A shortwave trough moved through eastern Utah and western Colorado, generating some isolated storms that produced strong gusty outflow winds as low levels remained dry. One particular storm produced a severe wind gust in Grand County.
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The episode as NWS GJT wrote it up.
A shortwave trough moved through eastern Utah and western Colorado, generating some isolated storms that produced strong gusty outflow winds as low levels remained dry. One particular storm produced a severe wind gust in Grand County.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Junction, CO wrote its last area forecast discussion before the first event at Sep 29, 4:22 PM MST, 4 hours 8 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Grand Junction CO 522 PM MDT Sun Sep 29 2024 .KEY MESSAGES... - Isolated showers across northwest Colorado this evening will produce some gusty winds and very little rainfall. - Near record high temperatures continue this week with very little spread in ensemble model outputs. - Model agreement remains consistent with the region dominated by high pressure through next weekend. && .SHORT TERM /THROUGH MONDAY/... Issued at 235 PM MDT Sun Sep 29 2024 The southern reaches of a trailing frontal boundary associated with an open wave passing through Alberta this afternoon has managed to organize into some localized instability on the terrain of the West Slope this afternoon. Dry boundary layer conditions and weak steering flow are keeping these features anchored to terrain and mostly just gusty outflow, virga showers. We did see a lightning strike in the San Juans, so at least one shower has exceeded expectations for the day. Isolated showers will remain in the forecast this evening across the northern half of the CWA as the shortwave swings through. An umbrella will likely prove unnecessary, but some gusty winds and very scattered raindrops will make it seem more threatening. Afternoon temperatures remain well above normal around the region, with Grand Junction Regional breaking another record, last set in 2010. Overnight lows will remain warm as well. Monday will find us back under the drier influence of the northwest flow coming across the ridge in the eastern Pacific. It does look like a bit of moisture and cloud cover will reappear on the terrain Monday afternoon favoring our southern mountains. Afternoon thermal instability could form another shower or two along the southern Divide, but dry surface conditions will chew into rainfall quickly. Highs will remain near record values again Monday with the region cut off from the polar jet, as discussed below. && .LONG TERM /MONDAY NIGHT THROUGH SUNDAY/... Issued at 235 PM MDT Sun Sep 29 2024 What a boring long term period. The polar front jet will stay well to our north through Saturday. As the jet drives most disturbances across the region, any troughs or shortwaves will also stay to our north. An area of high pressure off the California coast will be flattened and eventually rebuild and strengthen towards the end of the week. This strengthening will occur over the Great Basin and be centered squarely over the Four Corners region by Friday. Deterministic GFS and EC are highlighting some very isolated spots of 0.01 to 0.02 inches of precip over the San Juans during the week but even if this occurs, it'll be a sprinkle and that's about it. So it's going to be another period of rinse and repeat. Dry, warm to hot, and mostly sunny through Sunday. High temps will run well above normal for early October though a slight cooldown is possible heading into next weekend. && .AVIATION /00Z TAFS THROUGH 00Z MONDAY/... Issued at 519 PM MDT Sun Sep 29 2024 Showers and thunderstorms are a bit more widespread today, though still focused over the higher terrain. KDRO and KTEX are the most likely to see impacts out of these showers in the form of gusty winds and some light showers. Activity will come to an end by sunset, with gradually clearing skies. Winds tonight will be light and terrain driven. A wave moving through tomorrow will spark another round of mountain showers as well as producing gusty westerly to northwesterly winds at most terminals in the afternoon. VFR conditions will prevail for the next 24 hours. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...None. UT...None. && SHORT TERM...LTB LONG TERM...TGR AVIATION...TGJT
Hazardous Weather Outlook National Weather Service Grand Junction CO 301 AM MDT Sun Sep 29 2024 COZ001>014-017>023-UTZ022>025-027>029-301200- Lower Yampa River Basin-Central Yampa River Basin- Roan and Tavaputs Plateaus-Elkhead and Park Mountains- Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor- Central Colorado River Basin-Grand and Battlement Mesas- Gore and Elk Mountains/Central Mountain Valleys- Central Gunnison and Uncompahgre River Basin- West Elk and Sawatch Mountains-Flat Tops- Upper Gunnison River Valley-Uncompahgre Plateau and Dallas Divide- Northwest San Juan Mountains-Southwest San Juan Mountains- Paradox Valley/Lower Dolores River- Four Corners/Upper Dolores River-Animas River Basin- San Juan River Basin-Southeast Utah-Eastern Uinta Mountains- Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat- La Sal and Abajo Mountains-Canyonlands/Natural Bridges- 301 AM MDT Sun Sep 29 2024 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Isolated storms are possible over the high terrain this afternoon, especially over the eastern Uintas. .DAYS TWO THROUGH SEVEN...Monday through Saturday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
The Grand Junction radar (KGJX), 137 km away, was scanning. The volume nearest the first event began at 03:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
A thunderstorm wind gust of 63 mph was measured at the Canyonlands Regional Airport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2024Every state in 2024This day in weather historyWarnings in Utah, September 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1209273.