Severe Thunderstorm Warning 30, NWS Salt Lake City, UT

Area Forecast Discussion
National Weather Service Salt Lake City UT
422 PM MDT Thu Jun 13 2019

.SYNOPSIS...A weak slow-moving upper level disturbance will cross
the Great Basin through Friday. High pressure aloft over the Great
Basin Saturday will be followed by another weak disturbance for
late Sunday through Monday.

&&

.SHORT TERM (Through 00Z Monday)...An upper level trough will slowly
move across mainly the northern and central portions of the CWA
tonight through Friday. Upper level jet divergence ahead of this
trough is supporting strong thunderstorm development with hail and
gusty winds the main concern. The high resolution models show
convection to organize into an east-west band across Tooele County
into the central and southern Wasatch Front after 6pm this evening
and move eastward into southwest Wyoming and the Uintas later this
evening. Most of the thunderstorms will die after midnight across
the north and central portions of the CWA. Isolated thunderstorms
will die off over central Utah shortly after sunset.

In the wake of the trough, drier conditions are expected to develop
over extreme northwest Utah Friday, while scattered convection is
expected to redevelop over the rest of northern and central Utah.
Slightly cooler than normal temperatures are expected across central
and northern Utah Friday while the south will be near normal.

A weak ridge will provide drier conditions Saturday but another weak
trough will move into the region Sunday resulting in scattered
afternoon and evening thunderstorms. Temperatures are expected to be
near normal on Sunday.

.LONG TERM (After 00Z Monday)...The weak residual trough across
the Great Basin Sunday night through Monday evening will serve to
maintain fairly widespread convection across much of the forecast
area. Decent moisture (PWAT values hovering around 0.75"), weak
flow aloft and available dynamic support for lift could generate
convection capable of brief heavy rainfall.

A drier and more stable west-northwest flow will follow the
exiting trough Tuesday. Residual moisture should generate
convective cloud cover over/near the higher terrain, though
little in the way of precip is anticipated. A still drier and
warmer air mass will spread across the Great Basin as a low
amplitude upper ridge centered over mid-latitude eastern Pacific
expands east across the western CONUS midweek.

&&

.AVIATION...Showers/thunderstorms near the Nevada border late
this afternoon will continue east and reach the terminal area for
the 00Z to 04Z period. High-based ceilings near 8000 feet along
with gusty and erratic outflow winds will accompany the
showers/storms. Showers and storms should wind down late this
evening with residual ceilings running near 10000 feet late
tonight through Friday morning.

&&

.FIRE WEATHER...A weak trough will bring scattered thunderstorms to
central and northern Utah this afternoon and evening. The extreme
northwest corner of Utah will dry out Friday in the wake of this
trough but scattered thunderstorms will continue Friday, except
remain dry along the Arizona border. Slightly higher RH values are
expected Friday and Saturday. Another trough will bring more
widespread showers back into the region Sunday into Monday.

A drier flow is expected Tuesday through Friday of next week.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Flood Watch through Friday morning for UTZ003.

WY...None.
&&

STRUTHWOLF/CONGER

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
931 PM MDT Wed Jun 12 2019

UTZ001>016-019>021-517-518-WYZ021-131300-
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-
931 PM MDT Wed Jun 12 2019

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

.DAY ONE...Tonight

Warmer temperatures have accelerated snowmelt at the higher
elevations. As a result, waterways will continue to run high,
cold, and swift. Exercise caution near waterways, and keep a
close eye on children and pets.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Warmer temperatures have accelerated snowmelt at the higher
elevations. As a result, waterways will continue to run high,
cold, and swift. The Duchesne River between Hanna and Myton is
expected to exceed flood stage beginning Thursday and remain above
flood stage through at least the early part of next week. Little
Cottonwood Creek is forecast to be near flood stage by Thursday
afternoon. Exercise caution near waterways, and keep a close eye
on children and pets.

A few strong thunderstorms will be possible across northern Utah
Thursday afternoon. These thunderstorms will have the potential
for strong gusty winds and small hail.

.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

Special Weather Statement
National Weather Service Salt Lake City UT
440 PM MDT THU JUN 13 2019

UTZ005-132315-
Great Salt Lake Desert and Mountains UT-
440 PM MDT THU JUN 13 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN TOOELE COUNTY UNTIL
515 PM MDT...

