Timely and Reliable Philippine Weather Forecast

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Glossary

There are currently 31 names in this directory
SATURATION
The condition that exists in the atmosphere when the partial pressure exerted by the water vapor present is equal to the maximum vapor pressure possible at the prevailing temperature.

SEA BREEZE
The breeze that, on certain coasts and under certain conditions, blows from the water; by day.

SEASON
A division of the year according to some regularly recurring phenomena, usually astronomical or climatic.

SHEAR
The variation of vector field along a given direction in space. The most frequent context for this concept is wind shear.

SHOWER
A snowfall or rainfall, of short duration but often of considerable intensity, and usually consisting of relatively large drops. Also a similar fall of sleet, or hail. Showers characteristically fall from the isolated clouds separated from one another by clear spaces. They occur typically in air masses that possess a high degree of instability.

SLEET
Precipitation consisting of ice particles formed when raindrops freeze.

SMOG
Air pollution caused by a mixture of smoke and fog.

SNOW
Precipitation in the form of small ice crystals, falling either separately or in loosely coherent clusters (snowflakes).

SOFT HALL
White, opaque, round pellets of snow.

SOLAR CONSTANT RADIATION
The intensity of solar radiation outside the Earth's atmosphere at the Earth's mean distance from the sun. Findings indicate that this intensity may vary and that its mean value is 1.94 gram-calories per minute per square centimeter of area lying normal to the incident solar ray.

SOLAR ENERGY
The energy produced by the sun.

SOLSTICE
The time of year when the sun is the farthest north or the farthest south (about June 21 and December 21). The time of year when there exists the largest difference between the hours of daytime and nighttime at certain latitudes.

SOUNDING BALLOON
A free, unmanned balloon carrying a set of self-registering meteorological instruments.

SOUTHWEST MONSOON
Locally known as "Habagat", it affects the country from July to September, is very warm and humid, occurs when warm moist air flows over the country from the southwest direction, is characterized by heavy rainfall that may last for a week. It brings the rainy season to the western portion of the country.

SPECIFIC HUMIDITY
The mass of water vapor contained in a unit mass of moist air.

SPRING TIDE
Tide near the time of syzygy, when ranges between high tide and low tide are greatest.

SQUALL
A sudden storm of brief duration; closely akin to thunderstorm but not necessarily attended by thunder and lightning. A sudden brief blast of wind, of longer duration than a gust.

SQUALL LINE
A line of thunderstorms that forms along a front.

ST. ELMO'S FIRE
A luminous brush discharge of electricity from elevated objects, such as the masts and yardarms of ships, lightning rods, steeples, etc., occurring in stormy weather.

STABLE AIR
Air in which temperature and humidity at various levels discourage the formation of convection currents.

STATIONARY FRONT
The border between cold and warm air masses that is not moving.

STORM
A marked disturbance in the normal state of the atmosphere. The term is often applied to a disturbance in which strong wind is the most prominent characteristic, and specifically to a wind force of 11 on the Beaufort scale. It is also used for other types of disturbance, including thunderstorms, rainstorms, snowstorms, hailstorms, dust storms, sand storms, magnetic storms, etc.

STORM TRACK
The path that storms generally follow in a given time.

STRATIFORM
A general term applied to all clouds which are arranged in unbroken horizontal layers or sheets.

SUBLIMATION
The change of water vapor directly into ice crystals or ice crystals directly into water vapor.

SUBSIDENCE
The word used to denote a slow downward motion of air over a large area. Subsidence accompanies divergence in the horizontal motion of the lower layers of the atmosphere.

SUMMER SOLSTICE
Occurs just a few days before aphelion. The sun is directly overhead at noon in latitude 23 1/2°N, and with regards to the amount of daylight hours, the Northern Hemisphere experiences the longest daylight hours and the Southern Hemisphere the shortest. Happens around June 21.

SURGE
A general change in barometric pressure apparently superposed upon cyclonic and normal diurnal changes.

SYNOPTIC CHART
A chart, such as the ordinary weather map, which shows the distribution of meteorological conditions over an area at a given moment.

SYNOPTIC METEOROLOGY
The branch of meteorology that deals with the analysis of meteorological observations made simultaneously at a number of points in the atmosphere (at the ground or aloft) over the whole or a part of the earth, and the application of the analysis to weather forecasting and other problems.

SYZYGY
The points in the moon's orbit about the earth at which the moon is new or full. At this time also the moon, earth and sun forms a nearly straight-line configuration.


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