Alert archive / Colorado / Tornado Warnings in 2011
Tornado Warning 20, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 19, 2011, 5:19 PM MDT for Logan County, Sedgwick County, Colorado. It was in force for 26 min. 3 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, 5:19 PM MDT (23:19 UTC)
- Expired
- Jun 19, 2011, 5:45 PM MDT
- In force
- 26 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
Counties Logan County, CO, Sedgwick County, CO
The radar
The Cheyenne radar (KCYS), 181 km from the middle of the area, began a volume at 23:21 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 | |
| Jun 19, 5:38 PM MDT | HAIL 1.25 | 8 Ene 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, 11.3 hours before the alert went out and 130 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.
189
WFUS55 KBOU 192319
TORBOU
COC075-115-192345-
/O.NEW.KBOU.TO.W.0020.110619T2319Z-110619T2345Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
519 PM MDT SUN JUN 19 2011
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* TORNADO WARNING FOR...
WESTERN SEDGWICK COUNTY IN NORTHEAST COLORADO
NORTHEASTERN LOGAN COUNTY IN NORTHEAST COLORADO
* UNTIL 545 PM MDT
* AT 519 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 3 MILES
SOUTHEAST OF CROOK...OR 27 MILES NORTHEAST OF STERLING. THIS STORM
WAS MOVING EAST AT 20 MPH.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TWIN
BUTTES...SEDGWICK...MARKS BUTTE 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 4100 10254 4100 10244 4075 10243 4075 10289
4101 10290 4101 10284 4100 10284 4100 10264
4100 10263 4100 10255
TIME...MOT...LOC 2319Z 272DEG 24KT 4083 10275
$$1 follow-up statement
827
WWUS55 KBOU 192334
SVSBOU
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
534 PM MDT SUN JUN 19 2011
COC075-115-192345-
/O.CON.KBOU.TO.W.0020.000000T0000Z-110619T2345Z/
SEDGWICK CO-LOGAN CO-
534 PM MDT SUN JUN 19 2011
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM MDT FOR
NORTHEASTERN LOGAN AND WESTERN SEDGWICK COUNTIES...
AT 533 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS STORM WAS
LOCATED 7 MILES WEST OF MARKS BUTTE...OR 22 MILES SOUTHWEST OF
JULESBURG. THIS STORM WAS MOVING EAST AT 20 MPH.
LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
TWIN BUTTES...SEDGWICK...MARKS BUTTE AND CROOK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM MDT SUNDAY EVENING FOR
NORTHEASTERN COLORADO.
&&
LAT...LON 4100 10254 4100 10244 4075 10243 4075 10289
4101 10290 4101 10284 4100 10284 4100 10264
4100 10263 4100 10255
TIME...MOT...LOC 2333Z 270DEG 25KT 4083 10261
$$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, 5:42 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, 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.