Forecasting the Weather

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Forecasting the weather Weather: The state of the atmosphere at a specific time and plac e. Meteorologist: scientists who study the atmosphere Weather.

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Presentation transcript:

Forecasting the Weather Chapter 24.4 Forecasting the Weather

Objectives Explain how a weather map is made Describe the steps involved in preparing a weather forecast.

Forecasting the Weather The World Meteorological Organization was created to promote the rapid exchange of weather information.

Station models summarize weather conditions at individual weather observation stations. Dew point: the temp. at which the air is cooled for it to become saturated with water vapor.

Meteorologists use these symbols to indicate weather conditions, wind speed, cloud cover, and wind direction. The inset shows conditions around a weather station. Page 616

The wind direction indicated by the symbol labeled “2” is Northerly (0o). The cloud conditions that are indicated by the symbol labeled “1” is overcast. Wind speed in #2 is: Cloud conditions in #2 is: Wind direction in #1 is: Wind speed in #1 is: Isobar: a line on the weather map that connects the points of equal atmospheric pressure.

A typical weather map shows isobars, highs and lows, fronts, and precipitation.

Types of Forecasts Daily: Weather conditions for a 48 hour period. Daily extended forecast look ahead five days. Extended: Long-range forecast that cover monthly and seasonal outlooks. Usually these are not very accurate at predicting precipitation.

Severe Weather Safety Tips Thunderstorm Listen to weather updates, stay indoors and avoid water and electrical appliances Tornado Find shelter in a basement or room with no windows. Protect head and neck from debris.

Safety Cont. Hurricane Listen to evacuation routes and stay indoors to be away from flying debris Blizzard Listen to weather updates. Dress warmly and avoid walking or driving in icy conditions.

Controlling the Weather Cloud Seeding Scientist try to produce precipitation by adding freezing nuclei to supercooled clouds. Hurricanes have not been successfully controlled by using cloud seeding.