Weather

Weather forecasts help people plan their days and plan for particular meteorogical conditions.

Here in Los Angeles one might not only plan for small temperature changes but also for unusual/inclimate situations, such as a rain storm in the middle of summer or unusualy warm days in fall.

Core Elements of Weather:

1. Temperature: A measure of heat energy in the air driven by uneven solar heating of the Earth.
2. Air Pressure: The weight of the atmosphere. High-pressure systems bring clear skies, while low-pressure systems cause rising air, clouds, and storms.
3. Wind: Air movement caused by pressure differences as warm air rises and cool air sinks.
4. Humidity: The amount of moisture or water vapor in the air. Warm air holds more moisture than cold air.
5. Precipitation: Condensed water vapor such as rain, snow, or sleet that falls when air cools to its dew point.

blahblah

Weather forecasting or weather prediction is the application of science and technology to predict the conditions of the atmosphere for a given location and time. People have attempted to predict the weather informally for thousands of years and formally since the 19th century. Weather forecasts are made by collecting quantitative data about the current state of the atmosphere, land, and ocean and using meteorology to project how the atmosphere will change at a given place. Once calculated manually based mainly upon changes in barometric pressure, current weather conditions, and sky conditions or cloud cover, weather forecasting now relies on computer-based models that take many atmospheric factors into account. Human input is still required to pick the best possible model to base the forecast upon, which involves pattern recognition skills, teleconnections, knowledge of model performance, and knowledge of model biases.