Weather Condition of the atmosphere at a certain place and time

FACTORS THAT AFFECT WEATHER:

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

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

TWO TYPES OF HUMIDITY:

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

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

humidity air feels heavy, sticky and uncomfortable

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

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

CONDENSATION

Condensation Close to the ground FOG

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

3. AIR PRESSURE Air has weight

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

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

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

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

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

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

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

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