Chapter 19 - Fronts and Frontal Depressions Flashcards
What is Frontogensis
Creation of a front when two air masses are converging
What is Frontolysis
Dissipation of a front when two air masses are diverging
During the winter there’s temp difference between polar and arctic air masses, what forms
An arctic front with a jet stream at 20,000 feet
A mediterrain front occurs when and how
in the winter when lots of local winds converge on to it
Polar front goes starts and finishes where in the winter and summer
Winter - Flordia to SW UK
Summer - Newfound land / nora scotia to scottish isles
What happens at a Quasi-stationary Front
polar air meets tropical air, the winds meet and flow in opposite direction
In front of warm front what happens to the pressure
decreases
Behind a cold front what happens to pressure
increases
For a warm front give the gradient, whole front size and speed
1:150 (180)
500 NM
2/3 the speed at 2000/3000 ft (about 10 kts)
The warm front tropical maritime give WX for winter and summer
Winter - strato cumulus, fog, bad visibility
Summer - Fairweather cumulus
For a cold front give the gradient, whole front size and speed
1:50 (80)
300 NM
Same speed as 2000/3000 feet (15 knots)
How long do PFD hit the UK for, which clouds are found in front and behind
1-2 days
Cumulus
Where do you tell the direction of the PDF
Direction of the ISO bars in the middle of the warm air.
The air here is at 80% of the speed at 2000/3000 feet
it takes 9-12 hours for it to pass
Fronts spread out because
they move at 90 degrees to themselves
PDC occlusion warm is which Y and where are the colds
Normal Y
Cold - Coldest
