG 8 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH ALABAMA AND PORTIONS
OF SOUTHERN MIDDLE TENNESSEE.

.DAY ONE...THIS EVENING AND TONIGHT...

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

ISOLATED THUNDERSTORMS ARE POSSIBLE ACROSS NORTHERN ALABAMA AND
SOUTHERN MIDDLE TENNESSEE THIS EVENING AND TONIGHT AS A WEAK
DISTURBANCE MOVES ACROSS THE AREA. AN ADDITIONAL ROUND OF ISOLATED
THUNDERSTORMS WILL OCCUR CLOSER TO DAYBREAK THURSDAY MORNING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

THERE IS A CHANCE OF THUNDERSTORMS FOR THE ENTIRE TENNESSEE VALLEY
DURING THE PERIOD FROM THURSDAY THROUGH FRIDAY. A FEW STRONG
THUNDERSTORMS WILL BE POSSIBLE WITH GUSTY WINDS, LIGHTNING, AND
LOCALLY HEAVY RAINFALL THE PRIMARY THREATS.

A SOUTHWARD ADVANCING COLD FRONT WILL END THE THREAT FOR STORMS FROM
NORTHWEST TO SOUTHEAST ACROSS THE AREA ON FRIDAY NIGHT. A SLIGHT
CHANCE OF THUNDERSTORMS WILL THEN RETURN TO THE REGION ONCE AGAIN ON
TUESDAY.

.SPOTTER CALL TO ACTION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL IS
NOT ANTICIPATED AT THIS TIME.

SL/CA

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
421 AM CDT THU AUG 9 2012

ALZ008-091000-
MARSHALL AL-
421 AM CDT THU AUG 9 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN MARSHALL COUNTY
UNTIL 500 AM CDT...

AT 415 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
TRACKING A STRONG THUNDERSTORM NEAR GUNTERSVILLE...MOVING
NORTHEAST AT 25 MPH.

WIND GUSTS OF 30 TO 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GUNTERSVILLE...GRANT AND UNION GROVE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

VERY HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY
LEAD TO MINOR FLOODING ON ROADS AND IN LOW LYING AREAS. DO NOT
DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 3426 8632 3439 8648 3458 8626 3445 8609
TIME...MOT...LOC 0915Z 225DEG 20KT 3436 8636

70/DD