Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 66, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 13, 2021, 5:45 PM MDT for Arapahoe County, Denver County, Douglas County, Colorado. It was in force for 31 min. 3 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
- Jun 13, 2021, 5:45 PM MDT (23:45 UTC)
- Expired
- Jun 13, 2021, 6:16 PM MDT
- In force
- 31 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Arapahoe County, CO, Denver County, CO, Douglas County, CO
The radar
The Denver radar (KFTG), 43 km from the middle of the area, began a volume at 23:48 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 |
|---|---|---|---|
| Jun 13, 5:45 PM MDT | HAIL 1 | 2 Nne Cherry Hills Vill, CO | |
| Jun 13, 5:55 PM MDT | HAIL 1 | 3 Nne Englewood, CO | |
| Jun 13, 5:57 PM MDT | HAIL 1 | 2 N Englewood, CO |
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, 11.8 hours before the alert went out and 153 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
- 827 J/kg
- Mixed-layer CIN
- -387 J/kg
- Mixed-layer LCL
- 1858 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
608
WUUS55 KBOU 132345
SVRBOU
COC005-031-035-140030-
/O.NEW.KBOU.SV.W.0066.210613T2345Z-210614T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
545 PM MDT Sun Jun 13 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
North central Douglas County in northeastern Colorado...
Western Arapahoe County in northeastern Colorado...
Southwestern Denver County in northeastern Colorado...
* Until 630 PM MDT.
* At 545 PM MDT, a severe thunderstorm was located over southeastern
Englewood, or 6 miles south of Denver, moving east at 15 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Denver, southwestern Aurora, Centennial, northern Highlands Ranch,
Littleton, Englewood, Greenwood Village, Lone Tree, Sheridan and
Buckley AFB.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3955 10506 3956 10506 3956 10505 3962 10506
3973 10505 3971 10474 3954 10484
TIME...MOT...LOC 2345Z 266DEG 13KT 3964 10499
HAIL...1.00IN
WIND...<50MPH
$$
SCHLATTER2 follow-up statements
632
WWUS55 KBOU 140002
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
602 PM MDT Sun Jun 13 2021
COC005-031-035-140030-
/O.CON.KBOU.SV.W.0066.000000T0000Z-210614T0030Z/
Douglas CO-Arapahoe CO-Denver CO-
602 PM MDT Sun Jun 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM MDT
FOR NORTH CENTRAL DOUGLAS...WESTERN ARAPAHOE AND SOUTH CENTRAL DENVER
COUNTIES...
At 602 PM MDT, a severe thunderstorm was located over southern
Denver, moving east at 15 mph.
HAZARD...Quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Denver, southwestern Aurora, Centennial, northern Highlands Ranch,
Littleton, Englewood, Greenwood Village, Lone Tree, Sheridan and
Buckley AFB.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3955 10506 3956 10505 3957 10505 3972 10497
3971 10474 3954 10484
TIME...MOT...LOC 0002Z 261DEG 14KT 3967 10491
HAIL...1.00IN
WIND...<50MPH
$$
SCHLATTER535
WWUS55 KBOU 140016
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
616 PM MDT Sun Jun 13 2021
COC005-031-035-140026-
/O.CAN.KBOU.SV.W.0066.000000T0000Z-210614T0030Z/
Douglas CO-Arapahoe CO-Denver CO-
616 PM MDT Sun Jun 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL DOUGLAS...
WESTERN ARAPAHOE AND SOUTH CENTRAL DENVER COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled. However small hail is still possible with this
thunderstorm.
LAT...LON 3955 10506 3956 10505 3957 10505 3972 10497
3971 10474 3954 10484
TIME...MOT...LOC 0013Z 266DEG 13KT 3967 10484
$$
SCHLATTERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 13, 4:02 PM MDT | Special Weather Statement | BOU | Douglas | 43 min |
| Jun 13, 4:27 PM MDT | Special Weather Statement | BOU | Denver | 33 min |
| Jun 13, 4:38 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver | 37 min |
| Jun 13, 4:59 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 31 min |
| Jun 13, 5:14 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver | 31 min |
| Jun 13, 5:54 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 51 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.