Severe Thunderstorm Warning 102, NWS Huntsville, AL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HUNTSVILLE AL
230 PM CDT WED AUG 20 2014

.DISCUSSION...
THE 19Z IR/VISIBLE SATELLITE IMAGERY ALONG WITH AREA 88-DS INDICATED
THAT A WEAK SHORT WAVE WAS MOVING SOUTHEAST THROUGH SOUTHERN INDIANA.
SCATTERED SHOWERS AND STORMS WERE DEVELOPING INTO WESTERN KENTUCKY
AND THEN FURTHER SOUTHEAST INTO MIDDLE AND TOWARD EAST TENNESSEE IN
THE PVA REGION AHEAD OF THE SHORT WAVE. IT WAS HOT AND HUMID WITH
TEMPS IN THE LOWER 90S WITH DEWPOINTS IN THE LOW TO MID 70S IN NORTH
ALABAMA AND INTO SOUTHERN MIDDLE TENNESSEE.

EXPECT THAT A FEW OF THE SCATTERED SHOWERS AND STORMS THAT FORM TO
THE NORTH OF THE FORECAST AREA THROUGH LATE AFTERNOON/EARLY EVENING
MAY MOVE INTO A PORTION OF SOUTHERN MIDDLE TENNESSEE AND INTO
NORTHEAST ALABAMA. HAVE ADDED IN A SLIGHT CHANCE POP FOR THESE AREAS
TO ACCOUNT FOR THE POSSIBILITY OF A COUPLE OF HOURS OF CONVECTION
THIS EVENING. HAVE BUMPED UP DEWPOINTS THIS EVENING ALSO DUE TO
CURRENT TRENDS.

IN THE SHORT TERM...THE MODELS ARE IN FAIR AGREEMENT INVOLVING
DEVELOPING AND MOVING A DECENT MID TO UPPER LEVEL RIDGE AXIS NORTH-
NORTHEAST TOWARD THE FORECAST AREA BY THURSDAY. HAVE ONLY TWEAKED
TEMPS SLIGHTLY UPWARD IN THE SHORT TERM A COUPLE OF DEGREES INTO THE
MID 90S FOR THURSDAY AND FRIDAY. TODAY...THE MODELS ARE BOTH SIMILAR
IN KEEPING THE RIDGE AXIS SLIGHTLY WESTWARD COMPARED TO PREVIOUS
MODEL RUNS. WILL CONTINUE WITH HOT AND HUMID CONDITIONS THROUGH
SUNDAY... ALTHOUGH EXPECT THAT HEAT INDICES WILL REMAIN JUST BELOW
HEAT INDEX CRITERIA FOR THE FORECAST AREA.

BY SUNDAY...THE GFS AND ECMWF MODELS ARE SIMILAR IN SLIGHTLY
RETROGRADING THE RIDGE AXIS SLIGHTLY WESTWARD...WITH AN INCREASE IN
LOW LEVEL MOISTURE EXPECTED FROM THE NORTHEAST TO EAST OF THE
FORECAST AREA. WILL NOT ADD IN A SLIGHT CHANCE POP YET FOR
SUNDAY AND WILL GO CLOSER TO THE GFS MODEL SOLUTION...BUT THIS MAY
NEED TO BE ADJUSTED IF THE NEXT MODEL RUN IS SIMILAR TO TODAYS 12Z
ECMWF RUN.

WILL KEEP IN MAINLY AFTERNOON SHOWER AND THUNDERSTORM CHANCES FOR
MONDAY THROUGH THE END OF THE EXTENDED FORECAST PERIOD ON WEDNESDAY.
THE RIDGE AXIS IS EXPECTED TO CONTINUE TO BREAK DOWN ON MONDAY...WITH
MORE LOW LEVEL MOISTURE AND INSTABILITY EXPECTED TO BE PRESENT ALONG
WITH AFTERNOON HEATING AND THE LACK OF A CAP TO LIMIT SHOWER AND
STORM DEVELOPMENT. HAVE LOWERED HIGH TEMPS SLIGHTLY FROM MONDAY
THROUGH WEDNESDAY WITH MORE AFTERNOON CLOUDS EXPECTED AND SLIGHT
CHANCE POPS EACH AFTERNOON.

TT

&&

.AVIATION...
/ISSUED 1200 PM CDT WED AUG 20 2014/
FOR 18Z TAFS...
VFR CONDS ARE GENERALLY EXPECTED AT BOTH TERMINALS THRU THE TAF
PERIOD. A FEW SHOWERS/STORMS ARE POSSIBLE MAINLY EAST OF KHSV, BUT
WILL NOT INCLUDE VCTS AT KHSV WITH THIS ISSUANCE. SKIES WILL CLEAR
OUT OVERNIGHT TONIGHT, WITH PATCHY FOG POSSIBLE AT BOTH KHSV/KMSL,
WITH MVFR CONDS POSSIBLE BETWEEN 10-12Z TOMORROW MORNING. OTHERWISE,
AS HIGH PRESSURE BUILDS INTO THE REGION, CLEAR SKIES/VFR CONDS ARE
ANTICIPATED AFTER 12Z, LINGERING THRU THE END OF THE TAF PERIOD.

12

&&

.PRELIMINARY POINT TEMPS/POPS...
HUNTSVILLE    72  95  72  95 /   0   0   0   0
SHOALS        72  96  73  97 /   0   0   0   0
VINEMONT      74  96  76  96 /   0   0   0   0
FAYETTEVILLE  71  93  72  94 /   0   0   0   0
ALBERTVILLE   72  96  73  95 /  20   0   0   0
FORT PAYNE    70  95  73  95 /  20   0   0   0

&&

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

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

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HUNTSVILLE AL
406 PM CDT WED AUG 20 2014

ALZ001>010-016-TNZ076-096-097-211000-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
406 PM CDT WED AUG 20 2014

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

.DAY ONE...TONIGHT...

