Alert archive / Utah / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 10, NWS Grand Junction, CO

August 3, 2018Grand County, Utah

NWS Grand Junction, CO issued this severe thunderstorm warning at Aug 3, 2018, 5:11 PM MDT for Grand County, Utah. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 3, 2018, 5:11 PM MDT (23:11 UTC)
Expired
Aug 3, 2018, 5:45 PM MDT
In force
34 min
Issued by
NWS Grand Junction, CO
Area
Storm-based polygon
Hail
1.0 in
Wind
70.0 mph

County Grand County, UT

The radar

The Grand Junction radar (KGJX), 118 km from the middle of the area, began a volume at 23:11 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.

What forecasters said that day

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

NWS Grand Junction, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 3, 3:44 PM MDT, 1 hour 27 minutes earlier.

Area forecast discussion, Aug 3, 3:44 PM MDT, 1 hour 27 minutes before
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Hazardous weather outlook, Aug 3, 3:55 AM MDT, 13 hours 16 minutes before
Hazardous Weather Outlook
National Weather Service Grand Junction CO
355 AM MDT Fri Aug 3 2018

COZ001>014-017>023-UTZ022>025-027>029-041000-
Lower Yampa River Basin-Central Yampa River Basin-
Roan and Tavaputs Plateaus-Elkhead and Park Mountains-
Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor-
Central Colorado River Basin-Grand and Battlement Mesas-
Gore and Elk Mountains/Central Mountain Valleys-
Central Gunnison and Uncompahgre River Basin-
West Elk and Sawatch Mountains-Flat Tops-
Upper Gunnison River Valley-Uncompahgre Plateau and Dallas Divide-
Northwest San Juan Mountains-Southwest San Juan Mountains-
Paradox Valley/Lower Dolores River-
Four Corners/Upper Dolores River-Animas River Basin-
San Juan River Basin-Southeast Utah-Eastern Uinta Mountains-
Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat-
La Sal and Abajo Mountains-Canyonlands/Natural Bridges-
355 AM MDT Fri Aug 3 2018

This hazardous weather outlook is for eastern Utah and western
Colorado.

.DAY ONE...Today and Tonight

Showers and thunderstorms are expected to develop throughout the
day today. Later in the evening, a few storms may be capable of
stronger wind gusts as well as small hail along and north of I-70.
This activity will move west to east and end shortly after sunset.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Showers and thunderstorms will be confined mostly to the higher
terrain along the Divide from this weekend into early next week.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report any strong wind, hail, or
reductions in visibility to the National Weather Service today.

In the hours before

Special weather statement, Aug 3, 2:58 PM MDT, 2 hours 13 minutes before
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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Special weather statement, Aug 3, 3:17 PM MDT, 1 hour 54 minutes before
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Special weather statement, Aug 3, 4:22 PM MDT, 49 minutes before
Special Weather Statement
National Weather Service Grand Junction CO
422 PM MDT FRI AUG 3 2018

COZ006-UTZ025-027-032300-
Grand Valley CO-Arches/Grand Flat UT-Tavaputs Plateau UT-
422 PM MDT FRI AUG 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN GRAND COUNTY UNTIL
500 PM MDT...

At 421 PM MDT, Doppler radar was tracking a strong thunderstorm 41
miles northeast of Green River, moving southeast at 30 mph.

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

This storm will remain over mainly rural areas of northeastern Grand
County.

This includes Interstate 70 in Utah between mile markers 215 and 227.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3934 10967 3944 10959 3933 10905 3899 10922
TIME...MOT...LOC 2221Z 303DEG 28KT 3936 10955

Stearns
Special weather statement, Aug 3, 5:09 PM MDT, 2 minutes before
Special Weather Statement
National Weather Service Grand Junction CO
509 PM MDT FRI AUG 3 2018

COZ002-013-032345-
Flattops CO-Central Yampa River Basin CO-
509 PM MDT FRI AUG 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL ROUTT AND
SOUTHEASTERN MOFFAT COUNTIES UNTIL 545 PM MDT...

At 507 PM MDT, Doppler radar was tracking a strong thunderstorm near
Craig, moving southeast at 20 mph.

Frequent cloud to ground lightning, dime size hail and winds in
excess of 40 mph will be possible with this storm.

Locations impacted include...
Craig, Hayden and Hamilton.

This includes the following highways...U.S. Highway 40 in Colorado
between mile markers 80 and 96, near mile marker 98, and between
mile markers 100 and 105. Colorado 13 between mile markers 75 and 93.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4044 10781 4060 10771 4048 10724 4024 10739
TIME...MOT...LOC 2307Z 294DEG 16KT 4049 10767

JDC

The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 3, 2:58 PM MDTSpecial Weather StatementGJTMoffat47 min
Aug 3, 3:17 PM MDTSpecial Weather StatementGJT43 min
Aug 3, 5:09 PM MDTSpecial Weather StatementGJTRoutt36 min
Aug 3, 5:45 PM MDTSpecial Weather StatementGJT30 min
Aug 3, 5:46 PM MDTSpecial Weather StatementGJTMesa44 min
Aug 3, 5:47 PM MDTSpecial Weather StatementGJTRoutt28 min
Aug 3, 4:22 PM MDTSpecial Weather StatementGJTGrand38 min
Aug 3, 4:45 PM MDTSevere Thunderstorm WarningGJTGrand30 min

Nearby

Severe Thunderstorm Warnings in Utah, 2018Every severe thunderstorm warning in 2018

Sources

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