Timely and Reliable Philippine Weather Forecast

Philippine Standard Time

Glossary

There are currently 10 names in this directory
OBLIQUE VISUAL RANGE
The greatest distance at which a specific target can be perceived when viewed along a line of sight inclined to the horizon.

OCCLUDED FRONT
The front that is formed when and where the cold front overtakes the warm front of the cyclone. Serves as a boundary between cold and warm air masses.

OCCLUSION
The term used to denote the process whereby the air in the warm sector of a cyclone is forced from the surface to the higher levels. The process is accompanied by an increase in the intensity of the cyclone.

OCEANOGRAPHY
The study of the oceans, embracing and integrating all knowledge pertaining to the sea's physical boundaries, the chemistry and physics of sea water, and marine biology.

OROGRAPHIC LIFTING
The upward flowing of air caused by rising terrain, such as a mountain range.

OVERCAST
Descriptive of sky cover of 1.0 (95 percent or more) when at least a portion of this amount is attributed to clouds or obscuring phenomena aloft; that is, when the total sky cover is not due entirely to surfaced-based obscuring phenomena.

OVERRUNNING
The flow of warm air over cold air in advance of a warm front.

OXYGEN
In its free form, a colorless, tasteless, and odorless gaseous element; the second most abundant gas in the earth's atmosphere and a prerequisite of virtually all forms of animal life. It is a usually a diatomic (containing two atoms) substance.

OZONE
A triatomic form of oxygen which occurs transiently in small quantities in the lower atmosphere and is supposed to be permanently present and relatively abundant at high atmospheric levels.

OZONE LAYER
Otherwise known as ozonosphere; an atmospheric layer where there is a maximum concentration of ozone which blocks most solar ultraviolet radiation from entry into the lower atmosphere.


Suggest a definition