314
FXUS65 KRIW 242307
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
507 PM MDT Tue Sep 24 2024

.KEY MESSAGES...

- At or near record high temperatures expected the next several
  days.

- Elevated fire weather concerns Wednesday and Thursday with low
  humidity and locally gusty winds.

&&

.DISCUSSION...
Issued at 1259 PM MDT Tue Sep 24 2024

H5 ridging continues to dominate the weather across Wyoming
through the upcoming weekend. This will keep skies nearly clear
through Saturday, with non-autumn temperatures. H7 temperatures
still expected to be around 15C Wednesday through Friday, which
translates to a sfc temperature range of mid 80s to low 90s for
lower elevations east of the Divide, low 80s for lower
elevations west of the Divide, and lower 70s for higher
elevations. These higher temperatures will contribute to
slightly elevated fire weather concerns the rest of the week,
with humidity levels generally falling to around 15 percent each
afternoon. Winds tomorrow will be marginally concerning, with
sustained winds above 15 mph only for greater Johnson and
Natrona Counties, and are not currently expected to last for a
full 3 hour period. Thus have opted not for a RFW at this time.
Thursday may be a better concern for fire weather, as winds will
be somewhat higher as a weak system passes to the north. More
frequent and widespread winds above 15 mph and frequent gusts
above 25 mph, especially from RKS to CPR to BYG.

Looking into this weekend, temps remain well above normal, but
as tempered slightly by increasing cloud cover from the next
approaching system. This system would not impact locally before
Monday, and models still in disagreement on how far south it
sweeps before moving east.

&&

.AVIATION /00Z TAFS THROUGH 00Z THURSDAY/...
Issued at 458 PM MDT Tue Sep 24 2024

VFR conditions expected throughout the period under high pressure
and a weak gradient. Light winds and clear skies overnight into
Wednesday morning. Winds will increase after 17Z at KCPR and
KRKS, then other locations after 18-19Z due to an increasing
gradient with a subtle wave to the north. Gusts up to 18-25kts
expected before diminishing after the end of the period
Wednesday evening towards sunset. Otherwise, no other weather
elements expected at this time.

Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for
the latest information on smoke, icing, and turbulence
forecasts.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION...Straub
AVIATION...Lowe/LaVoie