Alert archive / Wyoming / Winter Storm Watches in 2021

Winter Storm Watch 4, NWS Salt Lake City, UT

March 11, 2021Uinta County, Wyoming

NWS Salt Lake City, UT issued this winter storm watch at Mar 11, 2021, 2:08 PM MST for Uinta County, Wyoming. It took effect at Mar 13, 2021, 5:00 AM MST. It was in force for .

The area

The counties it named.

The facts

Issued
Mar 11, 2021, 2:08 PM MST (21:08 UTC)
In effect from
Mar 13, 2021, 5:00 AM MST
Expired
Mar 12, 2021, 2:09 PM MST
In force
Issued by
NWS Salt Lake City, UT

County Uinta County, WY

The radar

The Salt Lake City radar (KMTX), 159 km from the middle of the area, began a volume at 21:12 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 9.1 hours before the alert went out and 127 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Salt Lake City I, UT at 12:00Z on 2021-03-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 2021-03-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1160 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

724 
WWUS45 KSLC 112108
WSWSLC

URGENT - WINTER WEATHER MESSAGE
National Weather Service Salt Lake City UT
208 PM MST Thu Mar 11 2021

UTZ009-120515-
/O.NEW.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
Western Uinta Mountains-
Including the city of Mirror Lake Highway
208 PM MST Thu Mar 11 2021

...WINTER STORM WATCH IN EFFECT FROM LATE FRIDAY NIGHT THROUGH
SUNDAY AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of 8 to 20
  inches possible. Winds could gust as high as 45 mph resulting in
  areas of blowing snow.

* WHERE...Western Uinta Mountains, with the highest amounts on the
  north slope.

* WHEN...From late Friday night through Sunday afternoon.

* IMPACTS...Backcountry travel and recreation could be impacted by
  heavy snow and blowing snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

WYZ021-120515-
/O.NEW.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
Southwest Wyoming-
Including the city of Evanston
208 PM MST Thu Mar 11 2021

...WINTER STORM WATCH IN EFFECT FROM LATE FRIDAY NIGHT THROUGH
SUNDAY AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of up to 12
  inches. 

* WHERE...Uinta County, Wyoming. Heaviest snow across 
  southeastern portions of the county, south of I-80.

* WHEN...From late Friday night through Sunday afternoon.

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

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

For information on potential travel impacts visit...
http://udottraffic.utah.gov/roadweatherforecast.aspx
5 follow-up statements
649 
WWUS45 KSLC 120559
WSWSLC

URGENT - WINTER WEATHER MESSAGE
National Weather Service Salt Lake City UT
1059 PM MST Thu Mar 11 2021

UTZ009-130000-
/O.CON.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
Western Uinta Mountains-
Including the city of Mirror Lake Highway
1059 PM MST Thu Mar 11 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE FRIDAY NIGHT
THROUGH SUNDAY AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of 8 to 
  20 inches possible. Winds could gust as high as 45 mph 
  resulting in areas of blowing snow.

* WHERE...Western Uinta Mountains, with the highest amounts on 
  the north slope.

* WHEN...From late Friday night through Sunday afternoon.

* IMPACTS...Backcountry travel and recreation could be impacted by
  heavy snow and blowing snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

WYZ021-130000-
/O.CON.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
Southwest Wyoming-
Including the city of Evanston
1059 PM MST Thu Mar 11 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE FRIDAY NIGHT
THROUGH SUNDAY AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of up to 
  12 inches.

* WHERE...Uinta County, Wyoming. Heaviest snow across 
  southeastern portions of the county, south of I-80.

* WHEN...From late Friday night through Sunday afternoon.

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

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

For information on potential travel impacts visit...
http://udottraffic.utah.gov/roadweatherforecast.aspx
034 
WWUS45 KSLC 121125
WSWSLC

URGENT - WINTER WEATHER MESSAGE
National Weather Service Salt Lake City UT
425 AM MST Fri Mar 12 2021

UTZ016-518-122300- /O.NEW.KSLC.WW.Y.0011.210312T2300Z-
210313T1600Z/ Southwest Utah-Southern Mountains- Including the 
cities of Beaver, Cedar City, Milford, Loa, Panguitch, and Bryce 
Canyon 423 AM MST Fri Mar 12 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO
9 AM MST SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 6 inches
  along the I-15 corridor and Cedar City area, with 5 to 10 
  inches in the mountains.

