Weather A - Z (S)

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Weather A - Z (S)

Post by ICE » Fri Apr 28, 2006 9:42 am

Saffir-Simpson Scale - A hurricane intensity scale that relates hurricane damage to wind speeds and central air pressures.

Category 1: wind speeds 74-95 m.p.h.

Category 2: wind speeds 96-110 m.p.h.

Category 3: wind speeds 111-130 m.p.h.

Category 4: wind speeds 131-155 m.p.h.

Category 5: wind speeds over 155 m.p.h.

Sandstorm - A strong wind which carries sand through the air. Usually occurs in desert regions, often among sand dunes.

Seasons - The earth's position in relation to the sun is always changing. The earth spins around its axis, an imaginary line that runs between the north and south poles. One complete spin takes 24 hours, and at any moment, half of the earth is lit and warm (day), while the other half faces away from the sun (night). While it spins the earth also moves around the sun in a circle, called an orbit, and the orbit takes one year to complete. As the earth moves and spins it is tilted in one direction at an angle of 23 degrees. It stays tilted all the time as it orbits the sun, so that each area of earth receives different amounts of the sun's energy at different times of the year. This is why we have seasons.

Severe Thunderstorm - A thunderstorm with winds of 58 mph or greater and/or with hail ¾ inch in diameter or larger.

Severe Thunderstorm Warning - It’s issued to warn the public, emergency management, and other cooperating agencies when a severe thunderstorm is forecast to occur or is occurring. The warning will include where the storm was occurring, its direction of movement and the primary threat from the storm.

Severe Thunderstorm Watch - It’s issued when conditions are favorable for the development of severe thunderstorms.

Severe Weather - Its any kind of destructive or life-threatening weather event. Thunderstorms that can be destructive, while tornadoes, high winds, hail, excessive rainfall and lightning can be life threatening.

Showers - It’s just rain falling from the sky causing puddles to form on the ground.

Shear - It’s just a variation in the wind speed and/or direction over a short distance.

Shortwave - It’s basically a trough. It’s an elongated area of low pressure. These can form stormy weather.

Sleet - Solid precipitation in the form of ice pellets form when raindrops, originating in warmer air aloft, freeze as they fall through subfreezing air near the surface of the Earth.

Sleet Warning - It’s issued when accumulations of sleet in excess of a half inch are expected. This is very rare.

Slush - It’s snow or ice on the ground that has been reduced to a soft, watery mixture by rain or warm temperatures.

Smog - It’s visible air pollution in urban areas. It looks like dirty fog in large cities.

Snow - Precipitation that is composed of white ice crystals that fall from clouds. Snow may stick together to form snowflakes, which have a hexagonal or six-sided shape.

Snow Accumulation - The actual depth of snow on the ground at any instant. This occurs during or after a snowstorm storm.

Snow Advisory - It’s issued when a snowfall is expected to exceed 2 inches but no more than 5 inches.

Snow Flurries - Brief occurrences of very light snow, which produce little or no accumulation.

Snow Showers - Brief occurrences of light to moderate snow, which could produce some snowfall accumulations.

Snowflakes - Packets of falling snow formed when at least a few ice crystals are matted together. The largest snowflakes tend to occur when temperatures are near freezing. Snowflakes have a hexagonal or six-sided shape.

Spring - The season between winter and summer. Spring officially begins in late March and lasts until late June.

Sprinkle - A very light shower of rain just barely wetting the ground.

Squall Line - A line of thunderstorms sometimes several hundred miles long that can produce strong thunderstorms and sometimes severe weather.

Stable Air - Air that is colder than its surroundings and is resistant to upward movement.

Stationary Front - A boundary between two air masses that more or less doesn’t move, but some stationary fronts can wobble back and forth for several hundred miles a day.

Storm - Any disturbed state of the atmosphere that creates unpleasant weather like rain, lightning, thunder, hail, snow, sleet, and freezing rain.

Stratus Clouds - Low-lying, gray and sheetlike clouds that often produce drizzle. Stratus clouds are a principle cloud type.

Summer - The warmest season of the year. Summer officially begins in late June and last until late September.

Sun - It’s responsible for most of the earth's weather, even though it is 93 million miles away. The sun’s intense heat gives energy to the earth's atmosphere and sets it in motion. The Sun is a star, 868,000 miles across, in the center of our solar system.

Sunrise - The time the sun appears above the horizon.

Sunset - The time the sun disappears below the horizon.

Supercell - A severe thunderstorm whose updrafts and downdrafts are in near balance for several hours. Supercells often produce large hail and tornadoes.

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