Alert archive / Colorado / Tornado Warnings in 2014

Tornado Warning 74, NWS Denver/Boulder, CO

June 21, 2014Adams County, Arapahoe County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 21, 2014, 3:14 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 18 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 21, 2014, 3:14 PM MDT (21:14 UTC)
Expired
Jun 21, 2014, 3:32 PM MDT
In force
18 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Adams County, CO, Arapahoe County, CO

The radar

The Denver radar (KFTG), 11 km from the middle of the area, began a volume at 21:14 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 12:00Z, 9.2 hours before the alert went out and 103 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 2014-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 37 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 2014-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 square meters per square second.193958Sfc1 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
37 J/kg
Mixed-layer CIN
-319 J/kg
Mixed-layer LCL
2293 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-29 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

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

964 
WFUS55 KBOU 212114
TORBOU
COC001-005-212145-
/O.NEW.KBOU.TO.W.0074.140621T2114Z-140621T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
314 PM MDT SAT JUN 21 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL ARAPAHOE COUNTY IN NORTHEAST COLORADO...
  SOUTH CENTRAL ADAMS COUNTY IN NORTHEAST COLORADO...

* UNTIL 345 PM MDT
    
* AT 314 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR BENNETT...OR 26 MILES EAST OF DENVER...
  MOVING NORTHEAST AT 10 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...
  BENNETT...MANILA VILLAGE AND STRASBURG. 

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 3970 10449 3977 10454 3983 10448 3986 10433
      3977 10428 3969 10438
TIME...MOT...LOC 2114Z 238DEG 7KT 3976 10446 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

RJK
1 follow-up statement
394 
WWUS55 KBOU 212132
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
332 PM MDT SAT JUN 21 2014

COC001-005-212142-
/O.CAN.KBOU.TO.W.0074.000000T0000Z-140621T2145Z/
ARAPAHOE CO-ADAMS CO-
332 PM MDT SAT JUN 21 2014

...THE TORNADO WARNING FOR NORTH CENTRAL ARAPAHOE AND SOUTH CENTRAL
ADAMS COUNTIES IS CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 3970 10449 3977 10454 3983 10448 3986 10433
      3977 10428 3969 10438
TIME...MOT...LOC 2130Z 238DEG 7KT 3978 10442 

$$

RJK

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 11:33 PM MDTSpecial Weather StatementBOUWashington57 min
Jun 21, 12:31 AM MDTSpecial Weather StatementBOUWashington59 min
Jun 21, 2:41 PM MDTTornado WarningBOUAdams, Weld16 min
Jun 21, 2:47 PM MDTTornado WarningBOUAdams28 min
Jun 21, 3:43 PM MDTSevere Thunderstorm WarningBOUWeld27 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.