Alert archive / Colorado / Tornado Warnings in 2011

Tornado Warning 31, NWS Denver/Boulder, CO

July 12, 2011Elbert County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 12, 2011, 7:45 PM MDT for Elbert County, Colorado. It was in force for 45 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: Jul 12, 2011, 7:45 PM MDT (01:45 UTC)
Expired: Jul 12, 2011, 8:30 PM MDT
In force: 45 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon

County Elbert County, CO

The radar

The Denver radar (KFTG), 58 km from the middle of the area, began a volume at 01:44 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
Jul 12, 8:11 PM MDT	TORNADO	Fondis, 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 00:00Z, 1.8 hours before the alert went out and 115 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: 596 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1449 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 256 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

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

375 
WFUS55 KBOU 130145
TORBOU
COC039-130230-
/O.NEW.KBOU.TO.W.0031.110713T0145Z-110713T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
745 PM MDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 830 PM MDT

* AT 745 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES EAST OF
  FONDIS...OR 35 MILES NORTHEAST OF COLORADO SPRINGS. THIS STORM WAS
  MOVING NORTHEAST AT 10 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FONDIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3938 10439 3931 10433 3932 10408 3915 10432
      3921 10453
TIME...MOT...LOC 0145Z 204DEG 9KT 3924 10434

$$
BARJENBRUCH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 6:34 PM MDT	Flash Flood Warning	BOU	Arapahoe, Elbert	2 hr
Jul 12, 6:39 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Elbert	51 min
Jul 12, 7:03 PM MDT	Tornado Warning	BOU	Elbert	42 min
Jul 12, 7:19 PM MDT	Flash Flood Warning	BOU	Arapahoe, Elbert	91 min
Jul 12, 7:23 PM MDT	Severe Thunderstorm Warning	BOU	Weld	52 min
Jul 12, 7:27 PM MDT	Tornado Warning	BOU	Elbert	48 min
Jul 12, 7:34 PM MDT	Tornado Warning	BOU	Weld	41 min
Jul 12, 7:48 PM MDT	Areal Flood Advisory	BOU	Weld	87 min
Jul 12, 8:05 PM MDT	Severe Thunderstorm Warning	BOU	Weld	40 min
Jul 12, 8:17 PM MDT	Tornado Warning	BOU	Elbert	43 min
Jul 12, 8:21 PM MDT	Severe Thunderstorm Warning	BOU	Weld	54 min
Jul 12, 8:33 PM MDT	Flash Flood Warning	BOU	Arapahoe, Elbert	3 hr
Jul 12, 8:44 PM MDT	Flash Flood Warning	BOU	Weld	2 hr
Jul 12, 9:00 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	60 min
Jul 12, 9:04 PM MDT	Severe Thunderstorm Warning	BOU	Weld	56 min
Jul 12, 9:10 PM MDT	Tornado Warning	BOU	Weld	34 min
Jul 12, 9:15 PM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe, Denver, Jefferson	90 min
Jul 12, 9:30 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Denver	44 min
Jul 12, 9:40 PM MDT	Areal Flood Advisory	BOU	Boulder	95 min
Jul 12, 9:59 PM MDT	Severe Thunderstorm Warning	BOU	Weld	61 min
Jul 12, 10:35 PM MDT	Areal Flood Advisory	BOU	Larimer, Weld	115 min
Jul 12, 10:48 PM MDT	Flash Flood Warning	BOU	Weld	3 hr
Jul 12, 10:54 PM MDT	Flash Flood Warning	BOU	Larimer	2 hr
Jul 12, 11:19 PM MDT	Areal Flood Warning	BOU	Arapahoe, Elbert	6 hr
Jul 13, 12:04 AM MDT	River Flood Advisory	BOU	Adams	10 hr
Jul 13, 12:16 AM MDT	Flash Flood Warning	BOU	Weld	3 hr
Jul 13, 12:32 AM MDT	River Flood Advisory	BOU	Weld	47 hr
Jul 13, 12:37 AM MDT	Areal Flood Advisory	BOU	Weld	83 min
Jul 13, 1:11 AM MDT	Areal Flood Advisory	BOU	Logan	94 min
Jul 13, 2:01 PM MDT	Special Weather Statement	BOU	Elbert	29 min
Jul 13, 2:22 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	38 min
Jul 13, 2:42 PM MDT	Areal Flood Advisory	BOU	Elbert	93 min
Jul 13, 2:58 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	38 min
Jul 13, 3:52 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	38 min
Jul 13, 4:22 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	16 min
Jul 13, 5:08 PM MDT	Special Weather Statement	BOU	Jefferson	52 min
Jul 13, 5:53 PM MDT	Areal Flood Advisory	BOU	Boulder	82 min
Jul 13, 5:56 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Denver, Douglas, Jefferson	49 min

Nearby

Tornado Warnings in Colorado, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.