Beaufort windscale презентация

Sea is like a mirror.

Слайд 2Sea is like a mirror.


Слайд 3Ripples with the appearance of scales are formed,
but without foam

crests.

Слайд 4Small wavelets, still short but more pronounced;
crests have glassy appearance and

do not break.

Слайд 5Large wavelets; crests begin to break; foam of
glassy appearance; perhaps scattered

white horses.

Слайд 6Small waves, becoming longer; fairly frequent
white horses.


Слайд 7Moderate waves, taking a more pronounced long form;
many white horses are

formed (chance of some spray).

Слайд 9Spray ..........


Слайд 10Large waves begin to form; the white foam crests are
more extensive

everywhere (probably some spray).

Слайд 11FORCE 7: NEAR GALE
MEAN WIND SPEED: 28 - 33 KNOTS

The sea

heaps up and white foam from breaking waves
begins to be blown in streaks along the direction of
the wind.

Слайд 13FORCE 8: GALE
MEAN WIND SPEED: 34 - 40 KNOTS


Moderately high waves

of greater length; edges of
the crests begin to break into spindrift; foam is blown in
well-marked streaks along the direction of the wind.

Слайд 14FORCE 9: STRONG GALE
MEAN WIND SPEED: 41 - 47 KNOTS


High waves;

dense streaks of foam along the direction
of the wind; crests of waves begin to topple, tumble
and roll over; spray may affect visibility.

Слайд 16Very high waves with long overhanging crests; foam in great patches


is blown in dense white streaks along the direction of the wind;
the surface of the sea takes a white appearance; the tumbling of
the sea becomes heavy and shocklike; visibility affected.

Слайд 18Exceptionally high waves (small and medium sized ships
might be lost to

view behind the waves); sea completely covered with long white patches of foam lying along the direction of the wind; everywhere the edges of the wave crests are blown into froth; visibility affected.


VIDEO
(click)

Phenominal
waves!!


Слайд 19


FORCE 12: HURRICANE
MEAN WIND SPEED: 64 KNOTS AND OVER

The air

is filled with foam and spray; sea completely
white with driving spray; visibility very seriously affected.

Слайд 20

FORCE 12:
Saffir/Simpson Scale - categories and damage.

Category 1: 64 - 83 knots
Damage: minimal.

Category 2 : 84 - 96 knots
Damage: moderate.

Category 3 : 97 - 113 knots
Damage: extensive.

Category 4 : 114 - 135 knots
Damage: extreme.

Category 5 : >136 knots
Damage: catastrophic.


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