Alert archive / Colorado / Tornado Warnings in 2015

Tornado Warning 22, NWS Denver/Boulder, CO

June 4, 2015Elbert County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 4, 2015, 5:05 PM MDT for Elbert County, Colorado. It was in force for 25 min. 4 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 4, 2015, 5:05 PM MDT (23:05 UTC)
Expired: Jun 4, 2015, 5:30 PM MDT
In force: 25 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

County Elbert County, CO

The radar

The Pueblo radar (KPUX), 79 km from the middle of the area, began a volume at 23:06 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 4, 5:15 PM MDT	TORNADO	1 N Simla, CO	MULTIPLE REPORTS OF A TORNADO ON THE GROUND.
Jun 4, 5:18 PM MDT	TORNADO	1 N Simla, CO	THE SAME TORNADO TOUCHED DOWN FOR A SECOND TIME.
Jun 4, 5:31 PM MDT	TORNADO	2 Wnw Simla, CO	LARGE TORNADO ON THE GROUND.
Jun 4, 5:40 PM MDT	HAIL 2.75	1 W Simla, CO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 4, 2:20 PM MDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 11.1 hours before the alert went out and 109 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: 1510 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 900 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

223 
WFUS55 KBOU 042305
TORBOU
COC039-042330-
/O.NEW.KBOU.TO.W.0022.150604T2305Z-150604T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
505 PM MDT THU JUN 4 2015

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN ELBERT COUNTY IN EAST CENTRAL COLORADO...

* UNTIL 530 PM MDT
    
* AT 504 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR SIMLA...OR 24 MILES WEST OF LIMON...MOVING
  SOUTH AT 10 MPH.

  HAZARD...TORNADO AND GOLF BALL SIZE HAIL. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* LOCATIONS IMPACTED INCLUDE...
  SIMLA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE
HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3913 10417 3921 10418 3922 10401 3913 10403
TIME...MOT...LOC 2304Z 346DEG 9KT 3917 10412 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

RPK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 6:02 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Douglas, Elbert	43 min
Jun 3, 6:29 PM MDT	Severe Thunderstorm Warning	BOU	Clear Creek, Jefferson	46 min
Jun 3, 6:41 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	64 min
Jun 3, 7:16 PM MDT	Special Weather Statement	BOU	Denver	44 min
Jun 3, 7:18 PM MDT	Severe Thunderstorm Warning	BOU	Boulder, Larimer, Weld	15 min
Jun 3, 7:45 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	45 min
Jun 3, 7:46 PM MDT	Special Weather Statement	BOU	Elbert	44 min
Jun 3, 7:58 PM MDT	Severe Thunderstorm Warning	BOU	Weld	32 min
Jun 3, 8:13 PM MDT	Severe Thunderstorm Warning	BOU	Larimer	32 min
Jun 3, 8:29 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	61 min
Jun 3, 8:33 PM MDT	Areal Flood Advisory	BOU	Arapahoe	117 min
Jun 3, 9:15 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	34 min
Jun 3, 10:43 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	47 min
Jun 3, 11:16 PM MDT	Special Weather Statement	BOU	Weld	44 min
Jun 3, 11:29 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	46 min
Jun 3, 11:48 PM MDT	Severe Thunderstorm Warning	BOU	Weld	27 min
Jun 4, 12:01 AM MDT	Severe Thunderstorm Warning	BOU	Weld	44 min
Jun 4, 2:24 PM MDT	Special Weather Statement	BOU	Elbert	51 min
Jun 4, 3:46 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	29 min
Jun 4, 4:28 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Denver	24 min
Jun 4, 4:47 PM MDT	Tornado Warning	BOU	Adams	13 min
Jun 4, 4:48 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	27 min
Jun 4, 5:03 PM MDT	Severe Thunderstorm Warning	BOU	Adams	27 min
Jun 4, 5:16 PM MDT	Tornado Warning Tornado observed	BOU	Elbert	29 min
Jun 4, 5:49 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	26 min
Jun 4, 5:54 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	51 min
Jun 4, 5:58 PM MDT	Tornado Warning	BOU	Elbert	32 min

Nearby

Tornado Warnings in Colorado, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.