Special Weather Statement, NWS Shreveport, LA

Area Forecast Discussion
National Weather Service Shreveport LA
637 PM CDT Fri Apr 9 2021

.AVIATION...
Convection to continue across area terminals through late this
evening to the early morning hours as a frontal boundary moves
across the region. MVFR ceilings possible through 10/12Z across
area terminals with conditions improving to VFR on Saturday.
Otherwise south to southwest winds up to 15 knots tonight to
become northwest at 15 knots and gusty on Saturday. Stronger winds
in and around periods of convection. /05/

&&

.PREV DISCUSSION... /issued 556 PM CDT Fri Apr 9 2021/

UPDATE...
The severe weather threat continues across portions of deep east
Texas and north Louisiana as convection is forecast to initiate
in the warm sector along and south of a frontal boundary across
these areas. Steep lapse rates aloft will contribute to a large
hail threat and damaging with threat with a lesser tornado threat
at this time. However, the tornado threat should increase later
tonight. A new severe thunderstorm watch, number 83, has just been
issued for portions of east Texas and north Louisiana, remaining
in effect through 11 PM. /05/

PREV DISCUSSION... /issued 414 PM CDT Fri Apr 9 2021/

SHORT TERM.../Tonight through Saturday Night/

Isolated strong to severe thunderstorms have developed across the
northern half of the region, generally north of Interstate 20,
this afternoon as a warm front lifts north across the region.
Steep mid level lapse rates, along with low wetbulb zero heights,
have resulted in several storms producing large hail. This
prompted the Storm Prediction Center to issue a Severe
Thunderstorm Watch until 23z this evening. There will likely be a
bit of a break during the early evening hours, but additional
severe storms will be possible late this evening and overnight as
a cold front accelerates southeast through the region.

MlCape will rise about 2000 J/kg in wake of the warm front, with
dewpoints in the 60s along with sufficient deep layer shear.
Additional convection is expected to develop as individual cells
near the front before growing into a squall line late this
evening. Damaging winds, large hail, and isolated tornadoes are
all possible late this evening and overnight as the front moves
through the region. Behind the front, northwest winds will bring
in cooler and drier air into the region. Expect mostly sunny skies
on Saturday with highs ranging from the lower to mid 70s, which
is near climatic normals. /20/

LONG TERM.../Sunday through Thursday Night/

A surface ridge will be directly overhead allowing clear skies,
lights winds, and a cool start Sunday morning. As the ridge moves
east, low-level southerly winds will return by the afternoon. Wind
speeds will generally be 10 kts or less, but the additional warm air
advection will help to enhance the warming from the abundant
sunshine. Daytime high temperatures on Sunday will likely be in the
upper 70s to mid 80s. The warming trend will continue for most areas
into Monday, and dry weather should persist until Monday afternoon.

A broad upper trough moving across the Northern Plains and Upper
Mississippi River Valley will help to slowly push a cold front
through the area during the day Monday. Scattered showers and few
thunderstorms should finally develop Monday afternoon south of
Interstate 20 as the front finally encounters better deep layer
moisture. Increasing isentropic ascent behind the surface front, but
in advance of and near a quasi-stationary 850 hPa front near
Interstate 30 will result in increase showers and thunderstorms
Monday evening and into Tuesday. A similar situation will likely
occur Tuesday evening and into Wednesday with another round of
precip as a blocking pattern aloft develops over the Northern CONUS
keeping a somewhat fast and active zonal flow over the forecast
area. Very little change in this pattern is anticipated through
Thursday until the block begins to break down into Friday.

CN

PREV DISCUSSION... /issued 153 PM CDT Fri Apr 9 2021/

AVIATION...

For the 09/18Z TAF update, a mix bag of flight conditions across
the region as convection and low cigs move into the region. Look
for this trend to continue through a large portion of the TAF
period. The first or two rounds of strong to severe TSRA has
started across the region, with the second round coming as a cold
front moves across the area late this evening. VFR skies will move
into the region from the northwest by the end of the period with
winds from the northwest at or over 10 kts. /20/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  58  74  49  82 /  80   0   0   0
MLU  63  76  50  80 / 100   0   0   0
DEQ  50  70  43  80 /  90   0   0   0
TXK  55  71  48  80 /  90   0   0   0
ELD  56  73  45  80 /  90   0   0   0
TYR  53  73  49  82 /  60   0   0   0
GGG  54  72  48  81 /  70   0   0   0
LFK  58  76  50  85 /  50   0   0   0

&&

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

05/20/09

Hazardous Weather Outlook
National Weather Service Shreveport LA
1258 PM CDT Fri Apr 9 2021

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-101100-
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-
1258 PM CDT Fri Apr 9 2021

This Hazardous Weather Outlook is for portions of south central
Arkansas, southwest Arkansas, north central Louisiana, northwest
Louisiana, southeast Oklahoma, east Texas and northeast Texas.

.DAY ONE...This Afternoon and Tonight...

A Severe Thunderstorms Watch is in effect until 6 PM CDT for much
of Southwest Arkansas, portions of East Texas and Northeast
Texas, and much of Northwest and North Central Louisiana.

Scattered thunderstorms are rapidly developing across the
ArkLaTex. Some of these storms may be severe, with damaging winds,
large hail, and tornadoes possible. Additional thunderstorm
development is possible this evening over portions of East Texas
and North Louisiana, ahead of a severe squall line that will
develop over Eastern Oklahoma and quickly shift southeast across
the region from mid evening through the overnight hours. The
severe weather threat will become more pronounced with this squall
line, with damaging winds, large hail, isolated tornadoes, and
locally heavy rainfall possible. These storms will diminish from
northwest to southeast late tonight.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

Scattered showers and isolated thunderstorms will be possible
across the region Tuesday through Thursday. However, no hazardous
weather is expected.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters will be needed this afternoon
through tonight across the region.

