Alert archive / Nebraska / Tornado Warnings in 2001

Tornado Warning 4, NWS Omaha, NE

April 8, 2001Johnson County, Nebraska

NWS Omaha, NE issued this tornado warning at Apr 8, 2001, 9:47 PM CDT for Johnson County, Nebraska. It was in force for 28 min. 1 report 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
Apr 8, 2001, 9:47 PM CDT (02:47 UTC)
Expired
Apr 8, 2001, 10:15 PM CDT
In force
28 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), 100 km from the middle of the area, began a volume at 02:50 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

TimeReportWhereRemark
Apr 8, 10:13 PM CDTHail 0.75Tecumseh, 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.

IssuedProductOfficeLasted
Apr 8, 7:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.8 hours before the alert went out and 100 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2001-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2001-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 164 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
2 J/kg
Mixed-layer CIN
-182 J/kg
Mixed-layer LCL
2153 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
164 m²/s²
0-3 km storm-relative helicity
300 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.

283 
WFUS53 KOAX 090249
TOROMA
NEC097-090315-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA NE
947 PM CDT SUN APR 8 2001

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

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

* UNTIL 1015 PM CDT

* AT 945 PM CDT...RADAR INDICATED A THUNDERSTORM WITH STRONG ROTATION
  AND A POSSIBLE TORNADO 5 MILES NORTHWEST OF TECUMSEH...OR ABOUT 27
  MILES EAST OF BEATRICE...MOVING EAST AT 35 MPH.  ANOTHER SEVERE 
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO WAS MOVING INTO THE 
  SOUTHWESTERN PART OF THE COUNTY...NEAR CRAB ORCHARD.  THIS STORM
  WAS ALSO MOVING EAST AT 35 MPH.

* SOME LOCATIONS AFFECTED...
  TECUMSEH...COOK...CRAB ORCHARD...VESTA...

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 4052 9645 4026 9645 4028 9608 4052 9611

MEAD

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 8, 7:27 PM CDTSevere Thunderstorm WarningOAXJefferson, Saline33 min
Apr 8, 7:44 PM CDTSevere Thunderstorm WarningOAXGage, Lancaster31 min
Apr 8, 7:55 PM CDTSevere Thunderstorm WarningOAXCass35 min
Apr 8, 8:01 PM CDTSevere Thunderstorm WarningOAXJefferson, Saline29 min
Apr 8, 8:10 PM CDTSevere Thunderstorm WarningOAXSarpy50 min
Apr 8, 8:13 PM CDTSevere Thunderstorm WarningOAXGage, Lancaster32 min
Apr 8, 8:26 PM CDTSevere Thunderstorm WarningOAXCass34 min
Apr 8, 8:31 PM CDTSevere Thunderstorm WarningOAXJefferson29 min
Apr 8, 8:37 PM CDTTornado WarningOAXGage23 min
Apr 8, 8:40 PM CDTFlash Flood WarningOAXLancaster3 hr
Apr 8, 8:59 PM CDTTornado WarningOAXGage31 min
Apr 8, 9:07 PM CDTSevere Thunderstorm WarningOAXJefferson23 min
Apr 8, 9:11 PM CDTSevere Thunderstorm WarningOAXGage34 min
Apr 8, 9:12 PM CDTSevere Thunderstorm WarningOAXOtoe33 min
Apr 8, 9:17 PM CDTSevere Thunderstorm WarningOAXJohnson28 min
Apr 8, 9:31 PM CDTTornado WarningOAXGage29 min
Apr 8, 10:16 PM CDTSevere Thunderstorm WarningOAXJohnson, Nemaha29 min
Apr 8, 10:46 PM CDTSevere Thunderstorm WarningOAXNemaha29 min
Apr 8, 11:11 PM CDTSevere Thunderstorm WarningOAXNemaha, Otoe34 min
Apr 8, 11:13 PM CDTSevere Thunderstorm WarningOAXGage32 min
Apr 8, 11:32 PM CDTSevere Thunderstorm WarningOAXJohnson28 min
Apr 8, 11:44 PM CDTSevere Thunderstorm WarningOAXNemaha, Otoe31 min

Nearby

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