Alert archive / Colorado / Tornado Warnings in 2014

Tornado Warning 69, NWS Denver/Boulder, CO

June 18, 2014Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 18, 2014, 8:40 PM MDT for Washington County, Colorado. It was in force for 35 min. 1 report 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 18, 2014, 8:40 PM MDT (02:40 UTC)
Expired
Jun 18, 2014, 9:15 PM MDT
In force
35 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Tornado
Observed
Hail
1.5 in

County Washington County, CO

The radar

The Goodland radar (KGLD), 149 km from the middle of the area, began a volume at 02:40 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 18, 8:48 PM MDTHAIL 1Burdett, CO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 2.7 hours before the alert went out and 59 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 00:00Z on 2014-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 382 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2014-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 143 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
382 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
2444 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
143 m²/s²
0-3 km storm-relative helicity
391 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

124 
WFUS55 KBOU 190240
TORBOU
COC121-190315-
/O.NEW.KBOU.TO.W.0069.140619T0240Z-140619T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
840 PM MDT WED JUN 18 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN WASHINGTON COUNTY IN NORTHEAST COLORADO...

* UNTIL 915 PM MDT

* AT 840 PM MDT...A CONFIRMED TORNADO WAS LOCATED 5 MILES SOUTHWEST
  OF BURDETT...OR 14 MILES NORTHEAST OF AKRON...MOVING EAST AT 45
  MPH.

  HAZARD...DAMAGING TORNADO AND PING PONG BALL SIZE HAIL. 

  SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* LOCATIONS IMPACTED INCLUDE...
  LONE STAR AND BURDETT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW! MOVE TO A
BASEMENT OR 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 4035 10279 4022 10280 4023 10308 4044 10315
      4044 10278
TIME...MOT...LOC 0240Z 267DEG 40KT 4029 10301 

TORNADO...OBSERVED
HAIL...1.50IN

$$

BARJENBRUCH
1 follow-up statement
865 
WWUS55 KBOU 190305
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
905 PM MDT WED JUN 18 2014

COC121-190314-
/O.CAN.KBOU.TO.W.0069.000000T0000Z-140619T0315Z/
WASHINGTON CO-
905 PM MDT WED JUN 18 2014

...THE TORNADO WARNING FOR NORTHEASTERN WASHINGTON COUNTY IS
CANCELLED...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4035 10279 4022 10280 4023 10308 4044 10315
      4044 10278
TIME...MOT...LOC 0304Z 267DEG 40KT 4030 10265 

$$

BARJENBRUCH

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 6:03 PM MDTSpecial Weather StatementBOUBroomfield27 min
Jun 18, 6:28 PM MDTSpecial Weather StatementBOUDenver32 min
Jun 18, 6:33 PM MDTSpecial Weather StatementBOUBroomfield27 min
Jun 18, 6:57 PM MDTSpecial Weather StatementBOUBroomfield, Denver33 min
Jun 18, 7:06 PM MDTSevere Thunderstorm WarningBOUAdams, Denver24 min
Jun 18, 7:18 PM MDTSevere Thunderstorm WarningBOUMorgan42 min
Jun 18, 7:29 PM MDTSevere Thunderstorm WarningBOULogan, Washington46 min
Jun 18, 7:33 PM MDTSpecial Weather StatementBOUAdams27 min
Jun 18, 7:41 PM MDTTornado WarningBOULogan, Washington34 min
Jun 18, 8:00 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington30 min
Jun 18, 8:10 PM MDTTornado WarningBOULogan, Phillips50 min
Jun 18, 8:17 PM MDTTornado WarningBOUWashington28 min
Jun 18, 8:48 PM MDTTornado WarningBOULogan, Phillips, Sedgwick27 min
Jun 18, 9:10 PM MDTTornado WarningBOUPhillips, Sedgwick35 min

Nearby

Tornado Warnings in Colorado, 2014Every tornado warning in 2014Tornadoes in 2014

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.