Area Forecast Discussion
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
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314 FXUS65 KRIW 242307 AFDRIW Area Forecast Discussion National Weather Service Riverton WY 507 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 /00Z TAFS THROUGH 00Z THURSDAY/... Issued at 458 PM MDT Tue Sep 24 2024 VFR conditions expected throughout the period under high pressure and a weak gradient. Light winds and clear skies overnight into Wednesday morning. Winds will increase after 17Z at KCPR and KRKS, then other locations after 18-19Z due to an increasing gradient with a subtle wave to the north. Gusts up to 18-25kts expected before diminishing after the end of the period Wednesday evening towards sunset. Otherwise, no other weather elements 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/LaVoie