Severe Thunderstorm Warning 121, NWS Shreveport, LA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
720 PM CDT MON MAY 12 2014

.AVIATION...
FOR THE 13/00Z TAF ISSUE...WIDESPREAD CONVECTION FOR THE NEXT 24
HOURS WILL RESULT IN POOR FLYING WEATHER WITH MVFR TO OCCASIONAL
IFR CONDITIONS DUE TO CIGS...RAIN AND FOG. EXPECT MODERATE TO
SEVERE TURBULENCE VICINITY TSTMS THROUGHOUT THE PERIOD. SURFACE
WIND GUSTS WITH TSTMS THIS EVENING TO 40 KTS. EAST TEXAS INTO
SOUTHEAST OK AND SOUTHWEST AR WILL EXPERIENCE THE STRONGER TSTMS
THIS EVENING...SPREADING EAST INTO NORTHERN LOUISIANA AFTER 06Z.
SURFACE WIND SOUTH 10 TO 15 KTS TONIGHT...SHIFTING TO WEST AND
NORTHWEST ACROSS NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA AS A COLD
FRONT ENTERS THE REGION. THE FRONT WILL BE SLOW TO CROSS THE
REGION...REACHING A KMLU TO KAEX BY 14/00Z. /14/

&&

.PREV DISCUSSION... /ISSUED 318 PM CDT MON MAY 12 2014/

DISCUSSION...
SIGNIFICANT HEAVY RAINFALL EVENT IS IN ITS BEGINNING STAGES ACROSS
CENTRAL AND N TX THIS AFTN PER REGIONAL MOSAIC RADAR IMAGERY.
MODELS ARE IN GOOD AGREEMENT THAT THIS EVENT WILL CONTINUE TO
UNFOLD AS THE FRONT PUSHES EWD INTO OUR REGION THIS EVENING/TONIGHT.
THE HEAVIEST RAINFALL IS EXPECTED TO FALL DURING THE OVERNIGHT
HOURS...BEFORE THE FRONT OUTRUNS THE UPPER LEVEL SUPPORT. TRAINING
OF STORMS...ESPECIALLY OVER AREAS THAT HAVE SEEN SIGNIFICANT
RAINFALL WITHIN THE LAST 7 DAYS WILL BRING THE THREAT OF FLASH
FLOODING TO MUCH OF E TX/SE OK/SW AR. IT APPEARS THAT THIS THREAT
MAY BEGIN EARLIER THAN ANTICIPATED...SO HAVE PUSHED THE START TIME
OF THE FLASH FLOOD WATCH UP TO 7 PM THIS EVENING. THE HEAVIEST
RAINFALL IS EXPECTED TO FALL DURING THE OVERNIGHT HOURS...BEFORE
THE FRONT OUTRUNS THE UPPER LEVEL SUPPORT. LIFT WILL BECOME MORE
ISENTROPIC AS WE LOSE THE SFC FORCING DURING THE DAY TUESDAY...
WHICH WILL LIKELY RESULT IN DECREASING RAIN RATES. DESPITE THIS...
A CONTINUING THREAT FOR FLASH FLOODING MAY BE SEEN DUE TO THE
OVERNIGHT RAINS...AND THE WATCH MAY NEED TO BE EXTENDED INTO
WEDNESDAY. MODELS CONTINUE TO BE IN RESPECTABLE AGREEMENT WITH
REGARD TO QPF...PAINTING A WIDESPREAD 3-5 INCHES /WITH HIGHER
ISOLD TOTALS LIKELY/ ACROSS THE WATCH AREA...TAPERING OFF
SIGNIFICANTLY TO THE SE.

