Area Forecast Discussion
Issued by NWS Riverton, WY

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885
FXUS65 KRIW 162336
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
530 PM MDT Wed Jun 16 2021

.SHORT TERM...(This evening through Thursday night)
Issued at 211 PM MDT Wed Jun 16 2021

The upper-level ridge that has been responsible for the record
setting heat will begin to flatten to more zonal flow behind a weak,
dry cold front that is slowly making its way through the area. As
the upper-level flow begins to flatten out, temperatures will
continue to decrease from yesterday`s records. By tomorrow
afternoon, we`ll see upper 80s to lower 90s while still remaining
dry. This does however, keep elevated to critical fire weather
conditions on the doorstep through the period. The above average
temperatures and below average precipitation trend looks to continue
into the long-term period. Also, have relayed from DEQ an air
quality alert for wildfire smoke moving down into the Bighorn
Basin and surrounding mountains.

.LONG TERM...(Friday through Wednesday)
Issued at 211 PM MDT Wed Jun 16 2021

A dry westerly flow is expected Friday. A trough is expected to pull
southeast out of southwest Canada across the northern Rockies
Saturday night and Sunday. The associated cold front is also
expected pull across the forecast area Saturday night into Sunday.
In wake of this cold front, there appears to be a decent chance of
precipitation east of the Divide especially on Sunday. This
precipitation is then expected to exit the area Sunday night. There
might be enough cold air with this system where the precipitation
above 8500 feet could be snow. Upper level ridging builds into the
region Tuesday and Wednesday with a return of very warm temperatures
and mainly dry conditions.

&&

.AVIATION...(For the 00Z TAFS through 00Z Friday)
Issued at 530 PM MDT Wed Jun 16 2021

East of the Divide...KCOD/KCPR/KLND/KRIW/KWRL Terminals

The main issue will be wildfire smoke impacting KCOD at times due to
northerly winds pushing smoke southward into the area. Although
surface visibility is expected P6SM through early evening and again
Thursday afternoon, the glide slope could see reductions in
visibility. MVFR visibilities at the surface could occur at times
later tonight into Thursday morning. The rest of the terminals will
be VFR through the TAF period. Breezy winds late this afternoon will
weaken this evening. Breezy westerly winds are expected to develop
around midday Thursday at KCPR, KLND and KRIW.

West of the Divide...KBPI/KJAC/KPNA/KRKS Terminals

VFR conditions with only some high clouds are expected through the
TAF period, with more cloud cover across southern WY. Breezy west-
southwest winds this afternoon will weaken this evening, but will
redevelop around midday Thursday.

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

&&

.FIRE WEATHER...
Issued AT 211 PM MDT Wed Jun 16 2021

A dry cold front has moved through the northern fire zones with
brief relief in temperatures and little improvement in minimum
relative humidity. A strong, westerly wind this afternoon, mainly in
the southern zones could exceed elevated to critical fire weather
conditions. High pressure is expected to remain over the area the
next several days with the potential for another cold front Saturday
night into Sunday.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

$$

SHORT TERM...Vorst
LONG TERM...Murrell
AVIATION...Murrell/McDonald
FIRE WEATHER...Vorst



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