Utah, 2025

Debris Flow in Utah, April 1, 2025

April 1, 2025 · NWS SLC · 1 event in 1 county or zone

A mudslide reached the road in Spanish Fork Canyon.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
$1,000
Crop damage
None recorded
Events
1

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.

What happened

The episode as NWS SLC wrote it up.

A mudslide reached the road in Spanish Fork Canyon.

What forecasters said that day

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 Apr 1, 2:59 PM MST, 3 hours 1 minute earlier.

Area forecast discussion, Apr 1, 2:59 PM MST, 3 hours 1 minute before
Area Forecast Discussion
National Weather Service Salt Lake City UT
359 PM MDT Tue Apr 1 2025

.SYNOPSIS...Unsettled weather will continue across the region
through Friday. A warming and drying trend will begin over the
weekend into early next week.

&&

.SHORT TERM (THROUGH 00Z FRIDAY)...A mean longwave trough has become
established across the western CONUS this afternoon. Embedded within
this trough, several shortwave disturbances will continue to rotate
through the area. A shortwave trough currently moving through Utah,
combined with steep lapse rates owing to cold air aloft, has spawned
some snow showers this afternoon. These showers should wane this
evening as a weak shortwave ridge builds into the area. The heavier
showers could result in briefly impactful weather, although
additional accumulations will generally remain light. A few CAMs do
continue to produce some lake-effect precipitation southeast of the
GSL tonight, but the majority do not and local guidance only has up
to a 10% chance of occurrence.

The next impactful disturbance is currently noted over the NorCal
coast. This shortwave trough will rotate southeast along the Sierra
Nevada tonight and along the UT/AZ border tomorrow. Although showers
will develop again tomorrow across much of the area, the greatest
coverage of showers and highest precipitation totals will occur
across southern Utah. Even across the south, however, generally sub-
advisory snow totals are expected, an inch or less in the valleys
and 2-5 inches in the mountains, with locally higher amounts along
higher peaks such as in the Tushars. Showers will continue on
Thursday as the trough remains in place, its axis cutting across
Utah. Again, showers will remain generally sub-advisory. However,
there is a potential for a deformation axis to set up which could
bring longer-duration precipitation and bump amounts up...something
to monitor.

.LONG TERM (After 00z Friday)...Precipitation is expected to
linger into Thursday evening in the central and southern Utah
mountains as a deep trough slowly nudges eastward. The axis of said
trough translates through Arizona into New Mexico Friday into
Saturday, maintaining a threat of Friday afternoon convective snow
showers in the higher elevations throughout the CWA. Upper level
winds shift to a northeasterly direction for Friday night into
Saturday, promoting a slight chance of upslope convection in the
central/S Utah mtn for Saturday afternoon.

As a high pressure ridge builds off the CA coast, Saturday's local
winds and cold advection from the departing trough will wrestle with
the drying airmass and solar heating to keep a lid on how fast
temperatures rise during the weekend. That said, by Sunday we should
see a return to normal temps across the region, rising to at least 5
degrees F above for the start of the workweek. Models lean toward a
weak shortwave moving through N Utah/SW Wyoming Monday evening into
Tuesday,slowing the warming trend and offering minimal
accumulations.

After the passage of this system, ensemble clusters and global
deterministic models show a building and deepening high pressure
ridge through the week, maintaining a dry airmass and further
increasing temps. A glance at the CPC 8-14 day outlook confirms this
solution, with temps likely above normals and precip likely below
for the period.

&&

.AVIATION...KSLC...VFR conditions will prevail, although scattered
snow showers will be capable of lowering conditions into MVFR range
through around 03Z. Northwest winds will last through around 03Z,
transitioning to southeast after. Mountain obscuration will last
through much of the TAF period, with dry conditions after 03Z, then
scattered snow showers after 18Z.

.REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions will prevail
throughout, although scattered snow showers in southwest Wyoming and
northern Utah and isolated snow showers at KCDC and KBCE will be
capable of MVFR conditions. Snow showers will taper off around 03Z.
Clouds will continue to bring mountain obscuration through the TAF
period, with isolated to scattered snow showers after 18Z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Winter Weather Advisory until 6 PM MDT this evening for UTZ108.

     Winter Weather Advisory until 8 PM MDT this evening for
     UTZ110>113-117.

WY...Winter Weather Advisory until 6 PM MDT this evening for WYZ021.