* WHERE...Southwest Utah and Southern Mountains.

* WHEN...From 4 PM this afternoon to 9 AM MST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Snowfall will be most likely to stick to
  area roads during the overnight and early morning hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

For winter road conditions from the Utah Department of
Transportation, visit
http://www.udottraffic.utah.gov/roadweatherforecast.aspx or dial
511.

&&

$$

UTZ009-122300-
/O.CON.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
Western Uinta Mountains-
Including the city of Mirror Lake Highway
425 AM MST Fri Mar 12 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of 8 to 
  20 inches possible. Winds could gust as high as 45 mph 
  resulting in areas of blowing snow.

* WHERE...Western Uinta Mountains, with the highest amounts on 
  the north slope.

* WHEN...From late Friday night through Sunday afternoon.

* IMPACTS...Backcountry travel and recreation could be impacted 
  by heavy snow and blowing snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

WYZ021-122300-
/O.CON.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
Southwest Wyoming-
Including the city of Evanston
425 AM MST Fri Mar 12 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of up to 
  12 inches.

* WHERE...Uinta County, Wyoming. Heaviest snow across 
  southeastern portions of the county, south of I-80.

* WHEN...From late Friday night through Sunday afternoon.

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

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

For information on potential travel impacts visit...
http://udottraffic.utah.gov/roadweatherforecast.aspx
562 
WWUS45 KSLC 121247
WSWSLC

URGENT - WINTER WEATHER MESSAGE
National Weather Service Salt Lake City UT
547 AM MST Fri Mar 12 2021


UTZ016-518-122300-
/O.NEW.KSLC.WW.Y.0011.210312T2300Z-210313T1600Z/
Southwest Utah-Southern Mountains-
Including the cities of Beaver, Cedar City, Milford, Loa, 
Panguitch, and Bryce Canyon
547 AM MST Fri Mar 12 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO
9 AM MST SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 6 inches
  along the I-15 corridor and Cedar City area, with 5 to 10 
  inches in the mountains.

* WHERE...Southwest Utah and Southern Mountains.

* WHEN...From 4 PM this afternoon to 9 AM MST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Snowfall will be most likely to stick to
  area roads during the overnight and early morning hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

For winter road conditions from the Utah Department of
Transportation, visit
http://www.udottraffic.utah.gov/roadweatherforecast.aspx or dial
511.

&&

$$

UTZ009-122300-
/O.CON.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
Western Uinta Mountains-
Including the city of Mirror Lake Highway
547 AM MST Fri Mar 12 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of 8 to 
  20 inches possible. Winds could gust as high as 45 mph 
  resulting in areas of blowing snow.

* WHERE...Western Uinta Mountains, with the highest amounts on 
  the north slope.

* WHEN...From late Friday night through Sunday afternoon.

* IMPACTS...Backcountry travel and recreation could be impacted 
  by heavy snow and blowing snow.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

WYZ021-122300-
/O.CON.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
Southwest Wyoming-
Including the city of Evanston
547 AM MST Fri Mar 12 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of up to 
  12 inches.

* WHERE...Uinta County, Wyoming. Heaviest snow across 
  southeastern portions of the county, south of I-80.

* WHEN...From late Friday night through Sunday afternoon.

* IMPACTS...Travel could be very difficult.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

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

For information on potential travel impacts visit...
http://udottraffic.utah.gov/roadweatherforecast.aspx
524 
WWUS45 KSLC 121748
WSWSLC

URGENT - WINTER WEATHER MESSAGE
National Weather Service Salt Lake City UT
1048 AM MST Fri Mar 12 2021

UTZ518-130200-
/O.EXT.KSLC.WW.Y.0011.210312T1748Z-210313T1600Z/
Southern Mountains-
Including the cities of Loa, Panguitch, and Bryce Canyon
1048 AM MST Fri Mar 12 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 9 AM MST
SATURDAY...

* WHAT...Snow. Additional snow accumulations of 5 to 10 inches.

* WHERE...Southern Mountains.

* WHEN...Until 9 AM MST Saturday.

* IMPACTS...Plan on slippery road conditions and occasional
  difficult travel over mountain routes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

For winter road conditions from the Utah Department of
Transportation, visit
http://www.udottraffic.utah.gov/roadweatherforecast.aspx or dial
511.