RAIN IS EXPECTED TO FINALLY COME TO AN END WEDNESDAY
AFTERNOON/NIGHT...AS THE BASE OF THE UPPER TROF MOVES OVERHEAD.
UNSEASONABLY COOL TEMPERATURES ARE STILL EXPECTED TUESDAY THROUGH
THURSDAY AS NW FLOW ALOFT AND A COOL AIRMASS LINGER OVER THE
REGION. MODELS CONTINUE TO TOY WITH A BACK-DOOR COLD FRONT
DROPPING INTO OUR EXTREME N DURING FRI/SAT...WITH POSSIBLY SOME
LIGHT PRECIP OVER THE NRN HALF OF OUR REGION. BOTH THE GFS AND
EURO STALL THE FRONT TO OUR N...SO TEMPS ARE EXPECTED TO GRADUALLY
WARM THROUGH THE WEEKEND. /12/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  67  72  56  67  48 /  90  70  60  60  10
MLU  68  82  62  70  48 /  30  60  50  60  10
DEQ  59  65  52  65  40 / 100  60  60  50  10
TXK  60  66  54  64  46 / 100  70  60  60  10
ELD  66  72  55  65  43 /  70  70  50  60  10
TYR  60  64  53  67  46 / 100  60  60  30  10
GGG  62  67  54  66  45 / 100  70  60  30  10
LFK  69  73  56  69  47 /  80  70  50  40  10

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...FLASH FLOOD WATCH THROUGH TUESDAY AFTERNOON FOR THE FOLLOWING
     ZONES: ARZ050-051-059>061-070>072.

LA...FLASH FLOOD WATCH THROUGH TUESDAY AFTERNOON FOR THE FOLLOWING
     ZONES: LAZ001>003.

OK...FLASH FLOOD WATCH THROUGH TUESDAY AFTERNOON FOR THE FOLLOWING
     ZONES: OKZ077.

TX...FLASH FLOOD WATCH THROUGH TUESDAY AFTERNOON FOR THE FOLLOWING
     ZONES: TXZ096-097-108>112-124>126-136>138-149>151.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1144 AM CDT MON MAY 12 2014

ARZ050-051-059>061-070>072-LAZ001>003-OKZ077-TXZ096-097-108>112-
124>126-136>138-149>151-131645-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-CADDO-BOSSIER-WEBSTER-MCCURTAIN-RED RIVER-BOWIE-FRANKLIN-
TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-HARRISON-
CHEROKEE-RUSK-PANOLA-
1144 AM CDT MON MAY 12 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
ARKANSAS...NORTHWEST LOUISIANA...SOUTHEAST OKLAHOMA AND NORTHEAST
TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

SHOWERS AND THUNDERSTORMS ARE EXPECTED TO BECOME MORE NUMEROUS
THIS AFTERNOON AND TONIGHT...AS A SLOW MOVING COLD FRONT
APPROACHES. HEAVY RAINFALL WITH THE POTENTIAL FOR FLASH FLOODING
WILL BE THE PRIMARY THREAT WITH THIS STORM SYSTEM. HOWEVER...A
FEW SEVERE STORMS WITH DAMAGING WINDS AND LARGE HAIL CANNOT BE
RULED OUT...MAINLY OVER NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

HEAVY RAINFALL WILL CONTINUE THROUGH TUESDAY AND POSSIBLY INTO
WEDNESDAY. THIS WILL PUSH OVERALL STORM TOTALS AMOUNTS INTO THE THREE
TO FIVE INCH RANGE...WITH ISOLATED HIGHER AMOUNTS POSSIBLE...AND FLASH
FLOODING WILL REMAIN A THREAT UNTIL THIS SYSTEM MOVES OUT LATE
WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS AND STORM SPOTTERS MAY BE NEEDED TONIGHT.

ARZ073-LAZ004>006-010>014-017>022-TXZ152-153-165>167-131645-
UNION AR-CLAIBORNE-LINCOLN-UNION LA-DE SOTO-RED RIVER-BIENVILLE-
JACKSON-OUACHITA-SABINE LA-NATCHITOCHES-WINN-GRANT-CALDWELL-
LA SALLE-NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE-SABINE TX-
1144 AM CDT MON MAY 12 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
ARKANSAS...NORTH CENTRAL LOUISIANA...NORTHWEST LOUISIANA AND EAST
TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE TODAY AND
TONIGHT. ASIDE FROM LIGHTNING...NO WIDESPREAD HAZARDOUS WEATHER
IS EXPECTED.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORMS WILL BECOME MORE NUMEROUS BY DAYBREAK TUESDAY AS A
SLOW MOVING COLD FRONT CRAWLS EASTWARD. HEAVY RAINFALL WITH STORM
TOTALS OF TWO TO FOUR INCHES IS EXPECTED...AND FLASH FLOODING WILL
BE A THREAT UNTIL THIS SYSTEM MOVES OUT LATE WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS AND STORM SPOTTERS WILL NOT BE NEEDED THROUGH TONIGHT.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
636 PM CDT MON MAY 12 2014

TXZ108>110-124-125-136-149-130030-
CAMP-CHEROKEE-FRANKLIN-SMITH-TITUS-UPSHUR-WOOD-
636 PM CDT MON MAY 12 2014

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 730 PM CDT...FOR THE FOLLOWING
COUNTIES...

