TAF
Extreme Weather
Clouds, Ceilings, & Visibility
Stable v. Unstable
100

SHRA stands for

rain showers

100

Who are SIGMETS/AIRMETS issued for?

all pilots

100
Define cloud ceiling

lowest broken or overcast layer or vertical
visibility into an obscuration

100

AN AIR MASS MOVING INLAND FROM THE COAST
IN WINTER IS LIKELY TO RESULT IN

fog

200

P6SM stands for

visibility greater than 6 SM

200

Effect of freezing temperatures on aircraft performance

decrease

200

Lenticular clouds =

strong turbulence

200

Unstable air characteristics 

Cumuliform clouds
Turbulent air
Good visibility

Showery precipitation

300

When is this TAF valid from?

1218/1324

12th 1800z to 13th 2400z

300

Most hazardous type of thunderstorm for pilots

squall line

300

Nimbus =

rain/precipitation

300

Stable air characteristics

Stratiform clouds
Turbulent air
good visibility
precipitation

400

VRB06KT means what

variable wind at 6 knots

400

Conditions necessary for a thunderstorm to form

lifting force, high humidity, unstable conditions

400

How far below the clouds must you stay when flying a drone?

500 ft

400

Cloud type associated with stable air?

Stratiform

500

What is the the only cloud type reported on a TAF?

Cumulonimbus

500

What thunderstorm stage is mostly characterized by downdrafts?

dissipating stage

500

Ceiling conditions can be calculated by

temperature & dew point

500

Cloud type associated with unstable air?

Cumulus

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