Monsoonal showers and thunderstorms brought flash flooding and gusty winds to Utah.
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 SLC wrote it up.
Monsoonal showers and thunderstorms brought flash flooding and gusty winds to Utah.
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 Salt Lake City, UT wrote its last area forecast discussion before the first event at Aug 12, 2:23 AM MST, 10 hours 12 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 323 AM MDT Mon Aug 12 2024 .SYNOPSIS...Monsoonal moisture will remain over Utah and southwest Wyoming for the early part of the weekend, bringing thunderstorms capable of producing heavy rain and gusty winds. Drier air will move in for the latter part of the week, with moisture possibly returning by the weekend. && .SHORT TERM (Through 12Z Wednesday)...High pressure has shifted eastward into Colorado this morning, putting Utah and southwest Wyoming under a more southerly flow than has been seen the past few days. Satellite derived PW values are presently in the 0.8 to 1.0 inch range across the area, with some values up to 1.2 inch over southwest Utah. In this moist and unstable airmass, convection is continuing overnight, primarily focused over an area running north to south across the center of Utah, aided by some embedded shortwave energy. CAMs indicate this activity will tend to diminish by sunrise with that additional instability exiting the area. In the southwest flow, will see the deeper moisture over southern Utah lift northward into northern Utah. Afternoon and evening convection today will be aided by shortwave energy ejecting from a system moving onshore along the northern California coast. The shortwaves will move into northern Utah during the late afternoon and early evening. Thus, anticipating the best coverage of convection today for the northern half of the state. Gusty winds will be likely with any storms that develop, and this would also bring a flash flooding threat to northern Utah burn scars. Moisture and instability will remain over southern Utah as well, keeping an elevated flash flood threat over the area. However, given that coverage is expected to be a bit more scattered in nature today, have opted against the issuance of a Flash Flood Watch at this time. For Tuesday, the previously mentioned northern California trough is expected to move over the top of the Colorado ridge, grazing northern Utah as it does so and adding a westerly component to the flow aloft. This will start to bring drier air into western portions of the area by late in the day. Because of this, will see the convective threat Tuesday afternoon become more focused over the western half of Utah. .LONG TERM (After 12Z Wednesday)...On Wednesday an upper level jet max associated with an easterly shifting trough will slide atop the forecast region. In combination with the movement of the southern CONUS ridge, moisture advection into the area will become less favorable, and PWAT values will gradually fall back nearer to seasonal normal values through the day. That said, remaining moisture in combination with diurnal heating and synoptic support will be sufficient to trigger isolated to scattered daytime convection through northern and eastern Utah, as well as southwest Wyoming. To that end, the signal for highest coverage is noted along the high Uintas on into southwest Wyoming. With the stronger jet flow aloft, shear values will once again be a bit elevated (deep layer shear around 20-40 kts) which may help to generate some isolated instances of stronger and more organized convection. As daytime heating wanes and drying trend continues, lingering convection will begin to fade late evening into the overnight hours. Thursday and Friday look to be the quieter days of the forecast period as positioning of the northern trough and southern ridge remain less favorable for stronger moisture advection into the region. To that end PWAT values to fall closer to 60-90% of normal for mid August, and as such daily convective potential becomes much more isolated in coverage. The best signal at the moment for a bit more scattered activity is noted Thursday afternoon in the high Uintas, southwest Wyoming, and areas near the Idaho/Utah border where ensembles suggest PWATs may linger a bit closer to that 90% side of the range. Friday appears to become even more isolated, with any afternoon initiation more likely off of high terrain. Still, given the stronger westerlies aloft, shear values will be a bit elevated and any convection that manages to mature in the right place could still manage to trend a bit on the strong side. Moving into the weekend, ensemble guidance shows fairly good consensus that the southern ridge will migrate back towards the Four Corners to Southern Plains region while troughing amplifies through the PacNW. While some mostly minor differences are noted in the exact placement/strength of these features, the general setup will help increase deeper south to southwesterly flow, in turn promoting increased moisture transport back into the region. As a result, forecast carries a return of daily isolated to scattered convective chances, with coverage particularly favored across southern Utah as well as generally along and east of the high terrain. Those with weekend recreation plans that may take them to rain prone areas such as slot canyons, typically dry washes, and slickrock areas will at least want to keep an eye on the daily trends. While less likely, there does remain a small subset (around 10%) of ensemble members which favor a stronger ridge positioned nearer to the forecast region, which would yield drier and warmer weather than currently included with this forecast. && .AVIATION...KSLC...Pattern will promote increasingly active weather on Monday, with widespread scattered convective development expected through the afternoon. Convection will carry threat of lightning, gusty erratic outflow winds, and brief periods of heavy rainfall. Any stronger thunderstorms directly over the terminal will be capable of periodic VIS reductions below VFR. While the strongest convection is expected to trend downward late evening into the overnight hours, scattered thundershowers will remain an ongoing possibility. Excluding the aforementioned outflow threat, winds largely favored to carry a southerly directional component much of the period. .REST OF UTAH AND SOUTHWEST WYOMING...Active weather is once again expected for the TAF period across much of the area. A few lingering thundershowers may remain Monday morning, but anticipate convection to quickly increase in coverage and become fairly widespread through the afternoon hours. Convection will be capable of lightning, gusty erratic outflow winds, and periodic heavy rain. The strongest of these storms will carry potential to briefly reduce VIS below VFR. Convective coverage will begin to become a bit less widespread and trend slightly weaker late evening on into the overnight, but activity appears likely to persist in some capacity for a portion of the night. && .FIRE WEATHER...With monsoonal moisture in place, the state will see another round of showers and thunderstorms capable of producing wetting rains. Storms today will be more focused over northern Utah than the past few days, though the potential for storms continues over southern Utah. With the passage of a series of troughs Tuesday into Wednesday, the flow aloft will turn more westerly, allowing drier air to move in. This will bring the potential for critical fire weather conditions beginning Thursday, particularly for southwestern portions of the area. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && SHORT TERM/FIRE WEATHER...Traphagan LONG TERM/AVIATION...Warthen For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity
Special Weather Statement
National Weather Service Salt Lake City UT
1126 AM MDT Mon Aug 12 2024
UTZ115-121745-
Western Millard and Juab Counties UT-
1126 AM MDT Mon Aug 12 2024
...A strong thunderstorm will impact portions of western Millard
County through 1145 AM MDT
...
