Alert archive / Colorado / Tornado Warnings in 2016

Tornado Warning 17, NWS Denver/Boulder, CO

June 23, 2016Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 23, 2016, 6:52 PM MDT for Washington County, Colorado. It was in force for 23 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 23, 2016, 6:52 PM MDT (00:52 UTC)
Expired: Jun 23, 2016, 7:15 PM MDT
In force: 23 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Washington County, CO

The radar

The Denver radar (KFTG), 137 km from the middle of the area, began a volume at 00:53 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.

What was reported inside it

Time	Report	Where	Remark
Jun 23, 6:58 PM MDT	HAIL 0.75	11 Nne Akron, CO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 23, 6:21 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.9 hours before the alert went out and 229 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: 477 J/kg
Mixed-layer CIN: -263 J/kg
Mixed-layer LCL: 1659 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted.

571 
WFUS55 KBOU 240052
TORBOU
COC121-240115-
/O.NEW.KBOU.TO.W.0017.160624T0052Z-160624T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
652 PM MDT THU JUN 23 2016

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 715 PM MDT
    
* AT 652 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 7 MILES NORTH OF PLATNER...OR 10 MILES
  NORTHEAST OF AKRON...MOVING EAST AT 25 MPH.

  HAZARD...TORNADO AND QUARTER SIZE HAIL. 

  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. 

* THIS TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  NORTHEASTERN WASHINGTON COUNTY.

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 OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER
AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4019 10312 4030 10317 4038 10300 4022 10286
TIME...MOT...LOC 0052Z 263DEG 22KT 4027 10307 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

RJK

1 follow-up statement

851 
WWUS55 KBOU 240117
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
717 PM MDT THU JUN 23 2016

COC121-240126-
/O.EXP.KBOU.TO.W.0017.000000T0000Z-160624T0115Z/
WASHINGTON CO-
717 PM MDT THU JUN 23 2016

...THE TORNADO WARNING FOR NORTHEASTERN WASHINGTON COUNTY HAS
EXPIRED...
    
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT
OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM MDT FOR
NORTHEASTERN COLORADO.

LAT...LON 4019 10312 4030 10317 4038 10300 4022 10286
TIME...MOT...LOC 0116Z 263DEG 22KT 4027 10307 

$$

RJK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 6:29 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Sedgwick	46 min
Jun 23, 7:48 PM MDT	Areal Flood Advisory	BOU	Washington	117 min
Jun 23, 8:08 PM MDT	Areal Flood Advisory	BOU	Phillips, Sedgwick	3 hr
Jun 23, 9:31 PM MDT	Special Weather Statement	BOU	Boulder	29 min
Jun 23, 11:13 PM MDT	Severe Thunderstorm Warning	BOU	Washington	20 min
Jun 24, 2:12 PM MDT	Special Weather Statement	BOU	Elbert	48 min

Nearby

Tornado Warnings in Colorado, 2016 Every tornado warning in 2016 Tornadoes in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.