621 FXUS65 KRIW 272017 AFDRIW Area Forecast Discussion National Weather Service Riverton WY 217 PM MDT Sat Apr 27 2024 .KEY MESSAGES... - Scattered showers continue across the state this afternoon/evening with winds becoming breezy as well. - Showers continue across western WY Sunday with scattered showers and thunderstorms spreading east during the afternoon. - Early indications of unsettled weather continuing throughout the upcoming week with multiple quick moving systems. && .DISCUSSION... Issued at 120 PM MDT Sat Apr 27 2024 A soggy start to the weekend for most of the Cowboy State as rounds of precipitation moved through overnight and early this morning. Eastern slopes of the Wind River Range look to have been the bullseye. This morning's COCORAHS reports show over 1 inch of rain in Fort Washakie and over 0.75 inches in Lander for the past 24 hours. Showers will continue across the state today with parts of the Bighorn Basin, Natrona and Johnson Counties having less of a chance (10-30%) for seeing precipitation. Elsewhere showers look likely, with most seeing a 50-80% chance of precipitation during afternoon today. Temperatures are on the cooler side today, with highs around 50, the warmest temperatures will be in the Bighorn Basin where the sun may break through the clouds. Winds increase by the early afternoon with breezy conditions developing across parts of Sublette, Sweetwater, Fremont, Natrona, and Johnson Counties. Gusts of 25 to 35 mph will be possible at times today. Wind weaken by the evening becoming light and variable overnight. Showers will begin to dissipate by the evening, with scattered showers possible over parts of western WY through the overnight. The upper-level low that brought precipitation to the state over the past few days will slowly move northeast towards the Northern Plains. A weak shortwave will trail behind this low moving into NW WY this evening bringing rain and high elevation snow showers. This weak shortwave moves through the state on Sunday bringing the chance (30-60%) for scattered showers and (5-15%) isolated thunderstorms. Precipitation comes to an end across much of the state by Sunday evening with a brief lull in activity before another system moves in on Monday. Another weak shortwaves sweeps across the PACNW and moves into the Northern Rockies by Monday afternoon. Showers look to develop by the late morning across western WY before gradually spreading east through the day. A few isolated thunderstorms will be possible across the state during the afternoon, with having a (10- 20%) chance for a thunderstorm. Winds look to increase Monday as the pressure gradient tightens due to the approaching shortwave. Currently models are showing a (40-70%) chance for most of the state to see gusts of 35+ mph during the day Monday. Winds look to remain breezy after Monday, as the pressure gradient remains tight due to another system nearing for the second half of the week. Temperatures will briefly rebound for Monday, with near normal values for areas east of the Divide. Cooler temperatures are forecast to return for Tuesday as a cold front sweeps across the region during the early morning hours. The remainder of the week is looking active with multiple quick hitting systems moving through the region. Impacts are still too uncertain at this time to go in detail about as we are still multiple days out. Overall, it looks like we have a 1 in 2 chance of having more unsettled weather through the upcoming week. The Cowboy State could possibly see a wide variety of weather ranging from thunderstorms to strong winds and even snow over the next week. && .AVIATION /00Z TAFS THROUGH 00Z MONDAY/... Issued at 149 PM MDT Sat Apr 27 2024 VFR conditions expected for all locations for the entirety of the period with the exception as always with JAC. Temporary MVFR ceilings and visibility between 01-05Z with light rain on station. Otherwise, these will improve to VFR after 12Z with light winds throughout. Mid level ceilings at all other locations with light winds overnight and morning hours Sunday. Winds will then increase by 16-18Z with daytime heating and strongest mixing with gusts up to 18-25kts at BPI, PNA, COD, CPR, and RKS. LND and RIW will see winds around 10-15kts before all diminish after the end of the period towards sunset for the next TAF cycle. 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...Hattings AVIATION...Lowe