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pressure gradient force

causes air to move from a higher pressure toward lower pressure

horizontal pressure differences

caused by temperature differences

the gas law formula

pressure=temp x density x constant

the gas law

temp increases, density decreases if pressure is constant.

coriolis force

constantly pulling the wind to its right in NH and left in SH

horizontal pressure changes

much less than vertical. wind blows from high pressure

sea pressure correction

10 mb for 100 m above sea levels. always add on pressure if going down to sea level.

large scale (synoptic) weather systems

winds blow counterclockwise around the low pressure system in norther hemisphere.

pressure gradient force winds

high to low pressure

coriolis force winds

directed to the right

subtropical highs

air from equator creates an area of high pressure


air moves toward the poles and deflects toward the east, resulting in westerly flow

polar easterlies

polar air deflected by the coriolis force resulting in a NE flow

high pressure areas

near lat. 30 latitudes and near the poles

low pressure areas

near the equator and at 60 latitudes

jet streams

air currents thousands of miles long, hundreds of miles wide. wind speed can exceed 100 mph. found near the tropopause.

isobaric surface

constant pressure surface

cyclonic flow

southern hemisphere, counterclockwise

anticyclones flow

clockwise, northern hemisphere

horse latitudes

weak winds

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