Wind

Measuring Wind Instruments – And Units: or Named for the direction from which the wind comes Ex. SE wind – comes from the southeast and blows toward the northwest Anemometer (speed) Knots (kts)mi/hr Wind Vane (direction)

The aerovane (skyvane).

Definition Horizontal movement of air due to differences in due to the unequal heating of the earth Wind flows from to pressure Size of the pressure gradient dictates the force of the wind. The higher the gradient, the the winds. air pressure Highlow stronger

Global Winds What is the name we give motion due to earth’s rotation? ________________________ Because Earth is spinning, wind curves to the ________ in the northern hemisphere and to the left in the southern hemisphere Coriolis Effect right

Global Winds If earth did not spin, the air movement would look like this. Air would rise at the equator and sink at the poles due to differences in temperature

Global Winds But the earth does spin, so winds get deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. Creates three Giant circulation cells in each Hemisphere ESRT Page 14 Will do more with this in the climate unit

As air moves from high to low pressure in the northern hemisphere, it is deflected to the right by the Coriolis forcehighlow

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Low and High Pressure Systems

Low Pressure System = Cyclone Winds are counterclockwise and inward Winds converge or go into the center Air is forced up, expands, cools to dew point, condenses and clouds form

Jet Stream Area of high wind speeds in the upper troposphere. The jet stream generally moves __________ to __________ Jet Streams steer storms Most low pressure systems move from the SOUTHWEST TO NORTHEAST IN NEW YORK STATE, ESRT p14 WEST EAST

High Pressure = Anticyclone Winds are clockwise and outward Winds diverge or move away from the center High pressure is more dense so air sinks High Pressure is associated with fair/nice weather

LOCAL BREEZES

Sea/Land Breezes – caused by the unequal heating of land and water Water heats up longer because of its high specific heat Land heats up quicker due to its lower specific heat

Sea Breeze Sun heats the land Warm air rises b/c less dense Low pressure Air is cooler over ocean Air is more dense High pressure wind

Land Breeze Sun is down Land cools down quicker Air is more dense High Pressure Air is warmer over ocean Air is less dense Low Pressure wind

u2RRkhttp:// u2RRk Vu2CE&feature=relatedhttp:// Vu2CE&feature=related

Do not play US1rohttp:// US1ro More coriolis on utube /mtr/fw/crls.rxmlhttp://ww2010.atmos.uiuc.edu/(Gh)/guides /mtr/fw/crls.rxml