Area Forecast Discussion
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
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641 FXUS65 KRIW 270405 AFDRIW Area Forecast Discussion National Weather Service Riverton WY 1005 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 /06Z TAFS THROUGH 06Z SATURDAY/... Issued at 1030 PM MDT Thu Sep 26 2024 VFR conditions expected through the period with pristine flying to be had. Mainly clear skies and light winds generally southwest to west for all locations throughout under the influence of building high pressure. No other weather elements are expected with similar conditions Saturday before some stronger winds on Sunday. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on smoke, 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... None. && $$ DISCUSSION...Straub AVIATION...Lowe FIRE WEATHER...Straub