Subj : Wx Terms (F)(5)
To : All
From : Daryl Stout
Date : Thu Sep 07 2017 12:06 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 32�F. 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
[email protected] 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
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