IN NORTHEAST TEXAS...
     FRANKLIN...SMITH...TITUS...UPSHUR...WOOD...CHEROKEE AND CAMP...

INCLUDING THE FOLLOWING LOCATIONS...
     ARP...BIG SANDY...BULLARD...GOLDEN...HAINESVILLE...HAWKINS...
     HOARD...JACKSONVILLE...LEESBURG...LINDALE...MINEOLA...MIXON...
     MOUNT SELMAN...MOUNT VERNON...NEWSOME...PLEASANT GROVE...
     PONTA...PURLEY...QUITMAN...REESE...ROSEWOOD...SCROGGINS...
     TROUP...TYLER...WHITEHOUSE AND WINNSBORO...

AT 630 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORMS 6 MILES SOUTHEAST OF
JACKSONVILLE...MOVING NORTHEAST AT 25 MPH. IN ADDITION...A SOLID
LINE OF INTENSE THUNDERSTORMS WERE SLOWLY MOVING INTO THE AFFECTED
AREA FROM THE WEST.

PENNY SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE
STORMS. EXTREMELY HEAVY RAINFALL MAY ALSO RESULT IN RISING WATER ON
ROADWAYS AND IN LOW LYING AREAS.

VII

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
813 PM CDT MON MAY 12 2014

TXZ097-112-126-137-138-149>153-165-130215-
ANGELINA-BOWIE-CASS-CHEROKEE-GREGG-HARRISON-MARION-NACOGDOCHES-
PANOLA-RUSK-SHELBY-
813 PM CDT MON MAY 12 2014

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 915 PM CDT...FOR THE FOLLOWING
COUNTIES...

IN NORTHEAST TEXAS...
     GREGG...HARRISON...MARION...PANOLA...RUSK...CHEROKEE...CASS AND
     BOWIE...
IN EASTERN TEXAS...
     NACOGDOCHES...SHELBY AND ANGELINA...

INCLUDING THE FOLLOWING LOCATIONS...
     ALTO...BECKVILLE...BEREA...DIBOLL...DOUGLASS...FOREST...
     GARRISON...HALLSVILLE...HARLETON...HENDERSON...HUDSON...
     HUNTINGTON...JEFFERSON...LINDEN...LODI...LUFKIN...MARSHALL...
     MINDEN...MORRILL...NACOGDOCHES...NEW SALEM...PINEHILL...
     POLLOK...REDWATER...SACUL...TATUM...TRAWICK...WELLS...WODEN AND
     WOODLAWN...

AT 811 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM MAUD TO 6
MILES EAST OF RUSK...OR ALONG A LINE EXTENDING FROM 13 MILES
SOUTHEAST OF NEW BOSTON TO 6 MILES EAST OF RUSK...MOVING NORTHEAST
AT 25 MPH.

PEA SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE
STORMS.

VII

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
825 PM CDT MON MAY 12 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0745 PM     TSTM WND DMG     12 SW JACKSONVILLE      31.84N  95.40W
05/12/2014                   CHEROKEE           TX   LAW ENFORCEMENT

            TREES DOWN ON FM 747 SOUTH IN THE PIERCES CHAPEL AREA.

&&

EVENT NUMBER SHV1400374

20

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
831 PM CDT MON MAY 12 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0740 PM     TSTM WND DMG     8 W JACKSONVILLE        31.97N  95.40W
05/12/2014                   CHEROKEE           TX   LAW ENFORCEMENT

            A FEW TREES DOWN ON FM 747 NORTH... ABOUT 6 MILES FROM
            HWY 79.

&&

EVENT NUMBER SHV1400375

20