Alert archive / Nebraska / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 162, NWS North Platte, NE

August 11, 2002Boyd County, Keya Paha County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 11, 2002, 10:42 AM CDT for Boyd County, Keya Paha County, Nebraska. It was in force for 48 min. 2 reports 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, 10:42 AM CDT (15:42 UTC)
Expired: Aug 11, 2002, 11:30 AM CDT
In force: 48 min
Issued by: NWS North Platte, NE
Area: Counties, with a storm outline in the text

Counties Boyd County, NE, Keya Paha County, NE

The radar

The North Platte radar (KLNX), 160 km from the middle of the area, began a volume at 15:41 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, 10:50 AM CDT	Hail 0.75	Mills, NE
Aug 11, 11:05 AM CDT	Hail 0.75	Naper, 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 nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 3.7 hours before the alert went out and 225 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: 61 J/kg
Mixed-layer CIN: -306 J/kg
Mixed-layer LCL: 2395 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 162 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.

642 
WUUS53 KLBF 111542
SVRLBF
NEC015-103-111630-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1042 AM CDT SUN AUG 11 2002

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN KEYA PAHA COUNTY IN NORTH CENTRAL NEBRASKA...
  NORTHWESTERN BOYD COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 1130 AM CDT...

* AT 1036 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THE MOST DANGEROUS PART OF A SEVERE THUNDERSTORM 7 MILES SOUTHEAST
  OF MILLS...OR ABOUT 24 MILES EAST OF SPRINGVIEW...MOVING NORTHEAST
  AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE...

  3 MILES NORTHWEST OF NAPER AROUND 1100 AM CDT...
  15 MILES NORTHWEST OF BUTTE AROUND 1120 AM CDT...
  14 MILES NORTHWEST OF ANOKA AROUND 1125 AM CDT...

IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER IN A SMALL
INTERIOR ROOM AWAY FROM WINDOWS. A BASEMENT OFFERS THE BEST
PROTECTION.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY FOR RELAY
TO THE NATIONAL WEATHER SERVICE.

LAT...LON 4297 9946 4278 9949 4281 9928 4290 9900
          4285 9882 4309 9879 4327 9902

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, 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, 6:16 PM CDT	Tornado Warning	LBF	Thomas	29 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

Severe Thunderstorm Warnings in Nebraska, 2002 Every severe thunderstorm warning 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.