Alert archive / Colorado / Flash Flood Watches in 2021
Flash Flood Watch 14, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood watch at Jul 14, 2021, 2:19 AM MDT for 17 counties in Colorado; Grand County, San Juan County, Utah. It took effect at Jul 14, 2021, 12:00 PM MDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Jul 14, 2021, 2:19 AM MDT (08:19 UTC)
- In effect from
- Jul 14, 2021, 12:00 PM MDT
- Expired
- Jul 14, 2021, 8:03 PM MDT
- In force
- 8 hr
- Issued by
- NWS Grand Junction, CO
- Flood severity
- None
Counties Archuleta 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), 55 km from the middle of the area, began a volume at 08:20 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
Albuquerq/Krtlnd, NM (KABQ), launched 00:00Z, 8.3 hours before the alert went out and 414 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
- 377 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 2810 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -46 m²/s²
- 0-3 km storm-relative helicity
- -10 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 13, 11:31 PM MDT, 2 hours 48 minutes earlier.
Area forecast discussion, Jul 13, 11:31 PM MDT, 2 hours 48 minutes before
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</html>Hazardous weather outlook, Jul 13, 2:52 AM MDT, 23 hours 27 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 252 AM MDT Tue Jul 13 2021 COZ001>014-017>023-UTZ022>025-027>029-141300- 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- 252 AM MDT Tue Jul 13 2021 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Smoky skies will continue across the region through at least this morning. Scattered to numerous showers and thunderstorms will develop this afternoon with storms producing gusty outflow winds as well as brief moderate to heavy rain. Isolated activity will linger overnight, particularly down south. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Another round of widespread showers and thunderstorms is expected for Wednesday with slow moving storms capable of producing heavy rain. Drier conditions look to return for the end of the week as high pressure returns, though diurnal storms will persist over the higher terrain through the weekend. .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.
In the hours before
Local storm report, Jul 13, 10:02 PM MDT, 4 hours 17 minutes before
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</html>Local storm report, Jul 14, 2:04 AM MDT, 15 minutes before
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</html>The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 7:46 PM MDT | Special Weather Statement | GJT | Dolores | 44 min |
| Jul 14, 1:59 PM MDT | Special Weather Statement | GJT | Garfield | 46 min |
| Jul 14, 2:15 PM MDT | Flash Flood Warning | GJT | Garfield | 113 min |
| Jul 14, 2:26 PM MDT | Severe Thunderstorm Warning | GJT | Garfield, Mesa | 34 min |
| Jul 14, 3:16 PM MDT | Special Weather Statement | GJT | Garfield | 44 min |
| Jul 14, 3:35 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 115 min |
| Jul 14, 5:19 PM MDT | Special Weather Statement | GJT | Mesa | 41 min |
| Jul 14, 3:17 PM MDT | Special Weather Statement | GJT | Uintah | 43 min |
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.