Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 260904
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
304 AM MDT Sun Jun 26 2022

.SHORT TERM...Today through Tuesday night
Issued at 300 AM MDT Sun Jun 26 2022

Mainly quiet weather should continue today as ridging continues to
build into Wyoming from the west. The cool air mass over the state
will modify somewhat today, so expect temperatures to average 5 to 10
degrees warmer than yesterday, but still below normal for the end of
June. Far southern Wyoming may be just close enough to some moisture
in Colorado to bring an isolated thunderstorm or two south of
Interstate 80, but this would be the exception as over 95 percent of
the area will see nothing.

Monday looks similar, with only isolated showers and storms
across mainly southern Wyoming. However, we will be turning the
heat up as temperatures climb to near to above normal levels as
thicknesses rise across the area. The warmer spots will likely see
high temperatures return to the 90s on this day.

The weather will begin to take a more active turn on Tuesday, as
the ridge begins to move to the east and a shortwave approaches
from west. The best forcing looks to remain over Montana. However,
with some moisture starting to move up the backside of the ridge
it will be close enough to touch off some isolated thunderstorms
across the western mountains. The shortwave may also be close
enough to increase the wind across portions of the area, and with
humidity falling into the teens, elevated fire weather will be a
possibility across portions of the area.

.LONG TERM...Wednesday through Saturday
Issued at 300 AM MDT Sun Jun 26 2022

The flow aloft will turn more southwesterly by Wednesday, as an
upper low over the PACNW fills and the ridge flattens as it moves
over the Upper Midwest. A trough and associated cold front from the
upper low will move over the area Wednesday afternoon and evening.
Thunderstorm chances will be possible ahead and along the front, as
a result, likely from Johnson County to Sweetwater County. Wednesday
will also be the windiest day across the CWA, as the jet moves back
over the region in accordance of the southwest flow aloft. Critical
fire weather conditions are also likely Wednesday afternoon ahead of
the front. Flat ridging remains over the state Thursday.
Thunderstorm activity looks to be suppressed across the south, in
the wake of the cold front. Temperatures will be slightly cooler,
with elevated fire weather conditions continuing. A ridge begins to
rebuild over western Wyoming Friday, partly due to a Hudson Bay Low.
with isolated to widely scattered afternoon and evening
thunderstorms possible. The ridge will remain in place Saturday,
with afternoon and evening thunderstorms remaining possible.

&&

.AVIATION...For the 06Z TAFS through 06Z Monday
Issued at 1020 PM MDT Sat Jun 25 2022

VFR conditions will occur through the period. KRKS will see a gusty
northeast wind until 11Z. Otherwise wind speeds will be 10 knots or
less for most of the terminal sites through the period.

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 300 AM MDT Sun Jun 26 2022

Expect a dry and warmer day today with high pressure building into
the area. Any shower or thunderstorms will be isolated and more than
likely limited to areas south of Interstate 80. Wind should remain
light to moderate except in and around any shower or thunderstorm.
Relative humidity should remain above critical levels, although it
may fall into the upper teens at times across portions of Sweetwater
and Lincoln counties. Mixing and smoke dispersal will range from
fair across the northern basins to good to very good across
southern Wyoming. Above normal temperatures will return to the
area for Monday and Tuesday with elevated fire weather possible on
Tuesday.

&&

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

$$

SHORT TERM...Hattings
LONG TERM...LaVoie
AVIATION...AR
FIRE WEATHER...Hattings


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