1. Today Hand in any work needed. Check the list, if you owe something. Get out a small piece of paper, PUT YOUR NAME ON IT. When bell rings the quiz will start and you will have 1 minute per question to answer

2. Mini Quiz What is wind? –The movement of air caused by uneven heating and pressure. What type of breeze happens during the day? (not the place) Sea Breeze What causes the wind to curve? Coriolis effect (earths rotation) What is the prevailing wind here in NYS? South West What measures wind? Anemometer

3. Synoptic weather Precipitation & Air Masses & Fronts

4. Air pressure High Pressure –Pressures of 1000 mb and above. –Symbolized with an H –Clock-wise winds and outwards –Winds sink at the center. –Nice weather – clear. Low Pressure –Pressures of 900- 1000 mb –Symbolized with an L –Counter-clockwise winds and inwards –Winds rise at the center. –Hurricane –LOUSY weather

5. Air blows it doesn’t suck!! (Like this class) Wind blows High to low!! How do we know this?? –Balloon –If I blow up the balloon where is the high pressure? Where is the low? –If I let go what happens? CAN DEMO?

6. How did this happen? Workers clean these with steam and didn’t open any valves to release pressure… OUTCOME: no job!

7. What is precipitation? Water that falls from the atmosphere. –Can be in any phase of water based on the air temperature. Above 32 o F (0 o C) = Rain Below 32 o F (0 o C) = Snow

8. Types of Precipitation Rain –Liquid precipitation Snow –Frozen precipitation Hail –Snow that melted then refroze Sleet/Freezing Rain –Rain that either freezes on the surface or just before.

9. Air Masses What is an air mass? –Air that has formed into large bodies of uniform temperature and moisture. –Named for where it comes from. MUST have both moisture and temperature in its name… –m = Maritime (wet) –c = continental (dry) –T = tropical (hot), A = Artic (very cold) P = Polar (cold)

10. Air Masses c = Continental (dry) P = Polar (cold) cP cT cA m= Maritime (wet) T = Tropical (warm) mP mT NO mA!! Why?

11. MAP

12. Weather Fronts These are boundaries between air masses and pressures, where most weather events occur. Three types: –Warm Front –Cold Front –Occluded –Hmmm what kind of air is coming with a cold front?

13. Cold Front (DRAW) Notice how sharply the air rises? Where do the clouds form? Cloud Type?

14. Warm front (DRAW) Notice warm air rising, slowly… Where do clouds form? Cloud Type?

15. Occluded (not moving) Notice how the air rises? Where are the clouds? Type of clouds?