At 1126 AM MDT, Doppler radar was tracking a strong thunderstorm 12
miles south of Garrison, or 18 miles south of Baker, moving northeast
at 5 mph.
HAZARD...Wind gusts up to 50 mph and half inch 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 western Millard
County.
This includes Utah Route 21 between mile markers 8 and 15.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3889 11404 3878 11388 3869 11405
TIME...MOT...LOC 1726Z 222DEG 5KT 3875 11408
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
WebberSpecial Weather Statement
National Weather Service Salt Lake City UT
1242 PM MDT Mon Aug 12 2024
UTZ101-115-121915-
Western Millard and Juab Counties UT-
Great Salt Lake Desert and Mountains UT-
1242 PM MDT Mon Aug 12 2024
...A strong thunderstorm will impact portions of north central Juab
and southern Tooele Counties through 115 PM MDT
...
At 1242 PM MDT, Doppler radar was tracking a strong thunderstorm near
Fish Springs Wildlife Refuge, or 45 miles southwest of Dugway English
Village, moving northeast at 20 mph.
HAZARD...Wind gusts up to 50 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Fish Springs Wildlife Refuge.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3966 11326 3972 11350 3999 11337 3989 11298
TIME...MOT...LOC 1842Z 211DEG 17KT 3976 11335
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
WebberSpecial Weather Statement
National Weather Service Salt Lake City UT
106 PM MDT Mon Aug 12 2024
UTZ101-121945-
Great Salt Lake Desert and Mountains UT-
106 PM MDT Mon Aug 12 2024
...Strong thunderstorms will impact portions of southwestern Tooele
County through 145 PM MDT
...
At 106 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 11 miles northwest of Dugway Proving Ground
Test Range to 17 miles northwest of Fish Springs Wildlife Refuge.
Movement was northeast at 20 mph.
HAZARD...Wind gusts up to 50 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Dugway Proving Ground Test Range and Utah Test and Training Range
South.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4057 11295 4007 11317 4000 11353 3996 11377
4018 11364 4043 11345
TIME...MOT...LOC 1906Z 235DEG 16KT 4028 11342 4005 11359
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
WebberSpecial Weather Statement
National Weather Service Salt Lake City UT
117 PM MDT Mon Aug 12 2024
UTZ115>118-121945-
Sanpete Valley UT-Western Millard and Juab Counties UT-
Central Mountains UT-Eastern Juab/Millard Counties UT-
117 PM MDT Mon Aug 12 2024
...A strong thunderstorm will impact portions of western Sanpete,
northeastern Millard and southeastern Juab Counties through 145 PM
MDT
...
At 116 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles northwest of Scipio, moving northeast at 20 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail, as well as
frequent cloud-to-ground lightning.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Oak City, Yuba Lake State Park, and Mills.
This includes Interstate 15 between mile markers 191 and 206.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 3924 11227 3936 11235 3956 11203 3933 11185
TIME...MOT...LOC 1916Z 239DEG 17KT 3933 11221
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
WebberSpecial Weather Statement
National Weather Service Salt Lake City UT
126 PM MDT Mon Aug 12 2024
UTZ101-105-106-122000-
Salt Lake Valley UT-Utah Valley UT-
Great Salt Lake Desert and Mountains UT-
126 PM MDT Mon Aug 12 2024
...A strong thunderstorm will impact portions of southwestern Salt
Lake, northwestern Utah and eastern Tooele Counties through 200 PM
MDT
...
At 126 PM MDT, Doppler radar was tracking a strong thunderstorm near
Ophir, or 14 miles southeast of Tooele, moving northeast at 5 mph.
