Air Masses
What is a high pressure system?
a weather system associated with sinking air resulting in clear weather
True or false: Day-of weather forecasts are more accurate that 10-day weather forecasts
True
What is likely to cause clouds to form in a previously clear sky?
A warm air mass moving into an area and rising.
What is humidity?
The measure of the amount of water vapor in the air
What is a low pressure system?
a weather system associated with rising air resulting in cloudy, rainy, or snowy weather
Why are weather forecasts less accurate if they're far in advance? (example: 10-day forecasts, month forecasts, etc)
Because while we have some data, weather is unpredictable and can change frequently.
What can describe the air behind a cold front?
Cold and dry air.
What is relative humidity?
The amount of water vapor in the air compared to the amount of water vapor at saturation
Which is correct about how air typically moves?
Air moves from high-pressure areas to low-pressure areas.
A forecast says that the dew point temperature is equal to the air temperature. What does this mean?
Relative humidity is 100%, and it may rain.
Can the dew point temperature be hotter than the air?
No, that would mean the air holds more water vapor than it can
Warm air
Which air mass would form over cold water?
maritime polar
What kind of weather can you expect in a week that starts with low-pressure systems and ends with high-pressure systems?
Dense clouds followed by a light wind and clear skies
A new air mass moves into an area! What's going to happen?
The warmer air mass rises, and there will be clouds and rain.
What does it mean when the weather forecast says 90% humidity?
the amount of water vapor in the air is 90% of what the air can hold.