Timely and Reliable Philippine Weather Forecast

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Glossary

There are currently 15 names in this directory
WARM AIR MASS
An air mass that is warm in relation to its neighboring air masses. The term implies that the air mass originated in latitudes lower than those in which it now finds itself and that it is, therefore, warmer than the surface over which it is moving.

WARM FRONT
The leading edge of a mass of warm air that displaces a mass of cold air.

WARNING
A message given to relate the occurrence of a threatening weather condition, as indicated by a radar or spotter; or of one that is expected to occur or strike an area very soon

WATER VAPOR
The invisible gaseous form of water.

WATERSPOUT
A tornado-like vortex and cloud occurring over a body of water, frequently in tropical waters.

WAVE
A small cyclonic circulation in the early stages of development that moves along a cold front.

WAVE DISTURBANCE
A localized deformation of a front, which travels along the front as a wave-shaped formation, which generally develops into a well-marked cyclone.

WEATHER
The specific conditions of the atmosphere at a particular place and time. It is measured in terms of such parameters as wind, temperature, humidity, atmospheric pressure, cloudiness and precipitation. In most places, weather can change from hour to hour and season to season.

WEATHER FORECAST
A forecast of the future state of the atmosphere with specific reference to one or more associated weather elements.

WESTERLIES
The dominant west-to-east motion of the atmosphere, centered over the middle latitudes of both hemispheres.

WIND
Air in motion that moves horizontally in relation to the surface of the Earth. Vertical streams of air are usually called currents.

WIND DIRECTION
The direction from which the wind is blowing.

WIND SHEAR
A sudden shift in wind direction.

WINDCHILL FACTOR
A measure of the effect of wind in increasing the heat loss from exposed flesh.

WINTER SOLSTICE
The Southern Hemisphere has its maximum exposure to the sun. It occurs just a few days before perihelion and the sun is directly overhead at noon in latitude 23 1/2°S. This occurrence brings about the shortest daylight hours in the Northern Hemisphere and the longest daylight hours in the Southern Hemisphere. Happens around December 21.


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