Area Forecast Discussion
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
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890 FXUS65 KRIW 301055 AFDRIW Area Forecast Discussion National Weather Service Riverton WY 455 AM MDT Thu May 30 2024 .KEY MESSAGES... - The end of the week looks dry and a bit cooler in the wake of Wednesday`s system. Then, slight chances for thunderstorms Saturday, Sunday, and Monday. None of these days looks like a significant convective day, though. - A warmup will occur this weekend and it will be warm to hot across the area into next week any beyond. This will lead to rapid mountain snowmelt, especially next week, so river flooding will be a concern. - Long-range model guidance continues to indicate a hot and dry period beginning late next week as a dominant ridge sets up over the western US. It wouldn`t be surprising if several lower elevations hit 90 degrees F. && .DISCUSSION... Issued at 1257 AM MDT Thu May 30 2024 In the wake of Wednesday`s system it will be cooler today and tomorrow, but still mild with highs in the 60s and 70s. Another slight chance (20-30%) of rain showers/thunderstorms this weekend into Monday as another quick moving shortwave and an upper-low will slide through the Cowboy State. Minor river flooding is possible (30- 40%) as we head into next week, with warming temperatures on the way. The weather systems this weekend into next week will all be quick moving and weak, so not expecting big precip makers or highly impactful weather into next week. It will be fairly breezy for most locations each afternoon well into next week before a highly amplified ridge builds across the western US. The breezy conditions, combined with low RH will lead to elevated fire weather conditions late this week through this weekend, although greenup will limit this threat. Timing of the development of an amplified ridge that model guidance was indicating for next week remains uncertain as model guidance is struggling to come into agreement, but it will be sometime next week. Regardless of the active pattern temperatures will not drop much this weekend into next week as each trough/shortwave should stay on the northern edge of the area as they pass through the region. && .AVIATION /12Z TAFS THROUGH 12Z FRIDAY/... Issued at 444 AM MDT Thu May 30 2024 VFR conditions expected for the entirety of the period for all TAF sites. Light winds and some mid level clouds to start the period. Increasing winds up to 18-25kts after 16-18Z with daytime heating and strongest mixing to the surface. A stationary boundary will continue to drape across the Divide with increasing mid level clouds for points to the east after 01-03Z. Winds will decrease after this point as well due to radiational cooling expected to be at or below 10kts for the rest of the period. No other weather elements are expected at this time. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on icing and turbulence forecasts. && .RIW WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...Rowe AVIATION...Lowe