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SAI INTERNATIONAL SCHOOL


                                               SUBJECT - GEOGRAPHY
                                                    LESSON NOTES

                                                       CLASS – VII
       CHAPTER – UNDERSTANDING THE WEATHER
       Weather Stations:


       A centralized location that brings together various instruments to measure weather at a specific place and time.

             Function:Readings are taken at regular intervals.
             Purpose: Data collected is used for mapping and forecasting weather patterns.

       Automated Weather Stations (AWS)


             Nature: A self-operating system that functions without human intervention.
             Sensors & Measurements:
                  o  Temperature and Humidity.
                  o  Wind Speed and Direction.
                  o  Precipitation (Rainfall/Snow).
                  o  Atmospheric Pressure.
             Applications:
                  o  Agriculture: For crop planning and irrigation.
                  o  Aviation & Navigation: For safe travel.
                  o  Environmental Monitoring: Tracking climate health.




             Case Study (Sikkim, 2023):
                  o  The National Disaster Management Authority installed an AWS at a glacial lake in Sikkim.
                  o  Altitude: Over 4800 metres above sea level.
                  o  Goal: Provide early warnings for upcoming weather conditions in high-altitude regions.


       Predicting the Weather


       Meteorologists: Scientists who study the atmosphere and weather.

       Process:

                  1.  Data Collection: Use instruments to gather data over long periods.
                  2.  Analysis: Study data using scientific methods to identify trends.
                  3.  Forecasting: Predict future weather conditions.
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