Alert archive / Nebraska / Tornado Warnings in 2003

Tornado Warning 77, NWS North Platte, NE

July 21, 2003Keith County, Nebraska

NWS North Platte, NE issued this tornado warning at Jul 21, 2003, 7:36 PM MDT for Keith County, Nebraska. It was in force for 24 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: Jul 21, 2003, 7:36 PM MDT (01:36 UTC)
Expired: Jul 21, 2003, 8:00 PM MDT
In force: 24 min
Issued by: NWS North Platte, NE
Area: Counties, with a storm outline in the text

County Keith County, NE

The radar

The North Platte radar (KLNX), 135 km from the middle of the area, began a volume at 01:38 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 21, 3:50 PM MDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.6 hours before the alert went out and 190 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: 108 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 3151 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

570 
WFUS53 KLBF 220136
TORLBF
NEC101-220200-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
736 PM MDT MON JUL 21 2003

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN KEITH COUNTY IN SOUTHWEST NEBRASKA

* UNTIL 800 PM MDT

* AT 733 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THE MOST DANGEROUS PART OF A SEVERE THUNDERSTORM WITH STRONG
  ROTATION 9 MILES NORTHWEST OF LEMOYNE...OR ABOUT 15 MILES SOUTHWEST
  OF ARTHUR...MOVING SOUTH AT 30 MPH. THIS STORM IS CAPABLE OF
  PRODUCING A TORNADO AT ANY TIME.

* THE DEVELOPING TORNADO WILL BE NEAR...
  4 MILES WEST OF LEMOYNE AROUND 750 PM MDT
  6 MILES NORTH OF BRULE AROUND 800 PM MDT

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM MDT MONDAY EVENING FOR
WESTERN NEBRASKA.

LAT...LON 4138 10204 4102 10204 4102 10162 4138 10165

$$

POWER

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 21, 6:06 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	54 min
Jul 21, 6:06 PM MDT	Tornado Warning	LBF	Chase	39 min
Jul 21, 6:16 PM MDT	Tornado Warning	LBF	Cherry, Grant	44 min
Jul 21, 6:29 PM MDT	Tornado Warning	LBF	Arthur	31 min
Jul 21, 6:41 PM MDT	Tornado Warning	LBF	Keith	49 min
Jul 21, 6:49 PM MDT	Tornado Warning	LBF	Chase	26 min
Jul 21, 6:51 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	24 min
Jul 21, 7:00 PM MDT	Tornado Warning	LBF	Arthur	30 min
Jul 21, 7:07 PM MDT	Severe Thunderstorm Warning	LBF	Frontier	38 min
Jul 21, 7:30 PM MDT	Tornado Warning	LBF	Arthur	30 min
Jul 21, 8:10 PM MDT	Severe Thunderstorm Warning	LBF	Frontier	50 min

Nearby

Tornado Warnings in Nebraska, 2003 Every tornado warning in 2003 Tornadoes in 2003

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.