A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR LINCOLN...MOORE AND
FRANKLIN COUNTIES IN SOUTHERN MIDDLE TENNESSEE. ISOLATED TO SCATTERED
THUNDERSTORMS ARE POSSIBLE ACROSS ESPECIALLY SOUTHERN MIDDLE
TENNESSEE AND INTO NORTHEAST ALABAMA INTO THE EVENING. A FEW OF THE
STORMS MAY BECOME SEVERE WITH DAMAGING WINDS...LARGE HAIL...FREQUENT
LIGHTNING AND VERY HEAVY RAINFALL POSSIBLE. THE STORMS ARE EXPECTED
TO DISSIPATE BY LATE EVENING ACROSS THE AREA.

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

HOT AND MUGGY CONDITIONS ARE EXPECTED FOR THE REST OF THE
WEEK...CONTINUING INTO THE MIDDLE OF NEXT WEEK. AFTERNOON HIGH
TEMPERATURES WILL TOP OUT IN THE MIDDLE TO UPPER 90S...WITH HEAT
INDEX VALUES APPROACHING 105 DEGREES IN MANY LOCATIONS. THIS LONGER
DURATION HEAT WAVE WILL INCREASE THE THREAT FOR HEAT RELATED
ILLNESSES.

ISOLATED THUNDERSTORMS RETURN TO THE AREA NEXT MONDAY THROUGH
WEDNESDAY AFTERNOONS AS A FEW WEAK DISTURBANCES ALOFT MOVE ACROSS
ACROSS THE REGION.

.SPOTTER CALL TO ACTION STATEMENT...

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

TT

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
216 PM CDT WED AUG 20 2014

TNZ097-202000-
FRANKLIN TN-
216 PM CDT WED AUG 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR FRANKLIN COUNTY UNTIL 300 PM
CDT...

AT 216 PM CDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
TIMS FORD LAKE...OR NEAR WINCHESTER...MOVING EAST AT 20 MPH.

PEA SIZE HAIL AND WIND GUSTS UP TO 40 MPH WILL BE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
WINCHESTER...DECHERD...ESTILL SPRINGS...COWAN...MONTEAGLE...TIMS FORD
LAKE...SEWANEE...ALTO...BELVIDERE AND HARMONY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

LOCALLY 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 3529 8591 3522 8586 3502 8586 3514 8629
      3532 8624
TIME...MOT...LOC 1916Z 282DEG 18KT 3522 8618

12

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
423 PM CDT WED AUG 20 2014

TNZ097-202200-
FRANKLIN TN-
423 PM CDT WED AUG 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN FRANKLIN COUNTY
UNTIL 500 PM CDT...

AT 423 PM CDT...DOPPLER RADAR INDICATED A LINE OF STRONG
THUNDERSTORMS EXTENDING FROM 9 MILES NORTHEAST OF ESTILL SPRINGS TO
6 MILES NORTHWEST OF TRACY CITY...AND MOVING SOUTHEAST AT 15 MPH.

WIND GUSTS OF 30 TO 40 MPH WILL BE POSSIBLE WITH THIS LINE OF STORMS
AS IT MOVES ALONG THE BORDER OF FRANKLIN AND GRUNDY COUNTIES.

LOCATIONS IMPACTED INCLUDE...
DECHERD...COWAN...MONTEAGLE...SEWANEE...ALTO...ARNOLD AFB...WOODS
RESERVOIR AND ST. ANDREWS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STRONG GUSTY WINDS WILL BE CAPABLE OF KNOCKING DOWN SMALL TREE
LIMBS...ALONG WITH OTHER SMALL UNSECURED ITEMS. SEEK SAFE SHELTER
UNTIL THIS LINE OF STORMS HAS PASSED.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THE LINE OF
STORMS. LIGHTNING CAN STRIKE SEVERAL MILES AWAY FROM THE PARENT
THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3534 8603 3531 8600 3532 8598 3531 8597
      3531 8596 3528 8591 3522 8586 3509 8586
      3509 8595 3535 8613
TIME...MOT...LOC 2120Z 314DEG 15KT 3533 8599 3534 8583

70/DD

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
451 PM CDT WED AUG 20 2014

TNZ097-202230-
FRANKLIN TN-
451 PM CDT WED AUG 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN FRANKLIN COUNTY UNTIL 530
PM CDT...

AT 451 PM CDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
SEWANEE...OR 9 MILES EAST OF WINCHESTER...MOVING SOUTHEAST AT 25 MPH.

PENNY SIZE HAIL AND WIND GUSTS AROUND 50 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
DECHERD...COWAN...MONTEAGLE...SEWANEE...ANDERSON...ALTO...SHERWOOD
AND ST. ANDREWS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STRONG GUSTY WINDS WILL BE CAPABLE OF KNOCKING DOWN SMALL TREE
LIMBS...ALONG WITH OTHER SMALL UNSECURED ITEMS. SEEK SAFE SHELTER
UNTIL THIS STORM HAS PASSED.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE SEVERAL MILES AWAY FROM THE PARENT THUNDERSTORM.
SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3528 8591 3522 8586 3499 8587 3499 8597
      3520 8607 3530 8594
TIME...MOT...LOC 2151Z 311DEG 22KT 3521 8595

70/DD

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