Alert archive / Colorado / Tornado Warnings in 2012
Tornado Warning 1, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Apr 11, 2012, 5:06 PM MDT for Adams County, Arapahoe County, Denver County, Colorado. It was in force for 24 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
- Apr 11, 2012, 5:06 PM MDT (23:06 UTC)
- Expired
- Apr 11, 2012, 5:30 PM MDT
- In force
- 24 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
Counties Adams County, CO, Arapahoe County, CO, Denver County, CO
The radar
The Denver radar (KFTG), 22 km from the middle of the area, began a volume at 23:06 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 (KDNR), launched 12:00Z, 11.1 hours before the alert went out and 133 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.
- Mixed-layer CAPE
- 9 J/kg
- Mixed-layer CIN
- -468 J/kg
- Mixed-layer LCL
- 724 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
701 WFUS55 KBOU 112306 TORBOU COC001-005-031-112330- /O.NEW.KBOU.TO.W.0001.120411T2306Z-120411T2330Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DENVER CO 506 PM MDT WED APR 11 2012 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * TORNADO WARNING FOR... NORTHWESTERN ARAPAHOE COUNTY IN NORTHEAST COLORADO WESTERN ADAMS COUNTY IN NORTHEAST COLORADO EASTERN DENVER COUNTY IN NORTHEAST COLORADO * UNTIL 530 PM MDT * AT 505 PM MDT...THE PUBLIC REPORTED A TORNADO NEAR 38TH AND TOWER ROAD...ABOUT 6 MILES NORTH OF AURORA...OR 10 MILES NORTHEAST OF DENVER. THIS STORM WAS MOVING NORTH AT 25 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BUCKLEY AFB...BARR LAKE...WESTERN DENVER INTERNATIONAL AIRPORT... NORTHEASTERN DENVER...NORTHEASTERN COMMERCE CITY AND NORTHWESTERN 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. IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING LARGE DAMAGING HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. && LAT...LON 3996 10481 3996 10465 3967 10474 3968 10493 TIME...MOT...LOC 2305Z 199DEG 18KT 3982 10479 $$
1 follow-up statement
179 WWUS55 KBOU 112327 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 527 PM MDT WED APR 11 2012 COC001-005-031-112337- /O.EXP.KBOU.TO.W.0001.000000T0000Z-120411T2330Z/ ARAPAHOE CO-ADAMS CO-DENVER CO- 527 PM MDT WED APR 11 2012 ...THE TORNADO WARNING FOR EASTERN DENVER...WESTERN ADAMS AND NORTHWESTERN ARAPAHOE COUNTIES WILL EXPIRE AT 530 PM MDT... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED THEREFORE THE TORNADO WARNING WILL BE ALLOWED TO EXPIRE. LAT...LON 3996 10481 3996 10465 3967 10474 3968 10493 TIME...MOT...LOC 2327Z 199DEG 18KT 3992 10474 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 4:44 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 27 min |
| Apr 11, 4:56 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver | 32 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.