Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 3, NWS Grand Junction, CO

July 13, 2021Delta County, Mesa County, Colorado

NWS Grand Junction, CO issued this severe thunderstorm warning at Jul 13, 2021, 3:11 PM MDT for Delta County, Mesa County, Colorado. It was in force for 34 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 13, 2021, 3:11 PM MDT (21:11 UTC)
Expired: Jul 13, 2021, 3:45 PM MDT
In force: 34 min
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Delta County, CO, Mesa County, CO

The radar

The Grand Junction radar (KGJX), 43 km from the middle of the area, began a volume at 21:14 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, 9.2 hours before the alert went out and 67 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 27 J/kg
Mixed-layer CIN: -350 J/kg
Mixed-layer LCL: 3436 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

972 
WUUS55 KGJT 132111
SVRGJT
COC029-077-132145-
/O.NEW.KGJT.SV.W.0003.210713T2111Z-210713T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Junction CO
311 PM MDT Tue Jul 13 2021

The National Weather Service in Grand Junction has issued a

* Severe Thunderstorm Warning for...
  Northeastern Delta County in west central Colorado...
  East central Mesa County in west central Colorado...

* Until 345 PM MDT.

* At 310 PM MDT, a severe thunderstorm was located 13 miles southeast
  of Collbran, or 36 miles southwest of Glenwood Springs, moving 
  east at 10 mph. This storm was located over Grand Mesa National 
  Forest east of Crag Crest. 

  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.

* This severe thunderstorm will remain over mainly rural areas of 
  northeastern Delta and east central Mesa Counties east of Crag 
  Crest.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3911 10785 3916 10783 3917 10760 3908 10756
      3901 10764
TIME...MOT...LOC 2110Z 286DEG 10KT 3912 10775 

HAIL...1.00IN
WIND...60MPH
 
$$

Charnick

3 follow-up statements

867 
WWUS55 KGJT 132125
SVSGJT

Severe Weather Statement
National Weather Service Grand Junction CO
325 PM MDT Tue Jul 13 2021

COC029-077-132145-
/O.CON.KGJT.SV.W.0003.000000T0000Z-210713T2145Z/
Delta CO-Mesa CO-
325 PM MDT Tue Jul 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM MDT
FOR NORTHEASTERN DELTA AND EAST CENTRAL MESA COUNTIES...

At 324 PM MDT, a severe thunderstorm was located 16 miles southeast
of Collbran, or 35 miles southwest of Glenwood Springs, moving east 
at 10 mph. This storm was located east of Crag Crest in Grand Mesa 
National Forest.

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.

This severe thunderstorm will remain over mainly rural areas of 
northeastern Delta and east central Mesa Counties east of Crag Crest 
in Grand Mesa National Forest.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3909 10779 3914 10777 3917 10760 3908 10756
      3901 10764
TIME...MOT...LOC 2124Z 286DEG 10KT 3911 10770 

HAIL...1.00IN
WIND...60MPH
 
$$

Charnick

051 
WWUS55 KGJT 132138
SVSGJT

Severe Weather Statement
National Weather Service Grand Junction CO
338 PM MDT Tue Jul 13 2021

COC029-077-132145-
/O.CON.KGJT.SV.W.0003.000000T0000Z-210713T2145Z/
Delta CO-Mesa CO-
338 PM MDT Tue Jul 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM MDT
FOR NORTHEASTERN DELTA AND EASTERN MESA COUNTIES...

At 338 PM MDT, a severe thunderstorm was located 16 miles north of
Paonia, or 35 miles southwest of Glenwood Springs, moving east at 10
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.

This severe thunderstorm will remain over mainly rural areas of 
northeastern Delta and eastern Mesa Counties east of Crag Crest in 
Grand Mesa National Forest.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3908 10776 3913 10774 3917 10760 3908 10756
      3901 10764
TIME...MOT...LOC 2138Z 286DEG 10KT 3910 10765 

HAIL...1.00IN
WIND...60MPH
 
$$

Charnick

863 
WWUS55 KGJT 132145
SVSGJT

Severe Weather Statement
National Weather Service Grand Junction CO
345 PM MDT Tue Jul 13 2021

COC029-077-132155-
/O.EXP.KGJT.SV.W.0003.000000T0000Z-210713T2145Z/
Delta CO-Mesa CO-
345 PM MDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DELTA AND EASTERN
MESA COUNTIES HAS EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.

LAT...LON 3908 10776 3913 10774 3917 10760 3908 10756
      3901 10764
TIME...MOT...LOC 2145Z 286DEG 10KT 3910 10765 

$$

Charnick

The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 13, 11:51 AM MDT	Flash Flood Watch	GJT	Eagle, Garfield, Moffat, Pitkin, Rio Blanco, Routt	3 hr
Jul 13, 12:28 PM MDT	Special Weather Statement	GJT	Rio Blanco	47 min
Jul 13, 12:50 PM MDT	Special Weather Statement	GJT	San Juan	25 min
Jul 13, 12:52 PM MDT	Special Weather Statement	GJT		38 min
Jul 13, 1:28 PM MDT	Special Weather Statement	GJT	San Juan	47 min
Jul 13, 1:37 PM MDT	Special Weather Statement	GJT	Rio Blanco	38 min
Jul 13, 1:43 PM MDT	Special Weather Statement	GJT	Pitkin	47 min
Jul 13, 2:29 PM MDT	Flash Flood Warning	GJT	Hinsdale, Ouray	3 hr
Jul 13, 2:48 PM MDT	Special Weather Statement	GJT		42 min
Jul 13, 2:56 PM MDT	Special Weather Statement	GJT	Delta	49 min
Jul 13, 3:06 PM MDT	Flash Flood Warning Considerable damage threat	GJT	Eagle, Garfield	114 min
Jul 13, 3:27 PM MDT	Areal Flood Advisory	GJT	Ouray, San Miguel	3 hr
Jul 13, 3:33 PM MDT	Special Weather Statement	GJT	Mesa	42 min
Jul 13, 3:52 PM MDT	Severe Thunderstorm Warning	GJT	Delta, Mesa	23 min
Jul 13, 4:24 PM MDT	Special Weather Statement	GJT	Delta, Mesa	51 min
Jul 13, 4:59 PM MDT	Flash Flood Watch	GJT	Eagle, Garfield, Moffat, Pitkin, Rio Blanco, Routt	3 hr
Jul 13, 5:10 PM MDT	Special Weather Statement	GJT	Montrose	50 min
Jul 13, 5:21 PM MDT	Special Weather Statement	GJT		39 min
Jul 13, 5:33 PM MDT	Special Weather Statement	GJT	Montrose	42 min
Jul 13, 5:42 PM MDT	Special Weather Statement	GJT	Ouray	48 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2021 Every 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.