At 439 PM MDT, National Weather Service Doppler radar indicated a
strong thunderstorm 27 miles south of Knolls, or 34 miles west of
Dugway...moving northeast at 20 mph.

Wind gusts to 55 mph will be possible.

Locations impacted include...
Ibapah and the Dugway Proving Grounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4021 11404 4065 11357 4063 11288 4014 11286
      3991 11310 3991 11404 4020 11405
TIME...MOT...LOC 2239Z 208DEG 18KT 4034 11339

Bonnette

Special Weather Statement
National Weather Service Salt Lake City UT
446 PM MDT THU JUN 13 2019

UTZ010-011-132330-
Wasatch Plateau/Book Cliffs UT-Western Uinta Basin UT-
446 PM MDT THU JUN 13 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN DUCHESNE COUNTY UNTIL
530 PM MDT...

At 446 PM MDT, National Weather Service Doppler radar indicated a
strong thunderstorm 14 miles southwest of Duchesne...moving northeast
at 15 mph.

Half inch hail and wind gusts of 40 to 55 mph will be possible.

Locations impacted include...
Duchesne, Myton and Bridgeland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3981 10997 3990 11070 4013 11069 4022 10997
TIME...MOT...LOC 2246Z 247DEG 14KT 3999 11054

Bonnette

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
449 PM MDT THU JUN 13 2019

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

0417 PM     HAIL             IBAPAH                  40.03N 113.98W
06/13/2019  E0.88 INCH       TOOELE             UT   TRAINED SPOTTER

            NICKEL OR SLIGHTLY LARGER.

&&

MCONGER

Special Weather Statement
National Weather Service Salt Lake City UT
456 PM MDT THU JUN 13 2019

UTZ003>005-008-132345-
Wasatch Mountains South of I-80 UT-
Great Salt Lake Desert and Mountains UT-Southern Wasatch Front UT-
Salt Lake and Tooele Valleys UT-
456 PM MDT THU JUN 13 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN SALT LAKE...NORTHWESTERN
UTAH AND EAST CENTRAL TOOELE COUNTIES UNTIL 545 PM MDT...

At 456 PM MDT, National Weather Service Doppler radar indicated a
strong thunderstorm over Cedar Fort, or 16 miles southeast of
Tooele...moving northeast at 20 mph.

Half inch hail and wind gusts of 40 to 55 mph will be possible.

Locations impacted include...
West Valley City, Sandy, Murray, West Jordan, Taylorsville, South
Jordan, Lehi, Draper, Riverton, Cottonwood Heights, Midvale,
Herriman, Eagle Mountain, Alpine, Bluffdale, Cedar Fort, Kearns,
Granite, Oquirrh and Little Cottonwood Creek Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4021 11204 4027 11225 4071 11218 4058 11168
TIME...MOT...LOC 2256Z 203DEG 16KT 4035 11212

Bonnette

Special Weather Statement
National Weather Service Salt Lake City UT
511 PM MDT THU JUN 13 2019

UTZ003>005-015-140015-
Great Salt Lake Desert and Mountains UT-Southern Wasatch Front UT-
West Central Utah UT-Salt Lake and Tooele Valleys UT-
511 PM MDT THU JUN 13 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL MILLARD...CENTRAL
JUAB...SOUTHWESTERN BOX ELDER...WEST CENTRAL UTAH AND TOOELE COUNTIES
UNTIL 615 PM MDT...

At 509 PM MDT, National Weather Service Doppler radar indicated
strong thunderstorms along a line extending from 15 miles northeast
of West Wendover to 16 miles south of Vernon...and moving northeast
at 25 mph.

Half inch hail and wind gusts to 55 mph will be possible.

Locations impacted include...
Interstate 80 from Delle to Wendover, Wendover, Dugway Proving
Grounds, Vernon, Ophir, Fish Springs Wildlife Refuge, Clive, Knolls,
Stockton, Rush Valley, Abraham, Bonneville Salt Flats, Callao,
Faust, Sugarville, Lofgreen and Tintic Junction.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4122 11403 4124 11344 4014 11195 3930 11279
      3930 11332 3954 11336 4017 11406
TIME...MOT...LOC 2309Z 212DEG 22KT 4096 11397 3986 11247

Bonnette

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