&&

$$

UTZ016-130200-
/O.CON.KSLC.WW.Y.0011.210312T2300Z-210313T1600Z/
Southwest Utah-
Including the cities of Beaver, Cedar City, and Milford
1048 AM MST Fri Mar 12 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 4 PM THIS
AFTERNOON TO 9 AM MST SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 6 
  inches.

* WHERE...Southwest Utah.

* WHEN...From 4 PM this afternoon to 9 AM MST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Snowfall will be most likely to stick to
  area roads during the overnight and early morning hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

For winter road conditions from the Utah Department of
Transportation, visit
http://www.udottraffic.utah.gov/roadweatherforecast.aspx or dial
511.

&&

$$

UTZ009-130200-
/O.CON.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
Western Uinta Mountains-
Including the city of Mirror Lake Highway
1048 AM MST Fri Mar 12 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of 8 to 20
  inches possible. Winds could gust as high as 50 mph resulting 
  in areas of blowing snow.

* WHERE...Western Uinta Mountains, with the highest amounts on 
  the north slope.

* WHEN...From late Friday night through Sunday afternoon.

* IMPACTS...Backcountry travel and recreation could be impacted 
  by heavy snow and blowing snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

WYZ021-130200-
/O.CON.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
Southwest Wyoming-
Including the city of Evanston
1048 AM MST Fri Mar 12 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of up to 
  12 inches.

* WHERE...Uinta County, Wyoming. Heaviest snow across 
  southeastern portions of the county, south of I-80.

* WHEN...From late Friday night through Sunday afternoon.

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

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

For information on potential travel impacts visit...
http://udottraffic.utah.gov/roadweatherforecast.aspx
867 
WWUS45 KSLC 122109
WSWSLC

URGENT - WINTER WEATHER MESSAGE
National Weather Service Salt Lake City UT
209 PM MST Fri Mar 12 2021

UTZ009-131200-
/O.UPG.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
/O.NEW.KSLC.WS.W.0005.210313T1200Z-210315T0000Z/
Western Uinta Mountains-
Including the city of Mirror Lake Highway
209 PM MST Fri Mar 12 2021

...WINTER STORM WARNING IN EFFECT FROM 5 AM MST SATURDAY TO 6 PM
MDT SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 1 to 2
  feet, with locally higher amounts. Winds gusting as high as 50
  mph resulting in areas of blowing and drifting snow.

* WHERE...Western Uinta Mountains, with highest amounts on the 
  north slope, east of Mirror Lake Highway.

* WHEN...From 5 AM MST Saturday to 6 PM MDT Sunday.

* IMPACTS...Travel could be very difficult to impossible.
  Backcountry travel and recreation will be impacted by heavy 
  snow and blowing snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

For winter road conditions from the Utah Department of
Transportation, visit
http://www.udottraffic.utah.gov/roadweatherforecast.aspx or dial
511.

&&

$$

WYZ021-131200-
/O.UPG.KSLC.WS.A.0004.210313T1200Z-210315T0000Z/
/O.NEW.KSLC.WS.W.0005.210313T1200Z-210315T0000Z/
Southwest Wyoming-
Including the city of Evanston
209 PM MST Fri Mar 12 2021

...WINTER STORM WARNING IN EFFECT FROM 5 AM MST SATURDAY TO 6 PM
MDT SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 6 to 18
  inches, with only around 2 inches near Evanston. 

* WHERE...Uinta County Wyoming, mainly southeastern portions of 
  the county, with highest totals south of I-80 near the Utah 
  border.

* WHEN...From 5 AM MST Saturday to 6 PM MDT Sunday.

* IMPACTS...Travel could be very difficult to impossible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

For winter road conditions from the Wyoming Department of
Transportation, visit http://www.wyoroad.info or dial 511.

&&

$$

UTZ016-131200-
/O.CON.KSLC.WW.Y.0011.210312T2300Z-210313T1600Z/
Southwest Utah-
Including the cities of Beaver, Cedar City, and Milford
209 PM MST Fri Mar 12 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MST
SATURDAY...

* WHAT...Snow expected. Total snow accumulations ranging from
  around 2 inches near Cedar City to 7 inches near Milford.

