Alert archive / Colorado / Tornado Warnings in 2014

Tornado Warning 83, NWS Denver/Boulder, CO

September 29, 2014Arapahoe County, Elbert County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Sep 29, 2014, 3:13 PM MDT for Arapahoe County, Elbert County, Colorado. It was in force for 32 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
Sep 29, 2014, 3:13 PM MDT (21:13 UTC)
Expired
Sep 29, 2014, 3:45 PM MDT
In force
32 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.25 in

Counties Arapahoe County, CO, Elbert County, CO

The radar

The Denver radar (KFTG), 28 km from the middle of the area, began a volume at 21:13 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 29, 2:01 PM MDTTornado WatchSPC7 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 9.2 hours before the alert went out and 115 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 2014-09-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2014-09-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -55 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
772 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-55 m²/s²
0-3 km storm-relative helicity
-16 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.

389 
WFUS55 KBOU 292113
TORBOU
COC005-039-292145-
/O.NEW.KBOU.TO.W.0083.140929T2113Z-140929T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
313 PM MDT MON SEP 29 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL ARAPAHOE COUNTY IN NORTHEASTERN COLORADO...
  NORTHWESTERN ELBERT COUNTY IN EAST CENTRAL COLORADO...

* UNTIL 345 PM MDT
    
* AT 313 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 9 MILES NORTHEAST OF PONDEROSA PARK...OR 27
  MILES SOUTHEAST OF DENVER...MOVING NORTHEAST 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. 

* THIS TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  CENTRAL ARAPAHOE AND NORTHWESTERN ELBERT COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING ISSUED
FOR THE SAME AREA.

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE
HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3946 10457 3953 10459 3972 10449 3957 10429
      3946 10450
TIME...MOT...LOC 2113Z 232DEG 16KT 3950 10454 

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

$$

GIMMESTAD
1 follow-up statement
634 
WWUS55 KBOU 292149
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
349 PM MDT MON SEP 29 2014

COC005-039-292159-
/O.EXP.KBOU.TO.W.0083.000000T0000Z-140929T2145Z/
ARAPAHOE CO-ELBERT CO-
349 PM MDT MON SEP 29 2014

...THE TORNADO WARNING FOR CENTRAL ARAPAHOE AND NORTHWESTERN ELBERT
COUNTIES HAS EXPIRED...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 3946 10457 3953 10459 3972 10449 3957 10429
      3946 10450
TIME...MOT...LOC 2148Z 232DEG 16KT 3950 10454 

$$

GIMMESTAD

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 29, 2:04 PM MDTSevere Thunderstorm WarningBOUArapahoe, Douglas41 min
Sep 29, 2:39 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver66 min
Sep 29, 2:56 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert64 min
Sep 29, 3:06 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln39 min
Sep 29, 3:12 PM MDTSpecial Weather StatementBOUWashington48 min
Sep 29, 3:22 PM MDTSpecial Weather StatementBOUAdams53 min
Sep 29, 3:26 PM MDTSevere Thunderstorm WarningBOUWashington49 min
Sep 29, 3:42 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln31 min
Sep 29, 3:48 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Morgan57 min
Sep 29, 3:59 PM MDTSevere Thunderstorm WarningBOULogan, Washington46 min
Sep 29, 4:29 PM MDTSevere Thunderstorm WarningBOULincoln, Washington46 min
Sep 29, 4:31 PM MDTSevere Thunderstorm WarningBOUMorgan44 min
Sep 29, 4:45 PM MDTSevere Thunderstorm WarningBOULogan, Sedgwick26 min
Sep 29, 5:17 PM MDTTornado WarningBOUMorgan, Weld28 min
Sep 29, 5:28 PM MDTSevere Thunderstorm WarningBOUWashington32 min
Sep 29, 5:51 PM MDTSpecial Weather StatementBOULogan39 min
Sep 29, 5:57 PM MDTSpecial Weather StatementBOULincoln48 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.