Alert archive / Colorado / Tornado Warnings in 2011

Tornado Warning 18, NWS Denver/Boulder, CO

June 18, 2011Lincoln County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 18, 2011, 2:46 PM MDT for Lincoln County, Colorado. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 18, 2011, 2:46 PM MDT (20:46 UTC)
Expired: Jun 18, 2011, 3:15 PM MDT
In force: 29 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon

County Lincoln County, CO

The radar

The Pueblo radar (KPUX), 107 km from the middle of the area, began a volume at 20:49 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.

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 18, 12:31 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.8 hours before the alert went out and 81 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: 110 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 1171 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

005 
WFUS55 KBOU 182046
TORBOU
COC073-182115-
/O.NEW.KBOU.TO.W.0018.110618T2046Z-110618T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
246 PM MDT SAT JUN 18 2011

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL LINCOLN COUNTY IN EAST CENTRAL COLORADO

* UNTIL 315 PM MDT

* AT 246 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR HUGO...OR
  15 MILES SOUTHEAST OF LIMON. THIS STORM WAS MOVING EAST AT 20 MPH.

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

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 3921 10316 3902 10317 3905 10351 3921 10352
TIME...MOT...LOC 2046Z 284DEG 19KT 3915 10346

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 6:03 PM MDT	Special Weather Statement	BOU	Lincoln	27 min
Jun 18, 12:14 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	46 min
Jun 18, 12:32 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Washington	43 min
Jun 18, 12:57 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Elbert	48 min
Jun 18, 1:20 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Washington	40 min
Jun 18, 1:37 PM MDT	Tornado Warning	BOU	Elbert, Lincoln	36 min
Jun 18, 1:39 PM MDT	Severe Thunderstorm Warning	BOU	Washington	66 min
Jun 18, 2:08 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	52 min
Jun 18, 2:27 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	48 min
Jun 18, 3:15 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	30 min
Jun 18, 5:25 PM MDT	Special Weather Statement	BOU	Logan, Phillips, Sedgwick	65 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.