Flash Flood Warning 68, NWS Salt Lake City, UT

008 
WGUS75 KSLC 232042
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
242 PM MDT THU AUG 23 2018

UTC017-025-232215-
/O.CON.KSLC.FF.W.0068.000000T0000Z-180823T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Kane UT-
242 PM MDT THU AUG 23 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MDT FOR
SOUTHWESTERN GARFIELD AND NORTHWESTERN KANE COUNTIES...

At 238 PM MDT, Doppler radar indicated over one inch of rain has 
already fallen in the upper Paria River drainage. Flash flooding has 
been reported in Cannonville and Kodachrome Basin State Park. 

Runoff from the heavy rain earlier will continue to cause flash 
flooding in dry washes and small streams in the area through this 
afternoon.

Some locations that will be impacted by flooding include...
Henrieville, Tropic, Cannonville and Kodachrome Basin State Park. 

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 3761 11190 3745 11191 3746 11210 3761 11209

$$

LC

834 
WGUS75 KSLC 232209
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
409 PM MDT THU AUG 23 2018

UTC017-025-232216-
/O.EXP.KSLC.FF.W.0068.000000T0000Z-180823T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Kane UT-
409 PM MDT THU AUG 23 2018

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN GARFIELD AND NORTHWESTERN
KANE COUNTIES WILL EXPIRE AT 415 PM MDT...

The heavy rain has ended in the upper Paria River drainage near 
Cannonville, Henrieville, and Kodachrome Basin State Park. Flooding 
is no longer expected to pose a threat. However, some higher flows 
will continue down the Paria River through this evening.

LAT...LON 3761 11190 3745 11191 3746 11210 3761 11209

$$

LC

Area Forecast Discussion
National Weather Service Salt Lake City UT
1026 AM MDT Thu Aug 23 2018

.SYNOPSIS...High pressure will be in place across the region
through the weekend.

&&

.DISCUSSION...A much quieter day is in store across the CWA this
morning. Thick smoke has taken up residence across northern Utah
and given the upper level flow pattern and experimental HRRR smoke
dispersion guidance, expect smoke to stay in place through at
least tonight. Will evaluate with the 12Z models whether to extend
smoke mentions in the grids passed tonight.

The upper level trough responsible for yesterday's severe weather
outbreak has continued eastward into the northern Rockies and
northern High Plains. A shortwave ridge will build into the area
through the day, gradually drying out the low levels across the
state.

Sufficient moisture will remain in place across the southern third
of Utah to allow for at least isolated to widely scattered
convection. Marginal instability with meager deep layer shear will
favor weak, pulse-type convection mainly oriented on the higher
terrain. Forward propagating Corfidi Vectors favor a eastward
motion to any convection. CAMS support both this evolution and
motion as well.

Updated the forecast to adjust pops based on current model trends.
No additional updates are anticipated at this time.

&&

.AVIATION...Southerly winds at the SLC terminal are expected to
shift to the northwest between 19-21Z.

&&

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

Kruse

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
802 AM MDT THU AUG 23 2018

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

0600 PM     HAIL             TAYLORSVILLE            40.67N 111.93W
08/22/2018  M0.75 INCH       SALT LAKE          UT   PUBLIC

&&

CRK

Special Weather Statement
National Weather Service Salt Lake City UT
100 PM MDT THU AUG 23 2018

UTZ020-518-231930-
Southern Utah Mountains UT-South Central Utah UT-
100 PM MDT THU AUG 23 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN GARFIELD AND
NORTHWESTERN KANE COUNTIES UNTIL 130 PM MDT...

At 1259 PM MDT, National Weather Service Doppler radar indicated a
strong thunderstorm near Henrieville, or 29 miles southwest of
Escalante...moving southeast at 10 mph.

Nickel size hail and winds in excess of 40 mph will be possible.

Locations impacted include...
Henrieville, Cannonville and Kodachrome Basin State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

This storm is capable of producing a significant amount of hail. Hail
may accumulate on area roads resulting in dangerous travel
conditions.

&&

LAT...LON 3753 11212 3760 11208 3755 11191 3743 11197
TIME...MOT...LOC 1859Z 297DEG 10KT 3754 11206

LC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
110 PM MDT THU AUG 23 2018

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

1258 PM     HAIL             CANNONVILLE             37.57N 112.05W
08/23/2018  M1.00 INCH       GARFIELD           UT   PUBLIC

0110 PM     FLASH FLOOD      CANNONVILLE             37.57N 112.05W
08/23/2018                   GARFIELD           UT   PARK/FOREST SRVC

            FLASH FLOODING OCCURRING IN CANNONVILLE INCLUDING WASHES
            IN TOWN.

&&

CRK