Subj : Weather Terms (F) Part 5 To : All From : Daryl Stout Date : Wed Sep 07 2016 03:29 am Frostbite Human tissue damage caused by exposure to intense cold. Frozen Dew When liquid dew changes into tiny beads of ice. This occurs when dew forms and temperatures later drop below freezing. FRST Frost- Frost describes the formation of thin ice crystals on the ground or other surfaces in the form of scales, needles, feathers, or fans. Frost develops under conditions similar to dew, except the temperatures of the Earth's surface and earthbound objects falls below 32øF. As with the term "freeze," this condition is primarily significant during the growing season. If a frost period is sufficiently severe to end the growing season or delay its beginning, it is commonly referred to as a "killing frost." Because frost is primarily an event that occurs as the result of radiational cooling, it frequently occurs with a thermometer level temperature in the mid-30s. FRZ Freeze FRZN Frozen FSCBG A specific aerial spray dispersion model. The acronym comes from the names of the sponsor and developers (Forest Service, Cramer, Barry, Grim). FT Feet (or foot) FTHR Further FTPMAIL An Internet server application which provides access to Internet FTP server files via e-mail. The National Weather Service operates an FTPMAIL server which provides e-mail access to any product available on the tgftp.nws.noaa.gov FTP server including marine text and graphic forecasts. For further information see: http://weather.noaa.gov/pub/fax/ftpmail.txt, or send an e-mail to ftpmail@weather.noaa.gov with the word "help" in the body. Fugitive Dust Dust that is not emitted from definable point sources such as industrial smokestacks. Sources include open fields, roadways, storage piles, etc. Fujita Scale (or F Scale) - A scale of tornado intensity in which wind speeds are inferred from an analysis of wind damage: Rating Wind, Damage F0 (weak) 40-72 mph, light damage F1 (weak) 73-112 mph, moderate damage F2 (strong) 113-157 mph, considerable damage F3 (strong) 158-206 mph, severe damage F4 (violent) 207-260 mph, devestating damage F5 (violent) 260-318 mph (rare), incredible damage All tornadoes, and most other severe local windstorms, are assigned a single number from this scale according to the most intense damage caused by the storm. Fujiwhara Effect A binary interaction where tropical cyclones within a certain distance (300-750 nm depending on the sizes of the cyclones) of each other begin to rotate about a common midpoint. Full-Physics Numerical Model A computer model used to calculate air pollution concentrations. A full-physics numerical model uses a full set of equations describing the thermodynamic and dynamic state of the atmosphere and can be used to simulate atmospheric phenomena. Fumigation A pattern of plume dispersion produced when a convective boundary layer grows upward into a plume trapped in a stable layer. The elevated plume is suddenly brought downward to the ground, producing high surface concentrations. Funnel Cloud A condensation funnel extending from the base of a towering cumulus or Cb, associated with a rotating column of air that is not in contact with the ground (and hence different from a tornado). A condensation funnel is a tornado, not a funnel cloud, if either a) it is in contact with the ground or b) a debris cloud or dust whirl is visible beneath it. Funnelling The process whereby wind is forced to flow through a narrow opening between adjacent land areas, resulting in increased wind speed. FVT Forecast Verification Tool FWC NGM MOS Guidance FWD Forward FZRA freezing rain Posted by VPost v1.7.081019 --- Virtual Advanced Ver 2 for DOS * Origin: The Thunderbolt BBS (801:1/7) þ Synchronet þ The Curmudeon's Place .