Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 21, NWS North Platte, NE

June 11, 1997Frontier County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jun 11, 1997, 5:58 PM CDT for Frontier County, Nebraska. It was in force for 47 min. 4 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 11, 1997, 5:58 PM CDT (22:58 UTC)
Expired: Jun 11, 1997, 6:45 PM CDT
In force: 47 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Frontier County, NE

The radar

The North Platte radar (KLNX), 160 km from the middle of the area, began a volume at 23:01 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
Jun 11, 6:08 PM CDT	Hail 0.75	Curtis, NE
Jun 11, 6:15 PM CDT	Hail 1	Stockville, NE
Jun 11, 6:25 PM CDT	Hail 1.75	Moorefield, NE
Jun 11, 6:26 PM CDT	Hail 0.88	Curtis, 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
Jun 11, 5:30 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.0 hours before the alert went out and 69 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: 270 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 578 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 279 m²/s²
0-3 km storm-relative helicity: 369 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 112300 RRA
SVRLBF
NEC063-112345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
558 PM CDT WED JUN 11 1997

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE NE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 645 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHWESTERN NEBRASKA

   ...NORTHEASTERN FRONTIER COUNTY
 
AT 556 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY NORTH PLATTE
DOPPLER RADAR 35 MILES WEST OF LEXINGTON OR 3 MILES NORTHWEST OF
MOOREFIELD MOVING EAST SOUTHEAST AT 30 MPH.

DAMAGING HAIL AND/OR DESTRUCTIVE WINDS CAN BE EXPECTED NEAR...
  STOCKVILLE                   BY 605 PM CDT
  MEDICINE CREEK DAM           BY 630 PM CDT
  EUSTIS                       BY 630 PM CDT



 A TORNADO WATCH IS ALSO IN EFFECT.  SEVERE THUNDERSTORMS CAN
PRODUCE TORNADOES.
 
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH
LITTLE OR NO ADVANCE WARNING.  IFR YOU ARE IN THE PATH OF THIS STORM
YOU SHOULD MOVE INSIDE A STRONG BUILDING AND GO TO THE LOWEST FLOOR
POSSIBLE.

RLB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 3:35 PM CDT	Severe Thunderstorm Warning	LBF	Custer	45 min
Jun 11, 3:44 PM CDT	Severe Thunderstorm Warning	LBF	Keya Paha	61 min
Jun 11, 3:52 PM CDT	Severe Thunderstorm Warning	LBF	Blaine	33 min
Jun 11, 4:00 PM CDT	Severe Thunderstorm Warning	LBF	Keith	45 min
Jun 11, 4:40 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	45 min
Jun 11, 5:15 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Loup	50 min
Jun 11, 5:24 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	61 min
Jun 11, 6:23 PM CDT	Severe Thunderstorm Warning	LBF	Brown, Rock	62 min
Jun 11, 6:47 PM CDT	Severe Thunderstorm Warning	LBF	Frontier	58 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1997 Every severe thunderstorm warning in 1997

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.