Flash Flood Warning 94, NWS Salt Lake City, UT

057 
WGUS75 KSLC 302107
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
307 PM MDT Sun Aug 30 2026

UTC025-302215-
/O.CON.KSLC.FF.W.0094.000000T0000Z-260830T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
307 PM MDT Sun Aug 30 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MDT THIS
AFTERNOON FOR SOUTHWESTERN KANE COUNTY...

At 307 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across Johnson Wash. Between 0.5 and 1.25 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar indicated.

IMPACT...Life threatening flash flooding of creeks, streams, slot
         canyons,  and normally dry washes.

Some locations that will experience flash flooding include...
  Johnson Wash and Johnson Lakes Canyon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.

Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.

&&

LAT...LON 3719 11247 3719 11224 3700 11228 3700 11242
      3707 11244

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

JAC

036 
WGUS75 KSLC 302212
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
412 PM MDT Sun Aug 30 2026

UTC025-302222-
/O.EXP.KSLC.FF.W.0094.000000T0000Z-260830T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
412 PM MDT Sun Aug 30 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 415 PM MDT THIS AFTERNOON FOR
SOUTHWESTERN KANE COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.

A Flood Watch remains in effect until 900 PM MDT Monday for portions
of central, southern, and southwest Utah.

&&

LAT...LON 3719 11247 3719 11224 3700 11228 3700 11242
      3707 11244

$$

JAC

Area Forecast Discussion
National Weather Service Salt Lake City UT
1223 PM MDT Sun Aug 30 2026

.KEY MESSAGES, Issued 1009 PM MDT Sat Aug 29 2026...

- Thunderstorms capable of periods of heavy rain and flash
  flooding will once again be possible Sunday and Monday,
  particularly east of the I-15 corridor and south of I-80. A
  Flood Watch is in effect.

- A few isolated thunderstorms may become strong to severe Sunday
  and Monday, capable of strong winds and hail.

- Generally drier conditions return Tuesday on through the work
  week, though more isolated showers and thunderstorms will remain
  a possibility many of those days.

&&

.DISCUSSION, Issued 1009 PM MDT Sat Aug 29 2026...
After an active day, weather remains active across
portions of Utah this evening. This is to an extent the result of
a deepening PacNW trough helping to strengthen a Pacific moisture
tap within the associated enhanced southwesterly flow. To that
end, mesoanalysis maintains widespread PWAT values in excess of 1"
across the majority of Utah, or around 150-200% of climatological
normal for late August. Further, the aforementioned deepening
PacNW trough has allowed a frontal boundary to slowly advance into
northern Utah, and the abnormally strong deep layer flow overhead
has allowed for impressive effective shear on the order of 40-60
kts across the northern half of Utah, and around 20-40 kts across
southern Utah. This anomalous combination of ingredients has
yielded numerous strong to severe thunderstorms with strong winds
and hail, and heavy rain resulting in multiple instances of flash
flooding.

Looking ahead to the overnight hours, while overall instability
will decrease with the lack of sun, enough will remain in
combination with ample moisture to result in continued showers and
thunderstorms. In general, anticipate these to tend to be weaker
than those during the daytime Saturday. That said, wouldn't rule
out one or two pulsing up at times, and with the moisture rich
environment, any stronger Storm or training storm impacting a rain
sensitive basin in particular could pose a flash flood threat. In
terms of coverage, models largely support the bulk of the
scattered activity across portions of central Utah, in the rough
vicinity near and to the south of the frontal boundary.

Sunday appears to have potential to be another active day capable
of strong storms and flash flooding. In terms of the broader
synoptic environment, the ingredients don't appear to change
significantly, with an embedded midlevel shortwave impulse also
shifting through. Strong flow will remain overhead allowing
moisture will continue to advect into the region. One difference
is it appears some slightly drier air will start to shift into
Utah from the west, with the best available moisture becoming
positioned across eastern Utah to southwest Wyoming, generally
along/east of the I-15 corridor and south of I-80. As such, this
area is highlighted as Slight Risk (categorical 2/4) for excessive
rainfall from WPC, and much of it is also included in a Flood
Watch for potential flash flooding. Elsewhere across all but far
west to northwest Utah, a Marginal Risk (categorical 1/4) of
excessive rainfall is noted. These areas will need to remain
weather aware for strong storms capable of periods of heavy
rainfall once again, with flash flooding especially possible in
those typically sensitive basins (recent burn scars, slot canyons,
typically dry washes, and slickrock areas). One possible
difference is that shear appears to be maybe around 20 kts or so
weaker than Saturday, which may limit the coverage of strong to
severe storms. Still, would anticipate a few organized storms will
still be capable of strong gusty winds and hail.

