In areas of strong low pressure systems in the stratosphere.
At the tropopause where intensified temperature gradients are located.
In a single continuous band, encircling the Earth, where there is a break between the equatorial and polar tropopause.
In areas of strong high pressure systems in the stratosphere.
About 12000 FT above the core.
The warm air side of the core.
Exactly in the center of the core.
The cold air side of the core.
CB cloud line where the jetstream crosses the cold front.
CI clouds on the equatorial side of the jetstream.
CS cloud band on the polar side and under the jetstream.
CI clouds on the polar side of the jetstream.
Equatorial jet stream / arctic jet stream.
Equatorial jet stream / polar front jet stream.
Arctic jet stream / subtropical jet stream.
Subtropical jet stream / polar front jet stream
A reduction in the decrease of pressure with height over land compared with the sea.
An increase in pressure for a given upper level due to surface heating by day
Increase in stability over the sea due to nocturnal cooling
Decrease in stability over the land due to insolation
Ice crystals and water droplets but never supercooled water droplets
Only ice crystals
Only water droplets
Ice crystals, water droplets and supercooled water droplets
icy clouds at high levels
Zones where the air temperature is below -15°C
Unstable clouds at medium levels
It promotes vertical wind shear
It promotes extensive vertical movement of air
It prevents vertical wind shear
It results in good visual conditions near the surface
In all stages
Downdraught of a cumulonimbus at the formation stage
Updraught of a cumulonimbus at the growth stage
Downdraught of a cumulonimbus at the mature stage
Updraught of a cumulonimbus at the mature stage