Alert archive / Colorado / Tornado Warnings in 2014

Tornado Warning 27, NWS Denver/Boulder, CO

May 24, 2014Jefferson County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 24, 2014, 6:38 PM MDT for Jefferson County, Colorado. It was in force for 37 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: May 24, 2014, 6:38 PM MDT (00:38 UTC)
Expired: May 24, 2014, 7:15 PM MDT
In force: 37 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Jefferson County, CO

The radar

The Denver radar (KFTG), 51 km from the middle of the area, began a volume at 00:40 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 00:00Z, 0.6 hours before the alert went out and 162 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: 459 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1429 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 10 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.

840 
WFUS55 KBOU 250038
TORBOU
COC059-250115-
/O.NEW.KBOU.TO.W.0027.140525T0038Z-140525T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
638 PM MDT SAT MAY 24 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL JEFFERSON COUNTY IN CENTRAL COLORADO...

* UNTIL 715 PM MDT
    
* AT 637 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR CHATFIELD RESERVOIR...OR 11 MILES
  SOUTHWEST OF DENVER...MOVING NORTHWEST AT 10 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. 

* LOCATIONS IMPACTED INCLUDE...
  SOUTHEASTERN LAKEWOOD...LITTLETON AND CHATFIELD RESERVOIR. 

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 10517 3967 10509 3965 10506 3964 10508
      3963 10511 3962 10511 3963 10508 3961 10506
      3957 10505 3954 10508
TIME...MOT...LOC 0037Z 150DEG 7KT 3959 10508 

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

$$

BAKER

1 follow-up statement

843 
WWUS55 KBOU 250114
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
714 PM MDT SAT MAY 24 2014

COC059-250123-
/O.EXP.KBOU.TO.W.0027.000000T0000Z-140525T0115Z/
JEFFERSON CO-
714 PM MDT SAT MAY 24 2014

...THE TORNADO WARNING FOR EAST CENTRAL JEFFERSON COUNTY WILL EXPIRE
AT 715 PM MDT...
        
THE STORM WHICH PROMPTED THE WARNING FOR EAST CENTRAL JEFFERSON 
COUNTY NEAR MARSTON RESERVOIR HAS MOVED OUT OF THE AREA. THEREFORE 
THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER SMALL HAIL AND HEAVY 
RAIN ARE STILL POSSIBLE WITH THUNDERSTORMS IN THE AREA.

LAT...LON 3959 10517 3967 10509 3965 10506 3964 10508
      3963 10511 3962 10511 3963 10508 3961 10506
      3957 10505 3954 10508
TIME...MOT...LOC 0108Z 150DEG 7KT 3959 10508 

$$

BAKER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 24, 6:18 PM MDT	Areal Flood Advisory	BOU	Arapahoe, Douglas, Jefferson	3 hr
May 24, 6:25 PM MDT	Areal Flood Advisory	BOU	Jefferson	3 hr
May 24, 6:57 PM MDT	Areal Flood Advisory	BOU	Boulder	3 hr
May 24, 6:57 PM MDT	Tornado Warning	BOU	Jefferson	33 min
May 24, 7:39 PM MDT	Areal Flood Advisory	BOU	Jefferson	3 hr
May 24, 8:29 PM MDT	Areal Flood Advisory	BOU	Boulder	2 hr
May 25, 5:23 AM MDT	Areal Flood Warning	BOU	Jackson	48 hr
May 25, 9:48 AM MDT	Areal Flood Advisory	BOU	Grand, Jackson	6 days
May 25, 10:14 AM MDT	River Flood Warning	BOU	Weld	4 days
May 25, 10:24 AM MDT	River Flood Advisory	BOU	Larimer	30 hr
May 25, 12:18 PM MDT	Areal Flood Advisory	BOU	Larimer	87 min
May 25, 12:38 PM MDT	Special Weather Statement	BOU	Jefferson	37 min
May 25, 12:50 PM MDT	Special Weather Statement	BOU	Douglas	40 min
May 25, 12:57 PM MDT	Severe Thunderstorm Warning	BOU	Douglas	33 min
May 25, 1:34 PM MDT	Severe Thunderstorm Warning	BOU	Douglas	26 min
May 25, 2:03 PM MDT	Areal Flood Advisory	BOU	Larimer	117 min
May 25, 2:19 PM MDT	Flash Flood Warning	BOU	Larimer	2 hr
May 25, 2:25 PM MDT	Special Weather Statement	BOU	Douglas	35 min
May 25, 3:07 PM MDT	Severe Thunderstorm Warning	BOU	Jefferson	38 min
May 25, 3:13 PM MDT	Special Weather Statement	BOU	Denver	32 min
May 25, 3:21 PM MDT	Special Weather Statement	BOU	Gilpin	24 min
May 25, 4:40 PM MDT	Special Weather Statement	BOU	Boulder	35 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.