Alert archive / Colorado / Tornado Warnings in 2015

Tornado Warning 45, NWS Denver/Boulder, CO

June 24, 2015Adams County, Denver County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 24, 2015, 5:09 PM MDT for Adams County, Denver County, Colorado. It was in force for 21 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 24, 2015, 5:09 PM MDT (23:09 UTC)
Expired
Jun 24, 2015, 5:30 PM MDT
In force
21 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

Counties Adams County, CO, Denver County, CO

The radar

The Denver radar (KFTG), 25 km from the middle of the area, began a volume at 23:10 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, 11.2 hours before the alert went out and 138 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 2015-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 145 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 2015-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 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
145 J/kg
Mixed-layer CIN
-342 J/kg
Mixed-layer LCL
3002 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
48 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.

826 
WFUS55 KBOU 242309
TORBOU
COC001-031-242330-
/O.NEW.KBOU.TO.W.0045.150624T2309Z-150624T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
509 PM MDT WED JUN 24 2015

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN ADAMS COUNTY IN NORTHEASTERN COLORADO...
  CENTRAL DENVER COUNTY IN NORTHEASTERN COLORADO...

* UNTIL 530 PM MDT
    
* AT 506 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR COMMERCE CITY...OR 7 MILES NORTHEAST OF
  DENVER...MOVING NORTH AT 10 MPH.

  HAZARD...TORNADO AND QUARTER 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...
  NORTHEASTERN DENVER...NORTHWESTERN AURORA AND SOUTHWESTERN DENVER
  INTERNATIONAL AIRPORT.

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 YOU ARE IN A MOBILE
HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3974 10490 3984 10490 3984 10474 3974 10474
TIME...MOT...LOC 2306Z 158DEG 26KT 3981 10487 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

COOPER
1 follow-up statement
253 
WWUS55 KBOU 242324
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
524 PM MDT WED JUN 24 2015

COC001-031-242331-
/O.EXP.KBOU.TO.W.0045.000000T0000Z-150624T2330Z/
ADAMS CO-DENVER CO-
524 PM MDT WED JUN 24 2015

...THE TORNADO WARNING FOR SOUTHWESTERN ADAMS AND CENTRAL DENVER
COUNTIES WILL EXPIRE AT 530 PM MDT...
    
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED. 
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER HEAVY RAIN 
IS STILL OCCURRING WITH THIS STORM AND FLASH FLOODING HAS BEEN 
REPORTED AS NEARLY 2 INCHES OF RAIN HAS FALLEN IN CENTRAL AND EAST 
CENTRAL PARTS OF DENVER.
 

LAT...LON 3974 10490 3984 10490 3984 10474 3974 10474
TIME...MOT...LOC 2320Z 158DEG 26KT 3981 10487 

$$

COOPER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 23, 7:09 PM MDTSevere Thunderstorm WarningBOULincoln36 min
Jun 23, 7:15 PM MDTSpecial Weather StatementBOUDenver30 min
Jun 23, 7:30 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld17 min
Jun 23, 7:32 PM MDTSevere Thunderstorm WarningBOULincoln28 min
Jun 23, 7:52 PM MDTSpecial Weather StatementBOUDenver23 min
Jun 23, 9:15 PM MDTSevere Thunderstorm WarningBOUWashington30 min
Jun 24, 3:36 PM MDTSpecial Weather StatementBOUElbert39 min
Jun 24, 4:45 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver, Jefferson45 min
Jun 24, 5:00 PM MDTTornado WarningBOUArapahoe, Denver19 min
Jun 24, 5:08 PM MDTAreal Flood AdvisoryBOUAdams, Arapahoe, Denver52 min
Jun 24, 5:22 PM MDTFlash Flood WarningBOUAdams, Arapahoe, Denver113 min

Nearby

Tornado Warnings in Colorado, 2015Every tornado warning in 2015Tornadoes in 2015

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.