Alert archive / Colorado / Tornado Warnings in 2007

Tornado Warning 34, NWS Denver/Boulder, CO

May 14, 2007Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 14, 2007, 6:23 PM MDT for Weld County, Colorado. It was in force for 52 min. 4 reports 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 14, 2007, 6:23 PM MDT (00:23 UTC)
Expired: May 14, 2007, 7:15 PM MDT
In force: 52 min
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Weld County, CO

The radar

The Denver radar (KFTG), 48 km from the middle of the area, began a volume at 00:22 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 14, 6:24 PM MDT	HAIL 1	2 N Fort Lupton, CO	LOTS OF QUARTER SIZE HAIL...SEVERAL INCHES DEEP.
May 14, 6:28 PM MDT	TORNADO	Fort Lupton, CO	TORNADO IN OR NEAR FORT LUPTON
May 14, 6:53 PM MDT	HAIL 0.75	10 Sse Greeley, CO
May 14, 7:02 PM MDT	HAIL 1.75	3 Se Hudson, CO	MOSTLY 1/2 TO 3/4 INCH HAIL. SEVERAL GOLFBALL SIZE HAIL. RESIDENT REPORTED BROKEN WINDOWS.

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
May 14, 2:57 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.4 hours before the alert went out and 131 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: 774 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1671 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

000 
WFUS55 KBOU 150025
TORBOU
COC123-150115-
/O.NEW.KBOU.TO.W.0034.070515T0023Z-070515T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
623 PM MDT MON MAY 14 2007

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN WELD COUNTY IN NORTHEAST COLORADO

* UNTIL 715 PM MDT

* AT 623 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A POSSIBLE 
  TORNADO NEAR THE CITY OF FORT LUPTON...OR ABOUT 22 MILES SOUTH 
  OF GREELEY. THE STORM PRODUCING THIS TORNADO WAS ALONG A LINE OF 
  SEVERE THUNDERSTORMS MOVING EAST AT 25 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MILTON
  RESERVOIR...KERSEY...KEENESBURG...HUDSON...FREDERICK...FORT
  LUPTON...FIRESTONE...EVANS...DACONO AND SOUTHEASTERN GREELEY.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 4014 10495 4001 10495 4001 10446 4044 10429
      4041 10472 4023 10467

$$
BAKER

1 follow-up statement

000 
WWUS55 KBOU 150050
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
642 PM MDT MON MAY 14 2007

COC123-150115-
/O.CON.KBOU.TO.W.0034.000000T0000Z-070515T0115Z/
WELD CO-
642 PM MDT MON MAY 14 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM MDT FOR
SOUTHWESTERN WELD COUNTY...

AT 628 PM MDT...TRAINED WEATHER SPOTTERS REPORT A POSSIBLE 
TORNADO NEAR THE CITY OF FORT LUPTON. THE STORM PRODUCING THIS 
POSSIBLE TORNADO WAS A PART OF A LINE OF SEVERE THUNDERSTORMS 
PRESENTLY MOVING EAST ACROSS SOUTHWEST WELD COUNTY AT 20 MPH. 

AT 645 PM MDT...THE STRONGEST STORMS WERE LOCATED NEAR HUDSON...
OR ABOUT 23 MILES SOUTH OF GREELEY. 

THIS LINE OF SEVERE THUNDERSTORMS WERE PRODUCING VERY HEAVY RAIN...
PENNY TO NICKLE SIZE HAIL...AND DAMAGING STRAIGHT LINE WINDS. 
NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES WIND SPEEDS OF 
50 TO 60 MPH IN AN AREA FROM HUDSON TO JUST NORTHWEST OF KEENESBURG.
THESE WINDS WILL BE BE CAPABLE OF CONSIDERABLE DAMAGE.  

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
MILTON RESERVOIR...KERSEY...KEENESBURG...HUDSON...FREDERICK...FORT
LUPTON...FIRESTONE...EVANS...DACONO AND SOUTHEASTERN GREELEY.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 4014 10495 4001 10495 4001 10446 4044 10429
      4041 10472 4023 10467

$$
BAKER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 6:11 PM MDT	Severe Thunderstorm Warning	BOU	Weld	64 min
May 14, 6:57 PM MDT	Tornado Warning	BOU	Adams, Weld	48 min
May 14, 7:15 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Denver, Jefferson	60 min
May 14, 7:27 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan	33 min
May 14, 7:46 PM MDT	Tornado Warning	BOU	Adams, Morgan	29 min
May 14, 7:55 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	47 min
May 14, 8:19 PM MDT	Tornado Warning	BOU	Adams, Washington	41 min
May 14, 8:25 PM MDT	Tornado Warning	BOU	Arapahoe, Elbert	33 min
May 14, 8:52 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	53 min

Nearby

Tornado Warnings in Colorado, 2007 Every tornado warning in 2007 Tornadoes in 2007

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.