Thunderstorms in Tooele County brought strong outflow winds.
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The episode as NWS SLC wrote it up.
Thunderstorms in Tooele County brought strong outflow winds.
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 24, 2:30 AM MST, 9 hours 55 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 330 AM MDT Wed Aug 24 2022 .SYNOPSIS...With high pressure just east of Utah and southwest Wyoming today, southerly flow will draw monsoonal moisture northward today, with the deepest moisture anticipated over western Utah. The ridge will flatten tonight, bringing a westerly flow that will spread the moisture eastward across the area for Thursday. A generally moist and unsettled pattern is expected to continue into the weekend. && .SHORT TERM (Through 12Z/6AM Friday)...High pressure has settled over western Colorado this morning. This feature was over the Great Basin yesterday but was nudged eastward by a pair of troughs moving onshore over the west coast. The position of the ridge has put Utah and southwest Wyoming over a southerly flow aloft that is starting to draw monsoonal moisture northward. While satellite derived PWs are currently in the 0.5 to 0.6 inch range across much of the area, seeing values as high as 1.0 inch over southern Utah. Moisture will only increase during the day today, with the most notable increases anticipated over western Utah, where the GFS (as an example) shows PWs in the 1.0 to 1.2 inch range spreading as far northward as the west desert by late this afternoon. Over the eastern half of the forecast area, it seems the moisture will be a bit slower to arrive with PWs predominately in the 0.7 to 0.8 range this afternoon. This influx of moisture will predictably increase coverage of afternoon and evening showers and thunderstorms, particularly over the higher terrain and the western valleys of Utah. Western Utah convection in particular will see enhancement in the late afternoon/evening as a weakening Pacific trough approaches northwest Utah, bringing some more favorable shear and dynamics. This feature is expected to slide across northern Utah tonight, allowing convection to linger a bit longer than usual during the overnight hours. The passage of this trough will slide the ridge further east as a second Pacific Northwest oriented trough moves over the top of it, causing it to flatten. As a result, Utah and southwest Wyoming will transition to a more westerly flow aloft for Thursday. This will shift the deepest moisture into eastern and southern Utah, with some drying anticipated over northern Utah. Because of this, current thinking is that the area of most widespread afternoon/evening convection will shift to southern Utah as well as locations east of I-15. This distribution of moisture is ultimately more favorable for the production of heavy rain over the more typically flash flood prone areas of the state, including the slot canyons of southern Utah and active burn scars that extend into eastern Utah, so overall flash flood potential increases noticeably for Thursday compared to the past few days. .LONG TERM (After 12Z/6AM Friday)...A weak high pressure ridge is forecast over the region toward the end of the week which is expected to degrade by Saturday. But, the forecast for Friday will remain with a risk for heavy rain and thunderstorms across the higher terrain of eastern and southern Utah. Northern and western Utah areas will largely remain dry. Saturday's forecast is expected to primarily be under the influence of an incoming closed low from the north. Strong winds remain forecast for Saturday afternoon and evening across the Bear River Range and into Southwest Wyoming, particularly impacting travelers across I-80 and those recreating on Bear Lake. Wind gusts around 25 to 30 mph are forecast with some ensemble members as high as 38 mph (at Evanston). Precipitation chances for Saturday at this point are overall less across southern/eastern Utah compared to Friday however confidence in the forecast is lowered as the forecast does rely on the progression and strength of the aforementioned low. The forecast for Sunday remains a bit of a mystery given uncertainty in the strength of the closed low (or will it be an upper level trough by this point?) Deterministic GFS runs still shows quite a deep low while the the 00z run of the ECMWF also shows a closed low but not quite as deep in comparison. 12z cluster means show a variety of solutions once again. The multi-model solution favors a weak trough. Variances in the ensemble forecasts are just as uncertain when you start to dive into specific details of the forecast. For example, the 18z run of the GFS ensembles showed Sunday as a windier day across SW WY but now the 00z has now backed off for Sunday and instead favors a windier day Saturday. Essentially what all this boils down to is that the forecast for Sunday is still uncertain, and if you have outdoor plans, to keep checking the forecast more frequently as it is likely to change and perhaps drastically as the day becomes more in the short term. Monday and Tuesday may still be impacted by the aforementioned closed low if indeed this low develops and lingers in the region. Otherwise, a dry and mild start to the week is expected. Following this potential weather maker the remainder of the work week is expected to be dry. && .AVIATION...KSLC...VFR conditions are forecast throughout the TAF period. Light southeast winds are anticipated through late morning before a northwest wind takes over through much of the day. High layer clouds are expected once again. Look for winds to shift back out of the southeast around 04Z this evening. REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions are forecast this morning with high based clouds and light winds noted across northern UT and SW WY. Canyon winds are noted at LGU and are expected to ease by mid-morning. Thunderstorms are most likely to impact northern Utah and SW WY locations during the mid afternoon to early evening hours and track from west to east. As such, western terminals will be impacted earlier in the afternoon, Wasatch Front terminals late afternoon and SW WY later in the evening. Wind gusts of 25 to 30 knots are likely associated with thunderstorms while gusts upward of 50 knots are possible. MVFR VIS are possible due to periods of heavy rain as well. Additional periods of rain showers and lowered CIG and/or VIS are possible aside from the main line of thunderstorms. Across southern Utah terminals, scattered thunderstorms are expected to develop in the higher terrain early this afternoon. Terminals may be impacted with gusty winds and lowered VIS through early this evening. Otherwise VFR conditions and light winds are forecast. && .FIRE WEATHER...High pressure has shifted just east of the area this morning, allowing for the flow aloft to shift to a more southerly direction. This flow is already starting to advect some monsoonal moisture northward and will continue to do so through at least Thursday. The main impact on sensible weather will be increasing coverage of afternoon and evening showers and thunderstorms, particularly over the higher terrain. Any storms that develop will produce heavy rain capable of flash flooding as well as frequent lightning and some gusty and erratic winds. As the flow aloft takes a more westerly direction late in the week, some drying is anticipated for northern Utah as deeper moisture remains over southern Utah. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && SHORT TERM/FIRE WEATHER...Traphagan LONG TERM/AVIATION...NDeSmet For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity For frequently asked questions about the Area Forecast Discussion visit... http://weather.gov/saltlakecity/general/afd_faqs.php
Special Weather Statement
National Weather Service Salt Lake City UT
115 PM MDT Wed Aug 24 2022
UTZ122-125-242000-
Southwest Utah UT-Southern Mountains UT-
115 PM MDT Wed Aug 24 2022
...A strong thunderstorm will impact portions of north central
Washington and south central Iron Counties through 200 PM MDT...
At 115 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles northwest of New Harmony, or 21 miles west of Cedar City,
moving northeast at 10 mph.
HAZARD...Wind gusts up to 50 mph and nickel 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...
Newcastle.
This includes Utah Route 56 between mile markers 29 and 51.
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 3751 11328 3759 11361 3786 11360 3786 11316
TIME...MOT...LOC 1915Z 210DEG 8KT 3761 11347
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
ADThe Salt Lake City radar (KMTX), 122 km away, was scanning. The volume nearest the first event began at 19:25 UTC.
3 thunderstorm wind. Local standard time, as filed.
A wind gust of 73 mph was recorded by Salt Flats mesonet station.
A wind gust of 64 mph was recorded by the Wendover Port of Entry automated weather station.
A wind gust of 64 mph was recorded within the U.S. Army Dugway Proving Ground mesonet.
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: 1054526, 1054528, 1054517.