Alert archive / Colorado / Flash Flood Watches in 2021
Flash Flood Watch 21, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood watch at Jul 26, 2021, 12:03 PM MDT for 12 counties in Colorado; Grand County, San Juan County, Utah. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Jul 26, 2021, 12:03 PM MDT (18:03 UTC)
- Expired
- Jul 26, 2021, 10:00 PM MDT
- In force
- 10 hr
- Issued by
- NWS Grand Junction, CO
- Flood severity
- None
Counties Delta County, CO, Dolores County, CO, Eagle County, CO, Garfield County, CO, Mesa County, CO, Moffat County, CO, Montrose County, CO, Ouray County, CO, Pitkin County, CO, Rio Blanco County, CO, Routt County, CO, San Miguel County, CO, Grand County, UT, San Juan County, UT
The radar
The Grand Junction radar (KGJX), 10 km from the middle of the area, began a volume at 18:05 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 35 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
- 3 J/kg
- Mixed-layer CIN
- -335 J/kg
- Mixed-layer LCL
- 1886 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
914 WGUS65 KGJT 261803 FFAGJT URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Grand Junction CO 1203 PM MDT Mon Jul 26 2021 UTZ028-270400- /O.NEW.KGJT.FF.A.0021.210726T1803Z-210727T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ La Sal and Abajo Mountains- Including the cities of Monticello 1203 PM MDT Mon Jul 26 2021 ...FLASH FLOOD WATCH IN EFFECT UNTIL 10 PM MDT THIS EVENING... The National Weather Service in Grand Junction has issued a * Flash Flood Watch for a portion of southeast Utah, including the following area, La Sal and Abajo Mountains. * Until 10 PM MDT this evening. * Monsoonal moisture remains entrenched over portions of western Colorado and southeast Utah. This will lead to another round of afternoon thunderstorms capable of producing heavy rainfall. Several areas have received heavy rainfall the past few days and additional amounts could lead to excess runoff and localized flash flooding. Rainfall amounts of a half to one inch in a short duration will exacerbate flooding concerns in the watch area. * This includes the Pack Creek Fire Burn Scar. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ COZ020-270400- /O.NEW.KGJT.FF.A.0021.210726T1803Z-210727T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Paradox Valley/Lower Dolores River- Including the cities of Gateway and Nucla 1203 PM MDT Mon Jul 26 2021 ...FLASH FLOOD WATCH IN EFFECT UNTIL 10 PM MDT THIS EVENING... The National Weather Service in Grand Junction has issued a * Flash Flood Watch for a portion of southwest Colorado, including the following area, Paradox Valley/Lower Dolores River. * Until 10 PM MDT this evening. * Monsoonal moisture remains entrenched over portions of western Colorado and southeast Utah. This will lead to another round of afternoon thunderstorms capable of producing heavy rainfall. Several areas have received heavy rainfall the past few days and additional amounts could lead to excess runoff and localized flash flooding. Rainfall amounts of a half to one inch in a short duration will exacerbate flooding concerns in the watch area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ COZ017-270400- /O.NEW.KGJT.FF.A.0021.210726T1803Z-210727T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Uncompahgre Plateau and Dallas Divide- Including the cities of Ridgway and Glade Park 1203 PM MDT Mon Jul 26 2021 ...FLASH FLOOD WATCH IN EFFECT UNTIL 10 PM MDT THIS EVENING... The National Weather Service in Grand Junction has issued a * Flash Flood Watch for a portion of west central Colorado, including the following area, Uncompahgre Plateau and Dallas Divide. * Until 10 PM MDT this evening. * Monsoonal moisture remains entrenched over portions of western Colorado and southeast Utah. This will lead to another round of afternoon thunderstorms capable of producing heavy rainfall. Several areas have received heavy rainfall the past few days and additional amounts could lead to excess runoff and localized flash flooding. Rainfall amounts of a half to one inch in a short duration will exacerbate flooding concerns in the watch area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ MMS
2 follow-up statements
962 WGUS65 KGJT 270136 FFAGJT URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Grand Junction CO 736 PM MDT Mon Jul 26 2021 COZ008-010-013-270400- /O.EXA.KGJT.FF.A.0021.000000T0000Z-210727T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central Colorado River Basin-Gore and Elk Mountains/Central Mountain Valleys-Flat Tops- 736 PM MDT Mon Jul 26 2021 ...FLASH FLOOD WATCH FOR THE GRIZZLY CREEK FIRE BURN AREA IN EFFECT UNTIL 10 PM MDT THIS EVENING... The National Weather Service in Grand Junction has expanded the * Flash Flood Watch to include portions of northwest Colorado and west central Colorado, including the following areas, in northwest Colorado, Flat Tops. In west central Colorado, Central Colorado River Basin and Gore and Elk Mountains/Central Mountain Valleys. * Until 10 PM MDT this evening. * National Weather Service Meteorologists are forecasting possible heavy rainfall over the Grizzly