precipitation honors earth science pages 459-464
TRANSCRIPT
PRECIPITATIONPRECIPITATION
HONORS EARTH SCIENCEHONORS EARTH SCIENCE
Pages 459-464Pages 459-464
PRECIPITATIONPRECIPITATION
•Any moisture that Any moisture that falls from the skyfalls from the sky
DEVELOPMENT OF PRECIPITATIONDEVELOPMENT OF PRECIPITATION
• Water Vapor(condenses)Water Vapor(condenses)→ cloud → cloud droplet → coalescence → too heavy→FALL droplet → coalescence → too heavy→FALL → precipitation→ precipitation
• Coalescence- drop collides with smaller drops Coalescence- drop collides with smaller drops and they combineand they combine
Title this diagram
Rain drop shapesRain drop shapesX
Forms of precipitationForms of precipitation
•RainRain–LiquidLiquid–.5-5 mm.5-5 mm–DrizzleDrizzle
•≤ ≤ .5 mm.5 mm
FORMS OF PRECIPITAIONFORMS OF PRECIPITAION
•SNOWSNOW– Solid Solid
•Plates or columnsPlates or columns
•Six sided flakesSix sided flakes
•1”rain=10”snow1”rain=10”snow(generally)(generally)
FORMS OF PRECIPITAIONFORMS OF PRECIPITAION
• SleetSleet– Ice pelletsIce pellets
– Melting layer wedged between 2 freezing Melting layer wedged between 2 freezing layerslayers
ground
Above 32 Fmelts
sleetBelow 32 F
snow
sleetsleet
Sleet- season?Sleet- season?
Sleet picturesSleet pictures
FORMS OF PRECIPIATIONFORMS OF PRECIPIATION
• GLAZE (freezing GLAZE (freezing rain)rain)– Rain freezes Rain freezes
when it hits cold when it hits cold surfacessurfaces
FORMS OF PRECIPIATIONFORMS OF PRECIPIATION
•HAILHAIL• Forms in Forms in
cumulonimbus cloudscumulonimbus clouds
• Gets “stuck” in cloudGets “stuck” in cloud
• Every trip up the Every trip up the cloud adds a layer of cloud adds a layer of iceice
• Season?Season?
Hail picturesHail pictures
RADAR RADAR
• Sends signal out (microwaves) and Sends signal out (microwaves) and bounces off bounces off precipitation precipitation
Radar towersRadar towers
Radar mapsRadar maps
Radar mapsRadar maps
6:32 PM GMT on November 27, 2011
GMT (Greenwich mean GMT (Greenwich mean time)time)
• - 5 hours for EST- 5 hours for EST
• Uses military timeUses military time
• Example- 2:00 GMT MI time?Example- 2:00 GMT MI time?
FOGFOG
• Not precipNot precip
• ““Ground clouds”Ground clouds”– Need same Need same
conditionsconditions
• Usually forms from Usually forms from warm ground and warm ground and colder aircolder air
Lake Effect SnowLake Effect Snow
• When cold air When cold air travels over warm travels over warm waterwater
• Snow falls on Snow falls on downwind shoredownwind shore