"F"

F Designated letter for light fog. Visibility below 7 miles.
F+ Designated letter for heavy fog. Visibility 1/4 mile or less.
FA: Area Forecast for General Aviation.
Fahrenheit Temperature Scale: Named after "Daniel Gabriel Fahrenheit" a German Dutch scientiest.
32 Degrees is freezing and 212 degrees is the boiling point of water
Fair: Usually less than 3/8 opaque clouds...no precipitation...pleasant weather.
Fall: The time of the year between summer and winter.
FD: Winds & Temperature Aloft Forecasts.
Few: Less than 10% chance of precipitation.
Few Clouds:Sky cover of 1/8 to 2/8 cloud cover.
FSS: Flight Service Station. FAA
FT: Terminal Forecast.
Fetch: The process of air moving over water picking up moisture.
Few Clouds:Clouds that amount to 1/8 to 2/8 sky cover.
Field Elevation: The height in feet above sea level.
Filling:When central pressure of a cyclone rises.
F-Scale:The F-scale was devised by Professor T. Theodore Fujita of the University of Chicago.
This 6 point scale depicts the intensity for rating the strength and damage from Tornadoes.
It is based on rotational wind speeds estimated from property damage.
Flare: On the Sun a sudden eruption of energy.
Flood: A rising of water which inundates normally dry areas.
Flood Control Storage: A reservoir to store water to prevent flooding.
Flood Crest: The max height of a flood wave as it passes a designated area.
Flood Plain: The area of a river valley which has been flooded by a river over long periods of time.
Flood Potential Outlook: A forecast by the National Weather Service for the potential of flooding.
Flood Stage: The height of a river or stream when it overflows its banks.
Flood Statement: A statement issued yy the National Weather Service to inform the public of flooding problems.
Flash Flood Or Flood Watch: Flash flooding or flooding is possible.
Flash Flood Or Flood Warning: Flash flooding or flooding has been reported opr is imminent.
Flash Flood Warnings:Flash Flood Warnings are issued by the National Weather Service when heavy rains have
occurred and rising streams and rivers will produce flooding.
Fog: A cloud with its base is on the ground.
Fohen Wind: A downslope cold or warm wind which may reach up to 100 mph as is desends.

1. Fog: Adverse to aviation & auto travel.
2. FOG: Color White.
3. Fog: Disperses from the top down.
4. Fog: Forms at about 85 percent relative humidity.
5. Fog: Ground: Valley.
6. Fog: Produced when wind is 7 mph or less.
7. Fog: Radiation/Advection/Steam/Upslope.
8. Fog: Surface to 10,000 ft.

Food Calorie: Is the amount of heat required to raise the temperature of about 1 quart of water 1 deg. Celsius.

"Frequencies" 1. 10kHz - 30 kHz = Very Low Frequency. (VLF) 2. 30 kHz - 300 kHz = Low Frequensy (LF) 3. 300 kHz - 3 Mhz = Medium Frequency (MF) 4. 3 Mhz - 30 Mhz = High Frequency (HF) 5. 30 Mhz - 328.6 Mhz = Very High Frequency (VHF) 6. 328.6 Mhz - 2.9 GHz = Ultra High Frequency (UHF) 7. 2.9 GHz - 30 GHz = Super High Frequency (SHF) 8. 30 GHz & above. = Extremely High Frequency (EHF) Back To Top OF Page

Forecast: To predict the future weather
Forecast Crest: The time and height of a river or steam to to reach its creast at a given point along the river or stream.
Forecast Periods: Forecast times designated by the National Weather Service:

Today...............Sunrise to Sunset
This afternoon......Noon till 6 pm.
This evening........6 pm till sunset
Tonight.............Sunset to sunrise
Tomorrow............Sunrise to sunset of the next day

Fractocumulus Clouds: Cumulus clouds with ragged appearance.
Fractostratus Clouds: Stratus clouds which appear ragged and shredded.
Free Atmosphere: The portion of the atmosphere above the friction level: Above 3,000 feet of the surface.
Freeze: When the temperature of the surface of the earth reaches 32 degs. F.
Freezing Drizzle: Drizzle that freezeswhen hitting the ground or objects.

