Today, we'll discuss how water vapor exists in our atmosphere. Can anyone tell me what water vapor is?

Correct! Water vapor is present in the air as a gas. It varies from 0 to 4 percent by volume. Let’s talk about humidity, which refers to the amount of moisture in the air.

Great question! We measure it in terms of absolute humidity, which is the weight of water vapor per unit volume of air. Remember: A for Absolute humidity. Now, who can tell me what relative humidity indicates?

Exactly! Relative humidity tells us how saturated the air is with moisture at a given temperature. Great job!

Now, let’s jump into how water vapor is added to the atmosphere through evaporation. What do we know about evaporation?

Exactly! Heat causes evaporation. Now, can someone tell me what condensation refers to?

Yes! When warm, moist air is cooled, it condenses into liquid water. This process is crucial for cloud formation.

Excellent observation! Condensation is influenced by temperature and humidity conditions. The key point to remember: 'Cooling equals Condensation.'

We have talked about humidity and the processes of evaporation and condensation. Now let’s classify clouds. Who remembers what nimbus clouds are?

Correct! Nimbus clouds are typically dark gray and very dense. They often signal precipitation. Remember: N for Nimbus, N for 'Need an umbrella!'

Nimbus clouds usually form when warm, moist air rises and cools quickly, leading to significant condensation, hence why they’re associated with rain.

Now let’s discuss the weather implications of nimbus clouds. How do they affect our weather?

Absolutely! They're often associated with precipitation because they're heavy and thick. Remember : 'Nimbus = Rain!' How does that make you feel about outdoor activities?

Exactly! Always be prepared for rain when you see those dark clouds. In summary, nimbus clouds are vital in our understanding of weather patterns.