Sunnyvale and Los AltosTornado Damage

All pictures taken by John Monteverdi unless otherwise noted.

According to the survey and the F-Scale Limits Given below, the Sunnyvale, May 4, 1998 Tornado was an F2.  Other pictures to appear soon.  Some pictures did not come out, including two vehicles in driveway, lifted and rotated 90 degrees and pushed against garage door.

 

 Damage Path Projected on Aircraft Image of Sunnyvale
(Click on Image for Larger Version) (Graphic by Karl Anderson)

 

  Damage Path Projected on Aircraft Image of Los Altos
(Click on Image for Larger Version) (Graphic by Karl Anderson)

Los Altos F1 Tornado--Damage Photos From Los Altos High School

Click on Small Pictures To See Full Sized Images.

Interior of Garage on Remington.

The roof has been lifted from the rafters.  The roof had been clipped to the rafers. 

1 1/2 Foot Diameter Tree Uprooted

This was on Bernardo St. This is root ball; tree fell to left.

Damaged Houses and Downed Trees on Remington

Image is dark.  Tried to lighten it.

Crushed Shed on Remington

Came from corner of Bernardo and Plymouth.  Flung 1 block.

A Large Tree as Missile

Hit this garage door and crumpled it on Remington.

1 Foot Diameter Tree Uprooted

This was on Remington St.

Partial Deroofing

This was one of several houses that lost all or part of a roof.

Roof Leaning On Tree

This was on Remington St.

Roof on Front Yard And House Damage

This was on Remington St.

Another One Foot Dameter Tree

This was on Remington St.

The Fujita Scale

F-Scale Number

Intensity Phrase

Wind Speed Type of Damage Done
F0

Gale tornado

40-72 mph Some damage to chimneys; breaks branches off trees; pushes over shallow-rooted trees; damages sign boards.
F1

Moderate tornado

73-112 mph The lower limit is the beginning of hurricane wind speed; peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the roads; attached garages may be destroyed.
F2

Significant tornado

113-157 mph Considerable damage. Roofs torn off frame houses; mobile homes demolished; boxcars pushed over; large trees snapped or uprooted; light object missiles generated.
F3

Severe tornado

158-206 mph Roof and some walls torn off well constructed houses; trains overturned; most trees in fores uprooted
F4

Devastating tornado

207-260 mph Well-constructed houses leveled; structures with weak foundations blown off some distance; cars thrown and large missiles generated.
F5

Incredible tornado

261-318 mph Strong frame houses lifted off foundations and carried considerable distances to disintegrate; automobile sized missiles fly through the air in excess of 100 meters; trees debarked; steel re-inforced concrete structures badly damaged.
F6

Inconceivable tornado

319-379 mph These winds are very unlikely. The small area of damage they might produce would probably not be recognizable along with the mess produced by F4 and F5 wind that would surround the F6 winds. Missiles, such as cars and refrigerators would do serious secondary damage that could not be directly identified as F6 damage. If this level is ever acheived, evidence for it migh only be found in some manner of ground swirl pattern, for it may never be identifiable through engineering studies


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