Flash Flood Warning 39, NWS Salt Lake City, UT

401 
WGUS75 KSLC 262224
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
424 PM MDT Tue Jul 26 2022

UTC017-270045-
/O.CON.KSLC.FF.W.0039.000000T0000Z-220727T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-
424 PM MDT Tue Jul 26 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MDT THIS 
EVENING FOR WEST CENTRAL GARFIELD COUNTY...

At 424 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 1.5 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.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Red Canyon and Hillsdale.

This includes the following highways...
	US Route 89 near mile marker 124.
	Utah Route 12 between mile markers 0 and 6.

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 3783 11228 3781 11225 3772 11227 3772 11231
      3773 11235 3774 11238 3776 11238 3779 11237
      3781 11232

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

$$

MPS

975 
WGUS75 KSLC 270040
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
640 PM MDT Tue Jul 26 2022

UTC017-270050-
/O.EXP.KSLC.FF.W.0039.000000T0000Z-220727T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-
640 PM MDT Tue Jul 26 2022

...FLASH FLOOD WARNING WILL EXPIRE AT 645 PM MDT THIS EVENING FOR 
WEST CENTRAL GARFIELD COUNTY...

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

LAT...LON 3783 11228 3781 11225 3772 11227 3772 11231
      3773 11235 3774 11238 3776 11238 3779 11237
      3781 11232

$$

MPS

Area Forecast Discussion
National Weather Service Salt Lake City UT
358 AM MDT Tue Jul 26 2022

.SYNOPSIS...A very moist airmass will remain in place across
southern Utah while northern Utah and southwest Wyoming remains on
the drier side through at least midweek.

&&

.SHORT TERM (Through 12Z Thursday)...Morning satellite and upper
air analysis indicates pronounced troughing across the northern
Plains, with a robust monsoonal pattern across the Desert
Southwest. Looking at water vapor imagery, there appears to be a
circulation west of Laredo, TX. Relatively subtle convectively
induced shortwave troughs and potentially an MCV or two from
earlier convection is suggested across portions of Arizona.

PWAT values remain quite elevated across southern Utah,
particularly across Washington, Iron, Kane and Garfield Counties.
HREF mean SBCAPE values are ranging a bit higher than yesterday by
afternoon; between 750-1250 J/kg. Deep layer shear is again weak
and storm motions will favor downscale development into
instability pools.

Monday, convection developed over the higher terrain across
southwestern Utah and shifted into lower Washington County earlier
than typical. With more instability, cold pool/shear balance may
be more achievable, allowing the cold pool to become deeper and
more significant over the higher terrain before building downscale
into Washington County.

This is supported again by the bulk of the CAMs and conceptual
models. This is the prototypical pattern for flash flooding
across Washington County...and a flood watch remains in effect for
portions of southern Utah this afternoon and evening. Given heavy
rain fell on lower Washington County Monday, runoff may be more
enhanced today as well.

Wednesday will be another day of convection across the same
general area as Tuesday. HREF Ensemble Mean SBCAPE values are
actually higher across southern Utah Wednesday compared to
Tuesday. Deep layer shear remains weak. Current indications are
there may be another round of thunderstorms moving through
Washington/Kane County producing a threat of flash flooding. Day
shift may need to once again consider extending the flood watch
through Wednesday evening.

.LONG TERM (After 12Z Thursday)...The period will open with a
ridge of high pressure stretched across the Eastern Great Basin.
Deterministic models suggest a weak southerly flow advecting
moisture northward to portions of central and northeast Utah
during the day on Thursday, with deeper moisture remaining over
southern Utah.

Ensembles are in general agreement with building the ridge of
high pressure over the Western Great Basin from Friday into the
weekend, promoting a weak northerly flow over northern and central
Utah, aiding in some drying of the air mass. This stated, enough
residual moisture will remain to support continued chances for
precipitation across southern Utah and portions of central and
northeast Utah.

Ensembles solutions diverge from Sunday into Tuesday. The vast
majority of members from the CMC, GEFS, and ECMWF shift the ridge
axis slowly eastward, centering it over the Colorado Rockies by
Tuesday. Differences do exist with roughly a third of the members
shifting the ridge eastward quicker, favoring a return of deep
moisture to much of the forecast area on Monday.

Temperatures will remain a bit above normal over northern Utah
and extreme southwest Wyoming through the period, with seasonal
values across the remainder of the forecast area.

&&

.AVIATION...KSLC...VFR conditions will prevail throughout the
entire period for the KSLC terminal. A southeast drainage wind
will shift to a northwest lake breeze around 18Z, enhanced a bit
by a weak westerly wind aloft.

.REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions will prevail
across northern and central Utah and extreme southwest Wyoming
throughout the period. With monsoonal moisture in place across
southern Utah, expect convection to develop this afternoon, as
early as 19Z in favored terrain areas including KBCE. Could see
MVFR/IFR conditions with thunderstorms. Showers and thunderstorms
will likely persist into the evening, especially across southwest
Utah including the KSGU vicinity.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Flood Watch through this evening for UTZ123-124-128>131.

WY...None.
&&

Kruse/Barjenbruch

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

For frequently asked questions about the Area Forecast Discussion
visit...
http://weather.gov/saltlakecity/general/afd_faqs.php