Area Forecast Discussion
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
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165 FXUS65 KRIW 241933 AFDRIW Area Forecast Discussion National Weather Service Riverton WY 133 PM MDT Tue Sep 24 2024 .KEY MESSAGES... - At or near record high temperatures expected the next several days. - Elevated fire weather concerns Wednesday and Thursday with low humidity and locally gusty winds. && .DISCUSSION... Issued at 1259 PM MDT Tue Sep 24 2024 H5 ridging continues to dominate the weather across Wyoming through the upcoming weekend. This will keep skies nearly clear through Saturday, with non-autumn temperatures. H7 temperatures still expected to be around 15C Wednesday through Friday, which translates to a sfc temperature range of mid 80s to low 90s for lower elevations east of the Divide, low 80s for lower elevations west of the divide, and lower 70s for higher elevations. These higher temperatures will contribute to slightly elevated fire weather concerns the rest of the week, with humidity levels generally falling to around 15 percent each afternoon. Winds tomorrow will be marginally concerning, with sustained winds above 15 mph only for greater Johnson and Natrona Counties, and are not currently expected to last for a full 3 hour period. Thus have opted not for a RFW at this time. Thursday may be a better concern for fire weather, as winds will be somewhat higher as a weak system passes to the north. More frequent and widespread winds above 15 mph and frequent gusts above 25 mph, especially from RKS to CPR to BYG. Looking into this weekend, temps remain well above normal, but as tempered slightly by increasing cloud cover from the next approaching system. This system would not impact locally before Monday, and models still in disagreement on how far south it sweeps before moving east. && .AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 1034 AM MDT Tue Sep 24 2024 VFR conditions expected for the entirety of the period. Expect light winds and clear skies through much of the period. Increasing winds towards the end and into the next TAF cycle for Wednesday afternoon, beginning at RKS and CPR after 17Z with daytime heating and mixing to the surface coupled with a stronger gradient. Otherwise, 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 smoke, icing, and turbulence forecasts. && .RIW WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...Straub AVIATION...Lowe