Chapter 8.4 - Pressure Systems and Wind Flashcards
What number appears on the Isobars?
MSL Pressure (hPa).
What is a region of High Pressure called and it’s marking on synoptic charts (2)?
- Anticyclone.
- H or High.
What is a region of Low Pressure called and it’s marking on synoptic charts (2)?
- Cyclone/Depression.
- L or Low.
An elongated region of High Pressure extending outwards from an Anticyclone is called?
Ridge.
An elongated region of Low Pressure extending outwards from a Cyclone is called?
Trough.
In an Anticyclone, the central pressure is ‘x’ than the surrounding area?
Greater.
In which directions does airflow in High Pressure?
Anticlockwise.
Which inversion is associated with High Pressure?
Subsidence.
Which type of clouds (if any) form under High Pressure?
Stratiform
In a Cyclone, the central pressure is ‘x’ than the surrounding area?
Lower.
In which directions does airflow in Low Pressure?
Clockwise.
A Cyclone in the tropics is known as?
Tropical Depression.
A Tropical Cyclone is when the central pressure has fallen below ‘x’ hPa and the windspeed has increased to above ‘x’ knots?
- 1000 hPa.
- 34 kts.
Which type of clouds form under Low Pressure?
Cumuliform.
An area of Neutral Pressure between two Anticyclones and Cyclones is called?
Col.
Name three types of Col?
- Anticyclonic Col.
- Cyclonic Col.
- Neutral Col.
True or False. A Col will appear on the weather map with Isobars?
False.
Air in horizontal/vertical motion is called wind?
Horizontal.
Define Pressure Gradient Force?
The resulting force when there is a difference in pressure across a surface.
True or False. The steeper the pressure gradient, the larger the pressure gradient force?
True.
Wind tends to blow at right angles to/parallel to Isobars?
Parallel.
The spacing of Isobars indicate the size of what?
Pressure Gradient.
Describe the wind between Isobars being closer and further apart from each other (2)?
- Closer = Stronger Winds.
- Further = Lighter Winds.