Alert archive / Colorado / Tornado Warnings in 2000

Tornado Warning 15, NWS Denver/Boulder, CO

July 5, 2000Logan County, Sedgwick County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 5, 2000, 7:40 PM MDT for Logan County, Sedgwick County, Colorado. It was in force for 65 min. 3 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Jul 5, 2000, 7:40 PM MDT (01:40 UTC)
Expired: Jul 5, 2000, 8:45 PM MDT
In force: 65 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Logan County, CO, Sedgwick County, CO

The radar

The Cheyenne radar (KCYS), 178 km from the middle of the area, began a volume at 01:42 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
Jul 5, 8:25 PM MDT	Hail 1.75	Crook, CO
Jul 5, 8:45 PM MDT	Hail 4.5	Crook, CO
Jul 5, 8:50 PM MDT	Hail 2.75	Crook, CO

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 5, 5:45 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.7 hours before the alert went out and 128 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: 120 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 3637 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 102 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.

575 
WFUS55 KBOU 060143
TORDEN
COC075-115-060245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
740 PM MDT WED JUL 5 2000

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN LOGAN COUNTY IN NORTHEAST COLORADO
  WESTERN SEDGWICK COUNTY IN NORTHEAST COLORADO
  THIS INCLUDES THE CITY OF JULESBURG

* UNTIL 845 PM MDT

* AT 740 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH A POSSIBLE TORNADO 16 MILES NORTHWEST OF TWIN   
  BUTTES...OR ABOUT 3 MILES SOUTH OF SIDNEY NEBRASKA...MOVING SOUTHEAST AT 
  25 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...TWIN
BUTTES...SEDGWICK...OVID...JULESBURG AND CROOK

THIS STORM HAS PRODUCED HAIL ONE AND A QUARTER INCHES IN DIAMETER AND 
WIND GUSTS TO 60 MPH IN THE SIDNEY AREA.  

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 4100 10302 4073 10265 4099 10221 4100 10259

GIMMESTAD
&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 8:28 PM MDT	Tornado Warning	BOU	Logan, Phillips, Sedgwick	62 min
Jul 5, 9:14 PM MDT	Tornado Warning	BOU	Logan, Phillips, Sedgwick	46 min
Jul 5, 9:56 PM MDT	Tornado Warning	BOU	Phillips	34 min

Nearby

Tornado Warnings in Colorado, 2000 Every tornado warning in 2000 Tornadoes in 2000

Sources

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