Climate, Weather, and Geography

QFF is the pressure value plotted on weather charts in meteorological offices. It represents pressure reduced to mean sea level using actual temperature conditions (not ISA). QNH uses ISA conditions, QFE is aerodrome pressure, and QNE is pressure at the transition altitude.

Diurnal (daily) temperature variation is less over sea than over land. Water has high specific heat capacity, so it heats and cools slowly, moderating temperature changes. Land has low heat capacity, causing larger daily temperature swings. The correct answer is 'lesser'.

Cold air is denser than warm air, which creates more stable atmospheric conditions. This density difference reduces air movement, resulting in lighter or calmer winds compared to warm regions where stronger convection currents develop.

The minimum daily temperature occurs around sunrise because this is when the Earth's surface has cooled through the night without incoming solar radiation to warm it. Once the sun rises, temperatures begin increasing again.

Most atmospheric processes occur over timescales too short for significant heat exchange with the surroundings. As air parcels rise, cool, and compress, these changes happen primarily through pressure and volume changes rather than heat transfer, making them adiabatic processes.

When Environmental Lapse Rate equals Dry Adiabatic Lapse Rate, a displaced air parcel will have the same temperature as its surroundings at all levels. Since there's no temperature difference to create buoyancy, the parcel remains in its new position, defining neutral atmospheric stability.

The troposphere is the lowest layer of Earth's atmosphere, extending up to about 10-15 km from the surface. It contains about 75% of the atmosphere's mass and water vapor, making it the layer where virtually all weather phenomena occur.

Thunderstorms are most likely during summer afternoons (around noon) when maximum surface heating occurs. This heating creates strong convection currents, causing warm moist air to rise rapidly and form cumulonimbus clouds, leading to thunderstorm development.

Radiation fog requires surface radiative cooling. Land cools much more efficiently than water due to water's high heat capacity, so radiation fog only forms over land surfaces.

Advection fog forms when warm moist air moves horizontally over a cooler surface. This can happen over the ocean (moving over cold currents) or over land (moving over cold ground), making both locations possible.

Equatorial airmasses originate near the equator where solar insolation is intense year-round, resulting in consistently high temperatures. These warm airmasses maintain their thermal characteristics as they move.

Polar maritime airmasses originate from polar/oceanic regions where temperatures are consistently cold. These airmasses bring cold conditions as they move into warmer regions.

Arctic airmasses originate in the Arctic region where temperatures are extremely cold. These airmasses bring frigid conditions as they move southward into warmer regions.

Cold fronts occur when cold air advances under warm air, forcing the warm air upward rapidly. This violent lifting produces cumulonimbus (CB) clouds, which are tall, dense clouds associated with thunderstorms.