Weather Prediction

What does low pressure usually mean for weather?

• It will be sunny because cold air is sinking.

• It will be cloudy because cold are is sinking.

• It will be sunny because are air is sinking.

• It will be cloudy because warm air is rising.

What does high pressure usually mean for weather?

• It will be sunny because cold air is sinking.

• It will be cloudy because cold are is sinking.

• It will be sunny because are air is sinking.

• It will be cloudy because warm air is rising.

Why does a HIGH pressure system usually bring dry, clear skies?

• The air is warm, less dense, rises and moves so fast it doesn't have time to make clouds.

• The air is cold, more dense and sinks. There is no water vapor rising to make clouds.

• The air is warm, more dense and sinks. There is no water vapor rising to make clouds.

Why does a LOW pressure system usually bring cloudy and often stormy weather?

• The air is warm, less dense, rises and moves so fast it doesn't have time to make clouds.

• The air is cold, more dense and sinks. There is no water vapor rising to make clouds.

• The air is warmer and less dense. It rises and the water vapor condenses to make clouds.

What causes wind?

• Air moving from ares of HIGH density to areas of LOW density.

• Air moving from areas of LOW density to areas of HIGH density.

• Gnomes. It's always the gnomes!

Which of the following does NOT directly affect weather?

• Temperature

• Humidity (how much water is in the air)

• Air Pressure

• Wind Speed

• Time of Day

What does a cold front mean?

• Two air masses collide and neither moves.

• A warm, moist air mass slides over a cold, dense air mass.

• A cold dense air mass pushes under a warm less dense air mass.

• Two air cold air masses trap a warm air mass.

What does a warm front mean?

• Two air masses collide and neither moves.

• A warm, moist air mass slides over a cold, dense air mass.

• A cold dense air mass pushes under a warm less dense air mass.

• Two air cold air masses trap a warm air mass.

What does a stationary front mean?

• Two air masses collide and neither moves.

• A warm, moist air mass slides over a cold, dense air mass.

• A cold dense air mass pushes under a warm less dense air mass.

• Two air cold air masses trap a warm air mass.

Why would clouds form when warm and cold air masses collide?

• Cold air always brings clouds.

• Warm air always brings clouds.

• The water vapor in the warm air mass cools when it interacts with the cold air mass.

• The water vapor in the cold air mass cools when it interacts with the warm air mass.