Timely and Reliable Philippine Weather Forecast

Philippine Standard Time

Glossary

There are currently 15 names in this directory
BACK-DOOR COLD FRONT
A cold front that moves in from the northeast, rather than from the normal north or northwest direction.

BACKING
A counterclockwise shift in the wind direction in the Northern Hemisphere at a certain location. In the Southern Hemisphere, it is clockwise. This can either happen in the horizontal or the vertical (with height). For example, the wind shifts from the northeast to the north to the northwest. It is the opposite of veering.

BACKING WIND
Shifting of the wind in a counterclockwise direction, usually resulting from the approach of a low-pressure system.

BACKSCATTER
A radar echo that is reflected, or scattered, at 180 degrees to the direction of the incident wave. Also the scattering of radiant energy into space before it reaches the earth's surface.

BAGYO
A Filipino word for a tropical cyclone.

BAROGRAPH
An instrument that provides a continuous record of atmospheric pressure.

BAROMETER
An instrument for measuring the pressure of the atmosphere. The two principal types are the mercury barometer and the aneroid barometer.

BAROMETRIC TENDENCY
The amount and direction of change in barometer readings over a three-hour period.

BEAUFORT WIND SCALE
A system used to classify wind speed, indicated by numbers from 0 to 12. It was developed in 1805 by British Admiral Francis Beaufort.

BISHOP RING
A faint, broad, reddish-brown corona occasionally seen in dust clouds, especially those which result from violent volcanic eruptions. It has been seen after certain great volcanic eruptions, especially that of Krakatoa, in 1883.

BLIZZARD
A violent, intensely strong cold wind, laden with snow.

BREAK
A sudden change in the weather; usually applied to the end of an extended period of unusually hot, cold, wet, or dry weather.

BREEZE
A light wind with a speed ranging from 4 to 27 knots (4 to 31 mph or 6 to 50 kph).

BRINE
Sea water containing a higher concentration of dissolved salt than that normally found in the ocean. Brine is produced by evaporation or freezing of sea water.

BUYS BALLOT'S LAW
In the Northern Hemisphere, if you face the wind the atmospheric pressure decreases towards your right and increases towards your left. The reverse is true in the Southern Hemisphere. The law is useful in locating centers of cyclones and anticyclones.


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