Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 150, NWS Goodland, KS

July 9, 2021Cheyenne County, Colorado

NWS Goodland, KS issued this severe thunderstorm warning at Jul 9, 2021, 9:01 PM MDT for Cheyenne County, Colorado. It was in force for 44 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 9, 2021, 9:01 PM MDT (03:01 UTC)
Expired: Jul 9, 2021, 9:45 PM MDT
In force: 44 min
Issued by: NWS Goodland, KS
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

County Cheyenne County, CO

The radar

The Goodland radar (KGLD), 119 km from the middle of the area, began a volume at 03:00 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.

What was reported inside it

Time	Report	Where	Remark
Jul 9, 9:08 PM MDT	HIGH SUST WINDS 40	1 W Kit Carson, CO	MESONET STATION UP729 0.5 W KIT CARSON (UPR) GUSTING TO 51MPH.
Jul 9, 9:14 PM MDT	HAIL 0.25	Kit Carson, CO	DISPATCH ALSO REPORTED NEAR ZERO VISIBILITY DUE TO BLOWING DUST WITH THE STORM.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 9, 8:37 PM MDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 3.0 hours before the alert went out and 122 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: 807 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 3619 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

739 
WUUS53 KGLD 100301
SVRGLD
COC017-100345-
/O.NEW.KGLD.SV.W.0150.210710T0301Z-210710T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Goodland KS
901 PM MDT Fri Jul 9 2021

The National Weather Service in Goodland has issued a

* Severe Thunderstorm Warning for...
  Western Cheyenne County in east central Colorado...

* Until 945 PM MDT.

* At 901 PM MDT, severe thunderstorms were located along a line
  extending from 19 miles south of Vona to 17 miles west of Kit
  Carson, moving south at 40 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Public reported 25 miles south of Flagler.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Kit Carson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

These thunderstorms will produce damaging winds resulting in areas of
near zero visibility in blowing dirt. Use extreme caution if you must
travel and be alert for rapidly changing visibility.

&&

LAT...LON 3886 10316 3903 10296 3903 10265 3863 10243
      3861 10257 3861 10317
TIME...MOT...LOC 0301Z 344DEG 37KT 3902 10275 3870 10310 

HAIL...<.75IN
WIND...70MPH
 
$$

Lundquist

3 follow-up statements

331 
WWUS53 KGLD 100316
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
916 PM MDT Fri Jul 9 2021

COC017-100345-
/O.CON.KGLD.SV.W.0150.000000T0000Z-210710T0345Z/
Cheyenne CO-
916 PM MDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM MDT
FOR WESTERN CHEYENNE COUNTY IN EAST CENTRAL COLORADO...

At 915 PM MDT, a severe thunderstorm was located 5 miles south of Kit
Carson, or 24 miles west of Cheyenne Wells, moving southeast at 50
mph.

HAZARD...70 mph wind gusts.

SOURCE...Public.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Kit Carson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This thunderstorm will produce damaging winds resulting in areas of
near zero visibility in blowing dirt. Use extreme caution if you must
travel and be alert for rapidly changing visibility.

&&

LAT...LON 3875 10304 3891 10289 3901 10265 3863 10243
      3861 10257 3861 10311
TIME...MOT...LOC 0315Z 333DEG 43KT 3869 10276 

HAIL...<.75IN
WIND...70MPH
 
$$

Lundquist

450 
WWUS53 KGLD 100324
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
924 PM MDT Fri Jul 9 2021

COC017-100345-
/O.CON.KGLD.SV.W.0150.000000T0000Z-210710T0345Z/
Cheyenne CO-
924 PM MDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM MDT
FOR SOUTHWESTERN CHEYENNE COUNTY IN EAST CENTRAL COLORADO...

At 923 PM MDT, a severe thunderstorm was located 9 miles north of
Eads, or 25 miles southwest of Cheyenne Wells, moving south at 45
mph.

HAZARD...70 mph wind gusts.

SOURCE...Public.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.  Near zero visibility in 
         the blowing dust has also been reported.

Locations impacted include...
Kit Carson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This thunderstorm will produce damaging winds resulting in areas of
near zero visibility in blowing dirt. Use extreme caution if you must
travel and be alert for rapidly changing visibility.

&&

LAT...LON 3872 10295 3885 10281 3891 10259 3863 10243
      3861 10257 3861 10298
TIME...MOT...LOC 0323Z 344DEG 37KT 3861 10273 

HAIL...<.75IN
WIND...70MPH
 
$$

Lundquist

000 
WWUS53 KGLD 100337
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
937 PM MDT Fri Jul 9 2021

COC017-100347-
/O.EXP.KGLD.SV.W.0150.000000T0000Z-210710T0345Z/
Cheyenne CO-
937 PM MDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CHEYENNE COUNTY
IN EAST CENTRAL COLORADO WILL EXPIRE AT 945 PM MDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 100 AM MDT for
east central Colorado.

LAT...LON 3872 10295 3885 10281 3891 10259 3863 10243
      3861 10257 3861 10298
TIME...MOT...LOC 0337Z 344DEG 37KT 3849 10269 

$$

Lundquist

The office that day

Everything else NWS Goodland, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 9, 7:01 PM MDT	Special Weather Statement	GLD	Kit Carson	14 min
Jul 9, 7:17 PM MDT	Special Weather Statement	GLD	Kit Carson	28 min
Jul 9, 7:46 PM MDT	Special Weather Statement	GLD	Kit Carson	14 min
Jul 9, 7:50 PM MDT	Special Weather Statement	GLD	Cheyenne	25 min
Jul 9, 7:56 PM MDT	Special Weather Statement	GLD	Kit Carson	19 min
Jul 9, 8:03 PM MDT	Special Weather Statement	GLD	Kit Carson	27 min
Jul 9, 8:23 PM MDT	Special Weather Statement	GLD	Kit Carson	37 min
Jul 9, 8:51 PM MDT	Special Weather Statement	GLD	Cheyenne	24 min
Jul 9, 8:56 PM MDT	Tornado Warning	GLD	Kit Carson	21 min
Jul 10, 12:23 AM MDT	Special Weather Statement	GLD	Yuma	37 min
Jul 10, 1:15 AM MDT	Special Weather Statement	GLD	Kit Carson	45 min
Jul 10, 1:47 AM MDT	Special Weather Statement	GLD	Cheyenne	43 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.