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Weather!. Matt Aufman NSF North Mississippi GK-8 November 2005. Relative Humidity. The relative humidity tells us how “full” of moisture the air is at the time of measurement.

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Weather

Weather!

Matt Aufman

NSF North Mississippi GK-8

November 2005

NSF North Mississippi GK-8


Relative Humidity

  • The relative humidity tells us how “full” of moisture the air is at the time of measurement.

  • For example, 90% relative humidity means that at that moment the air is holding 90% of the maximum amount of water it could.

NSF North Mississippi GK-8


If the air is at 100-percent relative humidity, sweat will not evaporate into the air. As a result, we feel much hotter than the actual temperature when the relative humidity is high.

NSF North Mississippi GK-8


NSF North Mississippi GK-8


SO…. temperature of the air _____.

  • Cold air cannot hold as much _____ _____ as warm air.

    Draw this.

    Cold air is more dense than warm air.

NSF North Mississippi GK-8


NSF North Mississippi GK-8


NSF North Mississippi GK-8


Cloud Cover Symbols 50 %.  Write a short paragraph that explains your picture.

  • You will often see the circles drawn on a weather map

NSF North Mississippi GK-8


High and Low Pressure Areas 50 %.  Write a short paragraph that explains your picture.

  • High pressure causes air to sink

  • Usually results in several days of clear sunny skies

  • Air rises in low pressure areas and forms water droplets

  • Usually results in rain and storms

NSF North Mississippi GK-8


Air Masses 50 %.  Write a short paragraph that explains your picture.

There are two types of air masses:

1. Continental Polar air masses

2. Maritime Tropical air masses

NSF North Mississippi GK-8


Fronts 50 %.  Write a short paragraph that explains your picture.

A front is the boundary separating air masses of different densities

  • Fronts extend both vertically and horizontally in the atmosphere

NSF North Mississippi GK-8


Fronts: Five Types of Fronts 50 %.  Write a short paragraph that explains your picture.

1.Cold Front: The zone where cold air is replacing warmer air

  • In U.S., cold fronts usually move from northwest to southeast

  • Air gets drier after a cold front moves through

NSF North Mississippi GK-8


Fronts: Five Types of Fronts 50 %.  Write a short paragraph that explains your picture.

2.Warm Front: The zone where warm air is replacing colder air

  • In U.S., warm fronts usually move from southwest to northeast

  • Air gets more humid after a warm front moves through

NSF North Mississippi GK-8


Fronts: Five Types of Fronts 50 %.  Write a short paragraph that explains your picture.

3.Stationary Front: When either a cold or warm front stops moving

  • When the front starts moving again it returns to either being acoldor warm front

NSF North Mississippi GK-8


Fronts: Five Types of Fronts 50 %.  Write a short paragraph that explains your picture.

4.Occluded Front: Formed when a cold front overtakes a warm front

  • This occurrence usually results in storms over an area

  • In U.S., the colder air usually lies to the west

NSF North Mississippi GK-8


Fronts: Five Types of Fronts 50 %.  Write a short paragraph that explains your picture.

5.Dry Line (Dew Point Front): Boundary separating a dry air mass from a moist air mass

  • This occurrence can result in tornadoes being formed

  • Usually found in western part of U.S.

NSF North Mississippi GK-8


Clouds: Five Types of Clouds 50 %.  Write a short paragraph that explains your picture.

1. High-Level Clouds: Usually found at greater than 20,000 ft.

  • Usually made of ice crystals

  • Examples include Cirrus, Cirrostratus

NSF North Mississippi GK-8


Clouds: Five Types of Clouds 50 %.  Write a short paragraph that explains your picture.

2. Mid-Level Clouds: Usually found between 6,500 and 20,000 ft.

  • Usually made of water droplets, but can be made of ice

  • Example is altocumulus

NSF North Mississippi GK-8


Clouds: Five Types of Clouds 50 %.  Write a short paragraph that explains your picture.

3. Low-Level Clouds: Usually found lower than 6,500 ft.

  • Low, lumpy clouds that produce weak to moderate precipitation

  • Examples include Nimbostratus and Stratocumulus

NSF North Mississippi GK-8


Clouds: Five Types of Clouds 50 %.  Write a short paragraph that explains your picture.

4. Vertically developed: These clouds are thick and puffy and extend very far upwards

  • Examples include Cumulonimbus and Fair Weather Cumulus

  • Ordinary Cumulus clouds can quickly become Cumulonimbus clouds that start strong thunderstorms

NSF North Mississippi GK-8


Clouds: Five Types of Clouds 50 %.  Write a short paragraph that explains your picture.

5. Other: These are miscellaneous clouds

  • These clouds do not really fit into any category, and all have different characteristics

  • Examples include billow clouds, contrails, mammatus, orographic, and pileus

NSF North Mississippi GK-8


Weather Maps: Pressure & Temperature 50 %.  Write a short paragraph that explains your picture.

NSF North Mississippi GK-8


Weather Maps: Doppler Radar Maps 50 %.  Write a short paragraph that explains your picture.

NSF North Mississippi GK-8


Summary 50 %.  Write a short paragraph that explains your picture.

  • Temperature: Usually in °F, need to convert to °C

  • High pressure areas cause sunny weather; low pressure areas cause rain and storms

  • Two Types of air masses:

    1. Continental Polar

    2. Maritime Tropical

NSF North Mississippi GK-8


Summary (continued) 50 %.  Write a short paragraph that explains your picture.

  • Five types of fronts:

    1. Cold

    2. Warm

    3. Stationary

    4. Occluded

    5. Dew Point (Dry Line)

  • Five types of clouds:

  • 1. High Level

  • 2. Mid Level

  • 3. Low Level

  • 4. Vertically developed

  • 5. Miscellaneous

NSF North Mississippi GK-8


Sources 50 %.  Write a short paragraph that explains your picture.

  • Palmer, Chad and Evans, David. May 20, 2005. Occluded fronts can

  • signal weakening of storm. Accessed 28 October 2005. http://www.usatoday.com/weather/tg/wofront/wofront.htm

  • Palmer, Chad and Kepple, Kevin. May 20, 2005. High-pressure systems

  • brings sunny days. Accessed 27 October 2005.

  • http://www.usatoday.com/weather/tg/whighp/whighp.htm

  • Palmer, Chad and Kepple, Kevin. May 20, 2005. How low pressure

  • systems affect weather. Accessed 27 October 2005. http://www.usatoday.com/weather/tg/wlowpres/wlowpres.htm

  • Weather World 2010, University of Illinois. No date of publication

  • given. Reading and Interpreting Weather Maps. Accessed 21 October 2005. http://ww2010.atmos.uiuc.edu/(Gh)/guides/maps/home.rxml

NSF North Mississippi GK-8


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