Weather. Click HERE for Discovery Channel Guide to Extreme Weather (50 min). Weather -It’s what’s happening outside NOW!. Weather. All weather is a result of humidity, condensation and pressure. Water Cycle. Humidity—Water Vapor in the Air.
All weather is a result of humidity, condensation and pressure.
Relative humidity: how close the air is to reaching its maximum capacity of water vapor
Measured with a psychrometer
A psychrometer has two thermometers to determine humidity. The dry bulb thermometer measures the room temperature, and wet bulb thermometer is wrapped in a wet cloth. Air is passed through the psychrometer to evaporate moisture on the wet bulb. The readings on the dry bulb thermometer and the wet bulb thermometer are then compared to determine the actual humidity.
When water changes from a gas to a liquid
Smog over LA
from car exhaust
Classified by altitudeand shape
Stratus: clouds that form inlayers
Cirrus: high,featheryice clouds
Cumulus: fluffyclouds with flat bases
Any form of water that falls from a cloud to Earth’s surface
depend on the temperature of the atmosphere, both at the surface & on the way down
Rain Shadow effect: near a mountain range, the windward side gets lots of rain and the leeward side gets little/no rain – the rain shadow
Continental: dryPolar: cold
Maritime: wetTropical: warm
Stationary front: when a front stops moving forward, producing clouds & precipitation – causes floods if stationary too long
Trend Method: using past movement of a front & precipitation to predict future movement