A cluster of thunderstorms and associated outflow winds moved across the Great Salt Lake on the evening of July 1. Some of these winds were strong to severe.
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The episode as NWS SLC wrote it up.
A cluster of thunderstorms and associated outflow winds moved across the Great Salt Lake on the evening of July 1. Some of these winds were strong to severe.
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 Jul 1, 9:07 PM MST, 13 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 1007 PM MDT Sat Jul 1 2023 .UPDATE...Persistent line of thunderstorms that began over far northwest Utah is currently over the Great Salt Lake and approaching portions of the Wasatch Front this evening. Though it seems to be weakening, have added scattered POPs for this area until midnight. Going forecast otherwise looks good and no additional updates are planned. Previous discussion follows, aviation section updated. && .SYNOPSIS...High pressure will strengthen across the region bringing a warming and drying trend heading into the Fourth of July. && .SHORT TERM (Through 12Z Monday)...A more typical summer pattern is finally setting up across the region. Afternoon upper air and satellite analysis indicate a ~594 dam upper level ridge centered south of Lake Tahoe. The northern jet remains fairly active with a series of shortwave troughs largely remaining well to the north of the Great Basin. A shortwave trough is currently crossing eastern Idaho into Montana and Wyoming. An area of convergence is noted with the shortwave trough across southern Idaho. Radar trends over the last few hours show relatively weak convection has developed along this convergence, with a few thunderstorms approaching far northern Utah. Current mesoanalysis indicates SBCAPE values near 1000 J/kg along the immediate Utah/Idaho border region with deep layer shear near 30 kts. This may allow at least a transitory threat of deeper convection with gusty winds and small hail along the immediate border region. CAMS indicate showers and perhaps an embedded thunderstorm may cross northeastern Utah this evening into tonight. Sunday will be even warmer than today, with temperatures approaching mid to perhaps upper 90s along the Wasatch front and nearing 107 to 109 across lower Washington County. As it hasn't been this warm yet this year, remember to be heat safe! .LONG TERM (After 12Z Monday)...A hot start to the long term forecast period expected as a stout mid level ridge remains more or less anchored through the SW CONUS. On Monday, mid to upper 90s are forecast throughout the Wasatch Front, with NBM probabilities suggesting around a 25% chance to see the first 100 degree day at KSLC. Many locations in far southern Utah will see temperatures exceeding 100 degrees, with the greater St. George area pushing near the 110 mark. For the northern portion of the forecast region, one caveat is the influence of a weak grazing trough. Energy associated with this feature along with a bit of moisture will yield the chance for some very widely isolated precipitation. That said, PoPs are still unlikely enough to preclude mention in all but a handful of spots, such as the UT/ID border region, portions of the Wasatch Back into the Bear River Valley, southwest Wyoming, and high elevations of the Uintas. On Tuesday (The Fourth of July), the aforementioned trough will continue to slide eastward, grazing the northern portions of the forecast region, and resulting in a weak surface boundary pushing in. At the very least, these features will help knock afternoon temperatures down several degrees in northern Utah and southwest Wyoming, with highs along the Wasatch front generally in the upper 80s to low 90s. Precipitation looks even less likely, with mentionable PoPs only noted from southwest Wyoming into the high terrain of the Uintas. Further south the effects will be more muted, but will still yield a cooldown of a few degrees. Additionally, tightened surface pressure gradient in combination with a belt of enhanced 700mb winds will help bring about some gustier conditions to southern and eastern Utah Tuesday afternoon and evening, with gusts around 30 to 40 mph expected. From midweek onward, influence of the ridge is generally expected to dominate, with dry conditions persisting and temperatures largely running above climatological normal. Otherwise, only feature of note is another trough digging into the PacNW Friday into the weekend, which looks to result in a bit more enhanced southwesterly flow atop the region, and the potential for some lower end gusty conditions in southern Utah. && .AVIATION...KSLC...A line of showers and thunderstorms is weakening as it approaches the Wasatch Front. Still, the line is expected to bring a temporary wind shift to the northwest at some point between 05Z and 07Z, with a return to southerly winds thereafter. There is a 30 percent chance of wind gusts in excess of 30 mph associated with these storms. VFR conditions will prevail with no additional shower activity anticipated overnight into tomorrow. .REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions with mostly clear skies and diurnally driven winds will persist as high pressure builds into the region. The only exception is for areas near the Great Salt Lake and the Wasatch Front where a weakening area of thunderstorms could bring areas of gusty winds through the remainder of the evening. && .FIRE WEATHER...A more typical for early July weather pattern will evolve over the next few days, with high pressure building across the Great Basin. This will bring a hot, dry trend into early next week to the region. As southwesterly flow builds into the state early next week ahead of a weak cold front, gusty winds can be expected Monday and Tuesday across central and southern Utah. Very dry minimum humidities are expected each day, especially across central and southern Utah, with poor overnight recoveries. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && Traphagan/Kruse/Warthen/Mahan For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity
The Salt Lake City radar (KMTX), 25 km away, was scanning. The volume nearest the first event began at 04:17 UTC.
2 thunderstorm wind. Local standard time, as filed.
The Hat Island mesonet station recorded a peak wind gust of 59 mph at 9:20 pm MST as a result of outflow winds associated with a nearby cluster of showers and thunderstorms moving through the area. A second strong wind gust of 58 mph was recorded at 9:30 pm before winds began to subside.
A tree was downed in West Point. Time estimated by radar.
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, July 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: 1100622, 1100623.