Chapter 11, Lesson 7 – Air Masses and FrontsChapter 11, Lesson 8 –

Severe Storms

air massfront

cold frontwarm front

thunderstormtornado

hurricanestorm surge

cold front – cold air moves in under a warm air mass. Cold fronts often bring brief, heavy storms. There may be thunderstorms and strong winds. After the storm,

the weather is usually cooler and drier.

cold front – cold air moves in under a warm air mass. Cold fronts often bring brief, heavy storms. There may be thunderstorms and strong winds. After the storm,

the weather is usually cooler and drier.

warm front – warm air moves in over a cold air mass. Warm fronts often bring light, steady rain of snow. The precipitation may last for days. Winds are usually light. Warm front may also bring fog – stratus clouds that form

near the ground. Afterward the weather is usually warmer and more humid.

warm front – warm air moves in over a cold air mass. Warm fronts often bring light, steady rain of snow. The precipitation may last for days. Winds are usually light. Warm front may also bring fog – stratus clouds that form

near the ground. Afterward the weather is usually warmer and more humid.

warm front – warm air moves in over a cold air mass. Warm fronts often bring light, steady rain of snow. The precipitation may last for days. Winds are usually light. Warm front may also bring fog – stratus clouds that form

near the ground. Afterward the weather is usually warmer and more humid.

warm fronts vs. cold fronts

thunderstorm – the most common type of storm

thunderstorm – the most common type of storm

tornado – a violent whirling wind that moves across the ground in a narrow path

tornado – a violent whirling wind that moves across the ground in a narrow path

hurricane – a very large swirling storm with very low pressure at the center

hurricane – a very large swirling storm with very low pressure at the center

hurricane – a very large swirling storm with very low pressure at the center

storm surge – a great rise of the sea along a shore

storm surge – a great rise of the sea along a shore

storm surge – a great rise of the sea along a shore