Alert archive / Colorado / Flash Flood Watches in 2021
Flash Flood Watch 10, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood watch at Jul 8, 2021, 4:04 PM MDT for 6 counties in Colorado. It was in force for 111 min.
The area
The counties it named.
The facts
- Issued
- Jul 8, 2021, 4:04 PM MDT (22:04 UTC)
- Expired
- Jul 8, 2021, 5:55 PM MDT
- In force
- 111 min
- Issued by
- NWS Grand Junction, CO
- Flood severity
- None
Counties Eagle County, CO, Garfield County, CO, Moffat County, CO, Pitkin County, CO, Rio Blanco County, CO, Routt County, CO
The radar
The Grand Junction radar (KGJX), 114 km from the middle of the area, began a volume at 22:03 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, 10.1 hours before the alert went out and 124 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3719 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at Jul 8, 3:00 PM MDT, 1 hour 4 minutes earlier.
Area forecast discussion, Jul 8, 3:00 PM MDT, 1 hour 4 minutes before
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</html>Hazardous weather outlook, Jul 8, 3:18 AM MDT, 12 hours 46 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 318 AM MDT Thu Jul 8 2021 COZ001>014-017>023-UTZ022>025-027>029-090930- 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- 318 AM MDT Thu Jul 8 2021 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Hot weather is expected again, with triple digit heat for the lower desert valleys. Critical fire weather is possible across portions of northwest Colorado and northeast Utah this afternoon. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Hot temperatures continue through Friday reaching triple digits for the lower valleys. Critical fire weather is possible across portions of northwest Colorado and northeast Utah on Friday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
In the hours before
Special weather statement, Jul 8, 3:41 PM MDT, 23 minutes before
Special Weather Statement National Weather Service Grand Junction CO 341 PM MDT Thu Jul 8 2021 COZ019-022-082215- Animas River Basin CO-Southwest San Juan Mountains CO- 341 PM MDT Thu Jul 8 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LA PLATA COUNTY UNTIL 415 PM MDT... At 341 PM MDT, Doppler radar was tracking a strong thunderstorm over Bayfield, or 17 miles east of Durango, moving southeast at 30 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Bayfield and Ignacio. This includes the following highways... U.S. Highway 160 in Colorado between mile markers 96 and 111. Colorado 151 between mile markers 1 and 8. Colorado 172 near mile marker 6, and between mile markers 8 and 14. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 3725 10773 3730 10749 3706 10749 3706 10761 TIME...MOT...LOC 2141Z 313DEG 27KT 3724 10757 15
The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 3:06 AM MDT | Red Flag Warning | GJT | Moffat, Rio Blanco | 41 hr |
| Jul 8, 1:32 PM MDT | Fire Weather Watch | GJT | Dolores, La Plata, Montezuma, San Miguel | 24 hr |
| Jul 8, 3:41 PM MDT | Special Weather Statement | GJT | La Plata | 34 min |
| Jul 8, 5:36 PM MDT | Special Weather Statement | GJT | Pitkin | 39 min |
Nearby
Flash Flood Watches in Colorado, 2021Every flash flood watch 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.