Special Weather Statement, NWS Shreveport, LA

Area Forecast Discussion
National Weather Service Shreveport LA
1235 PM CDT Fri Apr 16 2021

.AVIATION...

For the 16/18z TAFs...Showers and thunderstorms continue to move
across much of the area early this afternoon and will continue to
do so through the remainder of the day and into the overnight
hours. As such, widespread MVFR/IFR and occasional LIFR conditions
are being seen from both lower cigs and vis. A few of the stronger
storms will be capable of producing some marginally severe hail
and possibly some stronger gusts at times. Winds will generally
remain near or under 10 kts through this afternoon across the
area. /33/

&&

.PREV DISCUSSION... /issued 1109 AM CDT Fri Apr 16 2021/

UPDATE...

Currently watching a large area of moderate to heavy showers and
thunderstorms moving through the area. Expecting this trend to
continue through the much of the day with only small breaks here
and there. There remains a non zero threat for a strong to
marginally severe storm to develop, mainly across portion of east
Texas and central Louisiana. The moderate to heavy rain could
lead to some localized flooding, however, thinking the area should
be able to handle the rain for the most part. Other than some
minor changes to PoPs to account for current trends, no other
changes were made at this time. /33/

PREV DISCUSSION... /issued 356 AM CDT Fri Apr 16 2021/

SHORT TERM.../Today through Saturday/

Scattered elevated convection, some of it strong at times, is
ongoing south of the Interstate 20 corridor. Increasing large
scale ascent from an upper trough moving through Kansas combined
with strong isentropic ascent along an inverted surface trough
should result in a large area of showers and thunderstorms
developing across Oklahoma and North Texas shortly after sunrise.
This next round of rain will also gradually move east-southeast
across the forecast area. More showers and thunderstorms should
develop across East Texas and Louisiana, basically where
convection is already ongoing, late this afternoon and tonight.

The upper trough over Kansas will be relatively slow moving and a
strong mid- and low-level jet will help to maintain large scale
ascent. Showers and thunderstorms will likely affect some
portions of the area from now until Saturday morning. The
convection that develops south of Interstate 20 late this
afternoon and tonight is still expected to be elevated, but
there will be enough deep layer shear and instability aloft to
support an isolated risk for marginally severe hail and damaging
winds. In addition, locally heavy rainfall will be possible at
times, which could lead to isolated flooding, especially across
Deep East Texas eastward into Central Louisiana.

The showers and thunderstorms should slowly begin to diminish from
northwest to southeast this evening as the inverted surface trough
moves across the region allowing winds to become northerly, which
should advect some drier air into the forecast area. With a
relatively dirty zonal flow aloft and a surface front across
Southeast Louisiana, a few lingering showers will be possible
during the day Saturday across La Salle and Grant Parishes but
only slight chance PoPs were mentioned, and the vast majority of
the forecast area should be dry.

CN

LONG TERM.../Saturday Night through Thursday Night/

The weekend ends and the new work week begins as we remain cool in
the mornings with air temperatures running a bit below average
mostly in the 40s. Our afternoon highs all week are looking at upper
60s and low to mid 70s, which is just a bit below average for mid to
late April. Clouds will be in and out, but little if any rainfall
can be found in the long term.

Surface high pressure(s) will be dominant for much of the week
providing more northerly component than southerly. Meanwhile, the
pattern aloft will be under the influence of a more or less zonal
flow from West to East giving way to lots of sunshine, but an
increase in the clouds and slightly warmer air will be the case on
Tuesday. An persistent omega block on the west coast keep the
longwave trough locked in over much of the country for the week
ahead with minor short waves in the pattern avoiding the ArkLaTex
for the most part.

The one air mass over the weekend finally drifts to our East into
Monday. Then we will see a second air mass of 1028mb arriving late
on Tuesday with little moisture return and mainly a brief flare up
of cloudiness and little if any rainfall. Then this new high
pressure system will be with us through the end of this long tern
package, but with southerly winds returning in earnest on Friday and
then moisture quickly piling up ahead our next major rain event for
next weekend Friday into Saturday. /24/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  65  52  66  47 /  90  70   0  10
MLU  64  54  68  48 /  80  90  10  10
DEQ  58  47  65  43 /  90  50   0   0
TXK  60  50  64  46 / 100  60   0  10
ELD  60  50  66  44 /  90  80   0  10
TYR  65  50  63  45 / 100  40  10  10
GGG  62  51  65  44 /  90  60   0  10
LFK  67  54  66  47 /  80  70  10  10

&&

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

09/24/33

Hazardous Weather Outlook
National Weather Service Shreveport LA
606 AM CDT Fri Apr 16 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>167-171115-
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-
606 AM CDT Fri Apr 16 2021

This Hazardous Weather Outlook is for southern Arkansas, for
northern Louisiana, for eastern Texas and southeast Oklahoma.

