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Omaha, Nebraska
Serving Eastern Nebraska and Southwest Iowa
On the World Wide Web at:
http://www.crh.noaa.gov/oax/

000
ABUS34 KOMA 252137 CCA
PNSOMA

PUBLIC INFORMATION STATEMENT...CORRECTION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
400 PM CDT TUE MAY 25 2004

... DAMAGE SURVEY REPORT ON THE HALLAM NEBRASKA TORNADO ...

A SURVEY WAS CONDUCTED BY THE NATIONAL WEATHER SERVICE IN VALLEY,NE 
OF THE TORNADO THAT STRUCK HALLAM ON SATURDAY,MAY 22ND.  THE 
FOLLOWING IS AN OVERVIEW OF DAMAGE ALONG THE TRACK.

THE TORNADO STARTED 2 MILES NORTH OF DAYKIN,NE AND TRAVELED 
EAST-NORTHEAST TO ABOUT 1 MILE SOUTH OF WESTERN AND CONTINUED TO 
ABOUT 2 MILES NORTH OF SWANTON.  THE TORNADO WAS RATED F0 TO F1 ON 
THE FUJITA DAMAGE SCALE IN THIS SECTION. MUCH OF THE DAMAGE WAS DUE 
TO FARM OUTBUILDINGS,GRAIN BINS AND TREES.  THE TORNADO REMAINED F0 
TO F1 UNTIL IT STRUCK THE SOUTHERN PORTIONS OF WILBER WHERE IT 
STRENGHTHENED TO F2.   ROOFS BLOWN OFF OF HOMES OCCURRED JUST 
SOUTHEAST OF WILBER.  

THE TORNADO FROM WILBER TO NORTH OF CLATONIA TO HALLAM GREW TO ITS 
MOST INTENSE STAGE.  THE TORNADO'S PATH WIDTH ALSO INCREASED TO AN 
UNPRECIDENTED TWO AND ONE-HALF MILES.  THE F-SCALE RATING FOR THE 
STORM WAS F4 FROM ABOUT CLATONIA TO HALLAM.  MANY WELL-BUILT HOMES 
WERE DEMOLISHED.  GRAIN BINS,FARM SHEDS AND OUTBUILDINGS,AND TREES 
WERE DEMOLISHED ALONG THIS SECTION OF THE PATH.  HALLAM ITSELF 
ESCAPED THE STRONGEST WINDS OF THE STORM,WHICH WERE SOUTH OF THE 
TOWN.  NEVERTHELESS,MANY OF THE STRUCTURES IN HALLAM WERE RATED F2 
TO F3.   THE STORM ALSO TOPPLED HOPPER CARS FROM A FREIGHT TRAIN ON 
THE WEST SIDE OF THE TOWN.  

THE TORNADO THEN TRACKED EAST FOR SEVERAL MILES PRIOR TO TURNING 
NORTHEAST AGAIN.  THE STORM NARROWED TO ABOUT A MILE WIDE AS IT 
PASSED JUST NORTH OF CORTLAND AND ABOUT 2 MILES NORTH OF FIRTH.  THE 
NORRIS SCHOOLS NORTH OF FIRTH RECEIVED SEVERE DAMAGE WITH THE ROOF 
OF THE MIDDLE SCHOOL AUDITORIUM COLLAPSED AND SEVERAL WALLS CAVED 
IN.  SCHOOL BUSSES WERE TOSSED.  SEVERAL HOMES NORTHEAST OF THE 
SCHOOLS WERE FLATTENED WHERE THE STORM WAS AGAIN RATED F4.  

DAMAGE CONTINUED NORTHEAST TO HOLLAND AND 2 MILES NORTH OF PANAMA.
THE TORNADO WAS SLGHTLY WEAKER IN THIS SECTION (F2 AT THE MOST) AND 
BEGAN TO NARROW.  THE TRACK THEN CURVED MORE TO THE NORTH, JUST TO 
THE SOUTH OF BENNET WHERE SOME HOMES RECEIVED F3 DAMAGE.  AFTER 
PASSING TO THE SOUTH OF BENNET, THE STORM MOVED BACK TO THE 
NORTHEAST AND BEGAN TO WEAKEN TO F0 TO F1 STRENGTH.   THE TRACK ALSO 
WAS BECOMING NARROWER.  THE TORNADO THEN DISSIPATED 1 MILE WEST OF 
PALMYRA.

IN SUMMARY.

F-SCALE RATING:        F4
PATH LENGTH:           52 MILES
MAXIMUM PATH WIDTH:    2 1/2  MILES 

THE FUJITA DAMAGE SCALE IS AS FOLLOWS:

F0       LESS THAN 73 MPH         CHIMNEYS DAMAGED, TREES BROKEN 

F1       73-112   MPH             MOBILE HOMES MOVED                 
                                  OFF FOUNDATIONS OR OVERTURNED
                                                          
F2       113-157 MPH              CONSIDERABLE DAMAGE, MOBILE HOMES 
                                  DEMOLISHED, TREES UPROOTED 

F3       158-206  MPH             ROOF AND WALLS TORN DOWN, TRAINS  
                                  OVERTURNED, CARS THROWN 

F4       207-260  MPH             WELL-CONSTRUCTED WALLS LEVELED 

F5       261-318  MPH             HOMES LIFTED OFF FOUNDATIONS      
                                  AND CARRIED SOME DISTANCE, CARS 
                                  THROWN A LONG DISTANCE.


MORE INFORMATION AND PICTURES WILL BE POSTED ON THE NATIONAL WEATHER 
SERVICE WEB SITE AT   WWW.CRH.NOAA.GOV/OAX/


BRIAN E. SMITH
WARNING COORDINATION METEOROLOGIST
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE

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