Weather Information Flashcards
State the general characteristics in regard to the flow of air around high and low pressure systems in the Northern hemisphere?
Low Pressure - Inward, upward and counter clockwise.
High Pressure - Outward, downward and counter clockwise.
If your route of flight takes you towards a low-pressure system, in general, what kind of weather can you expect?
Low pressure system is characterised by rising air, which is conducive to cloudiness, precipitation and bad weather.
If your route of flight takes you towards a high-pressure system, in general, what kind of weather can you expect?
A high-pressure system is an area of descending air which tends to favour dissipation of cloudiness and good weather.
Cold Front
Occurs when a mass of cold, dense and stable air advances and replaces a body of warmer air.
Occluded Front
A frontal occlusion whens a fast moving cold front catches up with a slow-moving warm front. Two types: cold front occlusion and warm front occlusion.
Warm Front
The boundary area formed when a warm air mass contacts and flows over a colder air mass.
Stationery Front
When the forces of two air masses are relatively equal, the boundary or front that separates them remains stationary and influences the local weather for days. The weather is typically a mixture of both warm and cold fronts.
General characteristics of a cold front.
As the front passes, expected weather can include towering cumulus / cumulonimbus, heavy rain can accompanied by lightning, thunder and / or hail; tornadoes possible; during passage, poor visibility, winds variable and gusting; temperature / dew-point and barometric pressure drop rapidly.
General characteristics of a warm front.
As the front passes, expected weather can include stratiform clouds, drizzle, low ceilings and poor visibility; variable winds; rise in temperature.
What is a trough?
An elongated area of relatively low pressure. At the surface when air converges
