There are 38 names in this directory beginning with the letter F.Fahrenheit
The standard scale used to measure temperature in the United States; in which the freezing point of water is thirty- two degrees and the boiling point is two hundred and twelve degrees.
Fair
Describes weather in which there is less than 4/10ths of opaque cloud cover, no precipitation, and there is no extreme visibility, wind or temperature conditions.
Feeder Bands
Lines or bands of low-level clouds that move (feed) into the updraft region of a thunderstorm, usually from the east through south (i.e., parallel to the inflow). This term also is used in tropical meteorology to describe spiral- shaped bands of convection surrounding, and moving toward, the center of a tropical cyclone
Fetch
The area in which ocean waves are generated by the wind. Also refers to the length of the fetch area, measured in the direction of the wind.
Flanking Line
A line of cumulus connected to and extending outward from the most active portion of a parent cumulonimbus, usually found on the southwest side of the storm. The cloud line has roughly a stair step appearance with the taller clouds adjacent to the parent cumulonimbus. It is most frequently associated with strong or severe thunderstorms.
Flash Flood
A flood that occurs within a few hours (usually less than six) of heavy or excessive rainfall, dam or levee failure or water released from an ice jam.
Flash Flood Warning
Issued to inform the public, emergency management, and other cooperating agencies that flash flooding is in progress, imminent, or highly likely.
Flash Flood Watch
Issued to indicate current or developing hydrologic conditions that are favorable for flash flooding in and close to the watch area, but the occurrence is neither certain or imminent.
Flood
A condition that occurs when water overflows the natural or artificial confines of a stream or river; the water also may accumulate by drainage over low- lying areas.
Flood Stage
The stage at which water overflowing the banks of a river, stream or body of water begins to cause damage.
Flood Warning
Issued when there is expected inundation of a normally dry area near a stream, other water course; or unusually severe ponding of water.
Flurries
Light snow falling for short durations. No accumulation or just a light dusting is all that is expected.
Foehn
A warm dry wind on the lee side of a mountain range. The heating and drying are due to adiabatic compression as the wind descend downslope.
Fog
Water that has condensed close to ground level, producing a cloud of very small droplets that reduces visibility to less than one km (three thousand and three hundred feet).
Fogbow
A rainbow that has a white band that appears in fog, and is fringed with red on the outside and blue on the inside.
Forecast
A forecast provides a description of the most significant weather conditions expected during the current and following days. The exact content depends upon the intended user, such as the Public or Marine forecast audiences.
Freeze
Occurs when the surface air temperature is expected to be 32 degrees Fahrenheit or below over a widespread area for a significant period of time.
Freeze Warning
Issued during the growing season when surface temperatures are expected to drop below freezing over a large area for an extended period of time, regardless if frost develops or not.
Freezing Drizzle
Drizzle that falls in liquid form and then freezes upon impact with the ground or an item with a temperature of 32 degrees Fahrenheit or less, possibly producing a thin coating of ice. Even in small amounts, freezing drizzle may cause traveling problems.
Freezing fog
A suspension of numerous minute ice crystals in the air, or water droplets at temperatures below 0 Celsius, based at the Earth's surface, which reduces horizontal visibility; also called ice fog.
Freezing Rain
Rain that freezes on objects such as trees, cars and roads, forming a coating or glaze of ice. Temperatures at higher levels are warm enough for rain to form, but surface temperatures are below 32 degrees Fahrenheit, causing the rain to freeze on impact.
Freshet
The annual spring rise of streams in cold climates as a result of snow melt; freshet also refers to a flood caused by rain or melting snow.
Front
The boundary or transition zone between two different air masses. The basic frontal types are cold fronts, warm fronts and occluded fronts.
Frost
The formation of thin ice crystals on the ground or other surfaces. Frost develops when the temperature of the exposed surface falls below 32 degrees Fahrenheit and water vapor is deposited as a solid.
Frost Advisory
Issued during the growing season when widespread frost formation is expected over an extensive area. Surface temperatures are usually in the mid 30s Fahrenheit.
Frost Point
When the temperature to which air must be cooled to in order to be saturated is below freezing.
Frozen Dew
When liquid dew changes into tiny beads of ice. The change occurs after dew formation and then the temperature falls below freezing.
Fujita Scale
System developed by Dr. Theodore Fujita to classify tornadoes based on wind damage. Scale is from F0 for weakest to F5 for strongest tornadoes.
