Alert archive / Colorado / Tornado Warnings in 2011

Tornado Warning 22, NWS Denver/Boulder, CO

June 19, 2011Sedgwick County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 19, 2011, 6:13 PM MDT for Sedgwick County, Colorado. It was in force for 32 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, 6:13 PM MDT (00:13 UTC)
Expired
Jun 19, 2011, 6:45 PM MDT
In force
32 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon

County Sedgwick County, CO

The radar

The Goodland radar (KGLD), 174 km from the middle of the area, began a volume at 00:16 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, 6:20 PM MDTHAIL 26 Se Julesburg, CO
Jun 19, 6:24 PM MDTHAIL 25 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.

IssuedProductOfficeLasted
Jun 19, 2:04 PM MDTTornado WatchSPC7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.2 hours before the alert went out and 140 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, N. Platte/Lee Bi, NE at 00:00Z on 2011-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1727 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2011-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 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
1727 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
1157 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
293 m²/s²
Significant tornado parameter
2.2
Supercell composite
17.6

Open this sounding in Storm Lab

The text

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

042 
WFUS55 KBOU 200013
TORBOU
COC115-200045-
/O.NEW.KBOU.TO.W.0022.110620T0013Z-110620T0045Z/

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

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN SEDGWICK COUNTY IN NORTHEAST COLORADO

* UNTIL 645 PM MDT

* AT 613 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 8 MILES NORTH OF
  SIXTEEN-MILE CORNER...OR 8 MILES SOUTH OF JULESBURG. THIS STORM WAS
  MOVING EAST AT 30 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SIXTEEN-MILE CORNER...OVID 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.

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING LARGE
DAMAGING HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

&&

LAT...LON 4075 10205 4075 10242 4100 10242 4100 10240
      4100 10204
TIME...MOT...LOC 0013Z 267DEG 27KT 4087 10224

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 6:28 PM MDTTornado WarningBOULogan, Phillips47 min
Jun 19, 6:44 PM MDTSevere Thunderstorm WarningBOULogan, Washington61 min
Jun 19, 6:58 PM MDTTornado WarningBOUPhillips47 min
Jun 19, 7:39 PM MDTSevere Thunderstorm WarningBOULogan, Washington27 min
Jun 19, 7:44 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld46 min
Jun 19, 7:59 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver21 min
Jun 19, 8:41 PM MDTSevere Thunderstorm WarningBOUPhillips34 min
Jun 19, 8:58 PM MDTSpecial Weather StatementBOUMorgan32 min
Jun 19, 9:18 PM MDTAreal Flood AdvisoryBOUMorgan87 min
Jun 19, 9:34 PM MDTAreal Flood AdvisoryBOUBoulder86 min
Jun 19, 9:38 PM MDTSpecial Weather StatementBOUMorgan37 min
Jun 19, 9:44 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington46 min
Jun 19, 10:29 PM MDTSevere Thunderstorm WarningBOUWashington31 min
Jun 19, 11:00 PM MDTAreal Flood AdvisoryBOUBoulder7 hr
Jun 19, 11:15 PM MDTSpecial Weather StatementBOUArapahoe30 min
Jun 20, 10:54 AM MDTRiver Flood AdvisoryBOUWeld10 days
Jun 20, 10:54 AM MDTRiver Flood AdvisoryBOUAdams7 hr
Jun 20, 10:54 AM MDTRiver Flood AdvisoryBOUWeld30 hr

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.