Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 155, NWS Denver/Boulder, CO

September 14, 2021Elbert County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Sep 14, 2021, 2:08 PM MDT for Elbert County, Colorado. It was in force for 52 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: Sep 14, 2021, 2:08 PM MDT (20:08 UTC)
Expired: Sep 14, 2021, 3:00 PM MDT
In force: 52 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Elbert County, CO

The radar

The Denver radar (KFTG), 63 km from the middle of the area, began a volume at 20:09 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 watch it was issued in

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

Issued	Product	Office	Lasted
Sep 14, 1:55 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.1 hours before the alert went out and 130 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: 17 J/kg
Mixed-layer CIN: -309 J/kg
Mixed-layer LCL: 1437 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 265 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

872 
WUUS55 KBOU 142008
SVRBOU
COC039-142100-
/O.NEW.KBOU.SV.W.0155.210914T2008Z-210914T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
208 PM MDT Tue Sep 14 2021

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  West central Elbert County in east central Colorado...

* Until 300 PM MDT.

* At 207 PM MDT, a severe thunderstorm was located 4 miles northwest
  of Elbert, or 28 miles north of Colorado Springs, moving east at 20
  mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees. Hail damage to 
           vehicles is expected.

* This severe thunderstorm will be near...
  Elbert around 220 PM MDT.

Other locations in the path of this severe thunderstorm include
Kiowa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 3913 10466 3934 10466 3936 10424 3913 10422
TIME...MOT...LOC 2007Z 267DEG 18KT 3926 10462 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RJK

2 follow-up statements

672 
WWUS55 KBOU 142025
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
225 PM MDT Tue Sep 14 2021

COC039-142100-
/O.CON.KBOU.SV.W.0155.000000T0000Z-210914T2100Z/
Elbert CO-
225 PM MDT Tue Sep 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM MDT
FOR WEST CENTRAL ELBERT COUNTY...

At 222 PM MDT, a severe thunderstorm was located near Elbert, or 30 
miles northeast of Colorado Springs, moving east at 20 mph.

There was a report of pea to marble sized hail 2 inches deep on 
Highway 83 & County Road 76, 5 miles northwest of the town of Elbert 
at 2:14 PM MDT. 

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Expect damage to roofs, siding, and trees. Hail damage to 
         vehicles is expected.

Locations impacted include...
  Kiowa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3913 10466 3934 10466 3936 10424 3913 10422
TIME...MOT...LOC 2022Z 267DEG 18KT 3926 10452 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RJK

241 
WWUS55 KBOU 142055
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
255 PM MDT Tue Sep 14 2021

COC039-142104-
/O.EXP.KBOU.SV.W.0155.000000T0000Z-210914T2100Z/
Elbert CO-
255 PM MDT Tue Sep 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL ELBERT COUNTY
WILL EXPIRE AT 300 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.

There was a report of pea to marble sized hail 2 inches deep on 
Highway 83 & County Road 76, 5 miles northwest of the town of Elbert 
at 2:14 PM MDT. 

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
east central Colorado.

LAT...LON 3913 10466 3934 10466 3936 10424 3913 10422
TIME...MOT...LOC 2054Z 267DEG 18KT 3927 10432 

$$

RJK

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 13, 7:08 PM MDT	Special Weather Statement	BOU	Elbert	37 min
Sep 13, 7:33 PM MDT	Special Weather Statement	BOU	Weld	42 min
Sep 13, 7:36 PM MDT	Special Weather Statement	BOU	Denver	39 min
Sep 13, 7:49 PM MDT	Special Weather Statement	BOU	Elbert	41 min
Sep 13, 9:31 PM MDT	Special Weather Statement	BOU	Weld	29 min
Sep 14, 1:52 PM MDT	Special Weather Statement	BOU	Douglas	38 min
Sep 14, 4:15 PM MDT	Special Weather Statement	BOU	Douglas	45 min
Sep 14, 4:24 PM MDT	Special Weather Statement	BOU	Lincoln	66 min
Sep 14, 5:00 PM MDT	Special Weather Statement	BOU	Washington	45 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.