Alert archive / Colorado / Tornado Warnings in 2015
Tornado Warning 53, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Aug 11, 2015, 4:04 PM MDT for Adams County, Denver County, Colorado. It was in force for 26 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
- Aug 11, 2015, 4:04 PM MDT (22:04 UTC)
- Expired
- Aug 11, 2015, 4:30 PM MDT
- In force
- 26 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), 14 km from the middle of the area, began a volume at 22:07 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, 10.1 hours before the alert went out and 127 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
- 7 J/kg
- Mixed-layer CIN
- -292 J/kg
- Mixed-layer LCL
- 2089 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
855
WFUS55 KBOU 112204
TORBOU
COC001-031-112230-
/O.NEW.KBOU.TO.W.0053.150811T2204Z-150811T2230Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
404 PM MDT TUE AUG 11 2015
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* TORNADO WARNING FOR...
NORTHEASTERN DENVER COUNTY IN NORTHEASTERN COLORADO...
SOUTHWESTERN ADAMS COUNTY IN NORTHEASTERN COLORADO...
* UNTIL 430 PM MDT
* AT 403 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR DENVER INTERNATIONAL AIRPORT...OR 13 MILES
NORTHEAST OF DENVER...NEARLY STATONARY.
HAZARD...TORNADO AND QUARTER SIZE HAIL.
SOURCE...WEATHER SPOTTERS REPORTED FUNNEL CLOUD.
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...EASTERN COMMERCE
CITY...DENVER INTERNATIONAL AIRPORT AND D.I.A. TERMINAL AND
CONCOURSES.
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.
TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
DENVER.
&&
LAT...LON 3974 10469 3974 10484 3990 10473 3990 10462
TIME...MOT...LOC 2203Z 092DEG 6KT 3982 10473
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
COOPER1 follow-up statement
722
WWUS55 KBOU 112229
SVSBOU
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
429 PM MDT TUE AUG 11 2015
COC001-031-112238-
/O.EXP.KBOU.TO.W.0053.000000T0000Z-150811T2230Z/
DENVER CO-ADAMS CO-
429 PM MDT TUE AUG 11 2015
...THE TORNADO WARNING FOR NORTHEASTERN DENVER AND SOUTHWESTERN ADAMS
COUNTIES WILL EXPIRE AT 430 PM MDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.
LAT...LON 3974 10469 3974 10484 3990 10473 3990 10462
TIME...MOT...LOC 2226Z 092DEG 6KT 3982 10473
$$
COOPERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 2:16 PM MDT | Areal Flood Advisory | BOU | Larimer | 3 hr |
| Aug 11, 3:14 PM MDT | Special Weather Statement | BOU | Douglas | 46 min |
| Aug 11, 3:39 PM MDT | Special Weather Statement | BOU | Denver | 51 min |
| Aug 11, 3:55 PM MDT | Tornado Warning | BOU | Arapahoe | 35 min |
| Aug 11, 4:26 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Douglas | 10 min |
| Aug 11, 4:40 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Denver, Douglas | 95 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.