Alert archive / Colorado / Tornado Warnings in 2012
Tornado Warning 25, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Sep 27, 2012, 1:15 PM MDT for Douglas County, Colorado. It was in force for 29 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 27, 2012, 1:15 PM MDT (19:15 UTC)
- Expired
- Sep 27, 2012, 1:44 PM MDT
- In force
- 29 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Douglas County, CO
The radar
The Denver radar (KFTG), 71 km from the middle of the area, began a volume at 19:14 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 (KDNR), launched 12:00Z, 7.3 hours before the alert went out and 160 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
- 50 J/kg
- Mixed-layer CIN
- -111 J/kg
- Mixed-layer LCL
- 1041 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
522
WFUS55 KBOU 271915
TORBOU
COC035-272000-
/O.NEW.KBOU.TO.W.0025.120927T1915Z-120927T2000Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
115 PM MDT THU SEP 27 2012
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHERN DOUGLAS COUNTY IN NORTHEAST COLORADO
* UNTIL 200 PM MDT
* AT 115 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD
NEARLY TOUCHING THE GROUND EAST OF LARKSPUR...OR 23 MILES NORTH OF
COLORADO SPRINGS. THIS STORM WAS MOVING EAST AT 10 MPH.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LARKSPUR.
LAT...LON 3919 10501 3933 10475 3924 10468 3912 10493
3913 10494
TIME...MOT...LOC 1915Z 250DEG 9KT 3919 10488
$$1 follow-up statement
056
WWUS55 KBOU 271944
SVSBOU
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
144 PM MDT THU SEP 27 2012
COC035-271953-
/O.CAN.KBOU.TO.W.0025.000000T0000Z-120927T2000Z/
DOUGLAS CO-
144 PM MDT THU SEP 27 2012
...THE TORNADO WARNING FOR SOUTHERN DOUGLAS COUNTY IS CANCELLED...
THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO
LONGER EXPECTED TO PRODUCE SEVERE WEATHER.
A BRIEF TORNADO TOUCHDOWN WAS REPORTED BY STORM SPOTTERS ABOUT 6
MILES EAST OF LARKSPUR AROUND 120 PM.
LAT...LON 3919 10501 3933 10475 3924 10468 3912 10493
3913 10494
TIME...MOT...LOC 1943Z 250DEG 9KT 3921 10479
$$The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 26, 6:20 PM MDT | Areal Flood Advisory | BOU | Weld | 85 min |
| Sep 26, 6:48 PM MDT | Flash Flood Warning | BOU | Weld | 2 hr |
| Sep 27, 1:29 PM MDT | Tornado Warning | BOU | Elbert | 31 min |
| Sep 27, 4:40 PM MDT | Areal Flood Advisory | BOU | Washington | 80 min |
| Sep 27, 5:00 PM MDT | Special Weather Statement | BOU | Weld | 30 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.