Alert archive / Colorado / Special Weather Statements in 2021

Special Weather Statement, NWS Grand Junction, CO

August 6, 2021Routt County, Colorado

NWS Grand Junction, CO issued this special weather statement at Aug 6, 2021, 1:28 PM MDT for Routt County, Colorado. It was in force for 32 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: Aug 6, 2021, 1:28 PM MDT (19:28 UTC)
Expired: Aug 6, 2021, 2:00 PM MDT
In force: 32 min
Issued by: NWS Grand Junction, CO
Hail: 0.50 in
Wind: 50

County Routt County, CO

The radar

The Cheyenne radar (KCYS), 171 km from the middle of the area, began a volume at 19:31 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 12:00Z, 7.5 hours before the alert went out and 237 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: 1 J/kg
Mixed-layer CIN: -466 J/kg
Mixed-layer LCL: 3226 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 261 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 Aug 6, 11:34 AM MDT, 1 hour 54 minutes earlier.

Area forecast discussion, Aug 6, 11:34 AM MDT, 1 hour 54 minutes before

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Hazardous weather outlook, Aug 6, 4:53 AM MDT, 8 hours 35 minutes before

Hazardous Weather Outlook
National Weather Service Grand Junction CO
453 AM MDT Fri Aug 6 2021

COZ001>014-017>023-UTZ022>025-027>029-071100-
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 Aug 6 2021

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

.DAY ONE...Today and Tonight

Hot and dry conditions combine with strong southwest winds today
leading to critical fire weather conditions across northwest and
west-central Colorado and east-central Utah. A Red Flag Warning
remains in effect for those areas from noon to 8 PM this evening.
In addition, scattered showers and thunderstorms will develop
this afternoon, though mainly over the mountains. Relatively fast
moving, high based storms are unlikely to generate heavy rain, so
the flash flood and mud/debris slide potential is low.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

 Precipitation chances remain low this weekend through the middle
of next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

In the hours before

Local storm report, Aug 6, 12:04 PM MDT, 1 hour 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1204 PM MDT FRI AUG 6 2021

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

1134 AM     NON-TSTM WND GST DOUGLAS PASS            39.60N 108.81W
08/06/2021  M45 MPH          GARFIELD           CO   MESONET

            MESONET STATION CO098 139S034 DOUGLAS PASS.

&&

LTB

Local storm report, Aug 6, 1:02 PM MDT, 26 minutes before

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Local storm report, Aug 6, 1:18 PM MDT, 10 minutes before

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Special weather statement, Aug 6, 1:28 PM 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
Aug 6, 3:33 PM MDT	Special Weather Statement	GJT	Garfield	27 min
Aug 6, 3:56 PM MDT	Special Weather Statement	GJT	Routt	49 min
Aug 6, 4:49 PM MDT	Special Weather Statement	GJT	Routt	26 min
Aug 6, 5:16 PM MDT	Special Weather Statement	GJT	Routt	29 min

Nearby

Special Weather Statements in Colorado, 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.