Timely and Reliable Philippine Weather Forecast

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Glossary

There are currently 24 names in this directory
DAILY MEAN
The average temperature for a day computed by averaging either the hourly readings or, more commonly, the maximum and minimum temperatures.

DALTON'S LAW
States that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the gases. Formulated by John Dalton, an English physicist.

DANGEROUS QUADRANT
The advance quadrant of the dangerous semi-circle. A vessel and all its attendants in bad weather re-curve over it.

DANGEROUS SEMI-CIRCLE
It is the half of the storm area in which rotary and progressive motions of the storm reinforce each other, and the winds are also directed in such a way as to drive a vessel running before the wind across the storm track ahead of the advancing center.

DEEPENING
An area of low-pressure in which storm conditions occur.

DEVIATION OF THE WIND
The angle between the direction of the wind and the direction of the pressure gradient.

DEW
Atmospheric moisture condensed, in liquid form, upon objects cooler than the air, especially at night.

DEW POINT
The temperature at which, under ordinary conditions, condensation begins in a cooling mass of air. It varies with the specific humidity. It is a conservative air mass property.

DISTURBANCE
An area of low-pressure in which storm conditions occur.

DIURNAL
Having a daily cycle, especially pertains to actions which are completed within twenty-four hours and which recur every twenty-four hours.

DIURNAL TIDE
A tide in which there is only one high water level and one low water level on a lunar day.

DIVERGENCE
The conditions that exists when the distribution of winds within a given area is such that there is a net horizontal flow of air outward from the region. The resulting deficit is compensated by a downward movement of air from above; consequently areas of divergent winds are regions unfavorable to the occurrence of precipitation.

DOCTOR
A colloquial name for the sea breeze in tropical and subtropical climates which is invigorating because of its relative coolness.

DOLDRUMS
A part of the ocean near the equator abounding in calms, squalls, and light shifting winds.

DOPPLER RADAR
Sophisticated radar that can measure the speed and direction of moving objects, such as wind.

DOWNBURST
A sudden, strong, downward blast of air, usually from a thundercloud.

DRIZZLE
Precipitation featuring tiny water droplets, no more than .02 inch in diameter. Unlike fog droplets, drizzle fall to the ground.

DRIZZLE
Precipitation featuring tiny water droplets, no more than .02 inch in diameter. Unlike fog droplets, drizzle fall to the ground.

DRIZZLE
Precipitation featuring tiny water droplets, no more than .02 inch in diameter. Unlike fog droplets, drizzle fall to the ground.

DROUGHT
Abnormally dry weather in a region over an extended period of time.

DRY FOG
A haze due to the presence of dust or smoke in the air.

DUST
Solid materials suspended in the atmosphere in the form of small irregular particles, many of which are microscopic in size.

DUST DEVIL
A small, whirling of wind that picks up dirt and other loose materials as it travels.

DYNAMIC METEOROLOGY
The branch of meteorology that studies the motions of the winds and their relation to other atmospheric phenomena.


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