Alert archive / Colorado / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 2, NWS Grand Junction, CO

June 18, 2019Garfield County, Mesa County, Colorado

NWS Grand Junction, CO issued this severe thunderstorm warning at Jun 18, 2019, 5:52 PM MDT for Garfield County, Mesa County, Colorado. It was in force for 23 min. 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, 2019, 5:52 PM MDT (23:52 UTC)
Expired: Jun 18, 2019, 6:15 PM MDT
In force: 23 min
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Garfield County, CO, Mesa County, CO

The radar

The Grand Junction radar (KGJX), 27 km from the middle of the area, began a volume at 23:55 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

Riverton, WY (KRIW), launched 12:00Z, 11.9 hours before the alert went out and 419 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: 24 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 1178 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 59 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 severe thunderstorm 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 severe thunderstorm warning went out at Jun 18, 5:43 PM MDT, 9 minutes earlier.

Area forecast discussion, Jun 18, 5:43 PM MDT, 9 minutes before

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Hazardous weather outlook, Jun 18, 4:55 AM MDT, 12 hours 57 minutes before

Hazardous Weather Outlook
National Weather Service Grand Junction CO
455 AM MDT Tue Jun 18 2019

COZ001>014-017>023-UTZ022>025-027>029-191200-
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-
455 AM MDT Tue Jun 18 2019

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

.DAY ONE...Today and Tonight

Another day of showers and thunderstorms is expected this
afternoon and evening. Main concerns will be heavy rain, small
hail, and some gusty outflow winds. Most convection will die down
shortly after sunset.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Some gusty winds will increase fire weather concerns on Thursday
for southeastern Utah and southwestern Colorado. Showers and
storms return Friday and Saturday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

In the hours before

Special weather statement, Jun 18, 3:49 PM MDT, 2 hours 3 minutes before

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Special weather statement, Jun 18, 3:52 PM MDT, 2 hours before

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Special weather statement, Jun 18, 4:18 PM MDT, 1 hour 34 minutes before

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Local storm report, Jun 18, 4:29 PM MDT, 1 hour 23 minutes before

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Local storm report, Jun 18, 4:30 PM MDT, 1 hour 22 minutes before

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Special weather statement, Jun 18, 5:23 PM MDT, 29 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
Jun 17, 6:15 PM MDT	Special Weather Statement	GJT	Mesa	30 min
Jun 17, 6:33 PM MDT	Special Weather Statement	GJT	Mesa	27 min
Jun 17, 6:49 PM MDT	Areal Flood Advisory	GJT	Mesa	47 min
Jun 18, 1:32 PM MDT	Special Weather Statement	GJT	San Miguel	28 min
Jun 18, 2:05 PM MDT	Special Weather Statement	GJT	Moffat	40 min
Jun 18, 2:37 PM MDT	Fire Weather Watch	GJT	Delta, Dolores, Garfield, La Plata, Mesa, Montezuma and 3 more	24 hr
Jun 18, 2:45 PM MDT	Special Weather Statement	GJT	Moffat	30 min
Jun 18, 2:48 PM MDT	Special Weather Statement	GJT	Rio Blanco	27 min
Jun 18, 3:49 PM MDT	Special Weather Statement	GJT	Rio Blanco	26 min
Jun 18, 3:52 PM MDT	Special Weather Statement	GJT		23 min
Jun 18, 4:18 PM MDT	Special Weather Statement	GJT	Garfield	27 min
Jun 18, 5:23 PM MDT	Special Weather Statement	GJT	Garfield	37 min
Jun 18, 5:55 PM MDT	Special Weather Statement	GJT	Montrose	50 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2019 Every severe thunderstorm warning in 2019

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.