Alert archive / Colorado / Tornado Warnings in 2014

Tornado Warning 81, NWS Denver/Boulder, CO

July 28, 2014Adams County, Denver County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 28, 2014, 4:02 PM MDT for Adams County, Denver County, Colorado. It was in force for 28 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: Jul 28, 2014, 4:02 PM MDT (22:02 UTC)
Expired: Jul 28, 2014, 4:30 PM MDT
In force: 28 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Adams County, CO, Denver County, CO

The radar

The Denver radar (KFTG), 28 km from the middle of the area, began a volume at 22:05 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, 10.0 hours before the alert went out and 141 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1 J/kg
Mixed-layer CIN: -392 J/kg
Mixed-layer LCL: 1653 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 38 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.

655 
WFUS55 KBOU 282202
TORBOU
COC001-031-282230-
/O.NEW.KBOU.TO.W.0081.140728T2202Z-140728T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
402 PM MDT MON JUL 28 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 430 PM MDT
    
* AT 402 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER NORTHEASTERN DENVER...MOVING NORTH AT 5
  MPH.

  HAZARD...TORNADO. 

  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...
  NORTHERN DENVER...WESTERN AURORA AND SOUTHERN COMMERCE CITY. 

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 3976 10492 3986 10491 3984 10480 3974 10482
TIME...MOT...LOC 2202Z 162DEG 5KT 3979 10487 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

RJK

1 follow-up statement

977 
WWUS55 KBOU 282233
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
433 PM MDT MON JUL 28 2014

COC001-031-282243-
/O.EXP.KBOU.TO.W.0081.000000T0000Z-140728T2230Z/
DENVER CO-ADAMS CO-
433 PM MDT MON JUL 28 2014

...THE TORNADO WARNING FOR CENTRAL DENVER AND SOUTHWESTERN ADAMS
COUNTIES HAS EXPIRED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 3976 10492 3986 10491 3984 10480 3974 10482
TIME...MOT...LOC 2229Z 162DEG 5KT 3979 10487 

$$

RJK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 6:11 PM MDT	Areal Flood Advisory	BOU	Douglas, Elbert	94 min
Jul 27, 6:53 PM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe	97 min
Jul 27, 11:06 PM MDT	Areal Flood Advisory	BOU	Lincoln	114 min
Jul 28, 1:22 PM MDT	Flash Flood Warning	BOU	Grand, Larimer	3 hr
Jul 28, 1:37 PM MDT	Flash Flood Watch	BOU	Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 13 more	52 hr
Jul 28, 3:50 PM MDT	Tornado Warning	BOU	Adams, Weld	25 min
Jul 28, 4:20 PM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe, Denver	3 hr
Jul 28, 4:38 PM MDT	Areal Flood Advisory	BOU	Adams	2 hr
Jul 28, 5:22 PM MDT	Areal Flood Advisory	BOU	Adams	113 min

Nearby

Tornado Warnings in Colorado, 2014 Every tornado warning in 2014 Tornadoes in 2014

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.