Weather study guide answer

Humidity  Humidity is the amount of water vapor in air.  The air cannot hold much more water when humidity is high so your sweat will not evaporate to cool you off.

Humidity  How is temperature related to the amount of water vapor air can hold?  The warmer the temperature, the more water vapor it can hold.

Humidity  What is relative humidity?  Relative humidity measures how much water vapor air is holding compared to how much it could hold at a certain temperature; it is written as a percent.

Precipitation  How does precipitation form?  Precipitation forms when evaporated water vapor condenses in clouds on particles such as dust

1 ) sun  2) clouds  3) evaporation  4) precipitation  5) bodies of water  6) condensation

Identify the types of precipitation  a. rain  b. freezing rain  c. sleet  d. snow  e. hail

types of molecules  water vapor and solid particles (dust)

High and Low Pressure Systems

 Warm air is less dense than colder air and rises in the atmosphere.  Rising moist air causes areas of low pressure, creates clouds, and is associated with stormy weather.

High and Low Pressure Systems  Cool air is more dense than warmer air and sinks in the atmosphere.  Sinking dry air causes areas of high pressure, evaporates clouds, and is associated with fair weather

Wind forms  Air molecules move from areas of high pressure to low pressure; these moving molecules create wind.

Thunderstorms  Thunderstorms form when warm, moist air rises quickly and then cold air sinks quickly.

Thunderstorms  Three dangers of thunderstorms include: heavy rains (flash floods), lightning, strong winds, tornadoes, and hail.

Thunderstorms  Lightning is produced in a cloud when different parts of the cloud become oppositely charged. When current flows between regions of opposite electrical charge, lightening flashes

Thunderstorms  Thunder is caused by the rapid heating of air around a bolt of lightening

Tornadoes  Tornadoes form when the up and down movement of air in a thunderstorm begins to move in a circular motion.

Tornadoes  Weather that is associated with tornadoes includes hail and lightning.

Tornadoes

Tornadoes  The Fujita Scale is used to rate tornadoes based on the wind speed. (F-0 through F-6)

Tornadoes  Warm moist air from the Gulf of Mexico collides with cool air from Canada and dry air from the Rockies. This collisions of air mass is often triggers thunderstorms, often very strong ones.  Tornadoes form during thunderstorms, when unstable hot air near the ground rises and meets the cooler air above in the thunder clouds.

Hurricane   Low pressure system over the ocean near the equator  Hurricanes form when warm, moist air rises quickly over warm water.

Hurricane

Hurricane  Typhoon in the Pacific ocean  Tropical cyclone in the Indian ocean

Hurricane  Three dangers of hurricanes include: strong winds, heavy rains (flooding), storm surge, and tornadoes.

Blizzard   A severe snowstorm characterized by strong winds and low temperatures

Blizzard  During a blizzard you should stay indoors, dress warm and be prepared

 Low pressure often brings stormy weather, and high pressure often brings fair weather. Which of the locations is most likely to have clear skies? a. Q a. Q b. R c. S d. U QQQQ

 What kind of front does the line with the half circles represent?  warm front

mm  In what direction is the cold front moving?  east

 What type of weather should city “U” be expecting?  warmer temperatures