Special Weather Statement, NWS Shreveport, LA

Area Forecast Discussion
National Weather Service Shreveport LA
908 PM CDT Thu Mar 14 2024

...New UPDATE...

.UPDATE...
Issued at 853 PM CDT Thu Mar 14 2024

Tornado Watch #45 remains in effect until Midnight and through
that time, it appears that only our far northwest counties in
Northeast Texas, McCurtain County in Southeast Oklahoma and the
adjacent counties in Southwest Arkansas will see that large hail,
damaging wind and isolated tornado threat through watch expiration
time. For the update, we are following the HRRR output which has
really handled the isolated to scattered nature of the evening
convection north and west of the I-30 Corridor well thus far.
Having said that, storm mode after midnight should become more
linear in nature with embedded supercell thunderstorms as the
storms get closer to the I-30 Corridor and eventually towards the
I-20 Corridor of NE TX into far NW LA in the 09z-12z timeframe.
Will continue to mention the severe threat near and north of the
I-20 Corridor in NE TX and N LA through the remainder of the night
but did delay the expansion of higher pops from northwest to
southeast through the remainder of the night given the slow timing
to get the convection south and east thus far.

Believe the greatest tornado threat will remain across our far
northern zones through the duration of the overnight hours or
where Tornado Watch #45 continues through midnight. Further south
of the Tornado Watch which encompasses the I-20 Corridors of NE
TX and NW LA, the threat will be more of a damaging wind and large
hail threat. Obviously, the heavy rainfall threat will increase
overnight once the convection takes on more of a linear mode,
especially if we see any training after midnight.

Updated zones have been sent...13.

&&

.SHORT TERM...
(This evening through Friday Night)
Issued at 153 PM CDT Thu Mar 14 2024

By this evening, thunderstorms will be expand north of I-30, as
the main show for severe weather begins to get underway. An
enhanced risk for severe weather still remains in place, with a
slight risk extending down to the I-20 corridor. Not much has
changed with the overall thinking regarding this severe event.
Clusters of severe storms will meander along the front, before it
begins to move to the SE overnight. These clusters of storms will
be capable of producing damaging winds and very large hail, with
damaging winds becoming the primary threat once these storms form
into a line.

It also remains worth mentioning that the tornado threat continues
to appear "secondary" in nature, but that doesn't mean a tornado
or two won't occur. The last few days, it's appeared as if the
SFC-1km shear would really be lacking in the areas with the best
forcing, but morning observations had some pockets of better shear
farther north than expected. Now, it still looks like the truly
better shear values will remain south, but any local storm merger
or influence could be enough to get a storm over that hump.

From a flooding standpoint, it still looks like locally heavy
rainfall is possible in these same areas, as training
thunderstorms are possible during these same timeframe. The flash
flooding threat continues to look highly conditional, as multiple
rounds of heavy thunderstorms would have to occur in a short
window.

With all that being said, once the cold front begins to shift
south, severe weather chances will begin to wane into the early
morning hours Friday. This is not to say they will disappear
altogether, but chances will greatly begin to decrease the farther
south these storms get. A good chunk of the region will likely be
waking up to rain and thunder to start their day, with general
thunderstorm chances continuing into the afternoon hours,
particularly along and south of I-20.

/44/

&&

.LONG TERM...
(Saturday through next Wednesday)
Issued at 153 PM CDT Thu Mar 14 2024

With the surface front having moved through the region, the 850mb
front remains just north of the area. By Saturday, another
shortwave disturbance will part from the closed low continuing to
spin near California. This disturbance will ride the 850mb front,
allowing for another round of heavy showers and thunderstorms to
develop Saturday evening, and into the overnight hours. At this
time, no additional severe weather is anticipated, but a strong
storm during this timeframe is not out of the question. This will
be the last good soaking in the long-term, with half an inch to an
inch of rain possible in some areas during this time. The
elevated front will finally push through the region into Sunday,
which will allow for below average temperatures to return to the
forecast to start the new workweek. However, temperatures will
begin to rebound into the weekend, as flow across the region
begins to turn back towards the SW.

