Flash Flood Warning 11, NWS Salt Lake City, UT

689 
WGUS75 KSLC 130123
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
723 PM MDT THU JUL 12 2018

UTC053-130230-
/O.CON.KSLC.FF.W.0011.000000T0000Z-180713T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington UT-
723 PM MDT THU JUL 12 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM MDT FOR
SOUTHWESTERN WASHINGTON COUNTY...

At 719 PM MDT, As a result of extensive flash flooding in the 
Dameron Valley area, several homes sustained damage due to the 
floods.  Additionally, SR18 was closed due to water, mud, and debris 
closing the road.

Rainfall continues in the area and flash flooding is anticipated to 
last through the evening hours.  If you anticipate traveling through 
this area, please be vigilant for flood debris on the roadways and 
in the area.

Some locations that will experience flooding include...
St George, Santa Clara, Ivins, Gunlock, Veyo and Snow Canyon State
Park.

LAT...LON 3732 11350 3709 11361 3722 11389 3739 11376

$$

McInerney/Bonnette

838 
WGUS75 KSLC 130222
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
822 PM MDT THU JUL 12 2018

UTC053-130230-
/O.EXP.KSLC.FF.W.0011.000000T0000Z-180713T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington UT-
822 PM MDT THU JUL 12 2018

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN WASHINGTON COUNTY WILL
EXPIRE AT 830 PM MDT...

While thunderstorm activity has slowed in the area, and the majority 
of the high flows have receded, the area around Dameron Valley 
remains hazardous.

If you are moving through this area, please watch out for standing 
water and residual high flows through the evening and nighttime 
hours.

 LAT...LON 3732 11350 3709 11361 3722 11389 3739 11376

$$

McInerney

Area Forecast Discussion
National Weather Service Salt Lake City UT
332 PM MDT Thu Jul 12 2018

.SYNOPSIS...High pressure over the Great Basin will gradually
shift southward through the weekend, bringing a drying trend over
the northern and central sections of the forecast area. Moisture
will linger over far southern Utah into the weekend.

&&

.SHORT TERM (Through 06Z Monday)...An elongated ridge axis
remains in place across the region this afternoon. Widespread
convection has developed across portions of central and southern
Utah this afternoon despite a fair amount of convective cloud
debris.

Surface dewpoints remain in the 50s and even a few locations in
the 60s this afternoon. Given the moisture levels, more than
adequate instability for pulse convection has developed this
afternoon. As anticipated, deep layer shear is negligible across
much of the state. With the ridge overhead, any synoptic scale
forcing is also negligible.

Afternoon convection has been cold pool/outflow dominated as
expected. This will continue. Much of the CAM guidance supports a
general progression toward an area of convection congealing across
southwest Utah and then move southwestward into the low desert
near Zion National Park and St. George. This may present a flash
flood threat this afternoon and evening across south central and
southwestern Utah.

With drier northwest flow across northern Utah Friday, deeper
moisture will begin to shift southward with outflow dominant
convection mainly impact southern Utah Friday afternoon and
evening. Similar threat exists to today...with collapsing cold
pools creating a persistent area of convection that may impact
southwestern and south central Utah during the late afternoon and
evening. Burn scars across southern Utah will also be vulnerable
once again. Given how widespread convection has been the past few
days, held off on issuing a flood watch for Friday...but this is
something the mid shift will have to consider.

Expect the deepest moisture for the weekend to be across far
southern Utah. The heavy rainfall threat will persist.

.LONG TERM (After 06Z Monday)...Global models continue to diverge
from Monday onward, as the GFS brings a weak shortwave into the
northern forecast area, while ridging continues in the ECMWF. The
GFS solution shuffles precipitation through the north into central
Utah, while the EC continues a moisture flux in the south, with a
southerly mid level flow pushing moisture farther north into Utah by
Tuesday. Thus continued with slight to chance wording for showers
and thunderstorms over much of southern Utah, as well as higher
terrain of northern and central sections of forecast area.
Both the GFS and EC show 7H temperatures warming into midweek,
keeping surface temps well above normals through the end of the
forecast period.

&&

.AVIATION...VFR conditions are expected through the TAF period at
the SLC terminal. Winds will remain NW until about 03Z then shift to
the SE.

&&

.FIRE WEATHER...Deep moisture will remain in place across
southern Utah for the next several days, while drier air slowly
pushes southward...first across northern Utah and then across
central Utah Friday into Saturday. This will result in a decrease
in convective coverage with the decrease in moisture.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...None.
WY...None.
&&

Kruse/Verzella/Struthwolf

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

Hazardous Weather Outlook
National Weather Service Salt Lake City UT
451 AM MDT Thu Jul 12 2018

UTZ001>016-019>021-517-518-WYZ021-131100-
Cache Valley/Utah Portion-Northern Wasatch Front-
Salt Lake and Tooele Valleys-Southern Wasatch Front-
Great Salt Lake Desert and Mountains-Wasatch Mountain Valleys-
Wasatch Mountains I-80 North-Wasatch Mountains South of I-80-
Western Uinta Mountains-Wasatch Plateau/Book Cliffs-
Western Uinta Basin-Castle Country-San Rafael Swell-
Sanpete/Sevier Valleys-West Central Utah-Southwest Utah-
Utahs Dixie and Zion National Park-South Central Utah-
Glen Canyon Recreation Area/Lake Powell-Central Mountains-
Southern Mountains-Southwest Wyoming-
451 AM MDT Thu Jul 12 2018

This Hazardous Weather Outlook is for the western two thirds of
Utah and southwest Wyoming.

.DAY ONE...Today and Tonight

With a rather moist air mass in place, showers and thunderstorms
will be scattered over central and southern Utah, primarily this
afternoon and evening. The primary concern is the potential for
heavy rain over southern Utah, with flash flooding a possibility.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

There will be a potential for showers and thunderstorms,
primarily over southern Utah and the higher terrain of central
Utah, through the period.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

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

For information on potential road travel impacts visit...
http://www.udottraffic.utah.gov/roadweatherforecast.aspx