Alert archive / Colorado / Flash Flood Watches in 2021
Flash Flood Watch 33, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood watch at Sep 28, 2021, 12:06 PM MDT for 6 counties in Colorado. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Sep 28, 2021, 12:06 PM MDT (18:06 UTC)
- Expired
- Sep 28, 2021, 9:00 PM MDT
- In force
- 9 hr
- 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 18:07 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, 6.1 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
- 2319 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Sep 28, 11:48 AM MDT, 18 minutes earlier.
Area forecast discussion, Sep 28, 11:48 AM MDT, 18 minutes before
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</html>Hazardous weather outlook, Sep 28, 4:36 AM MDT, 7 hours 30 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 436 AM MDT Tue Sep 28 2021 COZ001>014-017>023-UTZ022>025-027>029-291045- 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- 436 AM MDT Tue Sep 28 2021 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Showers and storms will spread northward today and become more widespread this evening as another storm system pushes in from the west. Storms will be capable of brief moderate rain and wind gusts to 40 mph. The focus shifts across areas along and north of I-70 for the best precipitation potential this evening into the overnight hours. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Showers and storms will continue on Wednesday as a Pacific disturbance tracks across the northern portion of the forecast area. Temperatures will be much cooler with below normal readings. Drier air pushes in from the west late in the week with afternoon storms possible over the high terrain along the divide. .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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 4:26 AM MDT | Dense Fog Advisory | GJT | La Plata | 3 hr |
| Sep 28, 2:59 PM MDT | Areal Flood Advisory | GJT | Mesa | 89 min |
| Sep 28, 3:05 PM MDT | Areal Flood Advisory | GJT | Rio Blanco | 115 min |
| Sep 28, 4:03 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 97 min |
| Sep 28, 5:44 PM MDT | Special Weather Statement | GJT | Mesa | 31 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.