Alert archive / Utah / Special Weather Statements in 2021

Special Weather Statement, NWS Grand Junction, CO

July 31, 2021Uintah County, Utah

NWS Grand Junction, CO issued this special weather statement at Jul 31, 2021, 2:13 AM MDT for Uintah County, Utah. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 31, 2021, 2:13 AM MDT (08:13 UTC)
Expired: Jul 31, 2021, 3:00 AM MDT
In force: 47 min
Issued by: NWS Grand Junction, CO

County Uintah County, UT

The radar

The Grand Junction radar (KGJX), 153 km from the middle of the area, began a volume at 08:14 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

Grand Junction, CO (KGJT), launched 00:00Z, 8.2 hours before the alert went out and 133 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 153 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 2676 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 31, 1:03 AM MDT, 1 hour 10 minutes earlier.

Area forecast discussion, Jul 31, 1:03 AM MDT, 1 hour 10 minutes before

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Hazardous weather outlook, Jul 30, 4:53 AM MDT, 21 hours 20 minutes before

Hazardous Weather Outlook
National Weather Service Grand Junction CO
453 AM MDT Fri Jul 30 2021

COZ001>014-017>023-UTZ022>025-027>029-311100-
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-
453 AM MDT Fri Jul 30 2021

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

.DAY ONE...Today and Tonight

Another round of widespread showers and thunderstorms expected
today with the focus shifting more over western Colorado for the
best potential for heavy rain and flash flooding. Monsoon moisture
will remain entrenched over the region with storm activity
continuing into the overnight hours. Expect heavy rain, frequent
lightning, gusty outflow winds to 40 kts and small hail with
stronger storms.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Daily widespread to numerous showers and thunderstorms can be
expected each day through early next week, with monsoon moisture
entrenched across the area. Moderate to heavy rain, gusty winds
and lightning will be the primary threats with storms. A downturn
is possible mid to late next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

In the hours before

Special weather statement, Jul 30, 9:28 PM MDT, 4 hours 45 minutes before

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Local storm report, Jul 30, 9:36 PM MDT, 4 hours 37 minutes before

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Special weather statement, Jul 31, 12:15 AM MDT, 1 hour 58 minutes before

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Special weather statement, Jul 31, 12:40 AM MDT, 1 hour 33 minutes before

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Special weather statement, Jul 31, 12:59 AM MDT, 1 hour 14 minutes before

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Special weather statement, Jul 31, 2:13 AM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 6:23 PM MDT	Flash Flood Warning	GJT	Pitkin	112 min
Jul 30, 6:29 PM MDT	Special Weather Statement	GJT	Pitkin	31 min
Jul 30, 7:26 PM MDT	Special Weather Statement	GJT		34 min
Jul 30, 7:37 PM MDT	Severe Thunderstorm Warning	GJT	Mesa	23 min
Jul 30, 7:46 PM MDT	Areal Flood Advisory	GJT	Garfield	119 min
Jul 30, 7:52 PM MDT	Areal Flood Advisory	GJT	Garfield	113 min
Jul 30, 7:55 PM MDT	Areal Flood Advisory	GJT	Mesa, Montrose	3 hr
Jul 30, 8:00 PM MDT	Severe Thunderstorm Warning	GJT	Mesa	30 min
Jul 30, 9:04 PM MDT	Special Weather Statement	GJT	Mesa	26 min
Jul 30, 9:28 PM MDT	Special Weather Statement	GJT	Mesa	32 min
Jul 30, 10:44 PM MDT	Areal Flood Advisory	GJT	Mesa	2 hr
Jul 30, 11:14 PM MDT	Areal Flood Advisory	GJT	Mesa	3 hr
Jul 31, 12:13 AM MDT	Areal Flood Advisory	GJT	Mesa	3 hr
Jul 31, 12:30 AM MDT	Areal Flood Advisory	GJT	Moffat, Rio Blanco	3 hr
Jul 31, 1:08 PM MDT	Special Weather Statement	GJT		22 min
Jul 31, 2:45 PM MDT	Flash Flood Warning	GJT	San Miguel	2 hr
Jul 31, 3:00 PM MDT	Special Weather Statement	GJT	San Miguel	30 min
Jul 31, 3:50 PM MDT	Flash Flood Warning Considerable damage threat	GJT	Eagle, Garfield	115 min
Jul 31, 4:16 PM MDT	Flash Flood Warning Considerable damage threat	GJT	Garfield, Mesa	104 min
Jul 31, 4:32 PM MDT	Areal Flood Advisory	GJT	Dolores, Montezuma	118 min
Jul 31, 5:48 PM MDT	Flash Flood Warning	GJT	Pitkin	117 min
Jul 31, 5:52 PM MDT	Areal Flood Advisory	GJT	Rio Blanco	3 hr
Jul 31, 12:15 AM MDT	Special Weather Statement	GJT	Uintah	45 min
Jul 31, 12:40 AM MDT	Special Weather Statement	GJT	Uintah	50 min
Jul 31, 12:59 AM MDT	Special Weather Statement	GJT	Daggett	31 min
Jul 31, 12:48 PM MDT	Areal Flood Advisory	GJT	San Juan	3 hr
Jul 31, 4:58 PM MDT	Areal Flood Advisory	GJT	San Juan	2 hr

Nearby

Special Weather Statements in Utah, 2021 Every special weather statement 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.