* WHERE...Southwest Utah.

* WHEN...Until 9 AM MST Saturday.

* IMPACTS...Travel could be very difficult, with heaviest snow
  expected this evening through early Saturday morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

For winter road conditions from the Utah Department of
Transportation, visit
http://www.udottraffic.utah.gov/roadweatherforecast.aspx or dial
511.

&&

$$

UTZ518-131200-
/O.CON.KSLC.WW.Y.0011.000000T0000Z-210313T1600Z/
Southern Mountains-
Including the cities of Loa, Panguitch, and Bryce Canyon
209 PM MST Fri Mar 12 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MST
SATURDAY...

* WHAT...Snow. Additional snow accumulations of 2 to 7 inches.

* WHERE...Southern Mountains.

* WHEN...Until 9 AM MST Saturday.

* IMPACTS...Plan on slippery road conditions and occasional
  difficult travel over mountain routes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

For graphical depictions of the snowfall forecast, including
Official NWS Forecast, High End Amount, and Low End Amount, visit
weather.gov/slc/winter.

For winter road conditions from the Utah Department of
Transportation, visit
http://www.udottraffic.utah.gov/roadweatherforecast.aspx or dial
511.

&&

$$

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

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

What forecasters said that day

The local office's own words before this winter storm watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Salt Lake City, UT wrote its last area forecast discussion before this winter storm watch went out at Mar 11, 10:27 AM MST, 3 hours 41 minutes earlier.

Area forecast discussion, Mar 11, 10:27 AM MST, 3 hours 41 minutes before
Area Forecast Discussion
National Weather Service Salt Lake City UT
1027 AM MST Thu Mar 11 2021

.SYNOPSIS...
A cool and active weather pattern with mountain snow accumulations
is expected through the rest of the week as a large low pressure
system meanders from the Southwest through the Four Corners.

&&

.SHORT TERM (Through 12z Sunday)...
A broad closed low centered over central Cali continues to
separate from the mean northern branch flow this morning, with
translation only subtly to the south and east. The southern Utah
lobe of vorticity will continue to lift northeast to roughly the
I-80 corridor midday, prior to shearing and deforming for the
afternoon hours. This should once again focus the most widespread
snow shower activity later today, with additional accumulations
across portions of the Wasatch Back south into the Wasatch plateau
region as an aided upslope component in light southeasterly flow
will exist. Elsewhere across central/southern Utah, steep lapse
rates in place will aid fairly widespread diurnal snow shower
development with daytime heating, most widespread over and east of
the terrain. Areal extent of snow showers is expected to rapidly
diminish overnight tonight due to the loss of the convective
component, and a further tightening of the low about its center
just upstream of the area.

Have continued to roll with no headlines this morning due to a
somewhat periodic hit/miss accumulation periods through this
evening, but totals in many mtn locales from the central Wasatch
south should fall within the 5-10" range. Limited impacts to roads
with daylight, but do expect periods of slush over many mtn routes
during heavier convective bursts through sunrise and again this
afternoon/eve namely.

The upper low will continue a slow grind into the southern
Colorado Basin Friday pivoting an elongated trough axis
eastward... orientation from southwestern Utah northeast into the
Uintas. Tough to find any tangible lobes in guidance to point a
finger to, but bulk of guidance supports another uptick of diurnal
snow shower activity beneath and downstream of this axis across
namely central/eastern Utah. Heading into Saturday the core of low
will be transitioning from a positive tilt to a negative as it
grinds into the four corners region. With this, looking at the
north slope of the Uintas and the higher bench areas of Uinta
County, WY to be oriented beneath relatively broad forcing driven
by deep upglide within the wrap around environment. Deep layer
moisture coupled with favorable northeasterly upslope winds
coincident should aid modest snow accums across those areas, with
a potential advisory level event unfolding thereafter into Sunday
morning. Future shifts will be looking at this potential more
closely.

.LONG TERM (After 12Z Sunday)...
The cluster tool shows a consistent picture of the closed low
core over southeast Colorado by 00Z Monday but there are some
slight differences in the shape of the closed low with about 50%
of ensemble members showing a weak lobe of lower 500mb heights
stretching back into eastern Utah. Just enough threat to keep
mention of showers over the Uinta mountains into Sunday afternoon.