.DAY ONE...Today and Tonight...

Showers and thunderstorms will be ongoing today ahead of an
approaching upper level disturbance with a surface low and a cold
front this evening. A few strong storms containing hail cannot be
ruled out along with some isolated areas of flooding possible as
storms train over the same areas, especially south of I-20.
No other hazardous weather is expected.

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

Cooler and drier weather is expected for the rest of the weekend
into the start of the new work week with arriving high pressure.
Another reinforcing cool front will arrive late on Tuesday with
limited moisture allowing for lesser amounts of rainfall.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel, amateur radio
operators and storm spotters should not be needed through
tonight.

24

Special Weather Statement
National Weather Service Shreveport LA
1031 AM CDT Fri Apr 16 2021

TXZ149-161615-
Cherokee TX-
1031 AM CDT Fri Apr 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CHEROKEE COUNTY UNTIL
1115 AM CDT...

At 1031 AM CDT, Doppler radar was tracking a strong thunderstorm 10
miles northeast of Palestine, moving east at 45 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Jacksonville, Rusk, Alto, Morrill, Ponta, Maydelle, Gallatin and
Reklaw.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3199 9545 3192 9499 3186 9498 3157 9505
      3167 9529 3170 9531 3172 9534 3174 9533
      3173 9537 3175 9536 3176 9540 3182 9540
      3184 9542 3185 9544 3188 9543 3190 9544
      3193 9542 3196 9545
TIME...MOT...LOC 1531Z 284DEG 38KT 3189 9556

33

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Special Weather Statement
National Weather Service Shreveport LA
1208 PM CDT Fri Apr 16 2021

LAZ010-TXZ151-153-161800-
De Soto LA-Panola TX-Shelby TX-
1208 PM CDT Fri Apr 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN DE SOTO PARISH...
SOUTHEASTERN PANOLA AND NORTHERN SHELBY COUNTIES UNTIL 100 PM CDT...

At 1207 PM CDT, Doppler radar was tracking a strong thunderstorm over
Timpson, or 17 miles northwest of Center, moving east at 45 mph.

Penny size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Logansport, Tenaha, Timpson, Joaquin, Huxley, Stanley, James and
Paxton.

LAT...LON 3184 9445 3186 9446 3187 9446 3188 9448
      3190 9448 3191 9450 3192 9451 3200 9451
      3204 9389 3180 9388
TIME...MOT...LOC 1707Z 269DEG 37KT 3190 9445

19

Special Weather Statement
National Weather Service Shreveport LA
1251 PM CDT Fri Apr 16 2021

LAZ010-011-161845-
De Soto LA-Red River LA-
1251 PM CDT Fri Apr 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL DE SOTO AND CENTRAL RED
RIVER PARISHES UNTIL 145 PM CDT...

At 1250 PM CDT, Doppler radar was tracking a strong thunderstorm over
Logansport, or 14 miles west of Mansfield, moving east at 45 mph.

Penny size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Mansfield, Coushatta, South Mansfield, Grand Cane, Edgefield,
Longstreet, Stanley, Carmel, Evelyn, Grand Bayou, Loggy Bayou,
Crichton and Armistead.

LAT...LON 3209 9400 3224 9340 3224 9335 3199 9328
      3191 9395
TIME...MOT...LOC 1750Z 255DEG 37KT 3199 9395

19

Special Weather Statement
National Weather Service Shreveport LA
146 PM CDT Fri Apr 16 2021

LAZ010-017-018-161930-
De Soto LA-Natchitoches LA-Sabine LA-
146 PM CDT Fri Apr 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL DE SOTO...
SOUTHWESTERN NATCHITOCHES AND NORTHERN SABINE PARISHES UNTIL 230 PM
CDT...

At 146 PM CDT, Doppler radar was tracking a strong thunderstorm over
Converse, or 20 miles south of Mansfield, moving east at 45 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Many, Zwolle, Converse, Oak Grove, Pleasant Hill, Provencal, Noble,
Robeline, Belmont, Pelican, Toledo Bend Reservoir North, Marthaville
and Hagewood.

LAT...LON 3165 9382 3168 9382 3169 9380 3170 9380
      3170 9381 3192 9373 3177 9316 3149 9324
TIME...MOT...LOC 1846Z 286DEG 39KT 3174 9371

13