-- Discussion containing changed information from previous version are highlighted. --
155
FXUS64 KSHV 181525
AFDSHV

Area Forecast Discussion
National Weather Service Shreveport LA
1025 AM CDT Tue Jun 18 2024

...New UPDATE...

.UPDATE...
-- Changed Discussion --
Issued at 1021 AM CDT Tue Jun 18 2024

As of 10:30 AM, temperatures are approaching the mid-80s with
mostly cloudy skies and southeasterly winds. Afternoon
temperatures will reach the lower 90s with onshore convection
expected to develop and propagate into the area through the
evening. With weather and observed trends continuing as
anticipated, forecast grid adjustments were not necessary at this
time. /16/
-- End Changed Discussion --

&&

.SHORT TERM...
(Tuesday through Wednesday)
Issued at 353 AM CDT Tue Jun 18 2024

Thunderstorms associated with an area of low pressure, labeled as
Potential Tropical Cyclone One (PTC One), continues to support an
impressive northward advecting moisture channel into the Ark-La-
Tex this morning. At the same time, regional radar imagery
advertises weak reflectivity returns, increasing in coverage,
across much of southern and eastern Louisiana. While there is
little ground truth that precip is falling at this time, not
ruling out light showers through the early morning just yet.

Confidence in convective coverage continues to be focused around
the afternoon period as better daytime heating evolves. Given that
temperatures over performed yesterday under ample cloud coverage,
elected to bump MaxT`s a degree or two above the base NBM output.
Again, highs in the upper 80`s to low 90`s are expected. Obviously,
any rain cooling that occurs this morning and prior to peak
daytime heating will delay afternoon heating potential.

By Wednesday morning, guidance suggests that PTC One will be
somewhat better organized when compared to it`s current state, and
tracking off to the WNW, coming onshore in NE Mexico by the late
evening, possibly overnight Wednesday into Thursday AM. As this is
occurring, upper-ridging present over the eastern CONUS will
strengthen and expand, influencing the Ark-La-Tex as it gradually
displaces the rich tropical moisture to the west, replacing it with
a drier atmospheric column aloft. This will shift the rain focus
towards east Texas through Wednesday afternoon, with the highest
confidence in respectable measurable precip being located across
Deep East Texas.

It is worth mentioning however that the track of PTC One has
shifted south from run to run, and with it, the axis of tropical
moisture and QPF response. As a result, it is possible that the
afternoon package could see a further decrease in PoPs across the
region Wednesday afternoon. By Wednesday evening, rainfall will
be little to none as we head into the overnight.

RK

&&

.LONG TERM...
(Wednesday Night through Tuesday)
Issued at 353 AM CDT Tue Jun 18 2024

Heights aloft will continue to increase from east to west across the
Ark-La-Tex on Thursday, as the upper-ridge expands. Guidance
advertises as 597-598 dam ridge across the Tennessee Valley by
Thursday afternoon. Under the influence of the ridge, rain chances
will be non-existent as temperatures quickly rebound back in to
the mid 90`s, possibly warmer. Temperatures will only continue to
climb through the end of the week and heading in to the weekend as
rain chances will be trapped along the Louisiana coastline.

For now, upper 90`s look to make a return to the region through the
weekend, and possibly as deep as early next week. By Saturday, the
previously mentioned easterly sfc winds will become more southerly,
reintroducing GOM moisture. Given that temperatures will approach
the upper 90`s, and the increase of area dew points via gulf
moisture advection, it is becoming increasingly likely that heat
products will be needed in the coming days. Given drier than
expected conditions over the last several days, and an extended
dry period to end the week, it is possible temperatures may be
higher than the currently advertised values. Be sure to monitor
the forecast through the week for updates.

RK

&&

.AVIATION...
(12Z TAFS)
Issued at 551 AM CDT Tue Jun 18 2024

MVFR/IFR ceilings currently prevailing across the western half of
our airspace with VFR conditions prevailing across our extreme
east. Very light rain falling out of AC deck over near the MLU
terminal attm. As we go through the day, look for MVFR/IFR
ceilings to lift and or scatter out. Continued to go with VCTS for
terminals along and south of the I-20 Corridor, mainly by late
this afternoon into the evening hours. Any convection should
dissipate late this evening.

13

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  90  76  90  77 /  20  20  20   0
MLU  86  73  91  72 /  20  20  10   0
DEQ  90  70  86  71 /  20  10  10   0
TXK  91  73  89  73 /  20  10  10   0
ELD  87  70  88  70 /  20  10  10   0
TYR  92  73  86  74 /  10  20  30  10
GGG  91  73  86  74 /  20  20  20  10
LFK  88  73  86  74 /  30  30  40  10

&&

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

$$

SHORT TERM...16
LONG TERM....16
AVIATION...13