Alert archive / Colorado / Red Flag Warnings in 2020

Red Flag Warning 38, NWS Grand Junction, CO

July 11, 202011 counties in Colorado; 4 counties in Utah

NWS Grand Junction, CO issued this red flag warning at Jul 11, 2020, 2:12 PM MDT for 11 counties in Colorado; 4 counties in Utah. It took effect at Jul 13, 2020, 10:00 AM MDT. It was in force for 11 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 11, 2020, 2:12 PM MDT (20:12 UTC)
In effect from
Jul 13, 2020, 10:00 AM MDT
Expired
Jul 13, 2020, 9:00 PM MDT
In force
11 hr
Issued by
NWS Grand Junction, CO

Counties Delta County, CO, Dolores County, CO, Garfield County, CO, La Plata County, CO, Mesa County, CO, Moffat County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, Rio Blanco County, CO, San Miguel County, CO, Daggett County, UT, Grand County, UT, San Juan County, UT, Uintah County, UT

The radar

The Grand Junction radar (KGJX), 39 km from the middle of the area, began a volume at 20:11 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.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 8.2 hours before the alert went out and 357 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 2020-07-11Temperature 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 km15 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 2020-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 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
3768 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this red flag 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 red flag warning went out at Jul 11, 11:23 AM MDT, 2 hours 49 minutes earlier.

Area forecast discussion, Jul 11, 11:23 AM MDT, 2 hours 49 minutes before
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Hazardous weather outlook, Jul 11, 4:08 AM MDT, 10 hours 4 minutes before
Hazardous Weather Outlook
National Weather Service Grand Junction CO
408 AM MDT Sat Jul 11 2020

COZ001>014-017>023-UTZ023>025-028-121015-
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-Eastern Uinta Mountains-Eastern Uinta Basin-
Tavaputs Plateau-La Sal and Abajo Mountains-
408 AM MDT Sat Jul 11 2020

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

.DAY ONE...Today and Tonight

No hazardous weather is expected at this time. Winds this
afternoon will continue to be less gusty than previous days,
therefore reducing the threat of fire weather.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time. Very hot weather
will be the story on Sunday due to a large area of high pressure
anchored over the southern Four Corners. Highs in the lower
valleys will exceed 100 degrees, with cooler yet still
unseasonably warm temperatures found in the higher terrain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

UTZ022-027-029-121015-
Southeast Utah-Arches/Grand Flat-Canyonlands/Natural Bridges-
408 AM MDT Sat Jul 11 2020

This hazardous weather outlook is for portions of east central
Utah and southeast Utah.

.DAY ONE...Today and Tonight

A strong area of high pressure will result in continued hot and
dry weather today. The lower valleys in these areas will see
dangerously hot conditions with temperatures as high as 105 to 110
expected below 5000 feet. Hot temperatures will significantly
increase the potential for heat related illnesses, particularly
for those working or participating in outdoor activities.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Hot weather continues on Sunday. The lower valleys in these areas
will see dangerously hot conditions with temperatures as high as
105 to 110 expected below 5000 feet. Hot temperatures will
significantly increase the potential for heat related illnesses,
particularly for those working or participating in outdoor
activities.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 3:19 AM MDTFire Weather WatchGJTDelta, Dolores, Garfield, La Plata, Mesa, Moffat and 5 more11 hr

Nearby

Red Flag Warnings in Colorado, 2020Red Flag Warnings in Utah, 2020Every red flag warning in 2020

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.