Scattered convection developed in advance of an approaching shortwave trough digging through the Pacific Northwest. This convection resulted in some isolated instances of severe wind gusts.
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.
Scattered convection developed in advance of an approaching shortwave trough digging through the Pacific Northwest. This convection resulted in some isolated instances of 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 Sep 10, 3:13 PM MST, 2 hours 32 minutes earlier.
Area Forecast Discussion
National Weather Service Salt Lake City UT
413 PM MDT Tue Sep 10 2024
.SYNOPSIS...Much drier conditions will build into Utah Wednesday
with strong southwest winds ahead of a storm system that will
track into the western U.S. Winds will diminish Wednesday night
through Thursday as a cold front track from northwest to
southeast. Light precipitation is likely in southwest Wyoming and
northern Utah, while much cooler conditions will build in
throughout.
&&
.SHORT TERM (Through 12Z/6AM Thursday)...The axis from a weak
ridge has tracked to the east, while a longwave trough positioned
off the coast of British Columbia digs southeast. The longwave
trough will track into the western U.S. early Wednesday.
Throughout southwest Wyoming and Utah, there will be much drier
southwest flow. Winds at 700 mb will be from roughly 25-40 knots
throughout southwest Wyoming and Utah. Gusts of a similar
magnitude will mix to valley floors with dry conditions and
efficient mixing. Relative humidity values of less than 10 percent
will be in place for many places where there will be gusty
southwest winds, which will bring high fire danger.
The strong southwest flow will advect wildfire smoke primarily
from California into Utah. The most dense smoke will be from a
corridor from southwest Utah through southwest Wyoming.
As the trough slides into Utah late Wednesday into Thursday, a
cold front will track in from the northwest, with winds
diminishing and transitioning to the northwest. Much cooler
conditions will build in once the front pushes through.
.LONG TERM (After 12Z/6AM Thursday), Issued 439 AM MDT...
An upper trough will encompass much of the Great Basin at the
beginning of the long term period, with the associated cold front
stretching across central Utah. Ahead of this front, warm dry and
breezy to windy conditions will persist into the day Thursday
across southern and eastern Utah, resulting in critical fire
weather conditions. Cooling behind this front will drop max
temperatures 5-8 degrees across southern Utah Thursday afternoon.
Further north, much cooler air behind the frontal boundary will drop
temperatures from the low 90s Wednesday (average for mid-August), to
early October-like max temperatures in the upper 60s-low 70s
Thursday along the Wasatch Front. With numerous ongoing wildfires
across OR/ID, its likely the frontal passage will result in a
considerable increase in smoke across the forecast area Thursday.
The upper low and best upper forcing within the upper trough will
remain north of the forecast area, with only a 30-40% chance for
measurable precipitation across northern Utah/southwest Wyoming
Thursday, mainly north of I-80.
As the upper trough lifts out of the region Friday, a predominantly
zonal flow will follow for the upcoming weekend. Low level cool air
will linger through Friday across the north, before a quick rebound
in temperatures follows for the weekend.
Model guidance is in general agreement with the next upper trough
approaching the Pacific Coast late in the weekend, however
considerable spread remains with respect to the evolution of this
trough and how quickly this feature moves inland. Roughly 50% of
guidance brings this trough into the Great Basin by Monday, while
the other half leaves the trough axis along or just upstream of the
Pacific Coast. As such have maintained a blend of model guidance in
the forecast for the end of the long term period.
&&
.AVIATION...KSLC...Light showers will continue to develop to the
south of KSLC this afternoon, becoming more widespread over the
terminal after 01-02z. Winds may become gusty and erratic at times,
though this chance is somewhat low after 01-02z (30% chance). More
uncertainty lies in the wind direction this afternoon, with only a
55% chance of winds turning northwesterly between 22-02z. Southerly
winds will then continue to strengthen overnight, becoming quite
gusty to 25-30kts ahead of a cold frontal passage Wednesday evening.
.REST OF UTAH AND SOUTHWEST WYOMING...Scattered showers and
thunderstorms will continue to develop this afternoon across mainly
southeastern UT and higher terrain of northern UT/southwestern WY.
These storms will be capable of producing gusty and erratic outflow
winds. Showers across the south will diminish by 03-05z, though
light showers are expected to linger through 09-12z north of KDTA-
KPUC. Otherwise, winds will gradually increase out of the south to
southwest overnight, and especially after 17z Wednesday. Winds will
be strongest across western valleys (including KCDC, KMLF) and near
KEVW, with gusts to 30-35kts possible. A cold front will push into
northwestern UT Wednesday evening, transitioning winds to
northwesterly.
&&
.FIRE WEATHER...Isolated to scattered showers and thunderstorms primarily
capable of gusty, erratic outflow winds will diminish late Tuesday.
A storm system will track into the western U.S. early Wednesday,
bringing enhanced southwest winds throughout Utah. Winds will be
strongest in western and southern Utah through the day, with sustained
speeds of 20-30 mph and gusts around 45 mph. Relative humidity as low
as 6-12 percent will bring for critical fire weather conditions. A cold
front will push into northwest Utah late Wednesday and reach southwest
Utah early Thursday. Winds will be much lighter for those locations
once the front pushes through.
Portions of southern and much of eastern Utah will keep enhanced
southwest winds through much of Thursday. Sustained wind speeds of
15-25 mph with gusts around 40 mph are likely. Relative humidity
will be as low as 8-14 percent. Winds will diminish through
Thursday evening once the front pushes through.
&&
.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Red Flag Warning from 11 AM Wednesday to midnight MDT Wednesday
night for UTZ478-492-495-497.
Red Flag Warning from noon Wednesday to 8 PM MDT Thursday for
UTZ489-494-498.
WY...None.
&&
SHORT TERM...Wilson
LONG TERM...Seaman
AVIATION...Cunningham
FIRE WEATHER...Wilson
For more information from NOAA's National Weather Service visit...
http://weather.gov/saltlakecityThe Salt Lake City radar (KMTX), 134 km away, was scanning. The volume nearest the first event began at 00:42 UTC.
4 thunderstorm wind. Local standard time, as filed.
The CAMEL BACK MTN mesonet station recorded a wind gust of 62 mph as a result of outflow winds associated with a nearby cluster of showers and thunderstorms moving through the area.
The WHITE SAGE mesonet station recorded an initial peak wind gust of 71 mph, followed by an additional gust of 63 mph, as a result of outflow winds associated with a nearby cluster of showers and thunderstorms moving through the area.
The DUGWAY-S mesonet station recorded a wind gust of 60 mph as a result of outflow winds associated with a nearby cluster of showers and thunderstorms moving through the area.
The CENEWS mesonet station recorded a wind gust of 62 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 Utah in 2024Every state in 2024This day in weather historyWarnings in Utah, September 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: 1207245, 1207244, 1207246, 1207247.