Timely and Reliable Philippine Weather Forecast

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Glossary

There are currently 17 names in this directory
ICE
The solid state of water; it is found in the atmosphere in different forms such as crystals, snow pellets etc.

ICE CRYSTALS
Frozen water vapor suspended in the air.

ICE NEEDLES
Thin crystals or shafts of ice, so light that they seem to be suspended in the air.

ICE RAIN
A rain that causes a deposit of glaze. Falling pellets of clear ice.

ICEBERG
A large mass of ice that breaks from the tongue of a glacier, runs into the sea and then floats away. Only about ten percent of it is visible.

ICEBLINK
A white, luminous appearance near the horizon caused by the reflection of light from ice.

INSOLATION
Solar radiation that has been received by the earth's surface.

INSTABILITY
A state of the atmosphere in which convection takes place spontaneously, leading to cloud formation and precipitation.

INTERTROPICAL CONVERGENCE ZONE (ITCZ)
The axis, or portion of the broad trade winds current of the tropics. This axis is the dividing line between the southeast trades and the northeast trades. It is the result of the northern hemisphere and southern hemisphere trade wind convergence which brings widespread cloudiness, occasional thunderstorms, precipitation, moderate to strong surface winds. Its occurrence is migratory, depending on the time of the year.

INVERSION
A condition in which air near the ground is cooler than air above it; a condition opposite to the concept of a normal decrease in temperature with height.

ISALLOBAR
An isogram having the same amount of change in barometric pressure within a specified period.

ISANORMAL
An isanomalous line; line of anomaly, i. e.,of the departure of the local mean value of an element from the mean pertaining to the latitude.

ISOBAR
An isogram having the same barometric pressure for a certain period.

ISOGRAM
A line drawn on a chart or diagram to show the distribution of some physical condition in space or time (or both), by connecting points corresponding to equal values of the phenomenon represented. Most of the isograms used in meteorology are drawn on geographical charts, and show the distribution of meteorological elements in space only. Also called isoline.

ISOHYET
An isogram having the same rainfall amount.

ISOPLETH
An isogram that shows the variation of an element in relation to two coordinates; one of the coordinates representing the time of the year (month), and the other usually the time of the day (hour), and sometimes space (especially altitude).

ISOTHERM
An isogram that surrounds an area with the same temperature.


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