Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 21, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 23, 2021, 1:58 PM MDT for Dolores County, Montezuma County, Colorado. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2021, 1:58 PM MDT (19:58 UTC)
- Expired
- Jul 23, 2021, 6:00 PM MDT
- In force
- 4 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Dolores County, CO, Montezuma County, CO
The radar
The Grand Junction radar (KGJX), 169 km from the middle of the area, began a volume at 20:01 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, 8.0 hours before the alert went out and 177 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
- 21 J/kg
- Mixed-layer CIN
- -153 J/kg
- Mixed-layer LCL
- 1904 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -41 m²/s²
- 0-3 km storm-relative helicity
- -27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
537
WGUS55 KGJT 231958
FFWGJT
COC033-083-240000-
/O.NEW.KGJT.FF.W.0021.210723T1958Z-210724T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
158 PM MDT Fri Jul 23 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
Central Dolores County in southwestern Colorado...
North Central Montezuma County in southwestern Colorado...
* Until 600 PM MDT.
* At 158 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.6 and 1.3 inches of
rain have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Stoner.
This includes the following streams and drainages...
Dolores River, Taylor Creek, House Creek, Lost Canyon Creek,
Hartman Draw, Pipe Creek, Spring Creek, Fish Creek, Little Taylor
Creek, Turkey Creek, West Dolores River, Stoner Creek and Beaver
Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
&&
LAT...LON 3759 10846 3760 10842 3765 10842 3765 10833
3761 10827 3762 10821 3759 10821 3759 10819
3755 10824 3752 10822 3743 10831 3745 10834
3743 10846 3746 10853 3748 10842 3751 10842
3751 10850 3753 10851 3755 10845
FLASH FLOOD...RADAR INDICATED
$$
as2 follow-up statements
491
WGUS75 KGJT 232157
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
357 PM MDT Fri Jul 23 2021
COC033-083-240000-
/O.CON.KGJT.FF.W.0021.000000T0000Z-210724T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dolores CO-Montezuma CO-
357 PM MDT Fri Jul 23 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING
FOR CENTRAL DOLORES AND NORTH CENTRAL MONTEZUMA COUNTIES...
At 357 PM MDT, Doppler radar indicated thunderstorms have decrease
and only light rain is falling over the warned area. Other storms
are forming in the region. Between 0.6 and 1.5 inches of rain have
fallen. Flash flooding is ongoing. Flood waters can take hours to
travel downstream.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Stoner.
This includes the following streams and drainages...
Dolores River, Taylor Creek, House Creek, Lost Canyon Creek,
Hartman Draw, Pipe Creek, Spring Creek, Fish Creek, Little Taylor
Creek, Turkey Creek, West Dolores River, Stoner Creek and Beaver
Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
&&
LAT...LON 3759 10846 3760 10842 3765 10842 3765 10833
3761 10827 3762 10821 3759 10821 3759 10819
3755 10824 3752 10822 3743 10831 3745 10834
3743 10846 3746 10853 3748 10842 3751 10842
3751 10850 3753 10851 3755 10845
FLASH FLOOD...RADAR INDICATED
$$
as228
WGUS75 KGJT 232352
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
552 PM MDT Fri Jul 23 2021
COC033-083-240002-
/O.EXP.KGJT.FF.W.0021.000000T0000Z-210724T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dolores CO-Montezuma CO-
552 PM MDT Fri Jul 23 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING FOR
CENTRAL DOLORES AND NORTH CENTRAL MONTEZUMA COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 300 AM MDT Saturday for
a portion of southwest Colorado.
LAT...LON 3759 10846 3760 10842 3765 10842 3765 10833
3761 10827 3762 10821 3759 10821 3759 10819
3755 10824 3752 10822 3743 10831 3745 10834
3743 10846 3746 10853 3748 10842 3751 10842
3751 10850 3753 10851 3755 10845
$$
asThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 12:18 PM MDT | Special Weather Statement | GJT | Delta | 27 min |
| Jul 23, 12:21 PM MDT | Special Weather Statement | GJT | 39 min | |
| Jul 23, 12:46 PM MDT | Areal Flood Advisory | GJT | Montezuma | 3 hr |
| Jul 23, 12:48 PM MDT | Special Weather Statement | GJT | Montezuma | 42 min |
| Jul 23, 1:22 PM MDT | Areal Flood Advisory | GJT | Dolores, Montezuma | 3 hr |
| Jul 23, 2:17 PM MDT | Areal Flood Advisory | GJT | Dolores, Montezuma, San Juan, San Miguel | 3 hr |
| Jul 23, 3:07 PM MDT | Special Weather Statement | GJT | Chaffee | 38 min |
| Jul 23, 3:26 PM MDT | Areal Flood Advisory | GJT | Ouray | 3 hr |
| Jul 23, 3:42 PM MDT | Special Weather Statement | GJT | Chaffee | 33 min |
| Jul 23, 3:50 PM MDT | Special Weather Statement | GJT | Archuleta | 40 min |
| Jul 23, 3:50 PM MDT | Special Weather Statement | GJT | La Plata | 25 min |
| Jul 23, 4:16 PM MDT | Special Weather Statement | GJT | Delta | 29 min |
| Jul 23, 4:28 PM MDT | Areal Flood Advisory | GJT | Gunnison | 3 hr |
| Jul 23, 4:57 PM MDT | Areal Flood Advisory | GJT | Hinsdale, Ouray, San Juan | 3 hr |
| Jul 23, 5:11 PM MDT | Special Weather Statement | GJT | Mesa | 49 min |
| Jul 23, 5:12 PM MDT | Areal Flood Advisory | GJT | Mesa | 3 hr |
| Jul 23, 5:19 PM MDT | Areal Flood Advisory | GJT | Garfield | 3 hr |
| Jul 23, 5:25 PM MDT | Areal Flood Advisory | GJT | Garfield, Mesa | 3 hr |
| Jul 23, 5:29 PM MDT | Areal Flood Advisory | GJT | Garfield | 3 hr |
| Jul 23, 5:34 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 3 hr |
| Jul 23, 5:36 PM MDT | Areal Flood Advisory | GJT | Gunnison, Hinsdale | 3 hr |
| Jul 23, 5:39 PM MDT | Special Weather Statement | GJT | Hinsdale | 51 min |
| Jul 23, 5:47 PM MDT | Special Weather Statement | GJT | Delta | 43 min |
| Jul 23, 5:51 PM MDT | Areal Flood Advisory | GJT | Montrose | 3 hr |
Nearby
Flash Flood Warnings in Colorado, 2021Every flash flood warning 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.