Alert archive / Nebraska / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 21, NWS Omaha, NE

April 18, 2004Madison County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Apr 18, 2004, 5:59 PM CDT for Madison County, Nebraska. It was in force for 31 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, 5:59 PM CDT (22:59 UTC)
Expired: Apr 18, 2004, 6:30 PM CDT
In force: 31 min
Issued by: NWS Omaha, NE
Area: Counties, with a storm outline in the text

County Madison County, NE

The radar

The Omaha radar (KOAX), 126 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, 6:15 PM CDT	HAIL 0.75	3 E Battle Creek, 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 126 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.

563 
WUUS53 KOAX 182259
SVROAX
NEC119-182330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OMAHA NE
559 PM CDT SUN APR 18 2004

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MADISON COUNTY IN NORTHEAST NEBRASKA
  THIS INCLUDES THE CITY OF NORFOLK

* UNTIL 630 PM CDT

* AT 557 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS WITH LARGE HAIL OVER BATTLE CREEK...OR ABOUT
  11 MILES WEST OF NORFOLK...MOVING EAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NORFOLK

LARGE HAIL IS LIKELY WITH THIS STORM. GO TO A SAFE PLACE INSIDE YOUR
HOME OR BUSINESS. STAY AWAY FROM WINDOWS AND GLASS DOORS.

WINDS OF 60 TO 80 MPH ARE POSSIBLE. FOR YOUR PROTECTION...GO TO THE
LOWEST LEVEL OF YOUR HOME OR BUSINESS...AWAY FROM WINDOWS.

LAT...LON 4211 9770 4194 9776 4183 9736 4205 9736

$$

DF/CK

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, 5:57 PM CDT	Tornado Warning	OAX	Pierce	33 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

Severe Thunderstorm Warnings in Nebraska, 2004 Every severe thunderstorm warning 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.