1. PRECIPITATION HONORS EARTH SCIENCE Pages 459-464

2. PRECIPITATION Any moisture that falls from the sky Any moisture that falls from the sky

3. DEVELOPMENT OF PRECIPITATION Water Vapor(condenses) → cloud droplet → coalescence → too heavy→FALL → precipitation Water Vapor(condenses) → cloud droplet → coalescence → too heavy→FALL → precipitation Coalescence- drop collides with smaller drops and they combine Coalescence- drop collides with smaller drops and they combine

4. Title this diagram

6. Rain drop shapes X

8. Forms of precipitation Rain Rain –Liquid –.5-5 mm –Drizzle ≤.5 mm ≤.5 mm

9. FORMS OF PRECIPITAION SNOW SNOW –Solid Plates or columns Plates or columns Six sided flakes Six sided flakes 1”rain=10”snow 1”rain=10”snow(generally)

11. FORMS OF PRECIPITAION Sleet Sleet –Ice pellets –Melting layer wedged between 2 freezing layers ground Above 32 F melts sleet Below 32 F snow

12. sleet

13. Sleet- season?

14. Sleet pictures

15. FORMS OF PRECIPIATION GLAZE (freezing rain) GLAZE (freezing rain) –Rain freezes when it hits cold surfaces

17. FORMS OF PRECIPIATION HAIL HAIL Forms in cumulonimbus clouds Forms in cumulonimbus clouds Gets “stuck” in cloud Gets “stuck” in cloud Every trip up the cloud adds a layer of ice Every trip up the cloud adds a layer of ice Season? Season?

18. Hail pictures

19. RADAR Sends signal out (microwaves) and bounces off precipitation Sends signal out (microwaves) and bounces off precipitation

20. Radar towers

21. Radar maps

22. 6:32 PM GMT on November 27, 2011

23. GMT (Greenwich mean time) - 5 hours for EST - 5 hours for EST Uses military time Uses military time Example- 2:00 GMT MI time? Example- 2:00 GMT MI time?

24. FOG Not precip Not precip “Ground clouds” “Ground clouds” –Need same conditions Usually forms from warm ground and colder air Usually forms from warm ground and colder air

25. Lake Effect Snow When cold air travels over warm water When cold air travels over warm water Snow falls on downwind shore Snow falls on downwind shore