Global weather Forecasting

A Weather System is the total of all the conditions of temperature,  pressure, wind speed and humidity for a relatively large area.

To analyze weather systems various instruments are used. Instrument 

Measures

Unit

Thermometer 

Temperature

°C

Hydrometer

Density of a fluid

kg/m3

Psychrometer

Relative humidity

%

Hygrometer

Absolute humidity

g/L

Anemometer 

Wind Speed

km/hr or knots or mph

1

2

Weather Satellites

There are approx. 88 of these owned by various countries orbiting  the earth. http://www.theweathernetwork.com/weather/maps/

An Air Mass is a large body of air that stays together for several days.   It has uniform temperature and moisture and may cover several hundred to  several thousand kilometers.

The movement of these air masses effects local weather conditions.

3

4

Front: 

The leading edge of an approaching air mass.

Cold Front: 

Leading edge of a cold air mass.

Warm Front: Leading edge of  a warm air mass

http://www.mesoscale.iastate.edu/agron206/animations/05_cnWfronts.html

http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page 01.cfm?chapter_no=visualization

Stationary Front:  Warm and Cold Fronts meet and stall briefly.

5

Occluded Front:  When a cold front catches the warm front in a process  called cyclogenesis A TROWAL is not a front.  When an occluded front gets pushed up  into the air.  Also sometimes called a trough.

TROWAL

6

Read pages 546­548 Assign Last Portfolio Assignment ­ North American Weather Systems Extreme Weather and In­Class work/review Next day:  Read the following selections and write the definition of the bolded words in your  notes. Read p. 567 ­ 570  Read p. 579 ­ 581 Read p. 584 ­ 588 Read p. 589 ­ 591 Read p. 594 ­ 597 Answer the following in your notebook. do p. 576 #1,2,5,11 do p. 588 #1 do p. 591 #1, 3 ALL portfolio work is due for the test day.

7

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