1. Overcast, N wind, 25 mph, snow, 29o
QQ: Draw weather barbs for the following conditions:
Overcast, N wind, 25 mph, snow, 29o
Scattered clouds, SE wind, 10 mph, 81o
Mostly cloudy, S wind, 35mph, 45o, showers
Clear, 90o, no wind or precipitation

2. Today’s Objective: I can determine the weather using a weather map.

3. How Many Do You Remember?
fluid
Warm front
Stationary front
Sea breeze
Global winds
Air pressure
High pressure
Land breeze
Occluded front
Barometer
Cold front
Monsoon
Low Pressure

4. Amount of water vapor in the air
humidity
Amount of water vapor in the air

5. Amount of water vapor Leaving = entering Can’t hold any more water
saturation
Amount of water vapor Leaving = entering Can’t hold any more water

6. Relative humidity
The amount of water vapor in the air compared to what it can actually hold

7. relative humidity

8. The temperature that air must cool to for the water to condense
Dew Point
The temperature that air must cool to for the water to condense
Higher humidity= Higher dew point

9. 2

10. Temp increases -> moves apart -> holds more H2O

11. Psychrometer: 30 – 60% Measures relative humidity
Dry bulb gives current temperature.
Wet
30 – 60%
Most comfortable
Evaporation makes temperature cooler.

12. Do you use the dew?

13. Isotherms:
Lines drawn to show areas of similar temperature

14. 10 degree intervals
Label the value
Draw until end of
map or reaches a
loop
4) Never cross, split, or fork
5) If abnormal temperature appears, circle it.

15. Isobars:
lines on a weather map connecting areas with similar air pressure.
Record every 4 mb (millibars)

16. Mapping the pressure:
Work on side with “title_____” for 7/8/08
No lines may cross
Every 4 mb

17. Quick Question:
Constructed Response: How could you determine whether a map was demonstrating isotherms or isobars?

18. Recording air pressure on a map:
Measured in
mm of mercury or
millibars

19. Cold Front
Area where a cold air mass is replaces a warmer air mass.
colder and drier

21. The temp in El Paso is 95. The temp in LA is 79
The temp in El Paso is 95. The temp in LA is 79. What type of weather should El Paso expect in 2 days? Why?

22. Isotherm Practice:

23. Warm Front
Warm air mass replaces colder one
Warmer and more humid

24. Isobars:
lines on a weather map connecting areas with similar air pressure.
Record every 4 mb (millibars)

25. The temp in Memphis is 84. The temp in Chicago is 67
The temp in Memphis is 84. The temp in Chicago is 67. What type of weather should Chicago expect in 2 days? Why?