Alert archive / Colorado / Tornado Warnings in 2001

Tornado Warning 41, NWS Denver/Boulder, CO

July 23, 2001Phillips County, Sedgwick County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 23, 2001, 3:46 PM MDT for Phillips County, Sedgwick County, Colorado. It was in force for 29 min. 2 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 23, 2001, 3:46 PM MDT (21:46 UTC)
Expired: Jul 23, 2001, 4:15 PM MDT
In force: 29 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Phillips County, CO, Sedgwick County, CO

The radar

The Goodland radar (KGLD), 162 km from the middle of the area, began a volume at 21:49 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
Jul 23, 4:14 PM MDT	Hail 1.75	Julesburg, CO
Jul 23, 4:16 PM MDT	Hail 1.75	Amherst, 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 23, 3:45 PM MDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 9.8 hours before the alert went out and 127 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: 34 J/kg
Mixed-layer CIN: -486 J/kg
Mixed-layer LCL: 2402 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: -1 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.

000 
WFUS55 KBOU 232148
TORDEN

COC095-115-232215-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
346 PM MDT MON JUL 23 2001

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN PHILLIPS COUNTY IN NORTHEAST COLORADO
  SOUTHEASTERN SEDGWICK COUNTY IN NORTHEAST COLORADO

* UNTIL 415 PM MDT

* AT 346 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH A POSSIBLE TORNADO 3 MILES NORTHWEST OF          
  AMHERST...OR ABOUT 10 MILES NORTHEAST OF HOLYOKE...MOVING SLOWLY   
  EAST AT 5 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...AMHERST
AND SIXTEEN-MILE CORNER.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

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.

LAT...LON 4086 10242 4060 10240 4062 10208 4085 10208

KLEYLA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 3:28 PM MDT	Severe Thunderstorm Warning	BOU	Phillips, Sedgwick	47 min
Jul 23, 3:59 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Denver	46 min
Jul 23, 4:13 PM MDT	Tornado Warning	BOU	Phillips, Sedgwick	27 min
Jul 23, 5:44 PM MDT	Severe Thunderstorm Warning	BOU	Adams	31 min

Nearby

Tornado Warnings in Colorado, 2001 Every tornado warning in 2001 Tornadoes in 2001

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.