Residual moisture across southeast Utah fueled scattered thunderstorms across the region. Additionally, moderate instability led to some stronger thunderstorms; one of which produced a funnel cloud in Grand County.
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The episode as NWS GJT wrote it up.
Residual moisture across southeast Utah fueled scattered thunderstorms across the region. Additionally, moderate instability led to some stronger thunderstorms; one of which produced a funnel cloud 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 25, 10:20 AM MST, 31 minutes earlier.
Area Forecast Discussion National Weather Service Grand Junction CO 1120 AM MDT Sun Sep 25 2022 .SHORT TERM...(Today through Monday) Issued at 358 AM MDT Sun Sep 25 2022 Mostly clear skies overnight have led to efficient radiational cooling and a rather brisk early morning. High pressure remains firmly entrenched across the Great Basin, extending north into the Intermountain West, bringing northerly flow across the western slope today. The ridge amplifies as a deep low pressure trough dives southward into the Great Lakes region and down into the southeast CONUS. There is a very subtle feature in play though that can be picked out looking at the 500 mb streamlines and 700 mb winds. A subtle shortwave looks to move down the divide and settle over the San Juans this afternoon, with a boundary setting up at 700 mb over the San Juans, with southerly flow across southwest Colorado and northerly flow down to the northern San Juans. There is enough return flow to allow moisture to increase across the Four Corners along with this convergence signature over the San Juans to spark some isolated to widely scattered storms this afternoon. Most of the hi res CAM guidance is picking up on this activity so confidence is better than yesterday. In the absence of dynamic forcing though, any storms that form will die with the setting sun, but some clouds may linger across the south through the evening hours. Gusty outflow winds seem to be the primary player with storm activity today. Outside of the San Juans, expect mostly sunny skies and warming temperatures with highs touching a couple degrees above normal, meaning low 80s for many central and southern valleys and mid to upper 70s for the northern valleys. Higher elevation areas should remain in the 50s and 60s. On Monday, a shortwave will move ashore the Pacific Northwest as the deep Great Lakes trough pulls east to New England, allowing the ridge of high pressure over the Great Basin to take a slight bump eastward. This should draw a bit more moisture across the south with a better chance of scattered storms Monday afternoon over the San Juans. Temperatures remain the same with maybe a couple more degrees of warming across the northern areas with mostly dry conditions outside of the San Juans and dry conditions. .LONG TERM...(Monday night through Saturday) Issued at 358 AM MDT Sun Sep 25 2022 Tuesday will see another day of unseasonably warm temperatures with mostly dry conditions. However, as a deeper trough of low pressure pushes onto the Pacific Northwest coast, this will nudge the ridge east of the divide, drawing this moisture further north. A shortwave also moves across the north, providing some kind of forcing to get scattered storms to fire over the San Juans and even up to the central divide Tuesday afternoon. Big changes are in store though for the mid to late week timeframe as subtropical moisture levels increase significantly, upwards of 150 to almost 250 percent of normal in the Wednesday to Thursday timeframe. Helping this moisture along is a deep low pressure trough barreling inland across the Pacific Northwest and Intermountain West. This moves the ridge east of the divide and essentially breaks this ridge down, with troughiness across the Great Basin and western slope. This will result in increasing chances and coverage of showers and thunderstorms area wide. Also in the deck of cards is what is forecast to become a major hurricane moving into the Gulf of Mexico and some of this Gulf moisture looks to be drawn westward around the high and into the Desert Southwest and Four Corners region in this Wednesday to Thursday timeframe. So, this explains one part of the possible source of this moisture. This moisture does have a long ways to travel so while some areas may receive moderate to heavy rainfall at times, precipitation amounts may not be nearly as much as we saw with the remnants of recent tropical systems in the Pacific since that is more of a direct fetch than this Gulf moisture that has to travel over longer distances and encounter mountains before making its way here. Beyond Thursday, discrepancies crop up between models as to how long this moisture will stick around. The Pacific Northwest trough remains a big wildcard in how this evolves when this trough tracks across the northern Rockies. The GFS wants to push this moisture out by Friday with dry conditions returning for next weekend as high pressure ridge rebuilds over the west. The ECMWF on the other hand keeps his moisture hanging around through the coming weekend with troughiness sticking around as well. The blended forecast seems like a good middle ground at this time which keeps showers and storms in the forecast through next weekend, with better chances and coverage in the mountains of western Colorado, while the lower valleys begin to dry out with slight chance PoPs. Temperatures look to fall to below normal levels Thursday and beyond due to increasing clouds and showers. && .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) Issued at 1120 AM MDT Sun Sep 25 2022 Dry northwest flow will continue to bring clear/mostly clear skies to TAF sites throughout the next 24 hours with VFR conditions prevailing at all sites. A weak push of moisture into the San Juan Mountains from the southeast is expected to fuel isolated to widely scattered showers and embedded thunderstorms after 19Z, and on through 01Z. However, this activity is not expected to impact KTEX or KDRO. Winds will continue to be light and terrain driven. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...None. UT...None. && SHORT TERM...MDA LONG TERM...MDA AVIATION...NL
Hazardous Weather Outlook National Weather Service Grand Junction CO 410 AM MDT Sun Sep 25 2022 COZ001>014-017>023-UTZ022>025-027>029-261015- 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- 410 AM MDT Sun Sep 25 2022 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Isolated to widely scattered showers and storms are possible over the San Juans this afternoon. Otherwise, most areas should see mostly sunny skies and dry conditions with near to slightly above normal temperatures today. .DAYS TWO THROUGH SEVEN...Monday through Saturday Dry and unseasonably warm temperatures will continue through early next week with scattered storms possible over the San Juans and central divide mountains. Moisture slowly returns from the south and spreads northward mid to late next week, resulting in increasing chances and coverage of showers and storms, along with a return to below normal temperatures. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
The Grand Junction radar (KGJX), 148 km away, was scanning. The volume nearest the first event began at 17:51 UTC.
1 funnel cloud. Local standard time, as filed.
A funnel cloud was spotted roughly in the vicinity of Church Rock by the public looking east from Utah Highway 191.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2022Every state in 2022This day in weather historyWarnings in Utah, September 2022
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: 1051503.