Alert archive / Colorado / Tornado Warnings in 2014

Tornado Warning 68, NWS Denver/Boulder, CO

June 18, 2014Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 18, 2014, 8:17 PM MDT for Washington County, Colorado. It was in force for 28 min. 6 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 18, 2014, 8:17 PM MDT (02:17 UTC)
Expired
Jun 18, 2014, 8:45 PM MDT
In force
28 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

County Washington County, CO

The radar

The Denver radar (KFTG), 139 km from the middle of the area, began a volume at 02:21 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 18, 8:26 PM MDTTORNADO10 N Platner, COTORNADO ON GROUND
Jun 18, 8:26 PM MDTTORNADO10 N Platner, COTORNADO ON GROUND
Jun 18, 8:30 PM MDTTSTM WND DMG5 Ne Akron, COLARGE BARN SIGNIFICANTLY DAMAGED. SIDE OF BARN AND ALUMINUM ROOF REMOVED.
Jun 18, 8:36 PM MDTTORNADO5 N Platner, COTOUCHDOWN IN OPEN FIELD WITH NO DAMAGE REPORTED
Jun 18, 8:36 PM MDTTORNADOLone Star, COTOUCHDOWN IN OPEN FIELD WITH NO DAMAGE REPORTED
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, 2.3 hours before the alert went out and 51 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°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.

197 
WFUS55 KBOU 190217
TORBOU
COC121-190245-
/O.NEW.KBOU.TO.W.0068.140619T0217Z-140619T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
817 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 845 PM MDT
    
* AT 817 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR MIDWAY...OR 10 MILES NORTHWEST OF AKRON...
  MOVING EAST AT 30 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  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...
  AKRON...LONE STAR...PREWITT RESERVOIR...MIDWAY AND BURDETT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4019 10281 4015 10343 4043 10345 4044 10309
      4044 10278
TIME...MOT...LOC 0217Z 251DEG 27KT 4026 10335 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

BARJENBRUCH
1 follow-up statement
603 
WWUS55 KBOU 190231
SVSBOU

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

COC121-190245-
/O.CON.KBOU.TO.W.0068.000000T0000Z-140619T0245Z/
WASHINGTON CO-
831 PM MDT WED JUN 18 2014

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM MDT FOR
NORTHEASTERN WASHINGTON COUNTY...
    
AT 830 PM MDT...A CONFIRMED TORNADO WAS LOCATED ABOUT 10 MILES NORTH 
OF PLATNER...OR ABOUT 15 MILES NORTHEAST OF AKRON...MOVING EAST AT 
30 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 4019 10281 4019 10319 4043 10334 4044 10309
      4044 10278
TIME...MOT...LOC 0230Z 251DEG 27KT 4029 10322 

TORNADO...OBSERVED
HAIL...1.50IN

$$

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, 8:40 PM MDTTornado Warning Tornado observedBOUWashington35 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.