Alert archive / Colorado / Tornado Warnings in 2011

Tornado Warning 20, NWS Denver/Boulder, CO

June 19, 2011Logan County, Sedgwick County, Colorado

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

TimeReportWhereRemark
Jun 19, 5:23 PM MDTHAIL 0.88Crook, CO
Jun 19, 5:28 PM MDTHAIL 2.5Crook, CO
Jun 19, 5:38 PM MDTHAIL 1.258 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.

IssuedProductOfficeLasted
Jun 19, 2:04 PM MDTTornado WatchSPC7 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.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2011-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 330 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2011-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

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.

IssuedProductOfficeCountiesLasted
Jun 19, 4:47 AM MDTSpecial Weather StatementBOUWeld43 min
Jun 19, 6:41 AM MDTSpecial Weather StatementBOUPhillips, Sedgwick34 min
Jun 19, 11:01 AM MDTRiver Flood WatchBOUJackson24 hr
Jun 19, 11:42 AM MDTWinter Weather AdvisoryBOUBoulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more23 hr
Jun 19, 12:31 PM MDTSevere Thunderstorm WarningBOUWeld29 min
Jun 19, 2:42 PM MDTSevere Thunderstorm WarningBOUWeld36 min
Jun 19, 2:45 PM MDTSevere Thunderstorm WarningBOUAdams, Weld32 min
Jun 19, 3:40 PM MDTSevere Thunderstorm WarningBOUWeld24 min
Jun 19, 3:47 PM MDTSevere Thunderstorm WarningBOUWeld43 min
Jun 19, 4:22 PM MDTSevere Thunderstorm WarningBOULogan23 min
Jun 19, 4:41 PM MDTSevere Thunderstorm WarningBOULogan34 min
Jun 19, 5:04 PM MDTTornado WarningBOULogan26 min
Jun 19, 5:42 PM MDTTornado WarningBOUSedgwick33 min
Jun 19, 5:48 PM MDTSevere Thunderstorm WarningBOULogan57 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.