Area Forecast Discussion
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
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739 FXUS65 KRIW 261904 AFDRIW Area Forecast Discussion National Weather Service Riverton WY 104 PM MDT Thu Sep 26 2024 .KEY MESSAGES... - Well above normal temperatures continue the next several days. - Elevated to critical fire weather concerns continue through early this evening. - Much cooler starting early next week, but precipitation chances remain near zero through next week. && .DISCUSSION... Issued at 1253 PM MDT Thu Sep 26 2024 Mostly clear skies continue today as the H5 ridge remains the dominant feature across Wyoming. A trough along the Canadian border is bringing a weak front across Montana, which will be pushing into far northern Wyoming late this afternoon, bringing a brief but brisk north wind. Ahead of this front, west winds have been gusting 25 to 30 mph at times. This along with much drier air is bringing critical fire concerns to central and southern WY. See the fire discussion below for more details. All winds will be decreasing early this evening as the trough moves quickly east, relaxing the pressure gradient. Friday and Saturday will again be warmer than normal, with lighter winds continuing. Highs again reach the 80s for most lower elevations, with humidity levels falling to around 15 percent each afternoon. Sunday the next trough starts to sweep in fro the north. Unlike the current one, this one will be much farther south, and will have a better "cold" air push. Winds Sunday will again gust 25 to 35 mph, and with dry air still in place, fire concerns will again be elevated. Behind the front, a much cooler airmass will sweep southward across Wyoming Sunday night. This will be evident with much cooler temps on Monday, with a 20 to 30 degree drop between Sunday and Monday. Unfortunately, this system has minimal moisture available with it, so precipitation is not expected as the system passes. && .AVIATION /18Z TAFS THROUGH 18Z FRIDAY/... Issued at 1046 AM MDT Thu Sep 26 2024 Prevailing VFR/SKC conditions continue through the TAF period. Wind will increase this afternoon as a trough slides east through MT. Most terminals will have wind gusts ranging from 15-25 knots this afternoon. A weak cold front will push south this evening, resulting in a wind shift to more northerly at KCPR through the overnight hours. Wind will decrease shortly after sunset at most terminals and remain light through Friday as high pressure redevelops in the area. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on icing and turbulence forecasts. && .FIRE WEATHER... Issued at 1253 PM MDT Thu Sep 26 2024 Red Flag WArning continues through this evening for much of central and southern Wyoming. Winds have come up above 15 mph sustained, with gusts of 20 to 30 mph along the I-25 and I-80 corridors. Winds across Johnson County are expected to switch this afternoon fro the north with a weak frontal boundary, with gusts from the north near 25 mph. All winds decrease early this evening, and will be much lighter Friday and Saturday. Sunday will be another dry and gusty day, with Warnings again expected during the day. && .RIW WATCHES/WARNINGS/ADVISORIES... Red Flag Warning until 7 PM MDT this evening for WYZ279>281- 289. && $$ DISCUSSION...Straub AVIATION...Rowe FIRE WEATHER...Straub