Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 63, NWS Denver/Boulder, CO

June 13, 2021Arapahoe County, Denver County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 13, 2021, 4:38 PM MDT for Arapahoe County, Denver County, Colorado. It was in force for 37 min. 13 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, 4:38 PM MDT (22:38 UTC)
Expired: Jun 13, 2021, 5:15 PM MDT
In force: 37 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

The radar

The Denver radar (KFTG), 27 km from the middle of the area, began a volume at 22:37 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, 4:41 PM MDT	HAIL 1	3 Wsw Aurora, CO
Jun 13, 4:47 PM MDT	HAIL 1	3 N Cherry Creek Reserv, CO
Jun 13, 4:48 PM MDT	HAIL 1	3 N Cherry Creek Reserv, CO
Jun 13, 4:55 PM MDT	HAIL 1.25	3 Wsw Aurora, CO	REPORT FROM MPING: HALF DOLLAR (1.25 IN.).
Jun 13, 5:00 PM MDT	HAIL 1.5	1 Nne Aurora, CO
Jun 13, 5:10 PM MDT	HAIL 1	3 N Cherry Creek Reserv, CO
Jun 13, 5:12 PM MDT	HAIL 1	3 Sw Aurora, CO	REPORT FROM MPING: QUARTER (1.00 IN.).
Jun 13, 5:12 PM MDT	HAIL 1.5	3 Wsw Aurora, CO
Jun 13, 5:14 PM MDT	HAIL 1.25	2 Ese Cherry Creek Rese, CO	DAMAGE TO VEHICLES AND TRAILERS REPORTED AT CHERRY CREEK STATE PARK. MINOR FLOODING REPORTED AS WELL.
Jun 13, 5:16 PM MDT	HAIL 1.5	3 Sw Aurora, CO	REPORT FROM MPING: PING PONG BALL (1.50 IN.).
Jun 13, 5:17 PM MDT	HAIL 1.25	3 Sw Aurora, CO	REPORT FROM MPING: HALF DOLLAR (1.25 IN.).
Jun 13, 5:19 PM MDT	HAIL 0.75	3 E Cherry Creek Reserv, CO	REPORT FROM MPING: DIME (0.75 IN.).
Jun 13, 5:20 PM MDT	HAIL 1.5	2 Nne Cherry Creek Rese, 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, 10.6 hours before the alert went out and 139 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

905 
WUUS55 KBOU 132238
SVRBOU
COC005-031-132315-
/O.NEW.KBOU.SV.W.0063.210613T2238Z-210613T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
438 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...
  South central Denver County in northeastern Colorado...

* Until 515 PM MDT.

* At 438 PM MDT, a severe thunderstorm was located over southeastern
  Denver, moving southeast at 10 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Denver, Aurora, eastern Centennial, Greenwood Village and Buckley
  AFB.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3969 10499 3978 10489 3977 10484 3977 10485
      3975 10485 3975 10488 3974 10488 3974 10473
      3971 10460 3956 10481 3957 10487
TIME...MOT...LOC 2238Z 309DEG 10KT 3970 10490 

HAIL...1.00IN
WIND...<50MPH
 
$$

SCHLATTER

1 follow-up statement

729 
WWUS55 KBOU 132248
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
448 PM MDT Sun Jun 13 2021

COC005-031-132315-
/O.CON.KBOU.SV.W.0063.000000T0000Z-210613T2315Z/
Arapahoe CO-Denver CO-
448 PM MDT Sun Jun 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MDT
FOR WESTERN ARAPAHOE AND SOUTH CENTRAL DENVER COUNTIES...

At 448 PM MDT, a severe thunderstorm was located over western Aurora,
or 6 miles southeast of Denver, moving southeast at 15 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...Expect damage to roofs, siding, and trees. People and 
         animals outdoors will be injured. Expect hail damage to 
         roofs, siding, windows, and vehicles.

Locations impacted include...
Denver, Aurora, eastern Centennial, Greenwood Village and Buckley
AFB.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3966 10495 3978 10489 3977 10484 3977 10485
      3975 10485 3975 10488 3974 10488 3974 10473
      3971 10460 3956 10481 3957 10487
TIME...MOT...LOC 2248Z 307DEG 14KT 3967 10485 

HAIL...1.50IN
WIND...60MPH
 
$$

SCHLATTER

The 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, 4:59 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, 5:45 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, 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.