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General Discussion >> Hurricane Ask/Tell
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LI Phil
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Posts: 2637
Loc: Long Island (40.7N 73.6W)
Re: Coriolis
      Wed Aug 25 2004 06:04 PM

Geostrophic Wind: winds balanced by the Coriolis and Pressure Gradient forces.

An air parcel initially at rest will move from high pressure to low pressure because of the pressure gradient force (PGF). However, as that air parcel begins to move, it is deflected by the Coriolis force to the right in the northern hemisphere (to the left on the southern hemisphere). As the wind gains speed, the deflection increases until the Coriolis force equals the pressure gradient force. At this point, the wind will be blowing parallel to the isobars. When this happens, the wind is referred to as geostrophic.

Winds in nature are rarely exactly geostrophic, but to a good approximation, the winds in the upper troposphere can be close. This is because winds are only considered truly geostrophic when the isobars are straight and there are no other forces acting on it -- and these conditions just aren't found too often in nature.

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Entire topic
Subject Posted by Posted on
* Question about Hurricane Alex Keith234 Wed Aug 25 2004 06:04 PM
. * * Re: Question about Hurricane Alex LI Phil   Tue Aug 24 2004 10:01 PM
. * * Re: Question about Hurricane Alex Keith234   Tue Aug 24 2004 10:19 PM
. * * Re: Question about Hurricane Alex Clark   Tue Aug 24 2004 11:42 PM
. * * Re: Question about Hurricane Alex LI Phil   Wed Aug 25 2004 01:43 AM
. * * Re: Coriolis Ed DunhamAdministrator   Wed Aug 25 2004 02:11 AM
. * * Re: Coriolis Keith234   Wed Aug 25 2004 12:53 PM
. * * Re: Coriolis LI Phil   Wed Aug 25 2004 06:04 PM
. * * Geostrophic Winds Keith234   Thu Aug 26 2004 01:29 AM
. * * Re: Geostrophic Winds LI Phil   Thu Aug 26 2004 01:33 AM
. * * Re: Geostrophic Winds Clark   Thu Aug 26 2004 02:27 AM
. * * Re: Question about Hurricane Alex Keith234   Wed Aug 25 2004 01:55 AM
. * * Re: Question about Hurricane Alex Keith234   Wed Aug 25 2004 12:52 AM

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