09

Special Weather Statement
National Weather Service Shreveport LA
750 PM CDT Fri Apr 9 2021

ARZ073-LAZ003>006-012-100130-
Union AR-Bienville LA-Lincoln LA-Union LA-Claiborne LA-Webster LA-
750 PM CDT Fri Apr 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL UNION COUNTY...
SOUTHEASTERN WEBSTER...WESTERN UNION...CLAIBORNE...NORTH CENTRAL
BIENVILLE AND NORTHERN LINCOLN PARISHES UNTIL 830 PM CDT...

At 749 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Minden, moving northeast at 40 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Minden, Homer, Junction City, Farmerville, Arcadia, Bernice,
Gibsland, Dubberly, Cooley, Dubach, Vienna, Evergreen, Athens,
Lisbon, Spearsville, Lillie, Mount Lebanon, D Arbonne, Mount Zion and
Lake Clairborne.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Arkansas...and north central and northwestern
Louisiana.

LAT...LON 3248 9320 3283 9334 3313 9260 3299 9248
      3287 9243 3274 9241 3265 9242
TIME...MOT...LOC 0049Z 242DEG 36KT 3268 9317

19

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
754 PM CDT FRI APR 9 2021

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

0224 PM     HAIL             4 S BENTON              32.63N 93.73W
04/09/2021  E0.88 INCH       BOSSIER            LA   BROADCAST MEDIA

            REPORT OF NICKEL SIZE HAIL EAST OF BENTON
            ROAD AND JUST NORTH OF KINGSTON ROAD.

&&

20

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
806 PM CDT FRI APR 9 2021

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

0710 PM     HAIL             8 WSW BROWNSVILLE-BAWCO 32.46N 92.29W
04/09/2021  E1.00 INCH       OUACHITA           LA   PUBLIC

            NICKEL TO QUARTER SIZE HAIL REPORTED BY
            PUBLIC VIA NWS JACKSON NEAR THE INTERSECTION
            OF HWY 546 AND NEW NATCHITOCHES ROAD NEAR
            THE CADEVILLE COMMUNITY.

&&

20

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
814 PM CDT FRI APR 9 2021

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

1217 PM     HAIL             4 SW LINDALE            32.47N 95.46W
04/09/2021  E0.88 INCH       SMITH              TX   TRAINED SPOTTER

            NICKEL SIZE HAIL REPORTED IN THE HIDEAWAY
            COMMUNITY.

&&

20

Special Weather Statement
National Weather Service Shreveport LA
833 PM CDT Fri Apr 9 2021

ARZ072-073-LAZ003>006-012-100215-
Union AR-Columbia AR-Bienville LA-Lincoln LA-Union LA-Claiborne LA-
Webster LA-
833 PM CDT Fri Apr 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR UNION AND SOUTHEASTERN COLUMBIA
COUNTIES...WEBSTER...NORTHWESTERN UNION...CLAIBORNE...NORTHWESTERN
BIENVILLE AND NORTHWESTERN LINCOLN PARISHES UNTIL 915 PM CDT...

At 831 PM CDT, Doppler radar was tracking strong south to southeast
winds gusting up to 50 mph in areas lacking thunderstorms north of
storms to the south. These winds will be capable of downing large
limbs and uprooting weakly rooted trees.

Locations impacted include...
El Dorado, Minden, Homer, Smackover, Norphlet, Huttig, Junction City,
Arcadia, Haynesville, Bernice, Sibley, Cotton Valley, Gibsland,
Doyline, Strong, Calion, Dixie Inn, Dubberly, Heflin and Shongaloo.

LAT...LON 3251 9300 3236 9340 3238 9343 3241 9337
      3241 9344 3282 9346 3339 9276 3336 9268
      3337 9255 3327 9244 3330 9236 3326 9232
      3328 9230 3325 9222 3321 9222 3321 9218
      3316 9217 3316 9211 3309 9213 3302 9208
TIME...MOT...LOC 0131Z 138DEG 24KT 3317 9254 3255 9338

50

Special Weather Statement
National Weather Service Shreveport LA
836 PM CDT Fri Apr 9 2021

LAZ001-002-010-011-TXZ151-153-100230-
De Soto LA-Bossier LA-Red River LA-Caddo LA-Panola TX-Shelby TX-
836 PM CDT Fri Apr 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN DE SOTO...NORTHWESTERN
RED RIVER...SOUTHERN CADDO AND SOUTHEASTERN BOSSIER PARISHES...PANOLA
AND NORTHWESTERN SHELBY COUNTIES UNTIL 930 PM CDT...

At 835 PM CDT, Doppler radar was tracking strong south to southeast
winds gusting up to 50 mph in rain free air north of storms to the
south. These winds will be capable of downing large limbs and
uprooting weakly rooted trees.

Locations impacted include...
Shreveport, Bossier City, Carthage, Center, Haughton, Stonewall,
Logansport, Tenaha, Timpson, Joaquin, Eastwood, Fosters, Gary City,
Keachi, Grand Cane, Longstreet, Stanley, Keat Chie, Curtis and Front.

LAT...LON 3208 9457 3265 9345 3241 9344 3241 9340
      3239 9340 3240 9342 3238 9343 3237 9340
      3231 9343 3228 9341 3224 9342 3224 9341
      3165 9433
TIME...MOT...LOC 0135Z 167DEG 32KT 3241 9355 3178 9436

50