Monday will yet again see the potential for flash flooding and
strong storms. Overall, the synoptic elements once again do not
shift significantly, and another shortwave impulse will lift
through overhead during the day. Like Sunday, the expectation is
that while strong to maybe a few severe storms will certainly be
possible, the moisture rich environment will favor flash flooding
as the primary risk. As far as the excessive rainfall outlook, the
slight and marginal risk areas change very little from that of
Sunday, and thus the same areas will remain more favored for the
threat. With multiple days of repeat thunderstorms, saturated
soils and any remaining high creeks/rivers/etc. may further
exacerbate this potential.

The deep PacNW trough will more or less maintain its position
Tuesday onward through the upcoming week, but the moisture tap
will become less defined. As such, a general drying trend is
expected across the forecast region, and the threat of widespread
heavy rainfall generally appears lower. Still, the PacNW trough
will offer potential for some grazing shortwaves, and there will
still be enough moisture lingering to result in the development of
some showers and thunderstorms day to day. Even if the threat of
widespread heavy rain may be lower, any stronger or slower moving
storm that gets over a rain sensitive basin will pose a risk, so
cannot say the threat is zero. Overall though, there is some
uncertainty noted in the day to day specifics.

Though on the tail end of the forecast range, next weekend bears
at least some watching. Deterministic models show potential for
the Pacific moisture tap to become reestablished, with ensembles
showing a corresponding increase in mean PWAT values. It does
appear there are some factors that'll influence how it trends
though, particularly the exact position of the PacNW trough, a
broad central Plains to Rockies ridge, and position/strength (if
it exists) of an east Pacific tropical system. So, not much in the
way of specifics, but as typically the case a week out, worth
watching trends.

&&

.AVIATION, Issued 1154 AM MDT Sun Aug 30 2026...

KSLC...Primarily VFR conditions are expected to persist through the
TAF period. Confidence regarding thunderstorms remaining away from
the terminal this afternoon has increased, resulting in the removal
of the PROB30. Otherwise, diurnal wind shifts are expected with the
next wind shift expected to occur around 19z as northwest winds push
into the area.

REST OF UTAH AND SOUTHWEST WYOMING...Showers and thunderstorms with
gusty outflows are expected this afternoon at KPVU, KHCR, and KCDC
from 20-24z, though some may linger a couple hours later. Otherwise,
diurnal flows will prevail at all other sites with VFR conditions
persisting.

&&

.FIRE WEATHER...An ongoing monsoon surge will continue to bring the threat
of thunderstorms with strong winds, hail and very heavy rain
today. A further increase in moisture will bring an even higher
threat of heavy rain Monday, especially across southern and
eastern Utah.

A drying trend will begin Tuesday, with humidities falling to
near critical levels across western Utah by Wednesday. Friday into
the weekend, moisture will again shift into the region with
increasing humidities and the threat of heavy rainfall once again.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Flood Watch through Monday evening for UTZ116>121-123>131.

WY...None.
&&

PUBLIC...Warthen
AVIATION...Worster
FIRE WEATHER...Kruse

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

Special Weather Statement
National Weather Service Salt Lake City UT
736 AM MDT Sun Aug 30 2026

UTZ106-108-111>113-301415-
Wasatch Back UT-Wasatch Plateau/Book Cliffs UT-Utah Valley UT-
Western Uinta Mountains UT-Wasatch Mountains South of I-80 UT-
736 AM MDT Sun Aug 30 2026

...A strong thunderstorm will impact portions of southeastern Salt
Lake, northern Wasatch, southwestern Summit and north central Utah
Counties through 815 AM MDT
...

