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

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

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

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

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

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

relative humidity

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

2

Temp increases -> moves apart -> holds more H2O

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

Do you use the dew?

Isotherms: Lines drawn to show areas of similar temperature

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.

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

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

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

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

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

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?

Isotherm Practice:

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

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

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?