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November 10, 2011
Objective:Determine Relative
Humidity and dew point at various places around Riverheads HS
Agenda:Go over Relative
Humidity/dew point worksheet
Go over TestLab: Relative
HumidityWind Notes
How to determine Dew Point & Humidity
Use a sling psychrometer:
1. Find the "dry bulb temp"
2. Subtract the dry and wet bulb.
3. Find the difference on the top
Use the exact same procedure for finding the Relative HumidityCHECK YOUR CHART!!
Moving air is called Wind
231mph @ Mt. Washington, NHApril 12, 1934
http://www.mountwashington.org/about/visitor/recordwind.php
World's Strongest Wind:
Wind
Basic Rules:
1. Warm air rises
2. There is always air
3. Warm air cools off
4. The Sun heats the GROUND
Wind is caused by differences in air
pressure
Wind
Low Pressure
L
High Pressure
HWIND
Wind moves from
________________
to
________________
Remem
ber that...
WindWhich way is it moving??
WindHow about here? ?
Isomaps & Wind
Isobars:connect pointsof equal pressureThe closer the linesthe higher the windspeed.
http://ww2010.atmos.uiuc.edu/(Gh)/wx/surface.rxml
Think of contourmaps made of hills of air...
There is always a more complex map
Global Winds
Same thing; sideways and double
Warm air rises
Air
moves
in
Air co
ols
off
and
sink
s
wind is measured by an anemometer (wind speed) and a wind vane (direction)
Wind moves from areas of high pressure to areas of low pressure
Coriolis Effect: Because the earth is rotating, wind appears to curve.
In the northern hemisphere it curves to the right.
The Rules of Wind
Coriolis Effect
Because the Earth isrotating, the movementof objects appearsto curve.
In the NORTH thecurve is to the right.
coriolis.mov
Weather Instruments
Wind Vaneswind
direction
Thermometers
Temperature
BarometersAir
Pressure
AnemometersWind Speed
Leaning Tower of Pisa Mt. Washington -