398
FXUS64 KSHV 260519
AFDSHV

Area Forecast Discussion
National Weather Service Shreveport LA
1219 AM CDT Thu Sep 26 2024

...New AVIATION...

.UPDATE...
Issued at 918 PM CDT Wed Sep 25 2024

A shallow, yet cooler airmass continues to build into the Four
State Region tonight following the passing of a recent surface
cold front. This will only be further enhanced by clearing skies
overnight and radiational cooling as a result. Because of this,
and with no real push from the evening guidance to prove
otherwise, sticking with the advertised afternoon forecast package
thinking and therefore, not proposing any changes with the
evening update. Based on the details above, temperatures by
Thursday morning will range between the upper 50`s along I-30 and
north, with low and mid 60`s from Texarkana south.

KNAPP

&&

.SHORT TERM...
(This evening through Thursday Night)
Issued at 246 PM CDT Wed Sep 25 2024

As the pseudo-stationary frontal boundary draped across the ArkLaTex
finally begins to push south and east, it will take our persistent
cloud cover with it, along with the scattered chances of showers
and storms. Models have been somewhat inconsistent regarding the
exact timing of the frontal passage, specifically with regard to
whether or not we will see any further convective development this
afternoon, kicked up by the boundary as a forcing mechanism.
Continuing to carry slight chances for our southernmost zones
through early evening.

After 00Z tonight, PoPs drop to near negligible values, and quiet
and dry weather conditions will follow and should persist through
the day Thursday. Clouds look to dissipate as sunset approaches,
with mostly clear skies to follow and continue through Thursday.
The upper level trough responsible for swinging our cold front south
and east this week will deepen over the middle Mississippi
Valley as the week nears its end, to the point of forming a closed
low over eastern Arkansas and western Tennessee by Thursday.

With the cold front finally pushing completely out of the region,
its effects will be noticeable first in the form of cooler than
recent low temperatures to start the day tomorrow, ranging from the
upper 50s north to middle 60s south, followed by highs climbing only
into the low to mid 80s and remaining there for the foreseeable
future.

/26/

&&

.LONG TERM...
(Friday through next Tuesday)
Issued at 246 PM CDT Wed Sep 25 2024

While the upper level trough forms a large and deep closed low over
eastern Arkansas and western Tennessee, Hurricane Helene will be
approaching landfall along the Florida panhandle, likely during the
evening hours Thursday. Long-range forecast models have suggested
a Fujiwara effect resulting from their interaction as this week
comes to an end. Specifically, as Helene approaches land and
intensifies, its presence will help amplify the middle Mississippi
low upon approach. As Helene moves inland, it looks to get picked up
by the circulation surrounding the middle Mississippi low, and swung
around to the northwest over the Ohio Valley before ultimately
getting absorbed by the Mississippi low.

The effects of this pattern on ArkLaTex weather will take the form
of renewed showers and storms across our northern zones Friday,
swept in from the north on the western fringes of the upper level
closed low to our northeast. The latest PoP grids keep this activity
mostly to the north of the I-20 corridor, with the possible
exception of some slight chances diving south towards Monroe and
Shreveport Friday afternoon. This activity looks to dissipate
quickly thereafter, lifting north and east Friday evening, with
quiet conditions to follow.

The vast closed low will lift far enough north and east to release
the ArkLaTex from its grasp by the start of the weekend, with dry
and quiet conditions prevailing through to the end of this extended
forecast period. High temperatures may manage to rebound into the
middle 80s but should not much exceed seasonable values,
continuing into next week, with lows remaining in the upper 50s to
lower 60s throughout.

/26/

&&

.AVIATION...
(06Z TAFS)
Issued at 1210 AM CDT Thu Sep 26 2024

For the 26/06z TAF update...Satellite imagery continues to show
generally clear skies across the region, only picking up on a few
high clouds lingering across deep east Texas. Nonetheless, SKC
will prevail through around 26/16z before some mid level clouds
around 5kt feet will be possible. Winds will be out of the north
to northeast and will generally be around or under 10 kts
throughout this period. /33/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  86  64  82  66 /   0   0  20  10
MLU  83  63  80  64 /   0   0  30  20
DEQ  83  59  80  60 /   0   0  30  10
TXK  84  61  81  63 /   0   0  30  10
ELD  82  60  77  61 /   0   0  40  20
TYR  86  61  84  63 /   0   0  10   0
GGG  84  60  82  62 /   0   0  10  10
LFK  85  61  85  63 /   0   0   0   0

&&

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

$$

SHORT TERM...26
LONG TERM....26
AVIATION...33