Timely and Reliable Philippine Weather Forecast

Philippine Standard Time

Glossary

There are currently 8 names in this directory
NAUTICAL MILE
The length of one minute of arc along any great circle on the earth's surface. Since this actual distance varies slightly with altitude, a nautical mile by international agreement is defined as 1852 meters (6076.103 feet or 1.1508 statue miles).

NAVIGABLE SEMI-CIRCLE
A vessel situated in this semi-circle may safely run before the wind, because she is then moving away from the storm.

NEAP TIDE
A tide of minimum range, occurring twice a month one or two days after quadrature.

NEAR-EARTH OBJECTS (NEO)
These are comets and asteroids that have been nudged by the gravitational attraction of nearby planets into orbits that allow them to enter the Earth's neighborhood. Composed mostly of water ice with embedded dust particles, comets originally formed in the cold outer planetary system while most of the rocky asteroids formed in the warmer inner solar system between the orbits of Mars and Jupiter.

NEPHOSCOPE
An instrument for measuring the speed and movement of clouds.

NORMAL
The average value of a meteorological element over any fixed period of years that is recognized as standard for a country and element concerned; usually a 30-year period as recommended by the World Meteorological Organization (WMO). Also known as climatological normal.

NORTHEAST MONSOON
Locally known as "Amihan". It affects the eastern portions of the country from October up to late March, starts over Siberia as a cold, dry air mass but gathers moisture as it travels across the Pacific Ocean before reaching the eastern sections of the Philippines is characterized by widespread cloudiness with rains and showers. The North Pacific Trades gradually replaces the NE Monsoon in March, appears in all seasons and blows dominantly from March to April, giving strong convective activity.

NUMERICAL FORECASTING
Forecasting the weather through digital computation carried by supercomputers.


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