Alert archive / Colorado / Red Flag Warnings in 2018

Red Flag Warning 19, NWS Grand Junction, CO

June 18, 20186 counties in Colorado; Grand County, Uintah County, Utah

NWS Grand Junction, CO issued this red flag warning at Jun 18, 2018, 2:10 AM MDT for 6 counties in Colorado; Grand County, Uintah County, Utah. It took effect at Jun 18, 2018, 11:00 AM MDT. It was in force for 9 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
Jun 18, 2018, 2:10 AM MDT (08:10 UTC)
In effect from
Jun 18, 2018, 11:00 AM MDT
Expired
Jun 18, 2018, 8:00 PM MDT
In force
9 hr
Issued by
NWS Grand Junction, CO

Counties Garfield County, CO, Mesa County, CO, Moffat County, CO, Montrose County, CO, Rio Blanco County, CO, San Miguel County, CO, Grand County, UT, Uintah County, UT

The radar

The Grand Junction radar (KGJX), 44 km from the middle of the area, began a volume at 08:10 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 24 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 00:00Z on 2018-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 325 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2018-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
325 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
2346 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 Jun 17, 4:56 PM MDT, 9 hours 14 minutes earlier.

Area forecast discussion, Jun 17, 4:56 PM MDT, 9 hours 14 minutes before
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Hazardous weather outlook, Jun 17, 2:28 AM MDT, 23 hours 42 minutes before
Hazardous Weather Outlook
National Weather Service Grand Junction CO
228 AM MDT Sun Jun 17 2018

COZ001>014-017>023-UTZ022>025-027>029-181100-
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-
228 AM MDT Sun Jun 17 2018

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

.DAY ONE...Today and Tonight

Deep moisture remains in place today with scattered showers
continuing through the morning hours. Thunderstorms will continue
over southwest Colorado and track towards the 416 Fire this
morning, causing concerns for flash flooding. Flash flooding
concerns lessen by late morning into the afternoon, but locally
heavy rainfall will remain possible as storms redevelop across
much of the area this afternoon. Drier air moves in from the
west and southwest late afternoon into the evening, pushing shower
activity towards the northeast and out of the region by midnight.
Temperatures will be much cooler today due to increased clouds and
showers.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Dry conditions remain Monday through mid-week with afternoon
storms possible late next week, favoring the higher terrain.
Temperatures will make a return towards normal next week as
conditions dry out.

.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.

Nearby

Red Flag Warnings in Colorado, 2018Red Flag Warnings in Utah, 2018Every red flag 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.