Alert archive / Colorado / Tornado Warnings in 2013

Tornado Warning 36, NWS Denver/Boulder, CO

June 23, 2013Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 23, 2013, 8:25 PM MDT for Washington County, Colorado. It was in force for 35 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 23, 2013, 8:25 PM MDT (02:25 UTC)
Expired: Jun 23, 2013, 9:00 PM MDT
In force: 35 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), 123 km from the middle of the area, began a volume at 02:25 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 23, 4:40 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 2.4 hours before the alert went out and 18 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: 73 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 3153 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

589 
WFUS55 KBOU 240225
TORBOU
COC121-240300-
/O.NEW.KBOU.TO.W.0036.130624T0225Z-130624T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
825 PM MDT SUN JUN 23 2013

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN WASHINGTON COUNTY IN NORTHEAST COLORADO...

* UNTIL 900 PM MDT
    
* AT 824 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER ANTON...OR 28 MILES SOUTH OF AKRON... 
  MOVING EAST AT 25 MPH.  ANOTHER POSSIBLE TORNADO WAS LOCATED NEAR 
  ELBA AND WAS ALSO MOVING EAST AT 25 MPH.

  HAZARD...TORNADO AND QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED ROTATION. 

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

* LOCATIONS IMPACTED INCLUDE...
  ELBA...ARICKAREE SCHOOL...THURMAN AND ANTON. 

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

&&

LAT...LON 3959 10325 3996 10324 3996 10290 3959 10289
TIME...MOT...LOC 0224Z 268DEG 23KT 3974 10320 

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

$$

RPK

3 follow-up statements

117 
WWUS55 KBOU 240233
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
833 PM MDT SUN JUN 23 2013

COC121-240300-
/O.CON.KBOU.TO.W.0036.000000T0000Z-130624T0300Z/
WASHINGTON CO-
833 PM MDT SUN JUN 23 2013

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM MDT FOR
SOUTHEASTERN WASHINGTON COUNTY...
    
AT 832 PM MDT...SEVERE THUNDERSTORMS CAPABLE OF PRODUCING TORNADOES
WERE LOCATED ALONG A LINE EXTENDING FROM 5 MILES NORTHEAST OF ELBA TO
NEAR THURMAN...MOVING EAST AT 35 MPH.

HAZARD...TORNADO AND GOLF BALL SIZE HAIL. 

SOURCE...RADAR INDICATED ROTATION. 

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

LOCATIONS IMPACTED INCLUDE...
ARICKAREE SCHOOL...THURMAN AND ANTON. 

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

&&

LAT...LON 3959 10325 3996 10317 3996 10290 3959 10289
TIME...MOT...LOC 0232Z 258DEG 30KT 3997 10309 3960 10317 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

RPK

715 
WWUS55 KBOU 240243
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
843 PM MDT SUN JUN 23 2013

COC121-240300-
/O.CON.KBOU.TO.W.0036.000000T0000Z-130624T0300Z/
WASHINGTON CO-
843 PM MDT SUN JUN 23 2013

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM MDT FOR
SOUTHEASTERN WASHINGTON COUNTY...
    
AT 843 PM MDT...SEVERE THUNDERSTORMS CAPABLE OF PRODUCING TORNADOES
WERE LOCATED ALONG A LINE EXTENDING FROM 8 MILES NORTHEAST OF ELBA TO
5 MILES EAST OF THURMAN...MOVING EAST AT 25 MPH.

HAZARD...TORNADO AND GOLF BALL SIZE HAIL. 

SOURCE...RADAR INDICATED ROTATION. 

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

LOCATIONS IMPACTED INCLUDE...
ARICKAREE SCHOOL AND THURMAN. 

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

&&

LAT...LON 3959 10322 3996 10315 3996 10290 3959 10289
TIME...MOT...LOC 0243Z 268DEG 23KT 3997 10303 3960 10311 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

RPK

557 
WWUS55 KBOU 240305
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
905 PM MDT SUN JUN 23 2013

COC121-240315-
/O.EXP.KBOU.TO.W.0036.000000T0000Z-130624T0300Z/
WASHINGTON CO-
905 PM MDT SUN JUN 23 2013

...THE TORNADO WARNING FOR SOUTHEASTERN WASHINGTON COUNTY HAS
EXPIRED...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
BEEN CANCELLED. HOWEVER...LARGE HAIL AND DAMAGING WINDS REMAIN LIKELY
AND A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THE AREA.


LAT...LON 3959 10322 3996 10315 3996 10290 3959 10289
TIME...MOT...LOC 0302Z 268DEG 23KT 3997 10303 3960 10311 

$$

RPK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 6:12 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	33 min
Jun 23, 6:44 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	31 min
Jun 23, 7:15 PM MDT	Tornado Warning	BOU	Adams, Washington	30 min
Jun 23, 7:17 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe	28 min
Jun 23, 7:46 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe	29 min
Jun 23, 8:10 PM MDT	Severe Thunderstorm Warning	BOU	Washington	35 min
Jun 23, 8:40 PM MDT	Severe Thunderstorm Warning	BOU	Washington	35 min
Jun 23, 9:00 PM MDT	Severe Thunderstorm Warning	BOU	Washington	30 min
Jun 23, 9:07 PM MDT	Special Weather Statement	BOU	Denver	23 min
Jun 23, 9:29 PM MDT	Severe Thunderstorm Warning	BOU	Washington	31 min
Jun 23, 10:07 PM MDT	Severe Thunderstorm Warning	BOU	Washington	38 min
Jun 23, 10:14 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan, Weld	46 min
Jun 24, 1:30 AM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	45 min
Jun 24, 5:01 AM MDT	Red Flag Warning	BOU	Arapahoe, Clear Creek, Douglas, Elbert, Gilpin, Grand and 4 more	15 hr
Jun 24, 2:32 PM MDT	Red Flag Warning	BOU	Boulder, Clear Creek, Douglas, Gilpin, Jefferson, Larimer and 1 more	27 hr

Nearby

Tornado Warnings in Colorado, 2013 Every tornado warning in 2013 Tornadoes in 2013

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.