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Fahrenheit
The standard scale used to measure temperature in the United States; in which the freezing point of water is thirty- two degrees and the boiling point is two hundred and twelve degrees.
Fair
Describes weather in which there is less than 4/10ths of opaque cloud cover, no precipitation, and there is no extreme visibility, wind or temperature conditions.
Feeder Bands
Lines or bands of low-level clouds that move (feed) into the updraft region of a thunderstorm, usually from the east through south (i.e., parallel to the inflow). This term also is used in tropical meteorology to describe spiral- shaped bands of convection surrounding, and moving toward, the center of a tropical cyclone
Fetch
The area in which ocean waves are generated by the wind. Also refers to the length of the fetch area, measured in the direction of the wind.
Flanking Line
A line of cumulus connected to and extending outward from the most active portion of a parent cumulonimbus, usually found on the southwest side of the storm. The cloud line has roughly a stair step appearance with the taller clouds adjacent to the parent cumulonimbus. It is most frequently associated with strong or severe thunderstorms.
Flash Flood
A flood that occurs within a few hours (usually less than six) of heavy or excessive rainfall, dam or levee failure or water released from an ice jam.
Flash Flood Warning
Issued to inform the public, emergency management, and other cooperating agencies that flash flooding is in progress, imminent, or highly likely.
Flash Flood Watch
Issued to indicate current or developing hydrologic conditions that are favorable for flash flooding in and close to the watch area, but the occurrence is neither certain or imminent.
Flood
A condition that occurs when water overflows the natural or artificial confines of a stream or river; the water also may accumulate by drainage over low- lying areas.
Flood Stage
The stage at which water overflowing the banks of a river, stream or body of water begins to cause damage.
Flood Warning
Issued when there is expected inundation of a normally dry area near a stream, other water course; or unusually severe ponding of water.
Flurries
Light snow falling for short durations. No accumulation or just a light dusting is all that is expected.
Foehn
A warm dry wind on the lee side of a mountain range. The heating and drying are due to adiabatic compression as the wind descend downslope.
Fog
Water that has condensed close to ground level, producing a cloud of very small droplets that reduces visibility to less than one km (three thousand and three hundred feet).
Fogbow
A rainbow that has a white band that appears in fog, and is fringed with red on the outside and blue on the inside.
Forecast
A forecast provides a description of the most significant weather conditions expected during the current and following days. The exact content depends upon the intended user, such as the Public or Marine forecast audiences.
Freeze
Occurs when the surface air temperature is expected to be 32 degrees Fahrenheit or below over a widespread area for a significant period of time.
Freeze Warning
Issued during the growing season when surface temperatures are expected to drop below freezing over a large area for an extended period of time, regardless if frost develops or not.
Freezing Drizzle
Drizzle that falls in liquid form and then freezes upon impact with the ground or an item with a temperature of 32 degrees Fahrenheit or less, possibly producing a thin coating of ice. Even in small amounts, freezing drizzle may cause traveling problems.
Freezing fog
A suspension of numerous minute ice crystals in the air, or water droplets at temperatures below 0 Celsius, based at the Earth's surface, which reduces horizontal visibility; also called ice fog.
Freezing Rain
Rain that freezes on objects such as trees, cars and roads, forming a coating or glaze of ice. Temperatures at higher levels are warm enough for rain to form, but surface temperatures are below 32 degrees Fahrenheit, causing the rain to freeze on impact.
Freshet
The annual spring rise of streams in cold climates as a result of snow melt; freshet also refers to a flood caused by rain or melting snow.
Front
The boundary or transition zone between two different air masses. The basic frontal types are cold fronts, warm fronts and occluded fronts.
Frost
The formation of thin ice crystals on the ground or other surfaces. Frost develops when the temperature of the exposed surface falls below 32 degrees Fahrenheit and water vapor is deposited as a solid.
Frost Advisory
Issued during the growing season when widespread frost formation is expected over an extensive area. Surface temperatures are usually in the mid 30s Fahrenheit.
Frost Point
When the temperature to which air must be cooled to in order to be saturated is below freezing.
Frozen Dew
When liquid dew changes into tiny beads of ice. The change occurs after dew formation and then the temperature falls below freezing.
Fujita Scale
System developed by Dr. Theodore Fujita to classify tornadoes based on wind damage. Scale is from F0 for weakest to F5 for strongest tornadoes.