Alert archive / Nebraska / Tornado Warnings in 2004

Tornado Warning 4, NWS Omaha, NE

April 18, 2004Pierce County, Nebraska

NWS Omaha, NE issued this tornado warning at Apr 18, 2004, 5:57 PM CDT for Pierce County, Nebraska. It was in force for 33 min. 1 report 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: Apr 18, 2004, 5:57 PM CDT (22:57 UTC)
Expired: Apr 18, 2004, 6:30 PM CDT
In force: 33 min
Issued by: NWS Omaha, NE
Area: Counties, with a storm outline in the text

County Pierce County, NE

The radar

The Omaha radar (KOAX), 135 km from the middle of the area, began a volume at 22:59 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
Apr 18, 6:09 PM CDT	HAIL 1	2 Se Pierce, NE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 18, 2:20 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.0 hours before the alert went out and 135 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: 256 J/kg
Mixed-layer CIN: -464 J/kg
Mixed-layer LCL: 995 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 365 m²/s²
0-3 km storm-relative helicity: 406 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.

199 
WFUS53 KOAX 182257
TOROAX
NEC139-182330-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA NE
556 PM CDT SUN APR 18 2004

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

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

* UNTIL 630 PM CDT

* AT 555 PM CDT...RADAR INDICATED A SEVERE STORM WITH A POSSIBLE
  TORNADO. THE MOST DANGEROUS PART OF THE STORM WAS LOCATED 4 MILES
  SOUTHEAST OF PIERCE...OR ABOUT 10 MILES NORTH OF NORFOLK...MOVING
  EAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
RURAL SOUTHEASTERN PIERCE COUNTY

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 4227 9757 4209 9759 4209 9736 4226 9737

$$

FOBERT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 3:44 PM CDT	Severe Thunderstorm Warning	OAX	Madison	31 min
Apr 18, 4:00 PM CDT	Severe Thunderstorm Warning	OAX	Stanton, Wayne	30 min
Apr 18, 4:45 PM CDT	Severe Thunderstorm Warning	OAX	Madison	30 min
Apr 18, 5:14 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	31 min
Apr 18, 5:26 PM CDT	Tornado Warning	OAX	Pierce	34 min
Apr 18, 5:42 PM CDT	Tornado Warning	OAX	Cedar	33 min
Apr 18, 5:50 PM CDT	Tornado Warning	OAX	Wayne	30 min
Apr 18, 5:59 PM CDT	Severe Thunderstorm Warning	OAX	Madison	31 min
Apr 18, 6:16 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	29 min
Apr 18, 6:20 PM CDT	Tornado Warning	OAX	Wayne	25 min
Apr 18, 6:29 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Platte, Stanton	46 min
Apr 18, 6:46 PM CDT	Severe Thunderstorm Warning	OAX	Wayne	44 min

Nearby

Tornado Warnings in Nebraska, 2004 Every tornado warning in 2004 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.