Alert archive / Colorado / Special Weather Statements in 2021

Special Weather Statement, NWS Grand Junction, CO

July 24, 2021Montezuma County, Colorado

NWS Grand Junction, CO issued this special weather statement at Jul 24, 2021, 2:15 PM MDT for Montezuma County, Colorado. It was in force for 30 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 24, 2021, 2:15 PM MDT (20:15 UTC)
Expired
Jul 24, 2021, 2:45 PM MDT
In force
30 min
Issued by
NWS Grand Junction, CO

County Montezuma County, CO

The radar

The Grand Junction radar (KGJX), 223 km from the middle of the area, began a volume at 20:16 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, 8.3 hours before the alert went out and 228 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, Grand Junction, CO at 12:00Z on 2021-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 19 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 12:00Z on 2021-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939Sfc1 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
19 J/kg
Mixed-layer CIN
-266 J/kg
Mixed-layer LCL
1844 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
94 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 24, 12:54 PM MDT, 1 hour 21 minutes earlier.

Area forecast discussion, Jul 24, 12:54 PM MDT, 1 hour 21 minutes before
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Hazardous weather outlook, Jul 24, 5:49 AM MDT, 8 hours 26 minutes before
Hazardous Weather Outlook
National Weather Service Grand Junction CO
549 AM MDT Sat Jul 24 2021

COZ001>014-017>023-UTZ022>025-027>029-251200-
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-
549 AM MDT Sat Jul 24 2021

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

.DAY ONE...Today and Tonight

Thunderstorm development will occur again by mid-day over the
mountains with storms moving southwest into the adjacent valleys
of the southern Colorado and Utah. Gusty winds...small hail and
heavy rainfall will be threats with storms in the south today.
With monsoonal moisture in place...localized flooding is also a
concern with some storms and a Flash Flood Watch is in effect for
southern portions of Utah and Colorado. Storms this evening will
stratify out and linger through the early morning hours as light
showers.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Daily scattered to numerous showers and thunderstorms can be
expected from Sunday onward. Moderate to heavy rain and gusty
winds will be the primary threats with storms along with
lightning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected today or tonight, however
spotters are encouraged to relay rainfall amounts or any observed
flooding to the National Weather Service in Grand Junction.

In the hours before

Special weather statement, Jul 24, 1:30 PM MDT, 45 minutes before
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Special weather statement, Jul 24, 1:30 PM MDT, 45 minutes before
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Local storm report, Jul 24, 1:31 PM MDT, 44 minutes before
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Special weather statement, Jul 24, 1:32 PM MDT, 43 minutes before
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Local storm report, Jul 24, 1:39 PM MDT, 36 minutes before
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Special weather statement, Jul 24, 2:15 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.

IssuedProductOfficeCountiesLasted
Jul 23, 6:04 PM MDTAreal Flood AdvisoryGJTRio Blanco116 min
Jul 23, 6:11 PM MDTAreal Flood AdvisoryGJTDelta2 hr
Jul 23, 6:17 PM MDTSpecial Weather StatementGJTDelta28 min
Jul 23, 6:37 PM MDTSpecial Weather StatementGJT38 min
Jul 23, 7:04 PM MDTAreal Flood AdvisoryGJTMesa, Montrose109 min
Jul 23, 7:14 PM MDTAreal Flood AdvisoryGJTGarfield, Mesa3 hr
Jul 23, 8:44 PM MDTAreal Flood AdvisoryGJTDolores, San Miguel2 hr
Jul 24, 3:51 AM MDTFlash Flood WatchGJTArchuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more17 hr
Jul 24, 11:57 AM MDTSpecial Weather StatementGJTGarfield48 min
Jul 24, 12:34 PM MDTAreal Flood AdvisoryGJTDelta, Gunnison, Mesa, Pitkin3 hr
Jul 24, 12:41 PM MDTSpecial Weather StatementGJTDelta49 min
Jul 24, 1:30 PM MDTSpecial Weather StatementGJTDelta30 min
Jul 24, 1:30 PM MDTSpecial Weather StatementGJTGarfield45 min
Jul 24, 1:32 PM MDTSpecial Weather StatementGJTOuray28 min
Jul 24, 1:36 PM MDTAreal Flood AdvisoryGJTGarfield, Mesa13 min
Jul 24, 1:46 PM MDTAreal Flood AdvisoryGJTSan Miguel3 hr
Jul 24, 1:49 PM MDTFlash Flood WarningGJTGarfield, Mesa3 hr
Jul 24, 2:09 PM MDTAreal Flood AdvisoryGJTSan Miguel55 min
Jul 24, 2:34 PM MDTAreal Flood AdvisoryGJTMontrose, San Miguel30 min
Jul 24, 2:45 PM MDTSpecial Weather StatementGJTMontezuma15 min
Jul 24, 3:03 PM MDTFlash Flood WarningGJTMontrose, San Miguel3 hr
Jul 24, 3:12 PM MDTFlash Flood Warning Considerable damage threatGJTGarfield, Mesa82 min
Jul 24, 3:27 PM MDTAreal Flood AdvisoryGJTMontezuma2 hr
Jul 24, 3:28 PM MDTFlash Flood Warning Considerable damage threatGJTEagle, Garfield69 min
Jul 24, 3:45 PM MDTAreal Flood AdvisoryGJTMontrose4 min
Jul 24, 3:47 PM MDTFlash Flood WarningGJTMontrose3 hr
Jul 24, 3:55 PM MDTFlash Flood WarningGJTMesa, Montrose3 hr
Jul 23, 7:24 PM MDTAreal Flood AdvisoryGJTGrand, San Juan3 hr
Jul 24, 1:26 PM MDTAreal Flood AdvisoryGJTSan Juan3 hr
Jul 24, 3:35 PM MDTFlash Flood WarningGJTSan Juan3 hr
Jul 24, 3:42 PM MDTFlash Flood WarningGJTSan Juan2 hr

Nearby

Special Weather Statements in Colorado, 2021Every 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.