Weather Maps Notes Flashcards
Atmospheric Pressure
-Pressure caused by the ___________of air above an area.
Weight
Atmospheric Pressure
-Pressure __________ with increasing height above Earth.
Decreases
Atmospheric Pressure
-A square inch of column of air weighs ________ pounds.
14.7 pounds
Air Pressure is measured with a barometer in _________.
Millibars
Air Pressure
-Average barometric pressure at sea level is 1013.25 _________ or ___________ inches of mercury.
Millibars
79.92
Air Pressure
-_________ pressure - cold dense air that creates __________ pressure on the barometer.
High, greater
Air Pressure
-____________ pressure- warm air is less dense creating ________ pressure on the barometer.
Low, less
High Pressure
- As air cools, it becomes __________ __________ and sink toward the Earth’s surface spinning __________.
More dense, clockwise
Low Pressure
-As air warms, it becomes __________ __________ and rises above the Earth’s surface spinning ____________.
Less dense, counter clockwise
Is this a high or low pressure weather example:
Sunny, cloudy skies
High Pressure
Is this a high or low pressure weather example:
Cloudy, stormy skies
Low Pressure
Is this a high or low pressure weather example:
Calm wind, spiral clockwise
High pressure
Is this a high or low pressure weather example:
Cool dry air
High Pressure
Is this a high or low pressure weather example:
Strong winds counter clockwise
Low pressure
Is this a high or low pressure weather example:
Warm moist air
Low pressure
Is this a high or low pressure weather example:
Higher than normal 30.5 Hg
High pressure
Is this a high or low pressure weather example:
Lower than normal 28.9 Hg
Low pressure
Isobars
A line connecting points of equal ___________ ____________.
Air pressure
Isobars
Measured in ______________ mb
Millibars
Isobars
-One mb. Is equal to _________ inches of mercury.
.02953
Low Pressure in Storms:
______________ 25.17 Hg mb.
Tornadoes
Low Pressure in storms:
__________ 26.05 Hg mb
Hurricanes
Air masses
-Large body of air that has relatively uniform _____________ and _______________.
Temperature and Humidity
Air Masses
-Originate over land ______________
Continental
Air Masses
-Originate over land continental, over water ___________.
Maritime
Air Masses
-Cold air masses tend to approach from _____________.
North, North West, West
Air Masses
-Warm air masses tend to approach from _____________.
South, South East, East
Frontal Movement
-Cooler air masses __________ are more dense and flow toward areas that are __________ dense, warm and _________.
Frontal Movement
-___________ pressure areas move into ___________ pressure areas.
High
Low
Front
-The boundary between ________ air masses.
Two
Front
-Classified by which type of air mass (cold or warm) is replacing the other.
?
Front
-Map Symbols point in the direction the front is ________.
Moving
Cold Front
-A cold air mass is ____________________ a warm air mass.
Replacing
Cold Front
-Air behind the front is colder and _______. Pressure _______.
Dryer, increases
Cold Front
-Moist air is pushed up over the _________ air. _________ and __________ form along leading edge of front.
Cold
Showers and Thunderstorms
Warm Front
- A warm air mass is replacing a _______ air mass. Air behind the front is ______ and ______. Pressure goes ______.
Cold
Warm and humid
Down
Warm Front
-Slow moving, gradual rise of warm air over ________ air.
Cold
Warm Front
-Widespread, continuous _____________ occurs along and ahead of the front.
Precipitation
Stationary Front
- A boundary between two different air masses, neither is _______ enough to replace the other. Light _______ over several days.
Strong
Rain
Occluded Front
-Two cold air masses converge on a __________ air mass.
Warm
Occluded Front
-Occurs when a fast moving cold front overtakes a ________ front pushing it up and over _______ air.
Warm
Cold
Occluded Front
-_______________ form along the front. After frontal passage the sky is ___________ and ___________.
-Approaches from the east and northeast. The term _____________ is most commonly used in the northeast U.S. when cool Atlantic maritime air moves in from the east and replaces ___________ continental air.
Back door
Warmer
__________________ measures atmospheric pressure in Hg.
Anemometer
________ measures wind speed in Km
Thermometer
___________ measures temperature in C and F
____________ carries instruments to high altitudes.
Weather balloon
________ helps determine wind direction on weather maps.
Compass rose
