Meteorology Today, Ahrens Chap 11 Flashcards
Where are most source regions
High pressure regions
How do Stationary fronts form
when a cold front or warm front stops moving. This happens when two masses of air are pushing against each other, but neither is powerful enough to move the other
What is Frontolysis
When the front weakens and dissipates due to temperature contrasts becoming smaller
What is Frontogenesis
When the front strengthens and regenerates due to temperature contrasts becoming larger
Average speed of cold and warm front
20 knots for cold, 10 knots for warm
What is a frontal inversion
Frontal inversions are when warm air overruns cooler air in warm and cold fronts
Why are there often cirriform clouds before a cold or warm front passes
overrunning. Clouds often become thicker the closer you get to a front
Where do cirrus clouds form in a warm front
Cold side
Where do Cirrus clouds form in a cold front
depends on air aloft, as the air can blow the higher level cirrus clouds formed at cold fronts
What are dry-lines
narrow boundary where there is a steep horizontal change in
moisture
What are warm type occluded fronts
a type of occluded front that occurs when the air behind the front is warmer than the air ahead of
What are cold type occluded fronts
occurs when a cold air mass overtakes a warm front, pushing the warm air upwards
