Alert archive / Nebraska / Tornado Warnings in 2004

Tornado Warning 13, NWS Omaha, NE

May 9, 2004Knox County, Nebraska

NWS Omaha, NE issued this tornado warning at May 9, 2004, 8:02 PM CDT for Knox County, Nebraska. It was in force for 28 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 9, 2004, 8:02 PM CDT (01:02 UTC)
Expired
May 9, 2004, 8:30 PM CDT
In force
28 min
Issued by
NWS Omaha, NE
Area
Counties, with a storm outline in the text

County Knox County, NE

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 9, 3:30 PM CDTSevere Thunderstorm WatchSPC6 hr
May 9, 7:55 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.0 hours before the alert went out and 186 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 2004-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1885 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 2004-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.193958Sfc1 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
1885 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
1674 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.2
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

473 
WFUS53 KOAX 100102
TOROAX
NEC107-100130-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA NE
800 PM CDT SUN MAY 9 2004

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* TORNADO WARNING FOR...
  KNOX COUNTY IN NORTHEAST NEBRASKA

* UNTIL 830 PM CDT

* AT 759 PM CDT...A SPOTTER REPORTED A TORNADO 1 MILES WEST OF   
CREIGHTON...OR ABOUT 36 MILES EAST OF ONEILL...MOVING EAST AT 25   
MPH.

* LOCATIONS IMPACTED INCLUDE...
  RURAL SOUTHERN KNOX COUNTY
  BLOOMFIELD

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 4247 9814 4234 9797 4259 9759 4274 9781

$$

ZAPOTOCNY

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 7:24 PM CDTSevere Thunderstorm WarningOAXKnox66 min
May 9, 7:49 PM CDTSevere Thunderstorm WarningOAXAntelope56 min
May 9, 7:59 PM CDTSevere Thunderstorm WarningOAXCedar61 min
May 9, 8:31 PM CDTSevere Thunderstorm WarningOAXKnox44 min
May 10, 12:19 AM CDTSevere Thunderstorm WarningOAXSeward41 min
May 10, 2:32 AM CDTSevere Thunderstorm WarningOAXOtoe43 min

Nearby

Tornado Warnings in Nebraska, 2004Every tornado warning in 2004Tornadoes in 2004

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.