A temporary ridge will move over the region Monday providing
slightly above normal temps.

By 00Z Tuesday the GFS continues to be the model with the deepest
trough (93% of its members) moving into the Great Basin with about
50% of the EC and 30% of the Canadian members. Interestingly enough,
the other 7% of the GFS members show a ridge over the Great Basin
along with 16% of the EC and 25% of the Canadian. So although the
trough scenario is most likely there is enough disparity that the
NBM still shows a 14 degree spread between the 25th and 75th
percentile for the max temperature at SLC Tuesday between 44 and 58
degrees and between 40 and 54 degrees at Cedar City. The evolution
of the models over the past several runs is for a less dynamically
and thermally strong system moving in Monday night into Tuesday with
a faster transition to a ridge over the region by Wednesday. The GFS
and EC 48 hrs ago had -37C at 500mb over northern Utah by about 12Z
Tuesday, now the GFS is -26C over central Utah and the EC is -22C
over northern Utah. This all boils down to a less threat of any
significant precipitation and temperatures only slightly dipping
below normal Tuesday and Wednesday. There is a strong consensus that
a ridge will prevail by Thursday with above normal temperatures.

&&

.AVIATION...
VFR conditions are expected to continue across the KSLC terminal
through the valid TAF period. Vicinity showers near the terminal
will keep CIGs around 8kft AGL through the afternoon. There is a
40% chance these CIGs drop below 7kft AGL and create some mountain
obscuration issues through 00z. Winds will be predominately out
of the northwest and may become light and variable at times. winds
will shift to southerly flow after 06z and will remain light at
less than 8 knots.

&&

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

&&

SHORT TERM...Merrill/Church
LONG TERM...Struthwolf
AVIATION...Woodward

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, Mar 11, 8:10 AM MST, 5 hours 58 minutes before
Hazardous Weather Outlook
National Weather Service Salt Lake City UT
810 AM MST Thu Mar 11 2021

UTZ001>016-019>021-517-518-WYZ021-121515-
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-
810 AM MST Thu Mar 11 2021

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

.DAY ONE...Today and Tonight

Scattered to numerous snow showers will result in occasional
winter driving conditions over higher elevation mountain passes.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Snow showers will be possible again across primarily southern,
central, and eastern Utah and southwest Wyoming Friday into
Saturday, which will result in occasional winter driving
conditions over higher elevation mountain passes.

Heavy snow is possible on the northern slope of the Uinta
Mountains into southern Uinta County Wyoming Saturday into Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Please relay any information
about observed severe weather to the NWS while following all
local, state, and CDC guidelines.

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

In the hours before

Local storm report, Mar 11, 9:51 AM MST, 4 hours 17 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
951 AM MST THU MAR 11 2021

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

0456 AM     SNOW             ALTA                    40.58N 111.64W
03/11/2021  M2.5 INCH        SALT LAKE          UT   TRAINED SPOTTER

            ALTA COLLINS - 9662 FT

0503 AM     SNOW             BRIGHTON                40.62N 111.59W
03/11/2021  M2.5 INCH        SALT LAKE          UT   TRAINED SPOTTER

            SOLITUDE - 8200 FT

0531 AM     SNOW             LOGAN                   41.90N 111.63W
03/11/2021  M4.0 INCH        CACHE              UT   TRAINED SPOTTER

            LOGAN MOUNTAINS - 8400 FT

0545 AM     SNOW             ALTA                    40.59N 111.64W
03/11/2021  M1.0 INCH        SALT LAKE          UT   TRAINED SPOTTER

            ALTA UDOT - 8799 FT

0548 AM     SNOW             ALTA                    40.57N 111.65W
03/11/2021  M1.0 INCH        SALT LAKE          UT   TRAINED SPOTTER

            SNOWBIRD - 8100 FT

0619 AM     SNOW             PARK CITY               40.61N 111.54W
03/11/2021  M4.0 INCH        SUMMIT             UT   TRAINED SPOTTER

            PARK CITY MOUNTAIN - 9300 FT

0640 AM     SNOW             SPRINGDELL              40.33N 111.63W
03/11/2021  M2.0 INCH        UTAH               UT   TRAINED SPOTTER

            PROVO CANYON - 6100 FT

0643 AM     SNOW             PARK CITY               40.66N 111.57W
03/11/2021  M3.0 INCH        SUMMIT             UT   TRAINED SPOTTER

