tornadoes, hail, high winds

clear, sunny skies

gentle showers

high humidity but no rain

They cause warm air to rise and cold air to sink.

They cause cold air to rise and warm air to sink.

They cause warm and cold air to sink.

They cause warm and cold air to rise.

a boundary between two different air masses, where cold air is retreating and warm air is advancing

a boundary between two different air masses, where cold air is advancing into warm air

a boundary between two different air masses, where two warm air masses collide

a boundary between two different air masses, where two cold fronts cancel each other out

air pressure

temperature

dew point

wind chill

the storm will weaken

the storm will strengthen

nothing will happen to the storm

the storm will produce lightning

winds moving towards the center of the storm and warm air rising into the clouds

winds moving at low speeds and a high temperature

high temperature and high moisture content

winds moving away from the center of a storm and high moisture

moisture and differences in air pressure

moisture and lightning

moisture and heat

moisture and heavy clouds

Thunderstorms can occur year-round and at all hours. But they are most likely to happen in the spring and summer months and during the afternoon and evening hours.

Thunderstorms are most likely to happen in the fall and winter months at all hours of the day.

Thunderstorms can happen year round but are more likely to happen in the evening and early morning hours.

Thunderstorms do not happen more often at any time of day or during any specific season.

A squall line is a group of storms arranged in a line, often accompanied by “squalls” of high wind and heavy rain.

A squall line is a group of cold fronts that occur back to back across a wide area over a short time.

A squall line is a warm front that brings temperatures to a "squall" causing record breaking heat waves.

A squall line is a sea breeze that brings cold air currents from the ocean to land, which birds often ride to shore.

all of these

where there is a difference in air pressure and high moisture

where a warm front meets a cold front

where moist warm air is on the ground and cold dry air is above