186
FXUS65 KRIW 021118
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
518 AM MDT Tue Jun 2 2026

.KEY MESSAGES...

- Mostly sunny skies again today for most of the region, with
  highs in the 70s and 80s. An isolated shower or thunderstorms
  (under 20%) is possible for eastern Sweetwater and Natrona
  Counties late this afternoon.

- Warming trend continues the rest of the week into the upcoming
  weekend with highs in the 70s and 80s. Temperatures Saturday
  may reach the lower 90s east of the Divide.

- Warm and dry conditions will bring elevated to near critical
  fire weather concerns through the rest of the week. Humidity
  readings of 8 to 15% with afternoon wind gusts of 15 to 25
  mph.

&&

.DISCUSSION...
Issued at 209 AM MDT Tue Jun 2 2026

The meandering trough continues to spin along the MT/Canada
border this morning, and will bring another weak shortwave
around the south side during the day today. Light showers are
already moving across greater Sweetwater County, sweeping to
the northeast. Current timing for this trough is late morning
into early afternoon, which will put most of the energy with the
wave into NE WY during peak heating this afternoon. So the
current band of showers will remain fairly weak with minimal
accumulations into the early afternoon, and likely won`t
strengthen until after they reach NE WY. The remainder of
western and central Wyoming will continue with mostly sunny
skies and temperatures again reaching the 70s and 80s. With
some wind gusts reaching 15 to 25 mph today, there will be some
elevated fire weather concerns for lower elevations.

As this wave moves northeast tonight, weak ridging will build
into western WY overnight, keeping things more stable during the
day Wednesday. Skies will be mostly sunny again, with most areas
seeing highs in the 80s.

Another shortwave moves mainly across Montana during the day
Thursday, which will be close enough to bring showers to far
northern WY Thursday afternoon. Stronger ridging builds Friday
into the weekend, with even warmer temperatures in the 80s,
with some 90 degree readings east of the Divide on Saturday.

&&

.AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/...
Issued at 514 AM MDT Tue Jun 2 2026

VFR conditions dominate the next 24 hours, with nearly clear
skies at all locations. There is still a low chance (~15%) for
a couple showers in the vicinity of KCPR during the late
afternoon, but cigs with those are still not expected to lower
significantly as they pass.

Main aviation threat for most sites today will be gusty west
winds. Winds will generally gust 20 to 25 knots this afternoon,
with highest gusts at KRKS and KCPR. All winds will relax during
the early evening.

&&

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

&&

$$

DISCUSSION...Straub
AVIATION...Straub