&&

Cheng/Verzella/Wilson

For more information from NOAA's National Weather Service
visit... http://weather.gov/saltlakecity

In the hours before

Local storm report, Apr 1, 3:12 PM MST, 2 hours 48 minutes before
Preliminary Local Storm Report
National Weather Service Salt Lake City UT
412 PM MDT Tue Apr 01 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0433 AM     Snow             Alta                    40.58N 111.64W
04/01/2025  M9.0 Inch        Salt Lake          UT   Mesonet

            Alta - Collins - 9662 ft

0537 AM     Snow             Brighton                40.62N 111.59W
04/01/2025  M6.0 Inch        Salt Lake          UT   Trained Spotter

            Solitude - 8200 ft

0542 AM     Snow             Alta                    40.57N 111.65W
04/01/2025  M7.0 Inch        Salt Lake          UT   Trained Spotter

            Snowbird - 8100 ft

0600 AM     Snow             Kaysville               41.05N 111.94W
04/01/2025  M0.3 Inch        Davis              UT   Trained Spotter

0603 AM     Snow             Brighton                40.59N 111.58W
04/01/2025  M8.0 Inch        Salt Lake          UT   Trained Spotter

            Brighton Crest - 9500 ft

0609 AM     Snow             Alta                    40.64N 111.64W
04/01/2025  M5.0 Inch        Salt Lake          UT   Trained Spotter

            Big Cottonwood Spruces - 7402 ft

0353 PM     Snow             Park City               40.61N 111.54W
04/01/2025  M14.0 Inch       Summit             UT   Trained Spotter

            Park City Mountain - 9300 ft

0619 AM     Snow             Park City               40.66N 111.57W
04/01/2025  M6.0 Inch        Summit             UT   Trained Spotter

            Canyons Village at Park City - 8800 ft

0247 PM     Snow             Sundance                40.37N 111.59W
04/01/2025  M6.0 Inch        Utah               UT   Mesonet

            Sundance Mid Mountain - 7450 ft

0637 AM     Snow             Nordic Vly              41.38N 111.78W
04/01/2025  M8.0 Inch        Weber              UT   Mesonet

            Powder Mountain - 7500 ft

0645 AM     Snow             Alta                    40.59N 111.64W
04/01/2025  M7.5 Inch        Salt Lake          UT   Trained Spotter

            Alta Udot - 8799 ft

0700 AM     Snow             Bountiful               40.87N 111.85W
04/01/2025  M2.0 Inch        Davis              UT   Trained Spotter

0700 AM     Snow             Oak City                39.37N 112.33W
04/01/2025  M2.0 Inch        Millard            UT   Trained Spotter

0700 AM     Snow             Salt Lake City          40.79N 111.87W
04/01/2025  M2.8 Inch        Salt Lake          UT   Trained Spotter

0700 AM     Snow             Logan                   41.74N 111.86W
04/01/2025  M0.1 Inch        Cache              UT   COOP Observer

0700 AM     Snow             Park City               41.26N 111.84W
04/01/2025  M2.6 Inch        Weber              UT   COOP Observer

0700 AM     Snow             Hyrum                   41.62N 111.83W
04/01/2025  M0.2 Inch        Cache              UT   Trained Spotter

0700 AM     Snow             West Weber              41.24N 112.06W
04/01/2025  M0.1 Inch        Weber              UT   Trained Spotter

0700 AM     Snow             Pleasant View           41.31N 112.00W
04/01/2025  M0.3 Inch        Weber              UT   Trained Spotter

0700 AM     Snow             Fruit Heights           41.05N 111.91W
04/01/2025  M2.0 Inch        Davis              UT   Trained Spotter

0700 AM     Snow             Beaver                  38.28N 112.62W
04/01/2025  M0.6 Inch        Beaver             UT   Trained Spotter

0700 AM     Snow             Clarkston               41.91N 112.05W
04/01/2025  M1.0 Inch        Cache              UT   Trained Spotter

0700 AM     Snow             Taylorsville            40.65N 111.98W
04/01/2025  M0.5 Inch        Salt Lake          UT   Trained Spotter

0700 AM     Snow             West Haven              41.18N 112.09W
04/01/2025  M0.1 Inch        Weber              UT   Trained Spotter

0700 AM     Snow             Richmond                41.92N 111.82W
04/01/2025  M1.1 Inch        Cache              UT   Trained Spotter

0730 AM     Snow             Vernon                  40.08N 112.45W
04/01/2025  M3.0 Inch        Tooele             UT   COOP Observer

0730 AM     Snow             Oakley                  40.71N 111.30W
04/01/2025  M3.0 Inch        Summit             UT   Trained Spotter

0740 AM     Snow             Lyman                   41.32N 110.27W
04/01/2025  M3.5 Inch        Uinta              WY   COOP Observer