            CANYONS VILLAGE AT PARK CITY - 8800 FT

0700 AM     SNOW             PANGUITCH               37.82N 112.44W
03/11/2021  M2.0 INCH                                COOP OBSERVER

0700 AM     SNOW             BOULDER                 37.95N 111.43W
03/11/2021  M1.4 INCH                                TRAINED SPOTTER

0700 AM     SNOW             CEDAR CITY              37.68N 113.07W
03/11/2021  M3.6 INCH        IRON               UT   COOP OBSERVER

0700 AM     SNOW             PANGUITCH               37.91N 112.39W
03/11/2021  M1.7 INCH                                TRAINED SPOTTER

0700 AM     SNOW             PANGUITCH               37.85N 112.40W
03/11/2021  M1.2 INCH                                TRAINED SPOTTER

0700 AM     SNOW             NEWCASTLE               37.66N 113.55W
03/11/2021  M0.2 INCH        IRON               UT   TRAINED SPOTTER

0700 AM     SNOW             CEDAR CITY              37.75N 113.14W
03/11/2021  M2.0 INCH        IRON               UT   TRAINED SPOTTER

0700 AM     SNOW             BEAVER                  38.28N 112.62W
03/11/2021  M1.6 INCH        BEAVER             UT   TRAINED SPOTTER

0700 AM     SNOW             BEAVER                  38.28N 112.65W
03/11/2021  M1.8 INCH        BEAVER             UT   TRAINED SPOTTER

0718 AM     SNOW             SNOWBASIN               41.20N 111.86W
03/11/2021  M1.0 INCH        WEBER              UT   MESONET

            SNOWBASIN-MID. BOWL - 7402 FT

0730 AM     SNOW             BRIGHTON                40.64N 111.64W
03/11/2021  M2.0 INCH        SALT LAKE          UT   TRAINED SPOTTER

            BIG COTTONWOOD SPRUCES - 7402 FT

0730 AM     SNOW             OAKLEY                  40.71N 111.30W
03/11/2021  M2.3 INCH        SUMMIT             UT   TRAINED SPOTTER

0800 AM     SNOW             PARK CITY               40.68N 111.50W
03/11/2021  M3.1 INCH        SUMMIT             UT   TRAINED SPOTTER

0800 AM     SNOW             EDEN                    41.30N 111.81W
03/11/2021  M0.2 INCH        WEBER              UT   TRAINED SPOTTER

0800 AM     SNOW             HEBER CITY              40.50N 111.40W
03/11/2021  M3.0 INCH        WASATCH            UT   TRAINED SPOTTER

0800 AM     SNOW             CALLAO                  39.89N 113.71W
03/11/2021  M1.2 INCH        JUAB               UT   COOP OBSERVER

0800 AM     SNOW             RICHFIELD               38.58N 112.33W
03/11/2021  M1.0 INCH        SEVIER             UT   COOP OBSERVER

0800 AM     SNOW             HANKSVILLE              38.26N 110.18W
03/11/2021  M0.7 INCH        WAYNE              UT   COOP OBSERVER

0800 AM     SNOW             NEW HARMONY             37.48N 113.31W
03/11/2021  M3.6 INCH        WASHINGTON         UT   COOP OBSERVER

0800 AM     SNOW             HEBER CITY              40.40N 111.53W
03/11/2021  M1.0 INCH        WASATCH            UT   COOP OBSERVER

0800 AM     SNOW             ROSETTE                 41.82N 113.41W
03/11/2021  M1.5 INCH        BOX ELDER          UT   COOP OBSERVER

0828 AM     SNOW             KANAB                   37.04N 112.52W
03/11/2021  M2.5 INCH        KANE               UT   COOP OBSERVER

0900 AM     SNOW             HEBER CITY              40.47N 111.40W
03/11/2021  M3.0 INCH        WASATCH            UT   TRAINED SPOTTER

0949 AM     SNOW             CEDAR CITY              37.68N 113.09W
03/11/2021  M4.5 INCH        IRON               UT   TRAINED SPOTTER

&&

WILSON/CHURCH

Nearby

Winter Storm Watches in Wyoming, 2021Winter Storm Watches in Utah, 2021Every winter storm watch in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.