A halo around the moon

Warm front approaching - Lowering of cloud base - Cirrus, cirrostratus, altostratus, nimbostratus - Surface winds back.

Stalled Wing

When the airflow is no longer moving over the top surface of the wing.2/3 lift has gone.

V.M.C below 3,000ft A.M.S.L

Depends on the airspace you're in. Class E, then 5 km clear of cloud and in sight of the ground. Class F, in sight of the ground, clear of cloud and min vis of 1500m. (Same as class G)

Q.N.H, Q.F.E

Questionble Nautical Height - Questionble field elevations

Cold Front

Clouds Cuculiform, cumulus, cu-nimbus. Drop in temp, wind veer, fall in pressure to rise once front has past.

CAVOK

Ceiling and Visibility Ok, no cloud at all below 5000 feet and vis greater than 10km (6 miles)

AIAA

Area of Intense Aerial Activity. These are marked on a chart as as a blue line made up of diamond shapes, there will also be an indication of its name and altitude restrictions. As paraglider pilots we can fly in these areas but an even better look out is required than normal as you should expect other aircraft to be around.

D306/10.0

Danger area, with designation 306 upto an altitude of 10,000 feet AMSL

MATZ dimensions

Military Aerodrome Traffic Zone: 3000feet up 5nautical miles radius plus 5nm long runway 4nm wide.

LOW PRESSURE

Rotates anti clockwise in the northern hemishere.

High Pressure

Rotates clockwise in the northern hemishere.

Buys Ballots Law

Buys Ballot's law states that, in the Northern Hemisphere, if a person stands with his back to the wind, the atmospheric pressure is low to the left and high to the right. In the Southern Hemisphere, it is reversed.