Alert archive / Colorado / Flash Flood Watches in 2021
Flash Flood Watch 19, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood watch at Jul 24, 2021, 3:51 AM MDT for 18 counties in Colorado; Grand County, San Juan County, Utah. It took effect at Jul 24, 2021, 11:46 AM MDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Jul 24, 2021, 3:51 AM MDT (09:51 UTC)
- In effect from
- Jul 24, 2021, 11:46 AM MDT
- Expired
- Jul 24, 2021, 9:00 PM MDT
- In force
- 9 hr
- Issued by
- NWS Grand Junction, CO
- Flood severity
- None
Counties Archuleta County, CO, Delta County, CO, Dolores County, CO, Eagle County, CO, Garfield County, CO, Gunnison County, CO, Hinsdale County, CO, La Plata County, CO, Mesa County, CO, Moffat County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, Pitkin County, CO, Rio Blanco County, CO, Routt County, CO, San Juan County, CO, San Miguel County, CO, Grand County, UT, San Juan County, UT
The radar
The Grand Junction radar (KGJX), 54 km from the middle of the area, began a volume at 09:54 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, 9.9 hours before the alert went out and 74 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
- 917 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 2718 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- 120 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 23, 11:41 PM MDT, 4 hours 10 minutes earlier.
Area forecast discussion, Jul 23, 11:41 PM MDT, 4 hours 10 minutes before
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</html>Hazardous weather outlook, Jul 23, 5:39 AM MDT, 22 hours 12 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 539 AM MDT Fri Jul 23 2021 COZ001>014-017>023-UTZ022>025-027>029-241145- 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- 539 AM MDT Fri Jul 23 2021 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Deep monsoonal moisture will result in thunderstorm development with the potential for heavy rainfall rates today. Localized flash flooding will be possible in response to heavy rains and saturated soils.The recent burn scars will be especially vulnerable with debris flows a likely impact. Gusty outflow winds will accompany the strongest storms and possibly small hail. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Daily scattered to numerous showers and thunderstorms can be expected through the weekend. Moderate to heavy rain and gusty winds will be the primary threats with storms. Localized flash flooding will be possible in response to heavy rains and saturated soils. Unsettled weather is expected into the new work week. .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.
The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 6:04 PM MDT | Areal Flood Advisory | GJT | Rio Blanco | 116 min |
| Jul 23, 6:11 PM MDT | Areal Flood Advisory | GJT | Delta | 2 hr |
| Jul 23, 6:17 PM MDT | Special Weather Statement | GJT | Delta | 28 min |
| Jul 23, 6:37 PM MDT | Special Weather Statement | GJT | 38 min | |
| Jul 23, 7:04 PM MDT | Areal Flood Advisory | GJT | Mesa, Montrose | 109 min |
| Jul 23, 7:14 PM MDT | Areal Flood Advisory | GJT | Garfield, Mesa | 3 hr |
| Jul 23, 8:44 PM MDT | Areal Flood Advisory | GJT | Dolores, San Miguel | 2 hr |
| Jul 24, 11:57 AM MDT | Special Weather Statement | GJT | Garfield | 48 min |
| Jul 24, 12:34 PM MDT | Areal Flood Advisory | GJT | Delta, Gunnison, Mesa, Pitkin | 3 hr |
| Jul 24, 12:41 PM MDT | Special Weather Statement | GJT | Delta | 49 min |
| Jul 24, 1:30 PM MDT | Special Weather Statement | GJT | Delta | 30 min |
| Jul 24, 1:30 PM MDT | Special Weather Statement | GJT | Garfield | 45 min |
| Jul 24, 1:32 PM MDT | Special Weather Statement | GJT | Ouray | 28 min |
| Jul 24, 1:36 PM MDT | Areal Flood Advisory | GJT | Garfield, Mesa | 13 min |
| Jul 24, 1:46 PM MDT | Areal Flood Advisory | GJT | San Miguel | 3 hr |
| Jul 24, 1:49 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 3 hr |
| Jul 24, 2:09 PM MDT | Areal Flood Advisory | GJT | San Miguel | 55 min |
| Jul 24, 2:15 PM MDT | Special Weather Statement | GJT | Montezuma | 30 min |
| Jul 24, 2:34 PM MDT | Areal Flood Advisory | GJT | Montrose, San Miguel | 30 min |
| Jul 24, 2:45 PM MDT | Special Weather Statement | GJT | Montezuma | 15 min |
| Jul 24, 3:03 PM MDT | Flash Flood Warning | GJT | Montrose, San Miguel | 3 hr |
| Jul 24, 3:12 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 82 min |
| Jul 24, 3:27 PM MDT | Areal Flood Advisory | GJT | Montezuma | 2 hr |
| Jul 24, 3:28 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 69 min |
| Jul 24, 3:45 PM MDT | Areal Flood Advisory | GJT | Montrose | 4 min |
| Jul 24, 3:47 PM MDT | Flash Flood Warning | GJT | Montrose | 3 hr |
| Jul 24, 3:55 PM MDT | Flash Flood Warning | GJT | Mesa, Montrose | 3 hr |
| Jul 23, 7:24 PM MDT | Areal Flood Advisory | GJT | Grand, San Juan | 3 hr |
| Jul 24, 1:26 PM MDT | Areal Flood Advisory | GJT | San Juan | 3 hr |
| Jul 24, 3:35 PM MDT | Flash Flood Warning | GJT | San Juan | 3 hr |
| Jul 24, 3:42 PM MDT | Flash Flood Warning | GJT | San Juan | 2 hr |
Nearby
Flash Flood Watches in Colorado, 2021Flash Flood Watches in Utah, 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.