Timely and Reliable Philippine Weather Forecast

Philippine Standard Time

Glossary

There are currently 18 names in this directory
TAIL-END OF COLD FRONT
Front boundary of 2 air masses, found in mid-latitudes. It brings rainfall and cloudiness over affected areas, and happens usually on the northern portion of the country during the Northern Hemisphere winter season.

TEMPERATE ZONE
The area of the globe between the tropics and the polar regions.

THERMOMETER
An instrument for measuring temperature; in meteorology, generally the temperature of air. Maximum and minimum thermometers indicate, respectively, the highest and lowest temperatures occurring between the times of setting the instrument. A wet-bulb thermometer is used in measuring humidity.

THUNDER
The sound emitted or produced by a lightning discharge.

THUNDERSTORM
Weather disturbance that produces, aside from wind and rain,thunder and lightning. Thunderstorms occur locally, often as episodes of cyclones, and, in common with squalls, are marked by abrupt variations in pressure, temperature, and wind.

TIDAL WAVE
The wave motion of the tides. Any unusually high water level along a shore. It usually refers to either a storm surge or tsunami.

TORNADO
A violently rotating column of air that reaches from the base of a cloud to the ground (in funnel shape). In other areas it is called a violent thundersquall.

TRACE
A precipitation amount of less than 0.005 inches. In general, an unmeasurable or insignificant small quantity.

TRACK
The direction from which the vortex or storm center has already moved.

TRADE WIND
Two belts of wind, one on either side of the equatorial doldrums in which the winds blow almost constantly from easterly quadrants.

TROPICAL CYCLONE
The general term for a cyclone that originates over the tropical oceans.

TROPICAL DEPRESSION
A tropical cyclone with winds that do not exceed 63 kph. Most common in the region of the equatorial or intertropical convergence and less frequently in the trade winds.

TROPICAL STORM
A tropical cyclone with winds of 64 to 118 kph.

TROUGH
The elongated area of low barometric pressure that generally stretches north and south. This is the line where the lowest readings of the barometer will be recorded.

TRUE NORTH
The direction from any point on the earth's surface toward the geographic North Pole.

TSUNAMI
An ocean wave produced by a submarine earthquake, landslide, or volcanic eruption that may reach enormous dimensions and have sufficient energy to travel across entire oceans.

TWILIGHT
Astronomical twilight is the interval between sunrise or sunset and the total darkness of night. Civil twilight is the period of time before sunrise or after sunset during which there is enough daylight for ordinary outdoor occupations.

TYPHOON
A tropical cyclone with winds that exceed 118 kph. The name is applied to a severe tropical cyclone in the western Pacific.


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