Alert archive / Colorado / Tornado Warnings in 2012

Tornado Warning 22, NWS Denver/Boulder, CO

June 15, 2012Adams County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 15, 2012, 3:02 PM MDT for Adams County, Colorado. It was in force for 28 min. 1 report 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 15, 2012, 3:02 PM MDT (21:02 UTC)
Expired
Jun 15, 2012, 3:30 PM MDT
In force
28 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon

County Adams County, CO

The radar

The Denver radar (KFTG), 7 km from the middle of the area, began a volume at 21:02 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 15, 3:06 PM MDTTORNADO1 N Bennett, COWEAK TORNADO IN OPEN FIELD ON GROUND FOR 10 MINUTES. NO DAMAGE REPORTED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

IssuedProductOfficeLasted
Jun 15, 1:35 PM MDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 9.0 hours before the alert went out and 106 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 2012-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 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 2012-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -227 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
7 J/kg
Mixed-layer CIN
-278 J/kg
Mixed-layer LCL
1830 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-227 m²/s²
0-3 km storm-relative helicity
9 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.

660 
WFUS55 KBOU 152102
TORBOU
COC001-152130-
/O.NEW.KBOU.TO.W.0022.120615T2102Z-120615T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
302 PM MDT FRI JUN 15 2012

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 330 PM MDT

* AT 302 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 2 MILES NORTH OF
  MANILA VILLAGE...OR 23 MILES EAST OF DENVER. THIS STORM WAS MOVING
  NORTHEAST AT 15 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MANILA
  VILLAGE...BENNETT AND NORTHEASTERN AURORA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO 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 3986 10440 3974 10442 3974 10458 3986 10456
TIME...MOT...LOC 2102Z 241DEG 14KT 3980 10451

$$
2 follow-up statements
384 
WWUS55 KBOU 152107
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
307 PM MDT FRI JUN 15 2012

COC001-152130-
/O.CON.KBOU.TO.W.0022.000000T0000Z-120615T2130Z/
ADAMS CO-
307 PM MDT FRI JUN 15 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM MDT FOR SOUTH
CENTRAL ADAMS COUNTY...

AT 307 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
TORNADO.  THIS STORM WAS LOCATED 3 MILES NORTHEAST OF MANILA
VILLAGE...OR 25 MILES EAST OF DENVER. THIS STORM WAS MOVING EAST AT
10 MPH.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
MANILA VILLAGE...BENNETT AND NORTHEASTERN AURORA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO 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 3986 10440 3974 10442 3974 10458 3986 10456
TIME...MOT...LOC 2107Z 256DEG 7KT 3979 10449

$$
865 
WWUS55 KBOU 152126
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
326 PM MDT FRI JUN 15 2012

COC001-152136-
/O.EXP.KBOU.TO.W.0022.000000T0000Z-120615T2130Z/
ADAMS CO-
326 PM MDT FRI JUN 15 2012

...THE TORNADO WARNING FOR SOUTH CENTRAL ADAMS COUNTY WILL EXPIRE AT
330 PM MDT...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO
LONGER EXPECTED TO PRODUCE SEVERE WEATHER.

LAT...LON 3986 10440 3974 10442 3974 10458 3986 10456
TIME...MOT...LOC 2126Z 256DEG 7KT 3980 10444

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 14, 8:40 PM MDTSpecial Weather StatementBOULincoln35 min
Jun 14, 9:08 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln37 min
Jun 14, 9:41 PM MDTSevere Thunderstorm WarningBOULincoln34 min
Jun 14, 10:11 PM MDTSevere Thunderstorm WarningBOULincoln49 min
Jun 15, 2:50 AM MDTSpecial Weather StatementBOUArapahoe40 min
Jun 15, 1:49 PM MDTSpecial Weather StatementBOUJefferson26 min
Jun 15, 2:14 PM MDTSpecial Weather StatementBOUDouglas31 min
Jun 15, 2:20 PM MDTSevere Thunderstorm WarningBOUArapahoe, Douglas40 min
Jun 15, 2:33 PM MDTSevere Thunderstorm WarningBOUAdams, Denver42 min
Jun 15, 3:27 PM MDTSpecial Weather StatementBOUAdams, Arapahoe33 min
Jun 15, 3:52 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe38 min
Jun 15, 4:31 PM MDTSpecial Weather StatementBOUArapahoe29 min
Jun 15, 5:21 PM MDTSpecial Weather StatementBOULincoln24 min
Jun 15, 5:41 PM MDTSpecial Weather StatementBOUWashington34 min
Jun 15, 5:59 PM MDTSevere Thunderstorm WarningBOUWashington31 min

Nearby

Tornado Warnings in Colorado, 2012Every tornado warning in 2012Tornadoes in 2012

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.