1. NSF North Mississippi GK-8 Weather!

2. Temperature You will usually see temperature measured in °F for maps of the United States Maps of foreign countries will usually be measured in °C

3. NSF North Mississippi GK-8 Relative Humidity The relative humidity tells us how full 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.

4. NSF North Mississippi GK-8 High and Low Pressure Areas 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

5. NSF North Mississippi GK-8 Fronts A front is the boundary separating air masses of different densities Fronts extend both vertically and horizontally in the atmosphere

6. NSF North Mississippi GK-8 Types of Fronts 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

7. NSF North Mississippi GK-8 Types of Fronts 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

8. NSF North Mississippi GK-8 Types of Fronts 3. Stationary Front: When either a cold or warm front stops moving When the front starts moving again it returns to either being a cold or warm front

9. NSF North Mississippi GK-8 Types of Clouds 1. High-Level Clouds: Usually found at greater than 20,000 ft. Usually made of ice crystals Examples include Cirrus, Cirrostratus

10. NSF North Mississippi GK-8 Types of Clouds 2. Low-Level Clouds: Usually found lower than 6,500 ft. Low, lumpy clouds that produce weak to moderate precipitation, cover sky like a blanket Examples Stratus

11. NSF North Mississippi GK-8 Types of Clouds 3. 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

12. NSF North Mississippi GK-8 Weather Maps: Pressure & Temperature

13. NSF North Mississippi GK-8 Weather Maps: Doppler Radar Maps

14. NSF North Mississippi GK-8 Summary 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

15. NSF North Mississippi GK-8 Summary (continued) types of fronts: 1. Cold 2. Warm 3. Stationary types of clouds: 1.cirrus 2. stratus 3. cumulus

16. NSF North Mississippi GK-8 Sources 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 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 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