0744 AM     Snow             Sandy                   40.58N 111.89W
04/01/2025  M1.0 Inch        Salt Lake          UT   Trained Spotter

0756 AM     Snow             Oak City                39.33N 112.33W
04/01/2025  M2.0 Inch        Millard            UT   COOP Observer

0800 AM     Snow             Trenton                 41.92N 111.91W
04/01/2025  M0.6 Inch        Cache              UT   COOP Observer

0800 AM     Snow             Randolph                41.66N 111.19W
04/01/2025  M1.1 Inch        Rich               UT   COOP Observer

0800 AM     Snow             Ogden                   41.25N 111.94W
04/01/2025  M1.7 Inch        Weber              UT   COOP Observer

0800 AM     Snow             Hanksville              38.26N 110.18W
04/01/2025  M2.6 Inch        Wayne              UT   COOP Observer

0800 AM     Snow             South Weber             41.12N 111.92W
04/01/2025  M0.6 Inch        Davis              UT   Trained Spotter

0800 AM     Snow             Richfield               38.58N 112.33W
04/01/2025  M3.0 Inch        Sevier             UT   COOP Observer

0800 AM     Snow             Callao                  39.89N 113.71W
04/01/2025  M0.2 Inch        Juab               UT   COOP Observer

0800 AM     Snow             Heber City              40.46N 111.23W
04/01/2025  M7.5 Inch        Wasatch            UT   Trained Spotter

0833 AM     Snow             Park City               40.68N 111.50W
04/01/2025  M4.6 Inch        Summit             UT   Trained Spotter

0900 AM     Snow             Heber City              40.47N 111.40W
04/01/2025  M1.5 Inch        Wasatch            UT   Trained Spotter

0900 AM     Snow             Loa                     38.41N 111.64W
04/01/2025  M0.1 Inch        Wayne              UT   COOP Observer

0900 AM     Snow             Eden                    41.33N 111.82W
04/01/2025  M3.0 Inch        Weber              UT   COOP Observer

0900 AM     Snow             Sandy                   40.59N 111.85W
04/01/2025  M1.0 Inch        Salt Lake          UT   Trained Spotter

0900 AM     Snow             West Jordan             40.59N 112.01W
04/01/2025  M1.7 Inch        Salt Lake          UT   Trained Spotter

0930 AM     Snow             Tooele                  40.53N 112.30W
04/01/2025  M2.0 Inch        Tooele             UT   NWS Employee

0933 AM     Snow             Santaquin               39.98N 111.79W
04/01/2025  M5.0 Inch        Utah               UT   Public

0945 AM     Snow             Cottonwood Hgts         40.59N 111.79W
04/01/2025  M3.5 Inch        Salt Lake          UT   Trained Spotter

1000 AM     Snow             Brighton                40.60N 111.58W
04/01/2025  M10.0 Inch       Salt Lake          UT   COOP Observer

1000 AM     Snow             Santaquin               39.96N 111.78W
04/01/2025  M4.5 Inch        Utah               UT   COOP Observer

1000 AM     Snow             Logan                   41.75N 111.83W
04/01/2025  M0.5 Inch        Cache              UT   Trained Spotter

1101 AM     Snow             2 E Bountiful           40.89N 111.84W
04/01/2025  M4.8 Inch        Davis              UT   Public

1101 AM     Snow             Bountiful               40.90N 111.85W
04/01/2025  M5.0 Inch        Davis              UT   NWS Employee

1214 PM     Snow             Salt Lake City          40.79N 111.87W
04/01/2025  M3.0 Inch        Salt Lake          UT   NWS Employee

0217 PM     Snow             Alpine                  40.47N 111.84W
04/01/2025  M3.0 Inch        Utah               UT   NWS Employee

&&

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 debris flow. Local standard time, as filed.

Debris Flow, Utah

When
April 1, 6:00 PM MST to 10:00 PM MST
Where
Utah County, 3.88 mi WNW of Mill Fork to 3.86 mi WNW of Mill Fork
Cause
Heavy Rain / Snow Melt
Property damage
$1,000
Reported by
Broadcast Media
Coordinates
39.989, -111.369

A mud slide happened on U.S. 6 in Spanish Fork Canyon. No vehicles were involved, but both directions were closed for several hours for clean up.

What these are

Debris Flow
A fast-moving slurry of mud, rock and debris, usually on a slope soaked by heavy rain or stripped by a fire.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Utah in 2025Every state in 2025This day in weather historyWarnings in Utah, April 2025

Sources

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: 1235794.