Alert archive / Colorado / Tornado Warnings in 2015

Tornado Warning 21, NWS Denver/Boulder, CO

June 4, 2015Adams County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 4, 2015, 4:47 PM MDT for Adams County, Colorado. It was in force for 13 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: Jun 4, 2015, 4:47 PM MDT (22:47 UTC)
Expired: Jun 4, 2015, 5:00 PM MDT
In force: 13 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Adams County, CO

The radar

The Denver radar (KFTG), 45 km from the middle of the area, began a volume at 22:46 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jun 4, 2:20 PM MDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 10.8 hours before the alert went out and 69 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: 1510 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 900 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

570 
WFUS55 KBOU 042247
TORBOU
COC001-042300-
/O.NEW.KBOU.TO.W.0021.150604T2247Z-150604T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
447 PM MDT THU JUN 4 2015

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN ADAMS COUNTY IN NORTHEASTERN COLORADO...

* UNTIL 500 PM MDT
    
* AT 445 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 4 MILES WEST OF LEADER...OR 32 MILES SOUTHWEST
  OF FORT MORGAN...MOVING NORTH AT 5 MPH.

  HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES. 

* LOCATIONS IMPACTED INCLUDE...
  LEADER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM WILL BE CAPABLE OF PRODUCING A SHORT-LIVED LANDSPOUT 
TORNADO. 

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 3982 10390 3982 10423 3998 10424 3999 10390
TIME...MOT...LOC 2245Z 160DEG 4KT 3988 10414 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

DANKERS

1 follow-up statement

475 
WWUS55 KBOU 042259
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
459 PM MDT THU JUN 4 2015

COC001-042309-
/O.EXP.KBOU.TO.W.0021.000000T0000Z-150604T2300Z/
ADAMS CO-
459 PM MDT THU JUN 4 2015

...THE TORNADO WARNING FOR NORTHEASTERN ADAMS COUNTY WILL EXPIRE AT
500 PM MDT...
    
THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING 
HAS BEEN CANCELLED. HOWEVER...LARGE HAIL AND DAMAGING WINDS REMAIN 
LIKELY. 

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT FOR NORTHEASTERN
COLORADO.

LAT...LON 3982 10390 3982 10423 3998 10424 3999 10390
TIME...MOT...LOC 2257Z 160DEG 4KT 3988 10414 

$$

DANKERS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 6:02 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Douglas, Elbert	43 min
Jun 3, 6:29 PM MDT	Severe Thunderstorm Warning	BOU	Clear Creek, Jefferson	46 min
Jun 3, 6:41 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	64 min
Jun 3, 7:16 PM MDT	Special Weather Statement	BOU	Denver	44 min
Jun 3, 7:18 PM MDT	Severe Thunderstorm Warning	BOU	Boulder, Larimer, Weld	15 min
Jun 3, 7:45 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	45 min
Jun 3, 7:46 PM MDT	Special Weather Statement	BOU	Elbert	44 min
Jun 3, 7:58 PM MDT	Severe Thunderstorm Warning	BOU	Weld	32 min
Jun 3, 8:13 PM MDT	Severe Thunderstorm Warning	BOU	Larimer	32 min
Jun 3, 8:29 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	61 min
Jun 3, 8:33 PM MDT	Areal Flood Advisory	BOU	Arapahoe	117 min
Jun 3, 9:15 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	34 min
Jun 3, 10:43 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	47 min
Jun 3, 11:16 PM MDT	Special Weather Statement	BOU	Weld	44 min
Jun 3, 11:29 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	46 min
Jun 3, 11:48 PM MDT	Severe Thunderstorm Warning	BOU	Weld	27 min
Jun 4, 12:01 AM MDT	Severe Thunderstorm Warning	BOU	Weld	44 min
Jun 4, 2:24 PM MDT	Special Weather Statement	BOU	Elbert	51 min
Jun 4, 3:46 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	29 min
Jun 4, 4:28 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Denver	24 min
Jun 4, 4:48 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	27 min
Jun 4, 5:03 PM MDT	Severe Thunderstorm Warning	BOU	Adams	27 min
Jun 4, 5:05 PM MDT	Tornado Warning	BOU	Elbert	25 min
Jun 4, 5:16 PM MDT	Tornado Warning Tornado observed	BOU	Elbert	29 min
Jun 4, 5:49 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	26 min
Jun 4, 5:54 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	51 min
Jun 4, 5:58 PM MDT	Tornado Warning	BOU	Elbert	32 min

Nearby

Tornado Warnings in Colorado, 2015 Every tornado warning in 2015 Tornadoes 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.