Creek Fire Burn Area, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ UTZ028-270400- /O.CON.KGJT.FF.A.0021.000000T0000Z-210727T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ La Sal and Abajo Mountains- Including the cities of Monticello 736 PM MDT Mon Jul 26 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM MDT THIS EVENING... The Flash Flood Watch continues for * A portion of southeast Utah, including the following area, La Sal and Abajo Mountains. * Until 10 PM MDT this evening. * Monsoonal moisture remains entrenched over portions of western Colorado and southeast Utah. This will lead to another round of afternoon thunderstorms capable of producing heavy rainfall. Several areas have received heavy rainfall the past few days and additional amounts could lead to excess runoff and localized flash flooding. Rainfall amounts of a half to one inch in a short duration will exacerbate flooding concerns in the watch area. * This includes the Pack Creek Fire Burn Scar. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ COZ020-270400- /O.CON.KGJT.FF.A.0021.000000T0000Z-210727T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Paradox Valley/Lower Dolores River- Including the cities of Gateway and Nucla 736 PM MDT Mon Jul 26 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM MDT THIS EVENING... The Flash Flood Watch continues for * A portion of southwest Colorado, including the following area, Paradox Valley/Lower Dolores River. * Until 10 PM MDT this evening. * Monsoonal moisture remains entrenched over portions of western Colorado and southeast Utah. This will lead to another round of afternoon thunderstorms capable of producing heavy rainfall. Several areas have received heavy rainfall the past few days and additional amounts could lead to excess runoff and localized flash flooding. Rainfall amounts of a half to one inch in a short duration will exacerbate flooding concerns in the watch area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ COZ017-270400- /O.CON.KGJT.FF.A.0021.000000T0000Z-210727T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Uncompahgre Plateau and Dallas Divide- Including the cities of Ridgway and Glade Park 736 PM MDT Mon Jul 26 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM MDT THIS EVENING... The Flash Flood Watch continues for * A portion of west central Colorado, including the following area, Uncompahgre Plateau and Dallas Divide. * Until 10 PM MDT this evening. * Monsoonal moisture remains entrenched over portions of western Colorado and southeast Utah. This will lead to another round of afternoon thunderstorms capable of producing heavy rainfall. Several areas have received heavy rainfall the past few days and additional amounts could lead to excess runoff and localized flash flooding. Rainfall amounts of a half to one inch in a short duration will exacerbate flooding concerns in the watch area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ NL
861 WGUS65 KGJT 270357 FFAGJT Flood Watch National Weather Service Grand Junction CO 957 PM MDT Mon Jul 26 2021 COZ008-010-013-017-020-UTZ028-270500- /O.EXP.KGJT.FF.A.0021.000000T0000Z-210727T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central Colorado River Basin-Gore and Elk Mountains/Central Mountain Valleys-Flat Tops-Uncompahgre Plateau and Dallas Divide-Paradox Valley/Lower Dolores River-La Sal and Abajo Mountains- Including the cities of Eagle, Edwards, Glenwood Springs, Carbondale, Basalt, Aspen, Vail, Snowmass, Buford, Trappers Lake, Ridgway, Glade Park, Gateway, Nucla, and Monticello 957 PM MDT Mon Jul 26 2021 ...FLASH FLOOD WATCH FOR THE GRIZZLY CREEK FIRE BURN AREA WILL EXPIRE AT 10 PM MDT THIS EVENING... The Flash Flood Watch for portions of Colorado and southeast Utah, including the following areas, in Colorado, Central Colorado River Basin, Flat Tops, Gore and Elk Mountains/Central Mountain Valleys, Paradox Valley/Lower Dolores River and Uncompahgre Plateau and Dallas Divide. In southeast Utah, La Sal and Abajo Mountains will expire at 10 PM MDT this evening. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ NL
The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 6:03 PM MDT | Special Weather Statement | GJT | 42 min | |
| Jul 25, 6:51 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 114 min |
| Jul 25, 7:19 PM MDT | Flash Flood Warning | GJT | Mesa | 3 hr |
| Jul 25, 7:39 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 81 min |
| Jul 25, 8:03 PM MDT | Special Weather Statement | GJT | Mesa | 42 min |
| Jul 25, 8:42 PM MDT | Areal Flood Advisory | GJT | Mesa | 3 hr |
| Jul 25, 11:03 PM MDT | Areal Flood Advisory | GJT | Mesa | 2 hr |
| Jul 25, 11:35 PM MDT | Flash Flood Warning | GJT | Mesa | 115 min |
| Jul 26, 4:06 PM MDT | Areal Flood Advisory | GJT | La Plata | 3 hr |
| Jul 26, 4:37 PM MDT | Areal Flood Advisory | GJT | Montezuma | 3 hr |
| Jul 26, 5:14 PM MDT | Areal Flood Advisory | GJT | Dolores | 3 hr |
| Jul 26, 5:50 PM MDT | Flash Flood Warning | GJT | Mesa, Montrose | 114 min |
| Jul 26, 5:52 PM MDT | Special Weather Statement | GJT | 38 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.