Weather A - Z (F-G)

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Weather A - Z (F-G)

Post by ICE » Fri Apr 28, 2006 9:54 am

Flash Flood - Sudden flooding that occurs when floodwaters rise swiftly with no warning within several hours of an intense rain. They often occur after intense rainfall from slow moving thunderstorms. In narrow canyons and valleys, floodwaters flow faster than on flatter ground and can be quite destructive.

Flash Flood Warning - It’s issued to alert the public, emergency management, and other cooperating agencies that flash flooding is in progress or is likely to happen.

Flood - It results from days of heavy rain and/or melting snows, when rivers rise and go over their banks.

Flood Plain - The lowland that borders a river, usually dry but subject to flooding when the river is high.

Flood Stage - The level at which a stream, river or other body of water begins to or will begin to leave its banks.

Fog - A cloud on the ground that reduces visibility.

Freeze - It occurs when the temperature falls below 32 degrees over a large area for an extended period of time.

Freeze Warning - It’s issued during the growing season when the temperature falls below 32 degrees over a large area for an extended period of time. A freeze can destroy crops.

Freezing Rain - Rain that falls in liquid form but freezes upon impact to form a coating of glaze on the ground and on exposed objects.

Front - A boundary between two different air masses, resulting in stormy weather. A front usually is a line of separation between warm and cold air masses.

Frost - White ice crystals that form on a surface, like the ground or leaves of a plant. Frost is created when the air temperature drops below freezing and the water vapor in the air freezes into ice crystals.

Frost Advisory - It’s issued during the growing season when a widespread frost is expected over an extensive area. Temperatures are usually in the mid 30’s.

Frostbite - It happens when you have excessive exposure to extremely cold weather. It usually affects the toes, fingers, ears, and tip of the nose. Frostbite is rendered more dangerous because there is no sensation of pain, and the victim may not even know that they have been frostbitten.

Fujita Scale - The scale that measures the strength of tornadoes based upon wind speed.

F0: winds 40-72 mph - (Light damage) Branches broken off trees

F1: winds 73-112 mph - (Moderate damage) Trees snapped and mobile home pushed off foundations

F2: winds 113-157 mph - (Considerable damage) Mobile homes demolished and trees uprooted

F3: winds 158-206 mph - (Severe damage) Trains overturned and cars lifted off the ground

F4: winds 207-260 mph - (Devastating damage) Houses leveled and cars thrown some distance

F5: winds 261-318 mph - (Incredible damage) Houses lifted and thrown some distance

Funnel Cloud - A tornado that doesn’t reach the ground. It has a rotating cone-shaped column of air extending downward from the base of a cumulonimbus or thunderstorm cloud, but whose circulation does not make contact with the ground.

Glacier - A large piece of ice that survives for many years, slowly carving out the face of earth.

Glaze - A coating of ice, usually clear and smooth, formed on exposed objects by the freezing of rain, drizzle, or fog.

Global Warming - The theory that increased concentrations of greenhouse gases are causing the Earth’s surface temperature to warm.

Greenhouse Effect - The heating effect of the Earth's atmosphere. The atmosphere acts like a greenhouse because sunlight freely passes through it and warms the surface, but the Earth's re-radiated heat is slowed in its escape from the planet back into space.

Ground Clutter - A pattern of radar echoes from stationary objects like buildings near the radar site. Ground clutter can hide or confuse precipitation echoes near the radar antenna.

Ground Fog - A shallow layer of fog on the ground that reduces visibility more in the horizontal than in the vertical.

Gulf Stream - A warm swift current in the Atlantic Ocean that flows from the Gulf of Mexico along the eastern coast of the United States and then northeast toward Europe.

Gustnado - It’s just a gust front tornado. It’s a small and weak tornado that occurs along the gust front of a thunderstorm and doesn’t stay on the ground for long periods of time.

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