HAZARD...Wind gusts of 50 to 55 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Lehi, Herriman, Eagle Mountain, Bluffdale, Cedar Fort, Ophir, Camp
Williams, Bingham Canyon Mine, and Saratoga Springs.
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 4029 11219 4035 11226 4056 11211 4039 11189
TIME...MOT...LOC 1926Z 213DEG 6KT 4036 11219
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH
WebberSpecial Weather Statement
National Weather Service Salt Lake City UT
134 PM MDT Mon Aug 12 2024
UTZ101-122000-
Great Salt Lake Desert and Mountains UT-
134 PM MDT Mon Aug 12 2024
...A strong thunderstorm will impact portions of south central Tooele
County through 200 PM MDT
...
At 134 PM MDT, Doppler radar was tracking a strong thunderstorm 14
miles southwest of Dugway English Village, moving northeast at 10
mph.
HAZARD...Wind gusts up to 50 mph and penny 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.
Locations impacted include...
Dugway English Village.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 3999 11283 4005 11307 4027 11300 4019 11260
TIME...MOT...LOC 1934Z 202DEG 7KT 4006 11294
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH
WebberThe Salt Lake City radar (KMTX), 137 km away, was scanning. The volume nearest the first event began at 19:32 UTC.
20 thunderstorm wind, 8 hail, 7 flash flood, 2 flood. Local standard time, as filed.
A wind gust of 61 mph was recorded at the Tower Grid mesonet site.
A wind gust of 61 mph was recorded at the White Sage mesonet site.
A wind gust of 60 mph was recorded at the NW Decon Pad mesonet site.
A power pole was reported to be down from strong winds.
A wind gust of 63 mph was recorded at the Causeway mesonet site.
A CoCoRaHS observer reported 1 inch diameter hail.
Reports, videos, and webcams showed several flooded roads.
A wind gust of 62 mph was recorded at the Lower Cedar Mtn mesonet site.
Time is estimated. Homes in Saratoga Springs sustained water damage due to intense bursts of rain, in particular on South Island Road. City parks were also impacted with floodwaters. Construction sites were also affected by rainfall.
A wind gust of 61 mph was recorded at the White Sage mesonet site.
A wind gust of 59 mph was recorded at the Alta Aquaduct mesonet site.
Park rangers reported that multiple canyons near the Observation Point area had flash flooding. Time is estimated.
Park rangers reported deep fast flowing water in Buckskin Gulch. The exact details regarding depth of water are not known. Three hour radar estimated precipitation across most of the warned area ranged from 1-2 inches.
The Paria River near Kanab gauge recorded a peak flow of 1270 cfs when the flood wave passed through.
A park ranger reported water across Notom Road from Burrow Wash.
A wind gust of 58 mph was recorded at the Salt Flats mesonet site.
State Route 50 was closed from Scipio to Salina from milepost 131 to milepost 154 due to flooding.
A wind gust of 61 mph was recorded at the Playa Station mesonet site.
A wind gust of 64 mph was recorded at the Lower Cedar Mtn mesonet site.
The Escalante River near Escalante gauge recorded a flow increase to 2300 cfs.
A wind gust of 69 mph was recorded at the Cedar Mountain mesonet site.
A wind gust of 62 mph was recorded at the Clover mesonet site.
Social media reports showed 1 inch diameter hail in Sunset and Clearfield.
A wind gust of 59 mph was recorded at the SR-177 at MP 5 mesonet site.
A social media photo showed one inch diamter hail in Clearfield.
A social media post showed pictures of a large tree that was snapped by strong winds in Magna.
Social media photos from around Eagle Mountain, Saratoga Springs, and Lehi showed 1-1.5 inch diameter hail.
A wind gust of 59 mph was recorded at a personal weather station in Saratoga Springs.
One inch diameter hail was reported at Saratoga Springs.
Social media reports showed 1.5 inch diameter hail at Lehi. Time and location are estimated by radar.
A wind gust of 59 mph was recorded at the Wanship mesonet site.
The Tooele County emergency manager reported a debris flow from the Jacob City Fire burn scar on county roads near Soldier Creek. Utah Department of Transportation officials also reported mud and rock across state Route 36 following the Flash Flood Warning.
Social media photos showed hail from 1-1.75 inches in diameter at Orem and Lindon.
A wind gust of 59 mph was recorded at the I-15 @ Provo mesonet site.
A wind gust of 65 mph was recorded at the Provo Canyon mesonet site.
A wind gust of 62 mph was recorded at the I-15 at Orem mesonet site.
One inch diameter hail was reported at Lindon.
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, August 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: 1214097, 1214098, 1214099, 1214100, 1214101, 1213209, 1214426, 1214103, 1214422, 1214104, 1214105, 1212963, 1212965, 1213009, 1212986, 1214107, 1213222, 1214108, 1214109, 1213023, 1214111, 1214113, 1213183, 1214114, 1214399, 1214115, 1213192, 1214116, 1214406, 1214412, 1214117, 1213187, 1213194, 1214119, 1214120, 1214121, 1214417.