At 736 AM MDT, Doppler radar was tracking a strong thunderstorm near
Lindon, or 9 miles north of Provo, moving east at 50 mph.

HAZARD...Wind gusts of 50 to 55 mph and nickel 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...
Provo, Park City, Heber City, Orem, Lehi, Draper, Pleasant Grove,
American Fork, Heber, Lindon, Alpine, Kamas, Oakley, Francis, Daniel,
Vineyard, Wasatch Mountain State Park, Samak, Timber Lakes, and
Little Cottonwood Canyon.

This includes the following highways...
 Interstate 15 between mile markers 269 and 279.
 US Route 40 between mile markers 6 and 34.
 Utah Route 35 between mile markers 0 and 21.
 Mirror Lake Highway between mile markers 0 and 17.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4026 11184 4050 11183 4086 11100 4032 11101
TIME...MOT...LOC 1336Z 254DEG 44KT 4038 11165

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...55 MPH

CRK

Special Weather Statement
National Weather Service Salt Lake City UT
814 AM MDT Sun Aug 30 2026

UTZ112-114-301500-
Western Uinta Basin UT-Western Uinta Mountains UT-
814 AM MDT Sun Aug 30 2026

...A strong thunderstorm will impact portions of northeastern Wasatch
and northwestern Duchesne Counties through 900 AM MDT
...

At 814 AM MDT, Doppler radar was tracking a strong thunderstorm 7
miles east of Timber Lakes, or 15 miles east of Heber City, moving
east at 45 mph.

HAZARD...Wind gusts of 50 to 55 mph and penny 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...
Timber Lakes, Moon Lake, Mountain Home, and Hanna.

This includes Utah Route 35 between mile markers 11 and 41.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4033 11125 4037 11128 4053 11130 4066 11041
      4039 11035
TIME...MOT...LOC 1414Z 260DEG 38KT 4044 11111

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...55 MPH

CRK

Special Weather Statement
National Weather Service Salt Lake City UT
1022 AM MDT Sun Aug 30 2026

UTZ120-121-301700-
San Rafael Swell UT-Castle Country UT-
1022 AM MDT Sun Aug 30 2026

...A strong thunderstorm will impact portions of central Emery County
through 1100 AM MDT
...

At 1021 AM MDT, Doppler radar was tracking a strong thunderstorm 20
miles south of Clawson, or 39 miles southeast of Manti, moving
northeast at 40 mph.

HAZARD...Wind gusts of 50 to 55 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.

This storm will remain over mainly rural areas of central Emery
County.

This includes the following highways...
 Interstate 70 between mile markers 105 and 152.
 Utah Route 24 between mile markers 159 and 160.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3876 11108 3893 11120 3921 11048 3892 11031
TIME...MOT...LOC 1621Z 246DEG 35KT 3884 11115

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

CRK

Preliminary Local Storm Report
National Weather Service Salt Lake City UT
1158 AM MDT Sun Aug 30 2026

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

0454 PM     Hail             Leamington              39.53N 112.28W
08/29/2026  M1.25 Inch       Millard            UT   Public

            Half dollar sized hail reported via social
            media. Time estimated by radar.

&&

JCW

Preliminary Local Storm Report
National Weather Service Salt Lake City UT
1159 AM MDT Sun Aug 30 2026

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

0447 PM     Hail             1 NE Lynndyl            39.52N 112.38W
08/29/2026  M1.00 Inch       Millard            UT   Public

            Corrects previous tstm wnd dmg report from 1
            NE Lynndyl. Social media reports of quarter
            sized hail. Time estimated via radar.

&&

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
1216 PM MDT Sun Aug 30 2026

UTZ128-301900-
South Central Utah UT-
1216 PM MDT Sun Aug 30 2026

...A strong thunderstorm will impact portions of southwestern Kane
County through 100 PM MDT
...

At 1216 PM MDT, Doppler radar was tracking a strong thunderstorm over
Kanab, moving northeast at 25 mph.

HAZARD...Wind gusts up to 50 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...
Kanab.

This includes US Route 89 between mile markers 54 and 70.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3704 11265 3733 11235 3714 11215 3700 11242
      3700 11258
TIME...MOT...LOC 1816Z 225DEG 23KT 3705 11250

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

JCW