From the afternoon of July 6 on into the evening, isolated to scattered clusters of showers and thunderstorms impacted portions of northern Utah and southwest Wyoming, yielding a few strong to severe wind gusts.
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The episode as NWS SLC wrote it up.
From the afternoon of July 6 on into the evening, isolated to scattered clusters of showers and thunderstorms impacted portions of northern Utah and southwest Wyoming, yielding a few strong to severe wind gusts.
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 6, 3:07 AM MST, 11 hours 33 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 407 AM MDT Thu Jul 6 2023 .SYNOPSIS...Isolated showers and thunderstorms will continue at times across northern Utah and southwest Wyoming through Friday. Dry and breezy conditions return to southern Utah Thursday into the weekend while warmer temperatures return to the area as well. && .SHORT TERM (Through 12Z/6AM Saturday)...As of early Thursday morning, band of high-based showers and isolated thunderstorms extended from west to east from around Wendover eastward across the Tooele and Salt Lake Valleys and finally across the Uintas. This appears to be associated with a mid-level instability gradient along a remnant frontal zone that has become reactivated tonight. 06.00Z SLC sounding and forecast soundings do indeed reveal the presence of modest mid-level instability, with MUCAPE values of around 200J/Kg. CAMs have a good handle on these features, and suggest the shower/thunderstorm activity will continue through mid to late morning over many of the same areas, with only a slight northward advance before becoming more diffuse this afternoon. Nocturnal inversions will prevent gusts with this activity from reaching the surface through mid-morning, but can't rule out an isolated gust in the 30-40 mph range, and this is in line with the ensemble max and what was observed earlier tonight across the southern Tooele Valley. By late afternoon, CAMs suggest convective initiation will occur across NE Nevada, the Raft River Range and the Uintas, with this activity ultimately becoming banded and oriented in a similar fashion to what we're experiencing early this morning, suggesting a continued chance of nocturnal showers and isolated thunderstorms across northern Utah and SW Wyoming into Friday morning before diminishing. Regarding this afternoon's activity, while bulk shear values ~30kts would be enough to support an organized updraft or two, instability/buoyancy is forecast to be lacking, thus think it will be difficult for sustained, organized convection, and main threats will be limited to an isolated instance of gusty outflow winds. Friday afternoon, shear parameters are forecast to be similar to today's, but instability is forecast to be marginally more supportive (100-500J/Kg, highest over SW Wyoming). Thus convection that once again develops over NE Nevada, the Raft River Range and Uintas may exhibit a bit more longevity, and CAMs seem to represent this idea. A cool pool formed from merged outflow boundaries is seen originating over NW Utah before propagating SE across the Great Salt Lake Desert and Great Salt Lake, with gusts in the 25-35 mph range. Model consensus supports a gradual reduction in the coverage and intensity of this activity Friday night, but can't rule out an isolated shower lingering across portions of NW Utah through the night. .LONG TERM After 12Z/6AM Saturday)...The extended forecast period is largely unchanged as consensus to grow on a ridge dominating the Great Basin region. A ridge over the south-central/southwestern United States is expected to extend northward, positioning itself over Utah. This will help promote warmer and dryer conditions across the CWA with many cities reaching well into the 90s and even the triple digits through the weekend. Relative humidities will easily be into the single digits for many areas, particularly down in southern UT where fire weather chances are gradually increasing. However even with the warming and drying trend the flow aloft with the ridge should be able to keep winds mostly light but some efficient mixing with the warmth could lead to afternoon gusts to be 20-25 knots. An eastern Pacific tropical system could bring a slight flip in conditions as it approaches land and gets wrapped into the overall flow aloft. Its development inland will likely depend on its progress over water but as of now looks to move inland with little to no risk associated with it with current NBM grids keeping very low PoPs. At this point the extended forecast looks to remain warm dry and calm as we move further into July for Utah and SW Wyoming. && .AVIATION...KSLC...VFR conditions will continue through current TAF period. Showers and even weak storms will roll through from 09-12Z that could mess with winds slightly buy otherwise expect light and diurnally driven conditions throughout the period under mostly clear skies. .REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions expected to persist at all terminals through the current TAF period. VFR conditions will continue through current TAF period. Showers and even weak storms will roll through the SLC area from 09-12Z that could mess with winds slightly buy otherwise expect light and diurnally driven conditions outside of southern sites potentially gusting to around 20 knots. && .FIRE WEATHER...Across southern Utah, hot, dry and breezy conditions will continue into early next week. Winds across southern Utah will be breezy each afternoon and early evening from today (Thursday) into at least early next week, with the strongest winds expected this afternoon and early evening as well as Monday afternoon and early evening, based on the latest forecast. South to southwest winds in the 20-30 mph range with locally higher gusts in the 30-40 mph range for wind prone areas are expected this afternoon/early evening as well as Monday afternoon/early evening. Take a just a few mph off these peak gusts Friday through Sunday. Afternoon minimum relative humidities will remain in the single digits, and overnight recoveries will be poor. Only a slight increase in minimum humidities is expected this weekend into early next week, when values will bottom out in the 10-15% range with a smattering of single digits. Therefore, meteorological conditions will reach critical values of wind and humidity across portions of southern Utah, especially this afternoon/early evening and Monday afternoon/evening. A gradual warming trend is expected today through early next week as high pressure slowly builds into the area. The only exception appears to by Monday as a shortwave briefly flattens the ridge across the area. Unsettled weather will continue across northern Utah through Friday associated with a weak frontal boundary, with isolated to widely scattered showers and thunderstorms. These thunderstorms will be a mix of dry and wet storms. This activity will be capable of producing gusty outflow winds. While no precipitation is currently forecast across the area beyond Friday, subtle disturbances could result in isolated thunderstorms, but at this point it's too early to identify on which days this threat is highest. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && ADeSmet/Selbig For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity
The Salt Lake City radar (KMTX), 151 km away, was scanning. The volume nearest the first event began at 21:40 UTC.
1 thunderstorm wind. Local standard time, as filed.
The I80 - Leroy mesonet station recorded a period of wind gusts to 65 mph as a result of outflow winds associated with a nearby cluster of showers and thunderstorms moving through the area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2023Every state in 2023This day in weather historyWarnings in Wyoming, 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: 1121142.