1. Altimeter............An instrument onboard an aircraft for
indicate height above the ground in feet.
(Aneroid Barometer).
2. Altimeter Setting....The value to which the altimeter is set to
indicate true altitude at the airport elevation.
3. Density Altidtde.....The altidude in the standard atmosphere where the
density is the same.
4. Flying Altitude......When air is colder than standard the altimeter
indicates higher true altitude.
5. Flying Weather.......When air is warmer than standard the altimeter
indicates lower true altitude.
6. Indicated Altitude...The altitude above Mean Sea Level (MSL) indicated
on the altimeter when set to a local altimeter
setting.
7. Pressure Altitude....The altitude in the atmosphere where the pressure
is the same.
8. True Altitude........The Actual altitude above "Mean Sea Level".
9. Airmet...............Avronyn For: AIRman's METeorological information
for pilots of light aircraft.
10. FA...................Area Forecasts.
11. FT...................Aviation Forecasts.
12..METAR................Routine scheduled weather observation.
13. NE...................On a radar chart "NO ECHOES".
14. PIBAL................Pilot Balloon sent aloft to measure wind speed
and direction.
15. RADAT................The Freezing Level.
16. Prevailing Visibility...Visibility over 1/2 of the horizon circle.
17. RVR..................Runway Visual Range.
18. SIGMET...............Acryonym For: Significant Meteorological Forecast
issued for hazardous weather.
19. Special Observations....Observations taken by desigated weather stations
for various weather changes such as: Tstorms:
Hail: Wind: Visibility: ETC.
20. Synoptic observations...Observations taken at designated weather
stations at 0000, 0600, 1200, & 1800 UTC.
21. TAF......Acryonym For: Terminal Aerodrome Forecasts.
22. TWEB.....Transcribed Weather Enroute Forecast,
"Aviation Weather"
IFR..........Instrument Flight Rules.
IFR..........Weather conditions...Ceiling less than 1,000 Ft.and/or
visibility less than 3 miles.
Marginal VFR Weather....Marginal Visual Flight Rules.
Marginal VFR Weather....Ceilings greater than or equal to 1,000 FT. to
less than or equal to 3,000 Ft.
VFR Weather.............Ceiling greater than 3,000 Ft. and visibility
greater than 5 miles.
