Alert archive / Colorado / Tornado Warnings in 2011
Tornado Warning 21, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 19, 2011, 5:42 PM MDT for Sedgwick County, Colorado. It was in force for 33 min. 5 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, 5:42 PM MDT (23:42 UTC)
- Expired
- Jun 19, 2011, 6:15 PM MDT
- In force
- 33 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Sedgwick County, CO
The radar
The North Platte radar (KLNX), 184 km from the middle of the area, began a volume at 23:42 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, 6:01 PM MDT | TORNADO | 5 W Ovid, CO | TORNADO ON THE GROUND FOR 2 MINUTES IN OPEN FIELD. NO DAMAGE REPORTED. |
| Jun 19, 6:08 PM MDT | HAIL 1.75 | Ovid, CO | |
| Jun 19, 6:17 PM MDT | HAIL 1.25 | 6 Se Sedgwick, CO | |
| Jun 19, 6:20 PM MDT | HAIL 2 | 6 Se Julesburg, CO | |
| Jun 19, 6:24 PM MDT | HAIL 2 | 5 Se Julesburg, 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, 11.7 hours before the alert went out and 143 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
331
WFUS55 KBOU 192342
TORBOU
COC115-200015-
/O.NEW.KBOU.TO.W.0021.110619T2342Z-110620T0015Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
542 PM MDT SUN JUN 19 2011
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* TORNADO WARNING FOR...
SEDGWICK COUNTY IN NORTHEAST COLORADO
* UNTIL 615 PM MDT
* AT 542 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES WEST OF
MARKS BUTTE...OR 21 MILES SOUTHWEST OF JULESBURG. THIS STORM WAS
MOVING EAST AT 25 MPH.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SIXTEEN-MILE CORNER...SEDGWICK...OVID...MARKS BUTTE AND JULESBURG.
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 4100 10204 4076 10205 4075 10265 4100 10265
4100 10264 4101 10263 4100 10240 4101 10240
4100 10210 4100 10205
TIME...MOT...LOC 2342Z 272DEG 24KT 4082 10255
$$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, 5:04 PM MDT | Tornado Warning | BOU | Logan | 26 min |
| Jun 19, 5:19 PM MDT | Tornado Warning | BOU | Logan, Sedgwick | 26 min |
| Jun 19, 5:48 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 57 min |
Nearby
Tornado Warnings in Colorado, 2011Every tornado warning in 2011Tornadoes 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.