Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 119, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 12, 2021, 7:49 PM MDT for Elbert County, Colorado. It was in force for 26 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
- Aug 12, 2021, 7:49 PM MDT (01:49 UTC)
- Expired
- Aug 12, 2021, 8:15 PM MDT
- In force
- 26 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), 78 km from the middle of the area, began a volume at 01:53 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
Denver, CO (KDNR), launched 00:00Z, 1.8 hours before the alert went out and 74 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
- 616 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 2322 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
486
WUUS55 KBOU 130149
SVRBOU
COC039-130215-
/O.NEW.KBOU.SV.W.0119.210813T0149Z-210813T0215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
749 PM MDT Thu Aug 12 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
East central Elbert County in east central Colorado...
* Until 815 PM MDT.
* At 748 PM MDT, a severe thunderstorm was located 8 miles southeast
of Agate, or 10 miles northwest of Limon, moving southwest at 5
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 remain over mainly rural areas of
east central Elbert County, including the following locations...
Cedar Point.
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 3938 10373 3928 10387 3937 10393 3948 10378
TIME...MOT...LOC 0148Z 040DEG 3KT 3938 10383
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BARJENBRUCH1 follow-up statement
943
WWUS55 KBOU 130211
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
811 PM MDT Thu Aug 12 2021
COC039-130221-
/O.EXP.KBOU.SV.W.0119.000000T0000Z-210813T0215Z/
Elbert CO-
811 PM MDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ELBERT COUNTY
WILL EXPIRE AT 815 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However heavy
rain and minor flooding of low lying areas can be expected with this
thunderstorm.
LAT...LON 3938 10373 3928 10387 3937 10393 3948 10378
TIME...MOT...LOC 0211Z 040DEG 3KT 3937 10384
$$
BARJENBRUCHThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 6:10 PM MDT | Special Weather Statement | BOU | Elbert | 50 min |
| Aug 12, 7:01 PM MDT | Special Weather Statement | BOU | Elbert | 29 min |
| Aug 12, 10:51 PM MDT | Areal Flood Advisory | BOU | Washington | 84 min |
| Aug 12, 11:09 PM MDT | Special Weather Statement | BOU | Douglas | 36 min |
| Aug 12, 11:21 PM MDT | Areal Flood Advisory | BOU | Douglas | 20 min |
| Aug 12, 11:41 PM MDT | Flash Flood Warning | BOU | Douglas | 94 min |
| Aug 13, 12:38 AM MDT | Areal Flood Advisory | BOU | Douglas, Jefferson | 82 min |
| Aug 13, 1:20 PM MDT | Areal Flood Advisory | BOU | Grand | 85 min |
| Aug 13, 1:42 PM MDT | Areal Flood Advisory | BOU | Grand | 2 hr |
| Aug 13, 2:27 PM MDT | Flash Flood Warning | BOU | Grand | 2 hr |
| Aug 13, 3:36 PM MDT | Areal Flood Advisory | BOU | Grand | 69 min |
| Aug 13, 3:53 PM MDT | Areal Flood Advisory | BOU | Larimer | 2 hr |
| Aug 13, 5:39 PM MDT | Flash Flood Warning | BOU | Grand | 2 hr |
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.