Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 64, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 13, 2021, 4:59 PM MDT for Adams County, Arapahoe County, Denver County, Colorado. It was in force for 31 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
- Jun 13, 2021, 4:59 PM MDT (22:59 UTC)
- Expired
- Jun 13, 2021, 5:30 PM MDT
- In force
- 31 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Adams County, CO, Arapahoe County, CO, Denver County, CO
The radar
The Denver radar (KFTG), 20 km from the middle of the area, began a volume at 23:00 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 |
|---|---|---|---|
| Jun 13, 5:00 PM MDT | HAIL 1.5 | 1 Nne Aurora, 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, 11.0 hours before the alert went out and 131 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.
393
WUUS55 KBOU 132259
SVRBOU
COC001-005-031-132330-
/O.NEW.KBOU.SV.W.0064.210613T2259Z-210613T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
459 PM MDT Sun Jun 13 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Western Arapahoe County in northeastern Colorado...
East central Denver County in northeastern Colorado...
Southwestern Adams County in northeastern Colorado...
* Until 530 PM MDT.
* At 458 PM MDT, a severe thunderstorm was located over northwestern
Aurora, or 7 miles east of Denver, moving east at 15 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.
* Locations impacted include...
Northeastern Denver, Aurora, Arapahoe Park and Buckley AFB.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3965 10484 3978 10485 3983 10461 3960 10460
TIME...MOT...LOC 2258Z 266DEG 12KT 3974 10480
HAIL...1.00IN
WIND...60MPH
$$
SCHLATTER2 follow-up statements
270
WWUS55 KBOU 132315
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
515 PM MDT Sun Jun 13 2021
COC031-132325-
/O.CAN.KBOU.SV.W.0064.000000T0000Z-210613T2330Z/
Denver CO-
515 PM MDT Sun Jun 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL DENVER COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3968 10482 3977 10482 3978 10477 3977 10477
3977 10474 3980 10474 3982 10467 3981 10466
3982 10465 3983 10461 3966 10467
TIME...MOT...LOC 2315Z 266DEG 12KT 3974 10472
$$
COC001-005-132330-
/O.CON.KBOU.SV.W.0064.000000T0000Z-210613T2330Z/
Arapahoe CO-Adams CO-
515 PM MDT Sun Jun 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR NORTHWESTERN ARAPAHOE AND SOUTH CENTRAL ADAMS COUNTIES...
At 515 PM MDT, a severe thunderstorm was located over northwestern
Aurora, or 11 miles east of Denver, moving east at 15 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Aurora and Buckley AFB.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3968 10482 3977 10482 3978 10477 3977 10477
3977 10474 3980 10474 3982 10467 3981 10466
3982 10465 3983 10461 3966 10467
TIME...MOT...LOC 2315Z 266DEG 12KT 3974 10472
HAIL...1.00IN
WIND...<50MPH
$$
SCHLATTER941
WWUS55 KBOU 132323
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
523 PM MDT Sun Jun 13 2021
COC001-005-132332-
/O.EXP.KBOU.SV.W.0064.000000T0000Z-210613T2330Z/
Arapahoe CO-Adams CO-
523 PM MDT Sun Jun 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ARAPAHOE AND
SOUTH CENTRAL ADAMS COUNTIES WILL EXPIRE AT 530 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. there is still a
severe thunderstorm warning in effect for Western Arapahoe County
until 5:30 PM.
LAT...LON 3968 10482 3977 10482 3978 10477 3977 10477
3977 10474 3980 10474 3982 10467 3981 10466
3982 10465 3983 10461 3966 10467
TIME...MOT...LOC 2322Z 266DEG 12KT 3974 10472
$$
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, 5:14 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver | 31 min |
| Jun 13, 5:45 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver, Douglas | 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.