Thunderstorms brought gusty outflow winds.
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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.
Thunderstorms brought gusty 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 Jun 27, 3:00 PM MST, 1 hour 10 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 400 PM MDT Tue Jun 27 2023 .SYNOPSIS...Cooler temperatures can be expected across northern Utah and southwest Wyoming behind a cold front through Thursday while warm, dry, and locally breezy conditions continue across the south. Weak disturbances embedded in the southwesterly flow aloft will bring the threat of high based thunderstorms to portions of northern Utah through Thursday before warmer and dry conditions build into the area this weekend. && .SHORT TERM (Through 12Z/6AM Thursday)...As of early Tuesday afternoon, a closed low was located over central Idaho, embedded within a broad trough axis that extends south to the vicinity of Southern California. Meanwhile, a diffuse low-level boundary was stretched from southwest to northeast across central Utah. Along and north of the boundary, the combination of buoyancy/instability and low to mid level wind shear has been sufficient enough to allow for the continued development of isolated shower and thunderstorm activity. Convective initiation has largely been tied to terrain, and convection has generally weakened shortly after emerging off of terrain initiation points. A slight increase in forecast shear and low-level baroclinicty late this afternoon and early evening (per high-res ensemble) might suggest a cell or two will be capable of slightly longer longevity, with the best chance for this likely over NW Box Elder County and/or Dugway, where modest forcing is forecast to be strongest. Main threats will be gusty outflow winds and small hail. Ensemble mean then favors isolated showers across portions of northern Utah through the night. Overall large-scale pattern appears similar on Wednesday, as the above-mentioned upper trough nudges closer, with the trough axis forecast to reside over western Nevada by Wednesday afternoon. One slight difference when compared to today is that model consensus suggests a modest mid/upper level jet streak will round the base of the trough across SE Utah Wendesday afternoon, and this jet streak appears to strengthen the low to mid level frontogenesis and associated large-scale support for precipitation. As a result, CAMs do once again favor shower and thunderstorm development along/north of the diffuse boundary Wednesday afternoon and early evening, but coverage is forecast to be greater thanks to the slight increase in large- scale support, instability/buoyancy and frontogenesis. Thus, coverage will trend more towards isolated to scattered. Small hail and gusty outflow winds once again appear to be the main threats. HREF wind probabilities and ensemble max winds are both stronger than today, suggesting a higher threat for gusty outflow winds over a larger area and a higher theoretical max wind gust speed (around 50 mph) from the strongest cells. Probabilities for gusts greater than 35 mph exceed 70% across Dugway and 50% across the Salt Lake Desert during the afternoon hours. .LONG TERM (After 12Z Thursday)...The extended forecast remains largely unchanged with a brief period of high terrain afternoon showers/thunderstorms over northern UT and SW Wyoming on Thursday evening and possibly creeping into Friday. With still a fairly dry subcloud environment, most showers and thunderstorms will have a threat of gusty, erratic outflow winds with minimal precipitation. Thursday will be the coolest day in the extended portion of the forecast, as ensembles are in good agreement that a strong ridge will build into the northwest. The trough that will be gradually tracking through the region is expected to have is axis through the state by the end of the day Friday with a ridge building in behind it. There is little uncertainty on the northward/southward extent of the ridge and how that could effect the warming trend. The overwhelming favorite has a growing trough in Canada that would bring the ridge more northward and thus warmer temperatures with it. This will promote clearer days and much warmer days across the region with forecasted highs reaching the low 90s for many northern and central valleys while southern, particularly southwestern UT areas creeping well into the triple digits. Warm, dry and calm weather will take us through the end of the extended period and into the month of July! && .AVIATION....AVIATION...KSLC...WNW