Alert archive / Nebraska / Tornado Warnings in 2002

Tornado Warning 6, NWS Omaha, NE

May 11, 2002Jefferson County, Nebraska

NWS Omaha, NE issued this tornado warning at May 11, 2002, 4:01 PM CDT for Jefferson County, Nebraska. It was in force for 29 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: May 11, 2002, 4:01 PM CDT (21:01 UTC)
Expired: May 11, 2002, 4:30 PM CDT
In force: 29 min
Issued by: NWS Omaha, NE
Area: Counties, with a storm outline in the text

County Jefferson County, NE

The radar

The Grand Island radar (KUEX), 117 km from the middle of the area, began a volume at 21:04 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
May 11, 2:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.0 hours before the alert went out and 149 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 550 m above ground
0-6 km bulk shear: 86 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: -31 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 
WFUS53 KOAX 112101
TOROMA
NEC095-112130-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA NE
400 PM CDT SAT MAY 11 2002

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN JEFFERSON COUNTY IN SOUTHEAST NEBRASKA

* UNTIL 430 PM CDT

* AT 358 PM CDT...RADAR INDICATED A SEVERE STORM WITH A POSSIBLE
  TORNADO. THE MOST DANGEROUS PART OF THE STORM WAS LOCATED 2 MILES
  SOUTHWEST OF ENDICOTT...OR ABOUT 24 MILES SOUTHWEST OF BEATRICE...
  MOVING EAST AT 25 MPH.

* SOME LOCATIONS AFFECTED...
  STEELE CITY...HARBINE
  DILLER

THIS REPLACES THE SEVERE THUNDERSTORM WARNING PREVIOUSLY ISSUED FOR
THE WARNED AREA.

IF YOU ARE IN THE PATH OF A TORNADO...GO TO A BASEMENT. IF A BASEMENT
IS NOT AVAILABLE...TAKE COVER IN AN INTERIOR ROOM ON THE LOWEST LEVEL
OF YOUR HOME OR BUSINESS. AVOID WINDOWS.  HAIL FROM GOLFBALL TO
BASEBALL SIZE IS ALSO LIKELY WITH THIS STORM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SATURDAY EVENING
FOR SOUTHEAST NEBRASKA.

LAT...LON 4015 9721 3999 9723 4000 9690 4020 9691

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 10:24 PM CDT	Severe Thunderstorm Warning	OAX	Gage	36 min
May 11, 2:55 AM CDT	Severe Thunderstorm Warning	OAX	Jefferson	35 min
May 11, 3:35 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson	55 min
May 11, 4:13 PM CDT	Severe Thunderstorm Warning	OAX	Gage	62 min
May 11, 4:31 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	29 min
May 11, 5:21 PM CDT	Severe Thunderstorm Warning	OAX	Pawnee	24 min
May 11, 6:26 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	64 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.