November 10, 2011

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

________________

Remember 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 risesAi

r mov

es in

Air co

ols off

and s

inks

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 -