Weather A - Z (N-R)

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Weather A - Z (N-R)

Post by ICE » Fri Apr 28, 2006 9:43 am

National Hurricane Center - They issue watches, warnings, forecasts, and analyses of hazardous tropical weather.

National Weather Service - The federal agency that provides weather, hydrologic, and climate forecasts and warnings for the United States.

Nexrad - It’s the "NEXt generation weather RADar", a nationwide network of 120 Doppler radars being used by National Weather Service meteorologists to detect precipitation, to measure atmospheric motions and to issue warnings of severe weather.

Nor'easter - A powerful low-pressure system that moves north along the Atlantic Coast. It’s called a Nor’easter because the coastal winds are from the northeast. Heavy rain, snow and high surf often occur.

Occluded Front - A combination of two fronts that form when a cold front catches up and overtakes a warm front.

Overcast - When a widespread layer of clouds covers all of the sky. There may be thin or bright spots in the cloud layer, but no openings.

Overrunning - A condition that happens when an air mass moves up and over a denser air mass on the surface. This creates low clouds, fog and steady, light precipitation.

Ozone - A form of oxygen that has a weak chlorine odor. Ozone heats the upper atmosphere by absorbing ultraviolet from sunlight. In the troposphere, ozone is a pollutant, but in the stratosphere it filters out harmful ultraviolet radiation.

Precipitation - General name for water in any form falling from clouds. This includes rain, drizzle, hail, snow and sleet. Although, dew, frost and fog are not considered to be precipitation.

Radar - An electronic instrument, which determines the direction and distance of objects that, reflect radio energy back to the radar site. This is what meteorologists use to see rain or snow.

Rain - Liquid precipitation in the form of water drops that falls from clouds for several hours.

Rainbow - They are one of the most common but most spectacular sky displays. Rainbows are caused by the reflection and refraction (bending) of sunlight passing through raindrops. In heavy rains a double rainbow can often be seen. The sequence of a rainbows color is red, orange, yellow, green, blue, indigo and violet.

Relative Humidity - The ratio of water vapor contained in the air compared to the maximum amount of moisture that the air can hold at that specific temperature and pressure.

Ridge - It’s an elongated area of high pressure.

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