Severe Thunderstorm Warning 155, NWS Shreveport, LA

Area Forecast Discussion
National Weather Service Shreveport LA
646 PM CDT Sat Apr 15 2023

...New UPDATE...

.UPDATE...
Issued at 644 PM CDT Sat Apr 15 2023

Issued a quick update to remove 6 counties across northeast Texas
and southwest Arkansas from Severe Thunderstorm Watch number 140
as convective line continues to travel east into south Arkansas
and north Louisiana. /05/

&&

.UPDATE...
Issued at 619 PM CDT Sat Apr 15 2023

Ongoing convection is becoming linear with the primary severe
weather threat thus far being very large hail. Went ahead and
extended Severe Thunderstorm Watch number 140 to include the
remainder or our north Louisiana parishes that are downstream of
the convection. /05/

&&

.SHORT TERM...
(This evening through Sunday Night)
Issued at 251 PM CDT Sat Apr 15 2023

Severe weather threat to ramp up across mainly southwest Arkansas
into north Louisiana and deep east Texas late this afternoon.
This is in response to a sharp upper-level trough swinging east
across the Great Plains and interacting with a surface frontal
boundary currently across southeast Oklahoma into northeast
Texas. Rich dewpoint values in the upper 60s to lower 70s combined
with steeping lapse rates aided by diurnal heating will support
instability sufficient enough to erode the mid-level cap ahead of
the approaching frontal boundary. By the time the cap breaks,
convection is forecast to initiate across deep east Texas into
north Louisiana and southwest Arkansas. However, exact location of
when this will occur is somewhat uncertain with the possibility
that convection could initiate earlier in the afternoon to include
parts of northeast Texas and southeast Oklahoma.

Discrete deep layer thunderstorms capable of producing large hail
and damaging winds appear to be the short-term threat early in
the evening, evolving into a primary damaging wind threat as
convection becomes linear along the front this evening. Tornadoes
are are also possible but remain a slightly lesser threat.

Convection to exit the region to the southeast shortly after
midnight with northwest winds increasing to near 15 mph across
much of the region. Strongest winds will occur late in the evening
through around midnight just behind the convection with winds
diminishing to around 10 mph through the remainder of the night.

On Sunday, winds are forecast to again climb to around 10 to 15
mph with higher gusts. With northwest flow aloft prevailing
through the remainder of the short term, skies to remain mostly
clear. A cooler airmass will allow for high temperatures on Sunday
to average in the upper 60s to the lower 70s. Otherwise, stable
conditions to prevail on Sunday night with overnight lows in the
40s. /05/

&&

.LONG TERM...
(Monday through next Friday)
Issued at 251 PM CDT Sat Apr 15 2023

A 1022mb surface high will be right over SW LA and the work week
will have a chilly start in the 40s, but our lows will quickly
rebound with 50s on Tuesday and then 60s areawide during mid to late
work week. Most of the week ahead will see those warm southerly
winds blowing in off the Gulf.  Even our high temperatures on Monday
will edge back above the mid April averages near 80, despite the
below average start. Usually we see mid 50s for lows and mid 70s
during this part of April.

Our next cold front is looking like a mid to late morning passage on
Friday, bringing next weekend a bit of a below average cool down
once again to our region. The SPC is highlighting a potential risk
mainly over OK and AR on day 6 late Thursday into Friday morning.
This is when we may see the best frontal forcing from the tail end
of a deep low lifting into the midWest U.S.  We will see the morning
low clouds and then rain chances returning by midweek as a weak
surface low and tiny bubble high edge over the plains states.

We will have to wait for a much larger and reinforcing Canadian high
to spin up that deeper surface low moving into the midWest late in
the week. This is when we should see our best opportunity for April
(thunder)showers this week. This next big air mass, while quite
chilly, will keep much farther north and even pull up stationary a
leave the frontal boundary along our I-20 corridor. While it will be
cooler with north winds and lingering clouds, next weekend may also
see lingering rainfall nearby along this boundary. /24/

&&

.AVIATION...
(00Z TAFS)
Issued at 619 PM CDT Sat Apr 15 2023

A line of convection to move through MLU/ELD by 16/03Z with
conditions improving thereafter. Northwest winds to increase to up
to 15 knots across area terminals through 16/06Z, settling to
around 10 knots through the remainder of the overnight hours.
Winds to again increase to near 15 knots on Sunday. Otherwise, VFR
conditions to prevail areawide outside of this evenings convection.
/05/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  52  72  48  80 /  40   0   0   0
MLU  52  71  47  77 /  70   0   0   0
DEQ  46  70  43  79 /  20   0   0   0
TXK  49  71  46  81 /  30   0   0   0
ELD  48  70  45  78 /  60   0   0   0
TYR  50  72  48  79 /  20   0   0   0
GGG  50  71  47  79 /  20   0   0   0
LFK  52  73  47  79 /  40   0   0   0

&&

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

SHORT TERM...05
LONG TERM....24
AVIATION...05

Hazardous Weather Outlook...UPDATED
National Weather Service Shreveport LA
120 PM CDT Sat Apr 15 2023

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-161830-
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-
120 PM CDT Sat Apr 15 2023

This Hazardous Weather Outlook is for our four state area of southern
Arkansas, northern Louisiana, eastern Texas and southeast Oklahoma.

.DAY ONE...This afternoon and tonight.

Showers and thunderstorms will quickly develop ahead of a cold front
this afternoon and then continue sweeping eastward after sunset. The
air will remain unstable well into the evening hours with mid to
upper 80 highs today and any of these Thunderstorms could reach
severe limits. The Storm Prediction Center maintains the Enhanced
Risk for hail and damaging winds with the frontal timing across I-30
late this afternoon. This will focus potential development right over
southern Arkansas and northern Louisiana late today. Please see the
latest SPC graphics on our Facebook and Twitter pages or on our home
page at weather.gov/shv. Once again, large hail and damaging winds
will be the primary threats for us, but an isolated tornado cannot
be completely ruled out.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Dry conditions will settle in through the rest of the weekend and
into the start of next week. A series of systems will begin to move
into the region towards the middle of next week. Another round for
severe weather could be possible across portions of the area on
Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon or evening.

24

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
709 PM CDT SAT APR 15 2023

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

0509 PM     HAIL             3 NNE BARKSDALE AIR FOR 32.54N 93.67W
04/15/2023  E1.25 INCH       BOSSIER            LA   TRAINED SPOTTER

            LOTS OF QUARTER SIZE HAIL. A COUPLE JUST
            SMALLER THAN PING PONG BALL SIZE (~1.3”).
            ALL STONES LARGER THAN QUARTERS ARE PANCAKE
            SHAPED.

&&

16

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