/44/

&&

.AVIATION...
(00Z TAFS)
Issued at 1245 PM CDT Thu Mar 14 2024

Widespread MVFR ceilings will eventually prevail overnight in
advance of convection that is expected to move south and east
through all but the LFK and MLU terminals through 12z Fri. Did
account for strong and gusts winds with convection and the
possibility of IFR ceilings with the convection through sunrise
and a little later in the mid to late morning hours in some
locations before we see ceiling improvement by late afternoon.

13

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  66  75  58  72 /  90  70  20  20
MLU  67  75  56  71 /  70  80  20  10
DEQ  59  69  48  71 /  90  20  10  10
TXK  63  70  52  70 /  90  30  20  10
ELD  63  71  51  71 /  90  50  10  10
TYR  65  71  58  70 /  90  30  20  30
GGG  65  73  58  71 /  90  40  20  20
LFK  68  78  62  74 /  60  90  30  40

&&

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

SHORT TERM...44
LONG TERM....44
AVIATION...20

Hazardous Weather Outlook
National Weather Service Shreveport LA
1149 AM CDT Thu Mar 14 2024

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-151700-
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-
1149 AM CDT Thu Mar 14 2024

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

.DAY ONE...This afternoon and tonight.

Thunderstorm chances will begin to increase into the afternoon, with
the threat for severe weather increasing into the evening and
overnight hours. All modes of severe weather will be possible, with
damaging winds and large hail being the primary threat. However, the
tornado threat appears to be increasing, as low-level wind shear
values look higher than previously anticipated. Flash flooding may
also become a concern, as thunderstorms look to train in some
locations into the overnight hours.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Severe thunderstorm chances may linger into Friday morning, before
chances diminish into general thunder. These rain chances will linger
into the weekend, before a cold front drys things out to start the
new workweek.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed.

44

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Special Weather Statement
National Weather Service Shreveport LA
1118 PM CDT Thu Mar 14 2024

OKZ077-TXZ096-150445-
McCurtain OK-Red River TX-
1118 PM CDT Thu Mar 14 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN MCCURTAIN AND
NORTHWESTERN RED RIVER COUNTIES THROUGH 1145 PM CDT...

At 1117 PM CDT, Doppler radar was tracking a strong thunderstorm near
Blossom, or 10 miles northeast of Paris, moving northeast at 45 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Idabel, Bagwell, Manchester, Valliant, Detroit, Deport, Millerton,
Garvin, Farmers Hill, Rufe, Negley, Woodland, Redland, Silver City,
Kanawha, Kiomatia, Slim, and Albion.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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.

A Tornado Watch remains in effect until midnight CDT for southeastern
Oklahoma...and northeastern Texas.

&&

LAT...LON 3388 9531 3387 9530 3388 9528 3391 9528
      3389 9526 3389 9525 3393 9525 3396 9523
      3394 9516 3415 9515 3390 9478 3349 9531
TIME...MOT...LOC 0417Z 217DEG 41KT 3373 9537

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

53

Special Weather Statement
National Weather Service Shreveport LA
1130 PM CDT Thu Mar 14 2024

ARZ051-150500-
Howard AR-
1130 PM CDT Thu Mar 14 2024

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN HOWARD COUNTY
THROUGH MIDNIGHT CDT...

At 1129 PM CDT, Doppler radar was tracking a strong thunderstorm over
Athens, or over Umpire, moving northeast at 45 mph.

HAZARD...Wind gusts up to 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Umpire, Athens, and Burg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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.

A Tornado Watch remains in effect until midnight CDT for southwestern
Arkansas.

&&

LAT...LON 3435 9394 3427 9394 3426 9392 3421 9392
      3417 9396 3418 9410 3419 9409 3419 9424
      3427 9424 3427 9426 3435 9426
TIME...MOT...LOC 0429Z 217DEG 41KT 3429 9407

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

53