PRECIPITATION HONORS EARTH SCIENCE Pages 459 464 PRECIPITATION

PRECIPITATION HONORS EARTH SCIENCE Pages 459 -464

PRECIPITATION • Any moisture that falls from the sky

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

Title this diagram

Rain drop shapes X

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

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

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

sleet

Sleet- season?

Sleet pictures

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

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

Hail pictures

RADAR • Sends signal out (microwaves) and bounces off precipitation

Radar towers

Radar maps

Radar maps 6: 32 PM GMT on November 27, 2011

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

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

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