Special Weather Statement, NWS Shreveport, LA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
434 PM CDT TUE APR 19 2016

.DISCUSSION...
THIS AFTERNOON SHOWERS AND THUNDERSTORMS WERE ON THE INCREASE OVER
PARTS OF DEEP EAST TEXAS ACROSS NORTHWEST AND NORTH CENTRAL
LOUISIANA AND SOUTH CENTRAL ARKANSAS. THIS DUE TO THE WARM
TEMPERATURES ACROSS THIS REGION ALONG WITH AVAILABLE GULF MOISTURE
BY THE SOUTHERLY LOW LEVEL FLOW AROUND THE FRONT SIDE OF AN
INVERTED TROUGH OF LOW PRESSURE FROM SOUTH CENTRAL TEXAS ACROSS
EAST AND NORTHEAST TEXAS AND PARTS OF SOUTHEAST OKLAHOMA AND
SOUTHWEST ARKANSAS. ALSO A SMALL SCALE SHORT WAVE EMBEDDED IN THE
FLOW AROUND THE TOP OF A FLAT RIDGE OF HIGH PRESSURE ALOFT OVER
MEXICO AND SOUTH TEXAS...AND INTO THE BACK SIDE OF A RIDGE OF
HIGH PRESSURE ALOFT FROM THE NORTHERN GULF INTO THE GREAT LAKES
AREA. EXPECTING THIS REGION OF CONVECTION TO END DURING THE
OVERNIGHT HOURS. WENT LOWER POPS OVER PARTS OF NORTHEAST
TEXAS...SOUTHWEST ARKANSAS...AND SOUTHEAST OKLAHOMA EARLY
TONIGHT...BUT INCREASED LATE AS A SHORT WAVE TROUGH ROUNDING THE
BASE OF A LARGE UPPER LOW SPINNING OVER THE ROCKIES SHIFTS ACROSS
OKLAHOMA AND NORTH TEXAS. THIS SYSTEM WILL BE NUDGING A SURFACE
COLD FRONT TOWARD THE FOUR STATE REGION THAT WILL BE SLOW TO ENTER
THE AREA UNTIL THE NEXT SHORT WAVE ROUNDS THE BASE OF THE UPPER
TROUGH AS THAT ASSOCIATED UPPER LOW LIFTS EAST ACROSS THE PLAINS TOWARD
THE UPPER MIDWEST AND GREAT LAKES REGION LATE WEDNESDAY AND INTO
THURSDAY. SOME OF THE HEAVIER RAINFALL AMOUNTS WILL MOST LIKELY
SET UP ACROSS PARTS OF EAST AND NORTHEAST TEXAS...NORTH
LOUISIANA...AND SOUTHWEST AND SOUTH CENTRAL ARKANSAS FOR WEDNESDAY
AND INTO THURSDAY. HAVE NOT ISSUED A FLASH FLOOD WATCH THIS
SHIFT...BUT LATER SHIFTS WILL LIKELY DETERMINE THE AREAS THAT
WILL NEED ONE AS ORIENTATION OF THE AXIS LINES UP. RAIN CHANCES
WILL DECREASE IN WAKE OF THE COLD FRONT AND PASSAGE OF THE UPPER
TROUGH OF LOW PRESSURE. WITH HIGH PRESSURE ON THE SURFACE AND
ALOFT SHIFTING OVER THE FOUR STATE REGION DRY CONDITIONS SHOULD
PREVAIL FOR MOST OF FRIDAY THROUGH THE LATE WEEKEND. THE NEXT
UPPER LEVEL DISTURBANCE WILL ARRIVE ON SUNDAY NIGHT INTO MONDAY
RETURNING RAIN CHANCES. THE RAIN CHANCES WILL BE SMALL BUT LINGER
INTO THE FIRST HALF OF THE WORK WEEK.

&&

.PREV DISCUSSION... /ISSUED 1259 PM CDT TUE APR 19 2016/

AVIATION...
RATHER UNCERTAIN CIG/VSBY FCST THIS PD...AND A MIXED BAG OF
FLIGHT CATEGORIES THROUGOUT THE PD IS THE LIKELY RESULT. WE WILL
LIKELY SEE OFF AND ON PERIODS OF SHWRS/TSTMS WITH CIGS IMPROVING
SOME THIS AFTERNOON OVER E TX/N LA. ANY IMPROVEMENT WILL BE LOST
20/03-06Z AS LOW STRATUS AND FOG LIKELY DEVELOP ONCE AGAIN.
ANOTHER ROUND OF CONVECTION WILL MOVE INTO THE REGION EARLY WED
MORNING AND CONTINUE THROUGH AND BEYOND THE 18Z TAF PD. /12/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  64  75  63  76 /  60  80  70  60
MLU  63  76  63  76 /  60  80  70  60
DEQ  62  74  58  75 /  60  80  60  40
TXK  63  74  61  76 /  60  80  60  40
ELD  63  74  63  76 /  50  80  70  50
TYR  65  75  63  77 /  70  80  50  60
GGG  64  74  63  76 /  60  80  60  60
LFK  65  76  65  78 /  60  80  70  60

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
LA...NONE.
OK...NONE.
TX...NONE.
&&

