Flash Flood Warning 20, NWS Salt Lake City, UT

500 
WGUS75 KSLC 150011
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
611 PM MDT SAT JUL 14 2018

UTC017-025-150200-
/O.CON.KSLC.FF.W.0020.000000T0000Z-180715T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Kane UT-
611 PM MDT SAT JUL 14 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 PM MDT FOR
SOUTH CENTRAL GARFIELD AND NORTHEASTERN KANE COUNTIES...

At 609 PM MDT, heavy rain has ended over Twentyfive Mile Wash, 
Harris Wash, and Coyote Gulch but flooding is still anticipated from 
the earlier rainfall. 

Some locations that will experience flooding include...
Twentyfive Mile Wash, Harris Wash, Alvey Wash, Coyote Gulch

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3766 11121 3758 11111 3740 11095 3746 11152
      3757 11172 3777 11161

$$

MT

805 
WGUS75 KSLC 150154
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
754 PM MDT SAT JUL 14 2018

UTC017-025-150204-
/O.EXP.KSLC.FF.W.0020.000000T0000Z-180715T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Kane UT-
754 PM MDT SAT JUL 14 2018

...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL GARFIELD AND
NORTHEASTERN KANE COUNTIES WILL EXPIRE AT 800 PM MDT...

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

LAT...LON 3766 11121 3758 11111 3740 11095 3746 11152
      3757 11172 3777 11161

$$

MT

Area Forecast Discussion
National Weather Service Salt Lake City UT
1001 AM MDT Sat Jul 14 2018

.SYNOPSIS...Deep moisture will much of the area outside of the far
north through today. A drier airmass from the northwest will
spread into much of the area beginning Sunday.

&&

.DISCUSSION...Morning water vapor and H5 analysis place the upper
ridge axis along the Utah/Colorado border, with the return flow
continuing to advect deep moisture north into the area along the
western periphery of the mid level circulation. Note an upper
short wave currently over east-central Nevada lifting north-
northeast, further driving elevated PWAT back north into northern
Utah over the last several hours. Only gradual moistening is
occurring across the north per surface dew point analysis, with
the bulk of the moisture advection remaining above H7. Very deep
moisture remains across central/southern Utah where dewpoints
range from the mid 50s to low 60s, and PWAT hovers between 1.2-1.5
inches per SPC mesoanalysis.

The primary update this morning was to increase PoPs and lower
temps across the north/west in advance of the approaching short
wave. Dynamic lift in advance of this feature (noted in cooling
cloud tops in IR) has induced scattered showers north of Juab
County, and prolific mid level cloud cover across all of the
north. Continued northeast-east translation of this short wave
will only induce further activity through the day, but convective
potential will be somewhat hampered by meager mid level lapse
rates and suppressed heating.

Focus of the shift will once again revolve around diurnal
convective development and locally heavy rain potential across
central/southern Utah. Veering flow (to near westerly) associated
with the passing wave will aid downstream propagation of terrain
based cells across central portions (increased flash flood
potential for Capitol Reef), while light flow across the south
coupled with primed low levels should once again promote down-
drainage propagation of terrain based cells (initially) along
developing outflow boundaries, continuing well into the evening.
Previous discussion below...

.PREVIOUS DISCUSSION...In the wake of the passing wave the models
have been consistent in spreading subsidence and much drier air
into the area Sunday. This will likely limit any convective threat
to the far south with only isolated coverage. This drier air will
remain in place into the day Monday, again resulting in little if
any convective threat during the day. By Monday evening a
shortwave trough which is forecast to brush by northern Utah is
expected to spread convection out of Nevada and into northwest
Utah. Have introduced slight chance PoPs across northwestern Utah
for this time period.

Additional convection influenced by the passing trough, particularly
across the northwest, could continue into early Tuesday, before
the trough axis passes east of the area by Tuesday afternoon.
After this initial bit of forcing, the larger impact may be that
the trough ushers in a drier airmass to northern Utah behind the
wave, potentially confining showers and thunderstorms to the
southern portions of the forecast area Tuesday and Wednesday
afternoons.

The shifting upper level high looks to pass overhead on Wednesday,
and then center itself east of the area for Thursday onward. This
pattern could allow a significant return of moisture to Utah from
the south on Thursday and Friday, with showers once again possible
area-wide. Have generally increased POPs across the area Thursday
through Saturday, with temperatures dropping off a little bit
heading into the weekend after a very warm Wednesday and Thursday.

&&

.AVIATION....Showers will be in the vicinity of the terminal
through the late morning/early afternoon. Despite these showers
expect ceilings to generally stay above 7k ft and VFR conditions
to prevail through the day. Light southerly winds (at times
variable this AM due to showers) are expected to shift to
northerly around 17-18Z.

&&

.FIRE WEATHER...Ample moisture remains in place across central
and southern Utah this morning, and should allow for another round
of showers and thunderstorms capable of producing heavy rainfall.
A weak weather system passing through the north will help
temporarily pull some of this moisture into the north as well,
allowing for a chance of showers and thunderstorms through this
evening. High pressure will follow on Sunday allowing for a drying
trend, which will likely continue into the upcoming week.

&&

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

DISCUSSION/AVIATION...Merrill/Carr
PREVIOUS DISCUSSION...Seaman/Schoening

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
643 AM MDT Sat Jul 14 2018

UTZ001>016-019>021-517-518-WYZ021-151200-
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-
643 AM MDT Sat Jul 14 2018

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

.DAY ONE...Today and Tonight

Showers and thunderstorms will be possible across the outlook area
through this evening. A threat of locally heavy rainfall and
isolated flash flooding exists across central and southern Utah.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

High pressure will bring a drying trend across the area Sunday
into Monday. This high will strengthen by midweek bringing hot
temperatures to the region.

.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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
131 PM MDT SAT JUL 14 2018

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

0915 PM     FLASH FLOOD      WASHINGTON              37.13N 113.49W
07/13/2018                   WASHINGTON         UT   EMERGENCY MNGR

            FLASH FLOODING IN THE NORTHEASTERN PART OF WASHINGTON
            CITY DAMAGED APPROXIMATELY SIX HOMES.

&&

MT

Special Weather Statement
National Weather Service Salt Lake City UT
302 PM MDT SAT JUL 14 2018

UTZ016-019-518-142130-
Southwest Utah UT-Southern Utah Mountains UT-
Utah's Dixie and Zion National Park UT-
302 PM MDT SAT JUL 14 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WASHINGTON AND
SOUTHERN IRON COUNTIES UNTIL 330 PM MDT...

At 300 PM MDT, National Weather Service Doppler radar indicated an
area of thunderstorms over northern Washington county between
Goldstrike and Pine Valley...moving southeast at 10 mph.

Penny to nickel size hail and winds in excess of 40 mph will be
possible.

Locations impacted include...
New Harmony, Enterprise, Pinto, Pine Valley, Veyo and Goldstrike.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If threatening weather approaches, take shelter in a sturdy building.

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

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Salt Lake City.

&&

LAT...LON 3733 11399 3758 11390 3753 11325 3724 11338
TIME...MOT...LOC 2100Z 301DEG 7KT 3737 11374

MT