375
FXUS64 KSHV 031831
AFDSHV

Area Forecast Discussion
National Weather Service Shreveport LA
131 PM CDT Fri May 3 2024

...New AVIATION...

.UPDATE...
Issued at 1153 AM CDT Fri May 3 2024

The last of the remnant MCS that moved ESE out of Oklahoma and
across Southern Arkansas is still in Northeast Louisiana but
should exit the area completely within the next few hours.
Convection is ongoing just south of the CWA in Southeast Texas and
Southern Louisiana along an outflow boundary. Latest radar loops
have indicated some northward redevelopment/movement on the
western flank, and this could move northward into East Texas
south of Interstate 20, and possibly Western Louisiana, later this
afternoon.

PoPs were edited somewhat based on these trends. The thick cloud
cover has also kept temperatures well in check across much of
Louisiana and Deep East Texas. Thus, high temps were lowered
across much of the area for today.

CN

&&

.SHORT TERM...
(Friday through Saturday)
Issued at 148 AM CDT Fri May 3 2024

Difficult forecast leads to a low confidence one in the short-
term as shortwaves embedded in dirty southwest flow aloft and a
myriad of convective outflow boundaries are resulting in havoc in
not only the operational deterministic progs but in the HighRes
CAMS as well. Best resort is to go with progs that have
initialized well to current activity which rules out most of the
deterministic progs and/or nearly half the CAMS.

The setup as described above is continued southwest flow aloft as
the longwave trough remains across southern Canada into the
Intermountain West with strong ridging off the Atlantic Seaboard.
This persistent ridging is making for a rather stagnant upper
pattern across the Southern Plains. The development of a nocturnal,
low level jet is helping to sustain convection across E OK
currently with that complex forecast to continue moving south and
east into our northern zones this morning, weakening as it does.
Outflow associated with this disturbance will likely serve as a
focus for renewed convection later today with plenty of diurnal
instability to work with. The HRRR which was followed closely for
this short-term forecast is picking up on an embedded disturbance
moving out of Central Texas later today with convection becoming
numerous mainly near but especially south of the I-20 Corridor of
NE TX and N LA so have therefore oriented pops highest across this
area through the daytime hours, limiting chance pops to our
northwest third overnight in the proximity of yet another weak
disturbance moving towards the I-30 Corridor overnight.

Saturday is another difficult call as our northern zones will likely
be dealing with remnant MCS convection with at least scattered
convection near and south of the I-20 Corridor once again tied
mostly to diurnal heating. The good news is that widespread severe
convection does not appear favorable today through Saturday but
damaging wind gusts an an isolated large hail producing
thunderstorm certainly cannot be ruled out given the relatively
steep mid-level lapse rates in place not to mention the
convective outflow potential. PWATS will remain highest across our
western half as well and relatively slow moving convection will
of course pose a flooding theat as well but again, this should not
be widespread through the short-term.

13

&&

.LONG TERM...
(Saturday Night through Friday)
Issued at 148 AM CDT Fri May 3 2024

By Saturday Night, all eyes will be on a much stronger shortwave
exiting the Tx Hill Country and moving into the Upper/Middle Red
River Valley of N TX/S OK. Scattered convection entering our far
northwest zones late Sat Night should become numerous across most
areas during the day Sunday and once again, these could pose an
isolated severe and/or flash flood threat during the day.

The East Coast ridge axis looks like it may finally pull up anchor
and head offshore to begin the upcoming work week. A vigorous
upper trough that enters to Pacific Northwest on Saturday moves
into the Intermountain West on Sunday and opens up into the
Southern and Central Plains for Monday. Enough upper forcing
should be present across or northern half for scattered convection
on Monday before we lose the upper level support for Tue into
Wed. Followed the NBM pop wise Wed thru Thu but WSW flow aloft
appears to continue and this results in a low confidence forecast
once again as the NBM is not spitting out much in the way of pops
Wed thru Thu and we all know what this flow can bring. NBM is
continuing it`s warming trend next week in the form of near 90 to
the lower 90s Wed into Thu and if the drying trend is correct,
this would put afternoon heat indices well into the 90s and even
approaching 100 degrees in some locations. Summer appears to be
starting way to early.

13

&&

.AVIATION...
(18Z TAFS)
Issued at 1248 PM CDT Fri May 3 2024

For the ArkLaTex terminals, we began the day w/ a TS outflow
sandwich from NtoS along I-20 w/ KMLU about to scatter in the
wake. The N boundary won out holding over E TX, but may go quick
gusting from the S now . We have a cluster of TS lifting toward
KLFK with a cautious tempo there 18-21Z. Otherwise, may add VCTS
to KTYR/KGGG/KSHV if the sea breeze joins in later today. We
should see a quiet night with IFR/MVFR 06-15Z and better TS
chances in the aftn hrs Sat & nocturnal again daybreak on Sun.
/24/


&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  80  68  85  69 /  50  20  50  30
MLU  78  65  85  67 /  70  20  30  30
DEQ  81  62  81  64 /  50  20  60  50
TXK  79  66  83  67 /  40  20  60  40
ELD  76  63  84  64 /  60  20  40  30
TYR  83  68  82  68 /  40  20  60  50
GGG  83  67  83  68 /  50  20  50  40
LFK  78  68  85  68 /  60  20  40  30

&&

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

$$

SHORT TERM...09
LONG TERM....13
AVIATION...24