Weather

EP.p2X B,C,D,E,G,H

WATER IN THE AIR

DO NOW

What is the difference between Weather and Climate?

-Weather is the condition of the atmosphere at a particular time. -Climate is weather over long periods of time

Humidity

• Humidity- amount of water in the air– Warmer air holds more water vapor

• Relative Humidity- amount of moisture in the air compared to (Divided By) how much the air can hold

• EXAMPLE: Say the air can hold 24G’s of moisture, but only has 18G’s. What the relative humidity?

• Answer- 75%. 18G/24G = .75– Humidity/ Maximum Possible Humidity

• Psychrometer- device that measures relative humidity

• Relative Humidity can be affected by:– Rates of evaporation (Water vapor in the air)– Temperature

Process of Condensation• Condensation- gas become liquid– Before condensation can occur, relative humidity

must be at 100%

• Saturated- relative humidity at 100%

• Dew Point- temp at which water vapor condenses

What’s the Difference?

• Dew- when water vapor condenses on a given surface

• Fog-cloud with ground surface contact

• Clouds- moist air and particles rise quickly, cool, and condense

Assignment Day 1

• 1. What is the difference between relative humidity and humidity?

• 2. What are the two ways relative humidity can be affected?

• 3. What does relative humidity at 75% mean?• Calculate The Relative Humidity:– 4. Possibly Humidity-64G, Current Humidity-16G– 5. Possible Humidty-96G, Current Humidity 24G

AIR MASSES AND FRONTS

Types of Clouds• Cumulus– Puffy, white, mid-level clouds

• Stratus– Thin, long-layered, low-level clouds

• Cirrus– Feathery white clouds at high altitudes

Prefixes for Clouds• Add these to the front of the cloud types for a

new cloud formation– Strato- low level clouds

– Alto- mid level clouds

– Cirro- high clouds

– Nimbo/Nimbus- storm cloud

• Air Mass- large body of air with similar temp and moisture– Cold masses bring cold weather, Warm masses

bring warm weather

• Front- boundary formed between two different air masses– Four types

• Cold Front- cold mass meets and pushes warm air masses up

• Warm Front- warm air mass meets and moves over top of a cold air mass (brings precip)

• Occluded Front- fast moving cold mass over takes a slow warm front and slight warmer cold front, pushing them upward (Lots of Precip)

• Stationary Front- cold air mass and a warm air mass meet. Neither move up or down

Assignment Day 2

• 1. What is the relationship between air masses and front?

• 2. What are the four types of fronts?• 3.What kind of front occurs when two masses

meet and neither overtakes the other?• 4. What kind of front occurs when warm air

meets cold air and overtakes it?• 5. What kind of front occurs when cold air over

takes two masses at once?

FORECASTING WEATHER

Technology• Thermometer- measures temp

• Barometer- measures air pressure

• Wind Vane/Sock- measures wind direction

• Anemometer- measures wind speed

Eyes in the Sky• Weather balloons carry forecasting equipment

as high as 30km– Temp, pressure, humidity

• Radar is used to find location, movement, intensity of precip

Weather symbols used on

Weather Maps

• Isobars- lines on weather map that connect areas of equal pressure

Assignment Day 3• 1. What are at least three tools for collecting

weather data?• 2. How high can weather balloons travel?• 3. For what reasons would you use radar?• 4. How to isobars help when reading a

weather map?• 5. Why would meteorologists compare new

maps with ones 24hrs old?– (what could they be monitoring?)

REASON FOR THE SEASONS

What are the reasons for the seasons?DO NOW:

• Give a guess as what you think are the reasons for the seasons here on Earth?

The seasons are caused as the Earth, tilted on its axis, travels in a loop around the Sun each year. Summers happens in the hemisphere tilted towards the sun, and Winter happens in the hemisphere tilted away.

• Bill Nye-Seasons

SEVERE WEATHER