Alert archive / Colorado / Tornado Warnings in 2014

Tornado Warning 66, NWS Denver/Boulder, CO

June 18, 2014Logan County, Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 18, 2014, 7:41 PM MDT for Logan County, Washington County, Colorado. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 18, 2014, 7:41 PM MDT (01:41 UTC)
Expired
Jun 18, 2014, 8:15 PM MDT
In force
34 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.25 in

Counties Logan County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 137 km from the middle of the area, began a volume at 01:43 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.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 1.7 hours before the alert went out and 69 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.

931 
WFUS55 KBOU 190141
TORBOU
COC075-121-190215-
/O.NEW.KBOU.TO.W.0066.140619T0141Z-140619T0215Z/

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

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL WASHINGTON COUNTY IN NORTHEAST COLORADO...
  SOUTHWESTERN LOGAN COUNTY IN NORTHEAST COLORADO...

* UNTIL 815 PM MDT
    
* AT 741 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 6 MILES EAST OF PREWITT RESERVOIR...OR 15 MILES
  SOUTH OF STERLING...MOVING EAST AT 20 MPH.

  HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL. 

  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...
  STERLING...MERINO...ATWOOD AND PREWITT RESERVOIR. 

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 4068 10315 4053 10300 4036 10300 4029 10334
      4035 10346 4054 10347
TIME...MOT...LOC 0141Z 249DEG 16KT 4043 10324 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

BARJENBRUCH
1 follow-up statement
501 
WWUS55 KBOU 190157
SVSBOU

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

COC075-121-190215-
/O.CON.KBOU.TO.W.0066.000000T0000Z-140619T0215Z/
WASHINGTON CO-LOGAN CO-
757 PM MDT WED JUN 18 2014

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM MDT FOR NORTH
CENTRAL WASHINGTON AND SOUTH CENTRAL LOGAN COUNTIES...
    
AT 756 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 8 MILES SOUTHEAST OF ATWOOD...OR 13 MILES SOUTH OF
STERLING...MOVING EAST AT 20 MPH.

HAZARD...TORNADO AND GOLF BALL SIZE HAIL. 

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...
ATWOOD. 

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 4053 10300 4036 10300 4036 10316 4047 10325
      4054 10331 4064 10311
TIME...MOT...LOC 0156Z 249DEG 16KT 4045 10315 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

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, 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, 8:40 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.