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FXUS65 KRIW 242142
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
342 PM MDT Thu May 24 2018

.SHORT TERM...This evening through Sunday
Issued at 129 PM MDT Thu May 24 2018

A weak high pressure ridge with southwest flow aloft over the area
will limit moisture and instability supporting isolated to widely
scattered showers and thunderstorms mainly over the mountains this
evening and again on Friday. As a Pacific low pressure trough off
of the west coast of California and the Pacific Northwest shifts
slowly east inland, moisture and instability will increase in the
southwest flow Saturday bringing an increase in showers and
thunderstorms. Temperatures will warm through late day Saturday
and then begin to cool Saturday night. As the trough continues
to move east towards western and central Wyoming Saturday night
and Sunday, Showers will become more widespread with embedded
isolated thunderstorms. Areas of heavy precipitation will likely
occur being highly terrain influenced in distribution.

.LONG TERM...Sunday night through Thursday
Issued at 129 PM MDT Thu May 24 2018

The upper level low over Northern Utah will eject to the northeast
Sunday night into Monday. Medium-range models show a heavier band
of precipitation moving north into Montana and NW Wyoming Sunday
night. Another round of showers and thunderstorms is expected to
blossom over the area Monday afternoon and evening, possibly
continuing well into Monday night as the main upper low over the
Great Basin begins to lift out across the area. Heavier, more
organized precipitation should be mostly east of the area over the
northern and central plains on Tuesday with chances of showers
and thunderstorms lingering mostly over the west and north.

An active weather pattern looks to close out the month of May, as
next Pacific storm system will move onto the northwest coast on
Wednesday, and into the Intermountain West/northern Rockies on
Thursday. Accounting for models typical fast bias, most areas east
of the Divide should see a break in precipitation on Wednesday,
with chances of showers and thunderstorms returning on Thursday.
The western mountains will continue to see chances of showers and
thunderstorms through the extended period.

&&

.AVIATION...For the 00Z TAFS through 00Z Friday afternoon
Issued at 342 PM MDT Thu May 24 2018

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

Isolated showers and storms will continue through 03Z Fri. Local
MVFR conditions will occur with thunderstorms along with wind gusts
up to 30 knots. Mountains will be obscured at times.

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

Isolated shower or storms will continue through 03Z Fri. Local MVFR
conditions will occur with thunderstorms along with wind gusts up to
30 knots. Mountains will be obscured at times.

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 129 PM MDT Thu May 24 2018

A weak high pressure ridge with southwest flow aloft over the area
will limit moisture and instability supporting isolated to widely
scattered showers and thunderstorms mainly over the mountains this
evening and again on Friday. As a Pacific low pressure trough off
of the west coast of California and the Pacific Northwest shifts
slowly east inland, moisture and instability will increase in the
southwest flow Saturday bringing an increase in showers and
thunderstorms. Temperatures will warm through late day Saturday
and then begin to cool Saturday night. As the trough continues
to move east towards western and central Wyoming Saturday night
and Sunday, Showers will become more widespread with embedded
isolated thunderstorms. Areas of heavy precipitation will likely
occur being highly terrain influenced in distribution.

&&

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

$$

SHORT TERM...Baker
LONG TERM...Hulme
AVIATION...Hulme
FIRE WEATHER...Baker
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