Special Weather Statement, NWS Shreveport, LA

Area Forecast Discussion
National Weather Service Shreveport LA
1202 PM CDT SAT AUG 6 2016

.AVIATION...
Interesting TAF period setting up...especially later this
afternoon into the overnight periods. The center of the
large...expansive upper ridge had retrograded just enough
westward today that we will be under the influence of weak
northerly flow aloft across our northern and eastern terminal
locations. To go along with the slightly more favorable upper
level support is a nearly stalled surface frontal boundary which
was located near the S OK/N TX border into central AR. 12z progs
suggest this boundary will backdoor itself further into our region
from the northeast later today/tonight which could serve as an
additional focus for convection in the evening hours.

For this taf package...have prevailed VCTS at the TXK/ELD/MLU
terminals for the remainder of the daytime hours with tempo groups
to cover anything reductions in vsby or lowering of ceilings with
convection. There are some indications that we could see some
redevelopment of convection overnight in this dirty NW flow
pattern but have removed any weather mention in the terminals
after 07/03z or so.

13

&&

.PREV DISCUSSION... /issued 1106 AM CDT SAT AUG 6 2016/

DISCUSSION...
Fair skies will soon cloud up with cu with some already over our
southern tier. Our pwat in 1.9 this morning. There are some mid
clouds North which are associated with some outflow boundaries
that should act as a focal point for afternoon convection. No
changes to highs or pops, just updated with obs through 16z with
very few changes even there. /24/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV 100  78  99  78 /  30  20  30  20
MLU  97  77  96  76 /  30  20  40  20
DEQ  99  75  99  75 /  30  20  30  20
TXK  98  77  99  77 /  30  20  40  20
ELD  99  76  97  75 /  30  20  40  20
TYR 101  78 100  78 /  20  10  20  20
GGG 100  78 100  77 /  20  10  30  20
LFK  99  77  99  77 /  20  10  20  20

&&

.SHV Watches/Warnings/Advisories...
AR...Excessive Heat Warning until 7 PM CDT this evening for ARZ060-
     061-070>073.

     Heat Advisory until 7 PM CDT this evening for ARZ050-051-059.

LA...Excessive Heat Warning until 7 PM CDT this evening for
     LAZ001>006-010>014-017>022.

OK...Heat Advisory until 7 PM CDT this evening for OKZ077.

TX...Excessive Heat Warning until 7 PM CDT this evening for TXZ153-
     167.

     Heat Advisory until 7 PM CDT this evening for TXZ096-097-108>112-
     124>126-136>138-149>152-165-166.

&&

24/13

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1234 PM CDT SAT AUG 6 2016

ARZ050-051-059-OKZ077-TXZ096-097-108>112-124>126-136>138-149>152-
165-166-071745-
SEVIER-HOWARD-LITTLE RIVER-MCCURTAIN-RED RIVER-BOWIE-FRANKLIN-
TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-HARRISON-
CHEROKEE-RUSK-PANOLA-NACOGDOCHES-ANGELINA-SAN AUGUSTINE-
1234 PM CDT SAT AUG 6 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWEST ARKANSAS...ADJACENT
SOUTHEAST OKLAHOMA AND FOR MOST OF EASTERN TEXAS.

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

TEMPERATURES AROUND 100 DEGREES...WHEN COMBINED WITH MODERATE
HUMIDITY WILL RESULT IN HEAT INDEX VALUES OF 105 TO 109 DEGREES
THIS AFTERNOON WITH A HEAT ADVISORY IS IN EFFECT. PRECAUTIONS
SHOULD BE TAKEN WHEN WORKING OR PLAYING OUTDOORS WITH BREAKS IN
THE SHADE...WATER AND IF POSSIBLE...IN AIR CONDITIONING.

SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND
THROUGH EARLY THIS EVENING. BRIEF HEAVY DOWNPOURS WITH GUSTY WINDS
AND DANGEROUS CLOUD TO GROUND LIGHTNING WILL ALL BE POSSIBLE IN
THE STRONGER STORMS. IF THUNDER ROARS...GO INDOORS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

SCATTERED AFTERNOON THUNDERSTORMS WILL CONTINUE INTO THE NEW
WEEK AND SLOWLY DIMINISH TO ISOLATED BY LATE WEEK. IN ADDITION
AFTERNOON HEAT INDEX VALUES WILL CONTINUE AT OR ABOVE 105 DEGREES
DURING THE AFTERNOON HOURS.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS AND STORM SPOTTERS IS NOT ANTICIPATED THROUGH TONIGHT.

ARZ060-061-070>073-LAZ001>006-010>014-017>022-TXZ153-167-071745-
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-SHELBY-
1234 PM CDT SAT AUG 6 2016

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

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

TEMPERATURES NEAR 100 DEGREES COMBINED WITH HIGH HUMIDITY WILL
RESULT IN HEAT INDEX VALUES AROUND 110 DEGREES THIS AFTERNOON WITH
AN EXCESSIVE HEAT WARNING IN EFFECT. PRECAUTIONS SHOULD BE TAKEN
WHEN WORKING OR PLAYING OUTDOORS. SEEK FREQUENT BREAKS IN THE
SHADE WITH WATER AND IF POSSIBLE AIR CONDITIONING.

SCATTERED THUNDERSTORMS WILL ALSO BE POSSIBLE THROUGH EARLY THIS
EVENING. BRIEF HEAVY DOWNPOURS...GUSTY WINDS AND DANGEROUS CLOUD
TO GROUND LIGHTNING WILL BE POSSIBLE IN THE STRONGER STORMS. IF
THUNDER ROARS...GO INDOORS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

SCATTERED THUNDERSTORMS WILL REMAIN POSSIBLE FOR SUNDAY AND INTO
NEXT WEEK...INCREASING A BIT IN COVERAGE. IN ADDITION...HEAT
INDEX VALUES WILL CONTINUE TO APPROACH 110 DEGREES DURING THE
AFTERNOON HOURS AT LEAST THROUGH THIS WEEKEND. SOME PRECAUTIONS
FOR HEAT WILL REMAIN AS THE AFTERNOON THUNDERSTORM COVERAGE SLOWLY
DECREASE BY LATE WEEK.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS AND STORM SPOTTERS IS NOT ANTICIPATED THROUGH TONIGHT.

24

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
143 PM CDT SAT AUG 6 2016

LAZ010-061930-
DE SOTO LA-
143 PM CDT SAT AUG 6 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN DE SOTO PARISH UNTIL
230 PM CDT...

AT 143 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7
MILES WEST OF MANSFIELD. THIS STORM WAS NEARLY STATIONARY.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GRAND CANE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3206 9391 3212 9384 3206 9370 3195 9381
TIME...MOT...LOC 1843Z 310DEG 2KT 3206 9382

20

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
211 PM CDT SAT AUG 6 2016

LAZ018-062000-
NATCHITOCHES LA-
211 PM CDT SAT AUG 6 2016

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL NATCHITOCHES PARISH
UNTIL 300 PM CDT...

AT 211 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 14
MILES WEST OF NATCHITOCHES. THIS STORM WAS NEARLY STATIONARY.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
ALLEN...ROBELINE AND MARTHAVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3171 9334 3171 9343 3173 9344 3185 9344
      3190 9333 3189 9332 3189 9331 3175 9320
      3162 9334
TIME...MOT...LOC 1911Z 055DEG 2KT 3179 9334

20

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
225 PM CDT SAT AUG 6 2016

ARZ050-051-062015-
HOWARD AR-SEVIER AR-
225 PM CDT SAT AUG 6 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN HOWARD AND
NORTHWESTERN SEVIER COUNTIES UNTIL 315 PM CDT...

AT 225 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
GILLHAM...OR 8 MILES NORTHWEST OF DE QUEEN...MOVING NORTHEAST AT 10
MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
DE QUEEN AND GILLHAM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3414 9404 3403 9439 3410 9447 3419 9447
      3419 9424 3427 9424 3427 9426 3435 9425
TIME...MOT...LOC 1925Z 226DEG 11KT 3416 9440

20