winds will continue through the afternoon, with gusts to around 20kts lasting through ~03z. Light, northwest winds are likely to continue overnight, though there is a 20% likelihood of a transition to light, south winds late in the night (after ~10z). A 15% chance of thunder exists at the terminal this afternoon. Nearby isolated showers and thunderstorms may produce brief periods of gusty and erratic winds. .REST OF UTAH AND SOUTHWEST WYOMING...Isolated to scattered showers and thunderstorms are expected across northern Utah and southwest Wyoming through roughly 03-04z. These showers may produce periods of gusty and erratic winds, especially over the West Desert. Increased southwesterly flow with gusts to 30mph is expected across southeastern Utah. VFR conditions will prevail. && .FIRE WEATHER...Southwest flow will remain in place over the area through Thursday, when a trough of low pressure will shift overhead the area. A weak cold front has entered northern Utah and will remain nearly stationary across west- central through northeast Utah through Thursday. Weak disturbances embedded within the southwesterly flow will continue to move across the area during this time, reinforcing the cold front and maintaining daily shower and thunderstorm activity along and north of the front, especially over high terrain areas. Thunderstorms will mostly be a mix of dry and wet (with wet storms favored under stronger cores) while trending increasingly wet through Thursday. Meanwhile, south of the front, locally breezy conditions can be expected once again on Thursday, mainly southeast Utah where minimum relative humidities will remain around 10% or lower. Winds will be lighter than the past couple of days, however. Heading towards the weekend and into early next week, high pressure will strengthen over the Great Basin, promoting a drier, warmer, and more stable airmass with generally light and terrain driven winds. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && ADeSmet/Selbig/Cunningham For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity
Special Weather Statement
National Weather Service Salt Lake City UT
232 PM MDT Tue Jun 27 2023
UTZ103-107-110-272100-
Eastern Box Elder County UT-Wasatch Mountains I-80 North UT-
Cache Valley/Utah Portion UT-
232 PM MDT Tue Jun 27 2023
...A strong thunderstorm will impact portions of northwestern Cache
and northeastern Box Elder Counties through 300 PM MDT...
At 232 PM MDT, Doppler radar was tracking a strong thunderstorm over
Riverside, or 8 miles north of Tremonton, 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. Accumulating hail is expected on Interstate 15
between Fielding and Plymouth.
Locations impacted include...
Tremonton, Cache, Lewiston, Clarkston, Trenton, Plymouth, Riverside,
Peter, Richmond, Garland, Newton, Amalga, Fielding, Cornish and
Collinston.
This includes Interstate 15 between mile markers 381 and 395.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4200 11157 4172 11219 4187 11228 4201 11203
TIME...MOT...LOC 2032Z 245DEG 16KT 4183 11214
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
CRKSpecial Weather Statement
National Weather Service Salt Lake City UT
351 PM MDT Tue Jun 27 2023
UTZ101-272230-
Great Salt Lake Desert and Mountains UT-
351 PM MDT Tue Jun 27 2023
...Strong thunderstorms will impact portions of western Box Elder
County through 430 PM MDT...
At 351 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from Park Valley to 24 miles east of Montello.
Movement was east at 30 mph.
HAZARD...Wind gusts of 50 to 55 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.
Locations impacted include...
Park Valley, Utah Test and Training Range North, Great Salt Lake
North of the Causeway, Locomotive Springs, Standrod, Lynn, Curlew
Junction, Rosette and Yost.
This includes Utah Route 30 between mile markers 12 and 87.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4180 11264 4102 11312 4115 11383 4199 11387
4200 11284
TIME...MOT...LOC 2151Z 259DEG 27KT 4183 11334 4123 11371
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH
CRKThe Salt Lake City radar (KMTX), 68 km away, was scanning. The volume nearest the first event began at 23:08 UTC.
2 thunderstorm wind. Local standard time, as filed.
A wind gust of 62 mph was reported at the Hansel Valley mesonet site.
A wind gust of 61 mph was reported at the Chaulk Hill mesonet site.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2023Every state in 2023This day in weather historyWarnings in Utah, June 2023
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: 1196861, 1196862.