1. Weather
Condition of the atmosphere at a certain place and time

2. FACTORS THAT AFFECT WEATHER:

3. 1. TEMPERATURE how hot or cold the air is
depends on how much energy the air receives from the sun
thermometer

4. Amount of water vapor in the air
2. HUMIDITY
Amount of water vapor in the air

5. TWO TYPES OF HUMIDITY:

6. A. Absolute Humidity
Measure of how much water vapor the air is capable of holding
The hotter the air is, the more moisture it can hold

7. B. Relative Humidity
how much moisture there actually is in the air

8. humidity
air feels heavy, sticky and uncomfortable

9. relative humidity = 100%,
 air is totally saturated with water

10. 100% humidity
water vapor starts returning to its original liquid state
CONDENSATION

11. CONDENSATION

12. Condensation
Close to the ground
FOG

13. Condensation
Way up high in the atmosphere
CLOUDS
RAIN, SNOW, HAIL

14. 3. AIR PRESSURE
Air has weight

15. A. High Pressure Area Air slowly descends towards the earth’s surface
Clear, sunny days

16. B. Low Pressure Area Air rises upwards into the atmosphere
High humidity, clouds and precipitation

17. Air masses – constantly moving
Boundaries = FRONTS  where heavy storms take place

18. CLIMATE Area’s long –term weather pattern Areas near the equator
warm climate/ tropical
Areas near the poles
colder climate

19. Philippine climate - TROPICAL Rainy season and dry season Heavy rains:
May – October
Cooler and drier air:
December – February
Hot and dusty:
March – May
Typhoon belt
storms during July- October
North and eastern Luzon, Bicol and Visayan regions

20. WEATHER DISTURBANCES Thunderstorm Tropical Cyclone
In Asia , a tropical cyclone is called a TYPHOON
In the US  hurricane

21. TYPHOON Heat of the sun Bodies of water become warm
Air above the bodies of water become warm
Warm air RISES and creates a LOW PRESSURE AREA
Warm mass of air that carries a lot of water vapor rising from the ocean moves in a COUNTERCLOCKWISE direction = typhoon

22. Classification of tropical cyclones:
Tropical depression – wind speed less than 63 kph
Tropical storm – maximum wind speed from kph
Typhoon – wind speed greater than 118 kph
Typhoons in the Philippines usually form over the Pacific ocean