Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 13, NWS Grand Junction, CO
NWS Grand Junction, CO issued this severe thunderstorm warning at Jul 29, 2021, 3:18 PM MDT for Montrose County, San Miguel County, Colorado. It was in force for 27 min. 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 29, 2021, 3:18 PM MDT (21:18 UTC)
- Expired
- Jul 29, 2021, 3:45 PM MDT
- In force
- 27 min
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Montrose County, CO, San Miguel County, CO
The radar
The Grand Junction radar (KGJX), 113 km from the middle of the area, began a volume at 21:18 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, 9.3 hours before the alert went out and 121 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
- 12 J/kg
- Mixed-layer CIN
- -398 J/kg
- Mixed-layer LCL
- 1614 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
852
WUUS55 KGJT 292118
SVRGJT
COC085-113-292145-
/O.NEW.KGJT.SV.W.0013.210729T2118Z-210729T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Junction CO
318 PM MDT Thu Jul 29 2021
The National Weather Service in Grand Junction has issued a
* Severe Thunderstorm Warning for...
North central San Miguel County in southwestern Colorado...
Southern Montrose County in west central Colorado...
* Until 345 PM MDT.
* At 317 PM MDT, a severe thunderstorm was located near Norwood, or
38 miles southwest of Montrose, moving north at 15 mph.
HAZARD...60 mph wind gusts, quarter size hail and heavy hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Norwood.
This includes the following highways...
Colorado 141 between mile markers 50 and 51.
Colorado 145 between mile markers 101 and 108.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3800 10826 3799 10830 3799 10837 3815 10852
3818 10828
TIME...MOT...LOC 2117Z 171DEG 13KT 3803 10831
HAIL...1.00IN
WIND...60MPH
$$
ERW2 follow-up statements
067
WWUS55 KGJT 292127
SVSGJT
Severe Weather Statement
National Weather Service Grand Junction CO
327 PM MDT Thu Jul 29 2021
COC085-113-292145-
/O.CON.KGJT.SV.W.0013.000000T0000Z-210729T2145Z/
San Miguel CO-Montrose CO-
327 PM MDT Thu Jul 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM MDT
FOR NORTH CENTRAL SAN MIGUEL AND SOUTHERN MONTROSE COUNTIES...
At 326 PM MDT, a severe thunderstorm was located near Norwood,
moving north at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Norwood.
This includes the following highways...
Colorado 141 between mile markers 50 and 51.
Colorado 145 between mile markers 101 and 108.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3803 10827 3804 10837 3815 10852 3818 10828
TIME...MOT...LOC 2126Z 171DEG 13KT 3806 10832
HAIL...1.00IN
WIND...60MPH
$$
15966
WWUS55 KGJT 292142
SVSGJT
Severe Weather Statement
National Weather Service Grand Junction CO
342 PM MDT Thu Jul 29 2021
COC085-113-292150-
/O.EXP.KGJT.SV.W.0013.000000T0000Z-210729T2145Z/
San Miguel CO-Montrose CO-
342 PM MDT Thu Jul 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SAN MIGUEL AND
SOUTHERN MONTROSE COUNTIES WILL EXPIRE AT 345 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 3803 10827 3804 10837 3815 10852 3818 10828
TIME...MOT...LOC 2140Z 171DEG 13KT 3810 10833
$$
ERWThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 6:00 PM MDT | Severe Thunderstorm Warning | GJT | Delta, Mesa | 30 min |
| Jul 28, 6:30 PM MDT | Severe Thunderstorm Warning | GJT | Garfield, Mesa | 60 min |
| Jul 28, 6:32 PM MDT | Flash Flood Warning | GJT | Mesa | 54 min |
| Jul 28, 7:21 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 46 min |
| Jul 28, 7:31 PM MDT | Areal Flood Advisory | GJT | Mesa | 119 min |
| Jul 28, 7:32 PM MDT | Special Weather Statement | GJT | Mesa | 43 min |
| Jul 29, 1:43 PM MDT | Special Weather Statement | GJT | Mesa | 47 min |
| Jul 29, 2:02 PM MDT | Special Weather Statement | GJT | San Miguel | 43 min |
| Jul 29, 2:04 PM MDT | Special Weather Statement | GJT | Dolores | 41 min |
| Jul 29, 2:36 PM MDT | Areal Flood Advisory | GJT | Dolores, San Miguel | 3 hr |
| Jul 29, 2:53 PM MDT | Areal Flood Advisory | GJT | Archuleta | 112 min |
| Jul 29, 3:07 PM MDT | Severe Thunderstorm Warning | GJT | Montezuma | 23 min |
| Jul 29, 3:28 PM MDT | Severe Thunderstorm Warning | GJT | Montezuma | 32 min |
| Jul 29, 3:33 PM MDT | Special Weather Statement | GJT | Ouray | 42 min |
| Jul 29, 3:47 PM MDT | Flash Flood Warning | GJT | San Miguel | 3 hr |
| Jul 29, 3:52 PM MDT | Severe Thunderstorm Warning | GJT | Montezuma | 23 min |
| Jul 29, 4:11 PM MDT | Flash Flood Warning | GJT | Pitkin | 4 hr |
| Jul 29, 4:12 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 66 min |
| Jul 29, 4:43 PM MDT | Flash Flood Warning | GJT | Montezuma | 3 hr |
| Jul 29, 4:54 PM MDT | Special Weather Statement | GJT | Delta | 51 min |
| Jul 29, 4:54 PM MDT | Special Weather Statement | GJT | Montezuma | 51 min |
| Jul 29, 4:58 PM MDT | Areal Flood Advisory | GJT | Montezuma | 3 hr |
| Jul 29, 5:10 PM MDT | Special Weather Statement | GJT | Garfield | 50 min |
| Jul 29, 5:11 PM MDT | Special Weather Statement | GJT | Dolores | 49 min |
| Jul 29, 5:14 PM MDT | Special Weather Statement | GJT | 46 min | |
| Jul 29, 5:29 PM MDT | Special Weather Statement | GJT | Montezuma | 46 min |
| Jul 29, 5:34 PM MDT | Areal Flood Advisory | GJT | Montezuma | 3 hr |
| Jul 29, 5:44 PM MDT | Special Weather Statement | GJT | Garfield | 46 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2021Every severe thunderstorm 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.