Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 169, NWS Goodland, KS

July 18, 2021Cheyenne County, Colorado

NWS Goodland, KS issued this severe thunderstorm warning at Jul 18, 2021, 1:39 PM MDT for Cheyenne County, Colorado. It was in force for 45 min. 1 report 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 18, 2021, 1:39 PM MDT (19:39 UTC)
Expired: Jul 18, 2021, 2:24 PM MDT
In force: 45 min
Issued by: NWS Goodland, KS
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Cheyenne County, CO

The radar

The Goodland radar (KGLD), 94 km from the middle of the area, began a volume at 19:39 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 18, 1:40 PM MDT	HAIL 0.75	4 S Cheyenne Wells, CO	CALLER ALSO MENTIONED STORM PRECIPITATION OF 1 INCH.

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

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 7.7 hours before the alert went out and 150 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: 2 J/kg
Mixed-layer CIN: -396 J/kg
Mixed-layer LCL: 2164 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

297 
WUUS53 KGLD 181939
SVRGLD
COC017-182045-
/O.NEW.KGLD.SV.W.0169.210718T1939Z-210718T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Goodland KS
139 PM MDT Sun Jul 18 2021

The National Weather Service in Goodland has issued a

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

* Until 245 PM MDT.

* At 139 PM MDT, a severe thunderstorm was located 8 miles southwest
  of Cheyenne Wells, moving southeast at 5 mph.

  HAZARD...60 mph wind gusts and half dollar 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
  southeastern Cheyenne County in east central Colorado.

People attending Cheyenne County Fairgrounds should seek safe shelter
immediately!

This includes Highway 385 between mile markers 136 and 151.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3873 10261 3887 10227 3863 10207 3861 10210
      3861 10254
TIME...MOT...LOC 1939Z 312DEG 6KT 3873 10246 

HAIL...1.25IN
WIND...60MPH
 
$$

Lundquist

3 follow-up statements

903 
WWUS53 KGLD 181959
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
159 PM MDT Sun Jul 18 2021

COC017-182045-
/O.CON.KGLD.SV.W.0169.000000T0000Z-210718T2045Z/
Cheyenne CO-
159 PM MDT Sun Jul 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR SOUTHEASTERN CHEYENNE COUNTY IN EAST CENTRAL COLORADO...

At 158 PM MDT, a severe thunderstorm was located 8 miles south of
Cheyenne Wells, moving southeast 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.

Locations impacted include...
Cheyenne Wells.

People attending Cheyenne County Fairgrounds should seek safe shelter
immediately!

This includes Highway 385 between mile markers 136 and 151.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3873 10261 3887 10227 3863 10207 3861 10210
      3861 10254
TIME...MOT...LOC 1958Z 302DEG 8KT 3870 10236 

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

Lundquist

518 
WWUS53 KGLD 182014
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
214 PM MDT Sun Jul 18 2021

COC017-182045-
/O.CON.KGLD.SV.W.0169.000000T0000Z-210718T2045Z/
Cheyenne CO-
214 PM MDT Sun Jul 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR SOUTHEASTERN CHEYENNE COUNTY IN EAST CENTRAL COLORADO...

At 213 PM MDT, a severe thunderstorm was located 14 miles southwest
of Cheyenne Wells, moving east 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.

This severe thunderstorm will remain over mainly rural areas of
southeastern Cheyenne County in east central Colorado.

This includes Highway 385 between mile markers 136 and 146.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3873 10261 3877 10247 3877 10227 3862 10214
      3861 10254
TIME...MOT...LOC 2013Z 261DEG 13KT 3867 10252 

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

Lundquist

240 
WWUS53 KGLD 182024
SVSGLD

Severe Weather Statement
National Weather Service Goodland KS
224 PM MDT Sun Jul 18 2021

COC017-182034-
/O.CAN.KGLD.SV.W.0169.000000T0000Z-210718T2045Z/
Cheyenne CO-
224 PM MDT Sun Jul 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHEYENNE COUNTY
IN EAST CENTRAL COLORADO IS CANCELLED...
                
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 has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

LAT...LON 3873 10261 3877 10247 3877 10227 3862 10214
      3861 10254
TIME...MOT...LOC 2021Z 312DEG 6KT 3866 10250 

$$

Lundquist

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 10:44 PM MDT	Special Weather Statement	GLD	Kit Carson	61 min
Jul 17, 11:38 PM MDT	Special Weather Statement	GLD	Cheyenne, Kit Carson	82 min
Jul 17, 11:56 PM MDT	Special Weather Statement	GLD	Yuma	64 min
Jul 18, 12:17 PM MDT	Severe Thunderstorm Warning	GLD	Kit Carson	58 min
Jul 18, 12:45 PM MDT	Special Weather Statement	GLD	Cheyenne	15 min
Jul 18, 12:53 PM MDT	Severe Thunderstorm Warning	GLD	Kit Carson	39 min
Jul 18, 12:58 PM MDT	Special Weather Statement	GLD	Cheyenne	17 min
Jul 18, 1:14 PM MDT	Severe Thunderstorm Warning	GLD	Cheyenne	29 min
Jul 18, 1:35 PM MDT	Special Weather Statement	GLD	Cheyenne	25 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.