Alert archive / Colorado / Tornado Warnings in 2014

Tornado Warning 28, NWS Denver/Boulder, CO

May 24, 2014Jefferson County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 24, 2014, 6:57 PM MDT for Jefferson County, Colorado. It was in force for 33 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: May 24, 2014, 6:57 PM MDT (00:57 UTC)
Expired: May 24, 2014, 7:30 PM MDT
In force: 33 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), 49 km from the middle of the area, began a volume at 00:59 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
May 24, 7:37 PM MDT	HAIL 1	6 Wsw Denver, CO

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

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 1.0 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.

368 
WFUS55 KBOU 250057
TORBOU
COC059-250130-
/O.NEW.KBOU.TO.W.0028.140525T0057Z-140525T0130Z/

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

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 730 PM MDT
    
* AT 656 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER EASTERN LAKEWOOD...OR 8 MILES WEST OF
  DENVER...MOVING NORTHWEST AT 5 MPH.

  HAZARD...TORNADO AND QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT   
    SHELTER. MOBILE HOMES MAY BE DAMAGED OR DESTROYED. DAMAGE TO 
	ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE DAMAGE IS LIKELY. 

* LOCATIONS IMPACTED INCLUDE...
  LAKEWOOD...WHEAT RIDGE AND SOUTHEASTERN GOLDEN. 

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 3970 10523 3979 10511 3969 10504 3968 10507
      3967 10506 3967 10507 3966 10508 3963 10510
TIME...MOT...LOC 0056Z 146DEG 5KT 3970 10511 

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

$$

BAKER

1 follow-up statement

780 
WWUS55 KBOU 250118
SVSBOU

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

COC059-250127-
/O.CAN.KBOU.TO.W.0028.000000T0000Z-140525T0130Z/
JEFFERSON CO-
718 PM MDT SAT MAY 24 2014

...THE TORNADO WARNING FOR NORTHEASTERN JEFFERSON COUNTY IS
CANCELLED...
                
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 CANCELLED.  

HOWEVER HAIL UP TO THREE-QUARTER INCH IN DIAMETER AND RAINFALL UP TO 
ONE-HALF INCH IN 15 MINUTES ARE STILL POSSIBLE WITH THIS  
THUNDERSTORM.

LAT...LON 3970 10523 3979 10511 3969 10504 3968 10507
      3967 10506 3967 10507 3966 10508 3963 10510
TIME...MOT...LOC 0113Z 146DEG 5KT 3972 10513 

$$

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, 6:38 PM MDT	Tornado Warning	BOU	Jefferson	37 min
May 24, 6:57 PM MDT	Areal Flood Advisory	BOU	Boulder	3 hr
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.