983
FXUS64 KTSA 151837
AFDTSA

Area Forecast Discussion
National Weather Service Tulsa OK
137 PM CDT Sun Sep 15 2024

...New SHORT TERM, LONG TERM...

.SHORT TERM...
(Tonight and Monday)
Issued at 136 PM CDT Sun Sep 15 2024

As of early this afternoon, an H5 low, the remnants of Francine,
was centered over the Mississippi River on the border of AR and
MS. Deep layer moisture wrapping around the northern side of the
system will bring low rain/storm chances to portions of NW AR to
the east of I-49 this afternoon. After fading with the loss of
daytime heating, low rain/storm chances are expected to spread
farther west into the forecast area on Monday as a lobe of
vorticity and associated deep layer moisture continue to wrap
around the remnant low of Francine. For the forecast, will spread
low PoPs farther west than the NBM (blended consensus) per HREF
and CONSRaw forecasts.

Short-term guidance indicates that a band of early morning showers
and storms will form once again Monday morning along a mid-level
deformation zone, but most likely over central KS. Chances that
any of this activity will affect NE OK are too low to mention in
the forecast at this time.

Daytime highs on Monday should be a tick lower given closer
approach and influence from the upper low to the east.

Lacy

&&

.LONG TERM...
(Tuesday through Sunday)
Issued at 136 PM CDT Sun Sep 15 2024

A high-over-low split-flow or rex block is expected to persist
over the eastern CONUS thru the forecast period. A strong upper
trough is moving onshore the West Coast today, with ridging aloft
downstream over the High Plains. With time, this initial strong
shortwave trough will eject northeast toward the central/northern
Plains as ridging aloft shifts east and overhead and holds firm.
Models are not as optimistic today regarding chances for
rain/storms Tuesday night into Wednesday and PoPs have been
lowered. High temp forecast has trended upward Thursday and
Friday, with some places reaching the mid 90s, or about 10 degrees
above average for this time of year.

By next weekend, ensemble cluster data suggests that the western
CONUS trough will shift far enough east/northeast to place a
boundary close enough to force showers and storms into our area,
but lots of uncertainty remains. The brand new 12Z EC suggests
that a southern stream wave will eject out of the Southwest, but
it may be Sunday or even into Monday before substantial changes
occur, which is also similar to what the 12Z GFS has. The NBM
yielded slight chance to chance PoPs for next weekend, and see no
reason to change at this point. The current forecast highs are
cooler for Saturday, but that could get pushed back a day if the
current deterministic model runs hold.

Lacy

&&

.AVIATION...
(18Z TAFS)
Issued at 1235 PM CDT Sun Sep 15 2024

For eastern Oklahoma...VFR conditions are expected today and
tonight with mostly sunny skies and light easterly winds mostly 10
kts or less. Areas of low clouds in the 2-4 kft layer may develop
Monday morning, with a 10-20% of MVFR ceilings developing for a
few hours.

For northwest and west-central AR...SCT to occasionally BKN cloud
coverage will continue through the day in the 2.5-5 kft layer with
light east winds. There is a 10% of a shower for any of the
terminals this afternoon, but this is too low to include in the
TAFs. Low clouds and possibly areas of patchy fog will develop
again Monday morning, mostly in the 2-4 kft range.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   65  88  66  88 /   0   0   0   0
FSM   68  84  68  89 /   0  20  10   0
MLC   65  87  65  88 /   0   0   0   0
BVO   63  89  62  89 /   0   0   0   0
FYV   63  81  61  86 /   0  20  10   0
BYV   65  80  61  86 /  20  30  10   0
MKO   65  84  65  87 /   0  10   0   0
MIO   63  86  62  89 /   0  20   0   0
F10   64  86  64  87 /   0   0   0   0
HHW   66  87  66  86 /   0   0   0   0

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...None.
AR...None.
&&

$$

SHORT TERM...30
LONG TERM....30
AVIATION...06