06/12

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1244 PM CDT TUE APR 19 2016

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-201100-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-UNION-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN-DE SOTO-
RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE-NATCHITOCHES-WINN-
GRANT-CALDWELL-LA SALLE-MCCURTAIN-BOWIE-FRANKLIN-TITUS-CAMP-
MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-HARRISON-CHEROKEE-RUSK-
PANOLA-NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE-
1244 PM CDT TUE APR 19 2016

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

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

PERIODS OF MODERATE TO HEAVY RAINFALL WILL BE POSSIBLE FOR PARTS
OF SOUTHERN ARKANSAS AND NORTH LOUISIANA. PRECIPITATION TOTALS OF
AN INCH OR TWO CAN BE EXPECTED. ADDITIONALLY...EMBEDDED
THUNDERSTORMS CAPABLE OF PRODUCING GUSTY WINDS MAY BE POSSIBLE
THIS AFTERNOON AND EVENING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS ON WEDNESDAY AND
THURSDAY COULD PRODUCE LOCALLY HEAVY RAINFALL AND THE POTENTIAL
FOR FLASH FLOODING. ISOLATED SEVERE THUNDERSTORMS PRODUCING HAIL
AND DAMAGING WINDS ARE ALSO POSSIBLE ON WEDNESDAY AND THURSDAY.
PRECIPITATION WILL DIMINISH THURSDAY AFTERNOON WITH THE PASSAGE OF
A WEAK COLD FRONT THAT WILL MOVE THROUGH THE REGION.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND AMATEUR
RADIO OPERATORS...IS NOT EXPECTED THIS AFTERNOON AND EVENING.

06

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PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SHREVEPORT LA
618 PM CDT TUE APR 19 2016

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

0600 PM     FLASH FLOOD      6 ESE BRYCELAND         32.41N  92.89W
04/19/2016                   BIENVILLE          LA   LAW ENFORCEMENT

            FLOODING AT INTERSECTION OF HWY 507 AND 797 WITH
            BARRICADES BLOCKING ROAD TO TRAFFIC

&&

CORRECTED LOCATION

EVENT NUMBER SHV1600378

19

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
619 PM CDT TUE APR 19 2016

LAZ001-002-010-200000-
DE SOTO LA-BOSSIER LA-CADDO LA-
619 PM CDT TUE APR 19 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL CADDO...SOUTHERN
BOSSIER AND NORTHWESTERN DE SOTO PARISHES UNTIL 700 PM CDT...

AT 618 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 12 MILES SOUTH OF GREENWOOD
TO NEAR STONEWALL TO 8 MILES SOUTH OF BOSSIER CITY...AND MOVING NORTH
AT 10 MPH.

WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
SHREVEPORT...BOSSIER CITY...STONEWALL...KEACHI...FORBING...ROBSON AND
KEITHVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3234 9389 3240 9377 3253 9360 3239 9361
      3223 9376 3216 9398
TIME...MOT...LOC 2318Z 181DEG 9KT 3227 9391 3231 9376 3240 9368

24

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
637 PM CDT TUE APR 19 2016

LAZ001>003-200015-
BOSSIER LA-WEBSTER LA-CADDO LA-
637 PM CDT TUE APR 19 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL CADDO...
SOUTHEASTERN BOSSIER AND SOUTHWESTERN WEBSTER PARISHES UNTIL 715 PM
CDT...

AT 637 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 9 MILES SOUTHEAST OF
SHREVEPORT TO NEAR BOSSIER CITY TO NEAR SIBLEY...AND MOVING NORTHEAST
AT 15 MPH.

WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
SHREVEPORT...BOSSIER CITY...MINDEN...HAUGHTON...SIBLEY...DOYLINE...DIXIE
INN...EASTWOOD...FOSTERS...NOLES LANDING...RED CHUTE...GILARK...FORBING...
ROBSON...FERGUSON...SLIGO...PRINCETON...FILLMORE...BARKSDALE AIR FORCE
BASE AND LAKE BISTINEAU NORTH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3246 9329 3240 9361 3232 9369 3233 9370
      3232 9371 3233 9373 3233 9374 3234 9374
      3234 9375 3254 9372 3266 9354 3266 9328
TIME...MOT...LOC 2337Z 205DEG 16KT 3237 9368 3247 9359 3251 9334

24

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
711 PM CDT TUE APR 19 2016

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

0630 PM     HEAVY RAIN       8 SSE SHREVEPORT        32.36N  93.75W
04/19/2016  E2.00 INCH       CADDO              LA   NWS EMPLOYEE

            VERY HEAVY RAINFALL WITH MINOR STREET FLOODING IN
            ELLERBE ESTATES ALONG ELLERBE ROAD SOUTH OF LOOP 3132

&&

EVENT NUMBER SHV1600379

19

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
724 PM CDT TUE APR 19 2016

TXZ138-151-200115-
HARRISON TX-PANOLA TX-
724 PM CDT TUE APR 19 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN HARRISON AND NORTH
CENTRAL PANOLA COUNTIES UNTIL 815 PM CDT...

AT 724 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7
MILES WEST OF ELYSIAN FIELDS...OR 13 MILES NORTH OF CARTHAGE...MOVING
NORTH AT 10 MPH.

WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
MARSHALL...WASKOM...ELYSIAN FIELDS AND SCOTTSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3224 9423 3230 9443 3255 9437 3251 9405
TIME...MOT...LOC 0024Z 199DEG 11KT 3234 9430

24