Freezing Level: The level in the atmosphere where the temperature is 32 Degs. F.

Freezing Level Chart: Heights of the freezing levels are in hundreds of feet.

Freezing Rain: Drizzle that freezeswhen hitting the ground or objects.
Freezing Precipitation: Precipitation that freezes on impact which formas a GLAZE on objects and the ground.
French Drain: When water passes underground trough stones placed in a trench.
Friction: The force between two objects.
Friction Level: The "Friction Level" is about 3,000 feet above the Earth's surface where there is no effect upon the wind from the surface of the Earth.

1.  Fronts. A narrow transition zone between two air masses of different densities or temperature.
2.  Fronts: Back Door Cold Front. Occurs over the Northeastern United States. When the front moves from Northeast to Southwest.
3.  Fronts: Cold Air Occlusion. Colored Purple. When cold air replaces warm air at the surface.
4.  Fronts: Cold. Blue. May move up to 60 mph. Contains usually heavy weather.
5.  Fronts: Cross Sections.Cold/Warm/Cold Air Occlusion/Warm Air Occlusion. Viewing fronts from the side.
6.  Fronts: Densities are temperature and moisture.
7.  Fronts: Drown on weather maps During WWI by Norweigin Meteorologists.
8.  Fronts: Occlude: To close or come together.
9.  Fronts: Overrunning. Warm air over cold air.
10. Fronts: Stationary. When two fronts meet and there is very little movement. Colored Red & Blue.
11. Fronts: Type of weather with each front.
12. Fronts: Warm Air Occlussion. Purple. When warm air replaces colder air.
13. Fronts: Warm Fronts form temperature inversions.
14. Fronts: Warm. Red. Moves slow. Usually Foggy Conditions.


 





15. Frontogenesis. Genesis: To begin or form. Stengthen. When weather fronts form. 
16. Frontolysis: To dissipate. Weaken. When weather fronts dissipate. 

 













Frontal Thunderstorms: Thunderstorms which occur with fronts and are more severe than air mass thunderstorms.


FROPA: Contraction in a weather observation for "Frontal Passage".

Frost: Formed when the temperature is below freezing by sublimation.
Frost Advisory: An advisory issued by the National Weather Service when the formation of frost is expected.    
Frost Bite: When human tissue is damaged by the cold.
Frostbite:The freezing of body tissue. 
Frost Line: Depth in the ground to which frost occurs.
Frost: Perma Frost: The permanent depth in the ground to which frost occurs may be 1,000 feet in the northern latitudes..
Frost Point: The temperature at which forst forms. 32 Degs. F. 0 Degs. C.


Frozen Dew: When dew freezes and changes to ice.
Frozen Precipitation: Snow/Snow Pellets/Snow Grains/Hail/Sleet (ICE PELLETS) Ice Crystals.
Funnel Cloud:A Funnel Cloud is a "Tornado" aloft before it touches the ground. 


FL:Designated letters for "Freezing Drizzle"
FR:Designated letters for "Freezing Rain"



Fujita Scale: A scale to desigante the intensity of a tornado developed by: Dr. Fujita.
EF0 (Weak).....40-72  mph.....Light Damage
EF1 (Weak).....73-112 mph.....Modewrate Damage
EF2 (Strong)...113-157 mph....Considerable Damage
EF3 (Strong)...158-206 mph....Severe Damage
EF4 (Violent)..207-260 mph....Denestating Damage
EF5 (violent)..260-318 mph....Very rare. Increadible Damage



Funnel Cloud:A tornado that does not reach or touch the ground.


FZRA:Freezing Rain.







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