Alert archive / Nebraska / Tornado Warnings in 2002

Tornado Warning 11, NWS North Platte, NE

August 11, 2002Thomas County, Nebraska

NWS North Platte, NE issued this tornado warning at Aug 11, 2002, 6:16 PM CDT for Thomas County, Nebraska. It was in force for 29 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: Aug 11, 2002, 6:16 PM CDT (23:16 UTC)
Expired: Aug 11, 2002, 6:45 PM CDT
In force: 29 min
Issued by: NWS North Platte, NE
Area: Counties, with a storm outline in the text

County Thomas County, NE

The radar

The North Platte radar (KLNX), 14 km from the middle of the area, began a volume at 23:18 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
Aug 11, 6:25 PM CDT	Hail 1.75	Thedford, NE

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
Aug 11, 3:35 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.3 hours before the alert went out and 91 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: 1947 J/kg
Mixed-layer CIN: -210 J/kg
Mixed-layer LCL: 1660 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 68 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.

450 
WFUS53 KLBF 112316
TORLBF
NEC171-112345-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
616 PM CDT SUN AUG 11 2002

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN THOMAS COUNTY IN NORTH CENTRAL NEBRASKA

* UNTIL 645 PM CDT...

* AT 613 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THE MOST DANGEROUS PART OF A SEVERE THUNDERSTORM WITH STRONG
  ROTATION OVER EAST CENTRAL THOMAS COUNTY...OR ABOUT 12 MILES EAST
  OF THEDFORD...MOVING EAST AT 10 MPH. THIS STORM IS CAPABLE OF
  PRODUCING A TORNADO AT ANY TIME.

* THE DEVELOPING TORNADO IS EXPECTED TO BE...
  OVER FARM AND RANGELANDS OF EASTERN CENTRAL THOMAS COUNTY

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SUNDAY
EVENING FOR WESTERN NEBRASKA. A SEVERE THUNDERSTORM WATCH ALSO
REMAINS IN EFFECT UNTIL 1100 PM CDT SUNDAY EVENING FOR SOUTHWEST
NEBRASKA.

LAT...LON 4207 10050 4173 10049 4175 10027 4208 10028

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 7:52 PM CDT	Severe Thunderstorm Warning	LBF	Hooker	38 min
Aug 10, 8:28 PM CDT	Severe Thunderstorm Warning	LBF	Garfield, Loup	62 min
Aug 11, 1:20 AM CDT	Severe Thunderstorm Warning	LBF	Boyd	40 min
Aug 11, 1:59 AM CDT	Severe Thunderstorm Warning	LBF	Boyd	61 min
Aug 11, 7:33 AM CDT	Severe Thunderstorm Warning	LBF	Brown, Cherry, Keya Paha	42 min
Aug 11, 9:10 AM CDT	Severe Thunderstorm Warning	LBF	Rock	50 min
Aug 11, 10:42 AM CDT	Severe Thunderstorm Warning	LBF	Boyd, Keya Paha	48 min
Aug 11, 4:26 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Thomas	49 min
Aug 11, 5:36 PM CDT	Severe Thunderstorm Warning	LBF	Thomas	39 min
Aug 11, 6:46 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Thomas	44 min
Aug 11, 6:49 PM CDT	Severe Thunderstorm Warning	LBF	Loup	56 min

Nearby

Tornado Warnings in Nebraska, 2002 Every tornado warning in 2002 Tornadoes in 2002

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.