A107 Weather Flashcards
Is a METAR an observation or a forecast?
Observation
Is a TAF an observation or a forecast?
Forecast
Information for a routine METAR is observed between __ minutes after the hour until ___.
45
The top of the hour
A routine METAR is reported between __ minutes after the hour and __
50
The top of the hour
A METAR provides weather information for a specific airfield out to __ statute miles
5
Are winds on a METAR measured in True or Magnetic?
True
An observation reported in a METAR as VC means ___ and is measured to be ___
Vicinity
Between 5 and 10 statute miles from the reporting station
An observation reported in a METAR as DSNT means ___ and is measured to be ___
Distant
Beyond 10 statute miles from the reporting station
A TAF is defined as ___
A concise statement of the expected meteorological conditions for a 5 statute mile radius around an airport during a specified time period (usually 24 hrs)
TAFs are prepared and filed approximately ___ prior to scheduled issuance times
One-half hour
A “FM” group is used in a TAF when…
A rapid change is expected, usually occurring in less than one hour
A “BECM” group is used in a TAF when…
A gradual change in conditions is expected over a longer time period, usually two or more hours
A “TEMPO” group is used in a TAF when…
Any conditions in wind, visibility, weather, or sky condition which are expected to last for generally less than an hour at a time.
Define Wind Shear
A sudden, drastic change in wind speed and/or direction over a very small area
A critical type of wind shear associated with convective precipitation from a thunderstorm is known as a
Microburst
A microburst typically has a horizontal diameter of __, __ minute lifespan, and downdrafts up to ___ fpm
1-2 miles
15 minutes
6000 fpm
Sky Clear, or SKC means how much of the sky is obscured due to clouds?
0/8
Few Clouds, or FEW means how much of the sky is obscured due to clouds?
1/8 - 2/8
Scattered Clouds, or SCT means how much of the sky is obscured due to clouds?
3/8 - 4/8
Broken Clouds, or BKN means how much of the sky is obscured due to clouds?
5/8 - 7/8
Overcast, or OVC means how much of the sky is obscured due to clouds?
8/8
In a TAF, the letters BR mean…?
Mist
In a TAF, the letters FG mean…?
Fog
In a TAF, the letters FU mean…?
Smoke
In a TAF, the letters DU mean…?
Dust
In a TAF, the letters SA mean…?
Sand
In a TAF, the letters HZ mean…?
Haze
In a TAF, the letters PY mean…?
Spray
In a TAF, the letters VA mean…?
Volcanic Ash
In a TAF, the letters TS mean…?
Thunderstorms
In a TAF, the letters SH mean…?
Showers
In a TAF, the letters RA mean…?
Rain
In a TAF, the letters SN mean…?
Snow
In a TAF, the letters GR mean…?
Hail
In a TAF, the letters FC mean…?
Funnel Cloud
In a TAF, the letters WS mean…?
Wind Shear
Draw the wind triangle
Magnitudes and directions of airspeed/wind speed
