606
FXUS64 KOUN 211714
AFDOUN

Area Forecast Discussion
National Weather Service Norman OK
1214 PM CDT Fri Aug 21 2026

...New AVIATION...

.KEY MESSAGES...
Updated at 125 AM CDT Fri Aug 21 2026

- Excessive heat continues through the weekend and into next week.

- Isolated rain/storms are possible most days.

&&

.NEAR TERM...
(Through Friday)
Issued at 125 AM CDT Fri Aug 21 2026

The weak surface boundary from northwest Oklahoma southeast toward I-
40 will continue to move slowly south through the night. As this
occurs southwest/westerly flow in the lower/mid levels will result
in the development of some warm air advection. This waa will aid in
a few high based showers/storms possibly developing across our
northeast counties and then sliding south and east toward morning.
Other isolated activity will be possible farther west.

Some this activity may linger into the morning hours before
dissipating. Then additional isolated storms may redevelop late
today and this evening across southeast Oklahoma.

Elsewhere, the heat, unfortunately, will be the story once again.
After some morning clouds expect abundant insolation from mid-
morning through the afternoon. Highs will once again be in the
triple digits with some spots in southwest Oklahoma and western
north Texas topping 110. Heat headlines will continue today across a
majority of Oklahoma and western north Texas.

In addition, even with lighter winds, the combination of excessive
heat, low afternoon humidity, extremely stressed vegetation and
drought will result in easily induced fire starts again today. Be
careful with any potential heat source which may aid in starting
wildfires.

&&

.SHORT TERM...
(Friday night through Sunday night)
Issued at 125 AM CDT Fri Aug 21 2026

Some late day and evening showers and thunderstorms will be possible
as a minor disturbance drops south and southwest across eastern and
southeastern Oklahoma. Later in the overnight period an area of waa
may again assist in a few showers and thunderstorms developing,
again mainly across far eastern part of the area. Much like Friday,
a residual boundary along with daytime heating may result in late
day convection Saturday, this time mainly along and south of I-40.

Some slightly cooler temperatures may slide into north central
Oklahoma (highs in the upper 90s). Otherwise another day with triple
digit heat, heat indices and likely more headlines for Saturday.

Sunday looks to remain dry as the upper ridge keeps shortwave well
to our north and any associated convection relegated well to our
north and east. However this shortwave will bring a weak front into
the northeast quarter to a third of the state with portions of north
central possibly only climbing into the middle and upper 90s Sunday
afternoon. Very hot conditions will continue farther south. A few
overnight showers will be possible near the boundary Sunday night.

&&

.LONG TERM...
(Monday through Thursday)
Issued at 125 AM CDT Fri Aug 21 2026

As we go throughout the upcoming week, the upper ridge slowly
retrogrades back westward. Even by Monday this will allow a more
northwest mid-level flow, although weak, to develop across the
Southern Plains. Do not anticipate any big changes Monday or Tuesday
with another couple of days with near record heat. Although an
isolated late day storm can not be ruled out.

As we go into Tuesday night, a stronger shortwave drops southeast
out of the central Rockies and into Oklahoma, bringing a better
chance of rain to portions of Oklahoma and western north Texas.
Currently we have 20-40% chance of precip, best across northwest
Oklahoma. Hopefully these increase as we get closer, but I don`t
want to get too optimistic at this point.

In the wake of what we hope is some precip, some cooler air slides
into parts of the area with temperatures in the 90s along and north
of I-40 Wednesday and Thursday.

&&

.AVIATION...
(18Z TAFS)
Issued at 1214 PM CDT Fri Aug 21 2026

Ongoing scattered precipitation and the southwest passage of
consolidated outflow are creating changeable sky/wind/wx
conditions across the eastern two-thirds of Oklahoma and portions
of north Texas early this afternoon. Wind direction is expected
to continue shifting towards the south behind outflow through this
evening. Additional (low) storm chances are possible across
western Oklahoma after 20-21 UTC, yielding potential for gusty-
erratic winds at any impacted terminals.

Towards daybreak Saturday, another round of scattered rain and
storms is forecast near the I-35 corridor, moving from north-to-
south across the area through the end of the period.

Safe travels!

Ungar

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  98  77 104  76 /  20  20  30  10
Hobart OK        108  79 107  76 /   0  10  30  10
Wichita Falls TX 105  80 108  79 /   0  10  30  30
Gage OK          104  73  98  71 /  10   0   0  10
Ponca City OK     99  74  94  73 /  20  20  20  10
Durant OK         96  78 107  77 /  20  20  30  30

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...Heat Advisory until 9 PM CDT this evening for OKZ005>008-010>017-
     020>023-026-033>038.

     Extreme Heat Warning until 9 PM CDT this evening for OKZ018-019-
     024-025-027>032-039>048-050>052.

TX...Heat Advisory until 9 PM CDT this evening for TXZ083>089.

     Extreme Heat Warning until 9 PM CDT this evening for TXZ090.

&&

$$

NEAR TERM...30
SHORT TERM...30
LONG TERM....30
AVIATION...09