Alert archive / Colorado / Tornado Warnings in 2011

Tornado Warning 19, NWS Denver/Boulder, CO

June 19, 2011Logan County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 19, 2011, 5:04 PM MDT for Logan County, Colorado. It was in force for 26 min. 2 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 19, 2011, 5:04 PM MDT (23:04 UTC)
Expired: Jun 19, 2011, 5:30 PM MDT
In force: 26 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 167 km from the middle of the area, began a volume at 23:07 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 19, 5:23 PM MDT	HAIL 0.88	Crook, CO
Jun 19, 5:28 PM MDT	HAIL 2.5	Crook, 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 19, 2:04 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.1 hours before the alert went out and 111 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: 330 J/kg
Mixed-layer CIN: -236 J/kg
Mixed-layer LCL: 1573 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

692 
WFUS55 KBOU 192304
TORBOU
COC075-192330-
/O.NEW.KBOU.TO.W.0019.110619T2304Z-110619T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
504 PM MDT SUN JUN 19 2011

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL LOGAN COUNTY IN NORTHEAST COLORADO

* UNTIL 530 PM MDT

* AT 504 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 3 MILES NORTH OF
  PROCTOR...OR 20 MILES NORTHEAST OF STERLING. THIS STORM WAS MOVING
  EAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PROCTOR AND
  CROOK.

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 4090 10299 4090 10265 4072 10266 4073 10305
TIME...MOT...LOC 2304Z 200DEG 14KT 4085 10294

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 4:47 AM MDT	Special Weather Statement	BOU	Weld	43 min
Jun 19, 6:41 AM MDT	Special Weather Statement	BOU	Phillips, Sedgwick	34 min
Jun 19, 11:01 AM MDT	River Flood Watch	BOU	Jackson	24 hr
Jun 19, 11:42 AM MDT	Winter Weather Advisory	BOU	Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more	23 hr
Jun 19, 12:31 PM MDT	Severe Thunderstorm Warning	BOU	Weld	29 min
Jun 19, 2:42 PM MDT	Severe Thunderstorm Warning	BOU	Weld	36 min
Jun 19, 2:45 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	32 min
Jun 19, 3:40 PM MDT	Severe Thunderstorm Warning	BOU	Weld	24 min
Jun 19, 3:47 PM MDT	Severe Thunderstorm Warning	BOU	Weld	43 min
Jun 19, 4:22 PM MDT	Severe Thunderstorm Warning	BOU	Logan	23 min
Jun 19, 4:41 PM MDT	Severe Thunderstorm Warning	BOU	Logan	34 min
Jun 19, 5:19 PM MDT	Tornado Warning	BOU	Logan, Sedgwick	26 min
Jun 19, 5:42 PM MDT	Tornado Warning	BOU	Sedgwick	33 min
Jun 19, 5:48 PM MDT	Severe Thunderstorm Warning	BOU	Logan	57 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.