Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 22, NWS Omaha, NE

June 20, 2011Madison County, Platte County, Nebraska

NWS Omaha, NE issued this tornado warning at Jun 20, 2011, 7:29 PM CDT for Madison County, Platte County, Nebraska. It was in force for 31 min. 4 reports 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
Jun 20, 2011, 7:29 PM CDT (00:29 UTC)
Expired
Jun 20, 2011, 8:00 PM CDT
In force
31 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon

Counties Madison County, NE, Platte County, NE

What was reported inside it

TimeReportWhereRemark
Jun 20, 7:30 PM CDTTSTM WND DMGNorfolk, NEMANY TREES AND SOME POWER LINES DOWN.
Jun 20, 7:30 PM CDTHAIL 1.75Humphrey, NERELAYED BY BROADCAST MEDIA.
Jun 20, 7:38 PM CDTTSTM WND GST 63Norfolk, NEOBSERVATION AT NORFOLK AIRPORT.
Jun 20, 7:38 PM CDTHAIL 1.754 S Madison, 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.

IssuedProductOfficeLasted
Jun 20, 1:00 PM CDTTornado Watch PDSSPC10 hr
Jun 20, 6:53 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.5 hours before the alert went out and 117 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 2011-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4194 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2011-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 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
4194 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
898 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
166 m²/s²
0-3 km storm-relative helicity
182 m²/s²
Significant tornado parameter
4.6
Supercell composite
17.5

Open this sounding in Storm Lab

The text

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

358 
WFUS53 KOAX 210029
TOROAX
NEC119-141-210100-
/O.NEW.KOAX.TO.W.0022.110621T0029Z-110621T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
729 PM CDT MON JUN 20 2011

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN MADISON COUNTY IN NORTHEAST NEBRASKA...
  NORTH CENTRAL PLATTE COUNTY IN NORTHEAST NEBRASKA...

* UNTIL 800 PM CDT

* AT 727 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 8 MILES WEST OF CRESTON...OR 20 MILES NORTHWEST
  OF COLUMBUS...AND MOVING NORTH AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NORFOLK...MADISON AND BATTLE CREEK.

THE WARNED AREA INCLUDES HIGHWAY 81 IN NEBRASKA BETWEEN MILE MARKERS
133 AND 155.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA. GO TO A BASEMENT OR SMALL INTERIOR
ROOM ON THE LOWEST FLOOR!

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN OMAHA.

&&

LAT...LON 4202 9767 4209 9750 4205 9738 4165 9746
      4166 9753 4176 9765
TIME...MOT...LOC 0030Z 194DEG 26KT 4172 9750

$$

NIETFELD/BCM
2 follow-up statements
943 
WWUS53 KOAX 210040
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
740 PM CDT MON JUN 20 2011

NEC141-210050-
/O.CAN.KOAX.TO.W.0022.000000T0000Z-110621T0100Z/
PLATTE NE-
740 PM CDT MON JUN 20 2011

...THE TORNADO WARNING FOR NORTH CENTRAL PLATTE COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN OMAHA.

LAT...LON 4204 9754 4209 9750 4205 9738 4174 9744
      4174 9752 4183 9754
TIME...MOT...LOC 0040Z 195DEG 32KT 4180 9745

$$

NEC119-210100-
/O.CON.KOAX.TO.W.0022.000000T0000Z-110621T0100Z/
MADISON NE-
740 PM CDT MON JUN 20 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EASTERN MADISON COUNTY
UNTIL 800 PM CDT...

AT 737 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
DANGEROUS STORM WAS LOCATED NEAR MADISON...OR 18 MILES SOUTH OF
NORFOLK...MOVING NORTH AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  NORFOLK AND MADISON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN OMAHA.

&&

LAT...LON 4204 9754 4209 9750 4205 9738 4174 9744
      4174 9752 4183 9754
TIME...MOT...LOC 0040Z 195DEG 32KT 4180 9745

$$

NIETFELD/BCM
254 
WWUS53 KOAX 210055
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
755 PM CDT MON JUN 20 2011

NEC119-210105-
/O.EXP.KOAX.TO.W.0022.000000T0000Z-110621T0100Z/
MADISON NE-
755 PM CDT MON JUN 20 2011

...THE TORNADO WARNING FOR EASTERN MADISON COUNTY WILL EXPIRE AT 800
PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO 
WATCH REMAINS IN EFFECT.

LAT...LON 4204 9754 4209 9750 4205 9738 4174 9744
      4174 9752 4183 9754
TIME...MOT...LOC 0055Z 195DEG 32KT 4193 9740

$$

NIETFELD/BCM

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 7:12 PM CDTSevere Thunderstorm WarningOAXCass, Gage, Johnson, Lancaster, Otoe, Pawnee and 1 more48 min
Jun 20, 7:13 PM CDTSevere Thunderstorm WarningOAXAntelope, Knox32 min
Jun 20, 7:27 PM CDTSevere Thunderstorm WarningOAXCedar, Knox, Madison, Pierce, Wayne48 min
Jun 20, 7:39 PM CDTSevere Thunderstorm WarningOAXCass, Dodge, Douglas, Otoe, Sarpy, Saunders and 1 more51 min
Jun 20, 7:48 PM CDTSevere Thunderstorm WarningOAXCass, Johnson, Nemaha, Otoe, Pawnee, Richardson42 min
Jun 20, 7:50 PM CDTSevere Thunderstorm WarningOAXCedar, Knox, Wayne40 min
Jun 20, 8:01 PM CDTSevere Thunderstorm WarningOAXBurt, Cuming, Dodge, Saunders, Thurston, Washington44 min
Jun 20, 8:08 PM CDTAreal Flood AdvisoryOAXGage, Pawnee2 hr
Jun 20, 8:11 PM CDTFlash Flood WarningOAXDodge, Saunders5 hr
Jun 20, 8:16 PM CDTFlash Flood WarningOAXMadison, Platte, Stanton3 hr
Jun 20, 8:16 PM CDTSevere Thunderstorm WarningOAXBurt, Dodge, Douglas, Washington44 min
Jun 20, 8:27 PM CDTSevere Thunderstorm WarningOAXCedar, Thurston, Wayne33 min
Jun 20, 8:34 PM CDTFlash Flood WarningOAXDodge, Douglas, Washington2 hr
Jun 20, 8:37 PM CDTSevere Thunderstorm WarningOAXBurt, Cuming, Thurston, Washington38 min
Jun 20, 8:38 PM CDTAreal Flood AdvisoryOAXAntelope, Knox, Pierce6 hr
Jun 20, 8:43 PM CDTSevere Thunderstorm WarningOAXCass, Nemaha, Otoe, Sarpy62 min
Jun 20, 8:46 PM CDTSevere Thunderstorm WarningOAXNemaha, Richardson29 min
Jun 20, 8:49 PM CDTAreal Flood AdvisoryOAXCedar, Pierce, Wayne6 hr
Jun 20, 9:12 PM CDTFlash Flood WarningOAXBurt, Cuming, Thurston2 hr

Nearby

Tornado Warnings in Nebraska, 2011Every tornado warning in 2011Tornadoes in 2011

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.