WEATHER WARM UP VOCABULARY TO KNOW~ What is humidity? What is precipitation? What is air pressure? The amount of moisture in the air around you. It indicated the likelihood precipitation, fog, or dew. It is measured with a hygrometer or pyschrometer. A result of condensation in the atmosphere that falls due to gravity this includes rain, sleet, hail, or snow. It is measured with a rain gauge. The amount of force that air molecules push on you or a surface. It is measured with a barometer.

WEATHER TOOLS- INSTRUMENTS NEEDED TO FORCAST

Measure of the average amount of motion in particles. More motion more HEAT. Measure with a thermometer in o C or o F

HUMIDITY Amount of water vapor in the air  It indicated the likelihood precipitation, fog, or dew.  Measure it with a Hygrometer or Sling Psychrometer  It is expressed as a % of water vapor. 45% is comfortable for humans.  Humidity is to blame for that muggy, steam-room feeling you experience on certain summer days. Humans are very sensitive to humidity, as the skin relies on the air to get rid of moisture. atch?v=g2C6rKAvzbs&index =1&list=PLs_igQW0dTqFQB Olq84rWm-e5WHTSkeFn

 Natural movement of air at any speed  Wind speed is measured with an anemometer  Wind direction is measured with a wind vane

AIR PRESSURE Force on an area by the air molecules Measure with a barometer

PRECIPITATION ANY PRODUCT OF THE CONDENSATION OF ATMOSPHERIC WATER VAPOR THAT FALLS UNDER GRAVITY Snow (#10): forms when water vapor turns directly into ice without ever passing through a liquid state. Hail (#11): frozen water from the cloud that is pushed back up by wind then covered again, cycle continues. Sleet: mixture of snow and rain as well as raindrops that freeze on their way down. Rain (#12): drops of liquid water fall all the way to the surface of the Earth. Freezing rain (#13): (glaze) takes place when water droplets become super- chilled and do not freeze in air, but rather freeze the instant they strike an object, such as a road or car.

WEATHER MAPS Show atmospheric conditions above a large portion of the Earth's surface. Meteorologists use weather maps to forecast the weather.

Lightning ~Electric discharge (bright flash of electricity) from a Cumulonimbus cloud.

DOPPLER RADARS DETECT CLOUD COVER AND PRECIPITATION BY USING RADIO WAVES.

NOAA USES SHIPS, SATELLITES, AND PLANES TO COLLECT INFORMATION ABOUT THE WEATHER.

What causes the wind to blow? Some parts of the Earth receive direct rays from the SUN all year and are always warm (close to the equator.) Other places receive indirect rays, so the climate is colder (near the poles.) The rising and sinking of air due to it’s temperature. Warm air, which weighs less than cold air, rises. Then, cool air moves in and replaces the rising warm air. High and low pressures moves around They all cause the movement of the air molecules.

ACTIVITY: COMPLETE YOUR NOTES SHEET: WRITE YOUR OWN WEATHER FORECAST FOR WASHINGTON DC. WHAT WEATHER DO YOU WANT?!?

DID YOU KNOW? Hail isn't always round or small enough to hold in the palm of your hand.Some of these hard chunks of ice are elongated or jagged. They are mostly the size of gumballs, golf balls, or even baseballs. But the largest hailstone ever recorded in the United States landed in Coffeyville, Kansas, in Measuring 17.3 inches around, this monster ice crystal weighed 1.67 pounds. The National Center for Atmospheric Research held on to it and made models. Imagine what it would have felt like to be hit on the head with that hailstone! Hurricanes almost never occur in Europe. In fact, there was no word for hurricane in English until Europeans settled in the Caribbean Islands. The Spanish took the name of a storm god, Huracán, from the Taino Indians. These storms are also known as typhoons, cyclones, and severe cyclonic storms when they occur in other oceans. Lightning does strike more than once, even when it comes to people.Your chances of being hit by lightning are very low. Some estimates put the odds at 1 in 350,000. Others at 1 in 600,000. Roy C. Sullivan, a park ranger, is the only person known to have been struck by lightning seven times. He survived each time, but not unscathed. He lost a toenail, had his eyebrows burned off and his hair seared twice, and even suffered shoulder and leg burns.