High pressure remained centered over the Southern Plains which allowed for monsoon moisture to continue to stream into eastern Utah. This abundance of moisture resulted in scattered showers and thunderstorms across the region.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GJT wrote it up.
High pressure remained centered over the Southern Plains which allowed for monsoon moisture to continue to stream into eastern Utah. This abundance of moisture resulted in scattered showers and thunderstorms across the region. Storms were slow moving and produced heavy rain. Portions of San Juan County experienced flash flooding which led to significant road damage.
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 Aug 14, 10:38 AM MST, 2 hours 32 minutes earlier.
Area Forecast Discussion National Weather Service Grand Junction CO 1138 AM MDT Sun Aug 14 2022 .SHORT TERM...(Today through Monday) Issued at 446 AM MDT Sun Aug 14 2022 Satellite imagery this morning shows a few areas of scattered clouds moving south to north across the forecast area. Radar returns indicate that precipitation has all but dissipated across the area, with just a couple light showers lingering through the overnight hours mainly over northeast Utah. Much as has been the case in the recent past, expect daily convection to once again impact the area today once surface heating strengthens late this morning / early afternoon. Agreeing with satellite water vapor this morning, model solutions continue a plume of monsoonal moisture oriented from western Arizona northeast through roughly central Wyoming thanks to the persistent high to our east. This provides the Uintah Mountains upwards of 150% of normal precipitable water today, while west central and southwestern Colorado sit near normal. CAMs show that convection will start in earnest today between 17-18Z, favoring the usual high terrain. This activity will slowly move south to north. Showers (some of them strong) will likely persist through much of the night across the northern 1/3 of the forecast area with some CAPE remaining in play. Tonight, the best axis of moisture slides slightly to the southeast, moving the highest moisture content right through the center of our CWA. This moisture persists through the day on Monday with values nearing 200% of normal possible. Daytime temperatures remain near to just below normal in most places. Thanks to the moisture content on the ground and in the sky (clouds), overnight temperatures will struggle to fall down to normal. .LONG TERM...(Monday night through Saturday) Issued at 446 AM MDT Sun Aug 14 2022 While the high pressure will maintain much of the same activity from Monday into Tuesday, things get a little messy by mid-week as models disagree a bit on what happens to the high. This time of year, subtle differences in the position of our monsoonal high can make winners and losers pretty quickly. Latest consensus is that a high will build over northern Utah and affect much of the Intermountain West. This leaves at least the northern CWA under light northerly flow. Normally, that environment wouldn't be conducive to precipitation making -- at least for the couple/few days it takes for moisture to make the long way around the high. However, given our long duration monsoon thus far this year, it's likely that residual moisture will combine with some limited moisture advection from the southwest to continue storms across the southern 1/3 to 1/2 of the forecast area through at least this week. At any rate, the northern 1/3 of the forecast area looks to (at least initially) be impacted by slightly drier air moving in from the north, which will likely place a damper on convective potential later this week. Again, maximum temperatures remain slightly below normal and lows persist 0 to 10 degrees above normal through the long term. && .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) Issued at 1127 AM MDT Sun Aug 14 2022 Expect showers and thunderstorms developing through the afternoon over the higher terrain, becoming more widespread late this afternoon running into the evening with most activity ending by 06Z. A few showers me persist overnight north of the I-70 corridor. Gusty outflow winds to 40 kts are possible with storms as well as heavy rain. This heavy rain may cause visibility to dip to MVFR levels, though very briefly. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...None. UT...None. && SHORT TERM...SS LONG TERM...SS AVIATION...TGJT
Hazardous Weather Outlook National Weather Service Grand Junction CO 454 AM MDT Sun Aug 14 2022 COZ001>014-017>023-UTZ022>025-027>029-151100- 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- 454 AM MDT Sun Aug 14 2022 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Thunderstorms will form over the higher terrain from late morning through early afternoon and drift over low valley floors by this evening. Heavy rainfall, gusty outflow winds, small hail and frequent lightning will be possible with these storms. Nocturnal showers are most probable across west-central and northwestern Colorado, drifting to the north and northeast tonight. .DAYS TWO THROUGH SEVEN...Monday through Saturday Expect chances for storms each afternoon through the week. There is a potential for localized flooding, especially over steep terrain, burn scars, and saturated soils. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected today or tonight, however spotters are encouraged to relay rainfall amounts or any observed flooding to the National Weather Service in Grand Junction.
Special Weather Statement
National Weather Service Grand Junction CO
1226 PM MDT Sun Aug 14 2022
UTZ028-141900-
La Sal and Abajo Mountains UT-
1226 PM MDT Sun Aug 14 2022
...A strong thunderstorm will impact portions of northeastern San
Juan County through 100 PM MDT...
At 1225 PM MDT, Doppler radar was tracking a strong thunderstorm 13
miles north of Monticello. This storm was nearly stationary.
HAZARD...Winds in excess of 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This storm will remain over mainly rural areas of northeastern San
Juan County.
This includes U.S. Highway 191 in Utah between mile markers 78 and
95.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3795 10935 3804 10953 3823 10943 3810 10919
TIME...MOT...LOC 1825Z 213DEG 3KT 3806 10939
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
DBSpecial Weather Statement
National Weather Service Grand Junction CO
131 PM MDT Sun Aug 14 2022
UTZ027>029-142000-
La Sal and Abajo Mountains UT-Arches/Grand Flat UT-
Canyonlands/Natural Bridges UT-
131 PM MDT Sun Aug 14 2022
...An area of strong thunderstorms will impact portions of north
central San Juan and southeastern Grand Counties through 200 PM
MDT...
At 130 PM MDT, Doppler radar was tracking an area of strong
thunderstorms near Castle Valley, moving north at 20 mph.
HAZARD...Winds in excess of 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This strong thunderstorm will be near...
Moab around 140 PM MDT.
Castle Valley around 145 PM MDT.
This includes the following highways...
U.S. Highway 191 in Utah between mile markers 112 and 143.
Utah 128 between mile markers 0 and 38.
Utah 279 between mile markers 0 and 15.
Utah 313 between mile markers 2 and 7, near mile marker 10, and
between mile markers 13 and 22.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3859 10909 3831 10963 3871 10988 3899 10909
TIME...MOT...LOC 1930Z 158DEG 18KT 3858 10946
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
TGRSpecial Weather Statement
National Weather Service Grand Junction CO
207 PM MDT Sun Aug 14 2022
UTZ027>029-142045-
La Sal and Abajo Mountains UT-Arches/Grand Flat UT-
Canyonlands/Natural Bridges UT-
207 PM MDT Sun Aug 14 2022
...A strong area of thunderstorms will impact portions of
southeastern Grand County through 245 PM MDT...
At 207 PM MDT, Doppler radar was tracking an areas of strong
thunderstorms near Castle Valley, moving north at 20 mph.
HAZARD...Winds in excess of 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This storm will remain over mainly rural areas of southeastern Grand
County, including the following locations... Arches National Park.
This includes the following highways...
U.S. Highway 191 in Utah between mile markers 119 and 130.
Utah 128 between mile markers 0 and 35.
Utah 279 between mile markers 12 and 15.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3865 10909 3847 10955 3876 10968 3894 10908
TIME...MOT...LOC 2007Z 185DEG 19KT 3869 10947
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
TGRThe Grand Junction radar (KGJX), 151 km away, was scanning. The volume nearest the first event began at 20:11 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain from thunderstorms washed out a large portion of State Road 211 near the intersection of Utah Highway 191. Significant water flowed across the highway. Vehicles were stranded in the area as a result.
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, August 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: 1039722.