Alert archive / Nebraska / Tornado Warnings in 2001

Tornado Warning 29, NWS Omaha, NE

May 4, 2001Johnson County, Nebraska

NWS Omaha, NE issued this tornado warning at May 4, 2001, 7:10 PM CDT for Johnson County, Nebraska. It was in force for 35 min. 2 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: May 4, 2001, 7:10 PM CDT (00:10 UTC)
Expired: May 4, 2001, 7:45 PM CDT
In force: 35 min
Issued by: NWS Omaha, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Johnson County, NE

The radar

The Omaha radar (KOAX), 106 km from the middle of the area, began a volume at 00:10 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
May 4, 7:20 PM CDT	Hail 1	Tecumseh, NE
May 4, 7:43 PM CDT	Tornado F0	Cook, NE	Brief touchdown in open country.

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

Omaha, NE (KOAX), launched 00:00Z, 0.2 hours before the alert went out and 106 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: 13 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 476 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KOAX 050013
TOROMA

NEC097-050045-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA NE
710 PM CDT FRI MAY 4 2001

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* TORNADO WARNING FOR...
  JOHNSON COUNTY IN SOUTHEAST NEBRASKA

* UNTIL 745 PM CDT

* AT 705 PM CDT...RADAR INDICATED A THUNDERSTORM WITH ROTATION AND A
  POSSIBLE TORNADO 3 MILES SOUTH OF TECUMSEH...OR ABOUT 30 MILES
  EAST OF BEATRICE...MOVING NORTH AT 35 MPH.  

* SOME LOCATIONS AFFECTED...
  TECUMSEH...COOK

THUNDERSTORMS IN THE AREA HAVE A HISTORY OF PRODUCING BRIEF 
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

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.

LAT...LON 4027 9630 4027 9607 4053 9608 4053 9633

MEAD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 7:44 PM CDT	Tornado Warning	OAX	Otoe	31 min
May 4, 7:48 PM CDT	Tornado Warning	OAX	Johnson	27 min
May 4, 8:15 PM CDT	Tornado Warning	OAX	Johnson	30 min
May 4, 8:15 PM CDT	Tornado Warning	OAX	Otoe	45 min
May 4, 8:45 PM CDT	Tornado Warning	OAX	Johnson	15 min
May 4, 9:01 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Otoe	29 min
May 4, 10:05 PM CDT	Flash Flood Warning	OAX	Johnson, Otoe	4 hr

Nearby

Tornado Warnings in Nebraska, 2001 Every tornado warning in 2001 Tornadoes in 2001

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.