[HOT] [talk-ph] Typhoon Wind Speeds

David Hiers davidhiers7836 at yahoo.com
Thu Dec 12 20:21:37 UTC 2013

While considering the macro-scale variation in wind speed, you would do well to not overlook the highly localized orographic effects on wind speed and associated damage.  The effect of local topology on wind speed is sufficiently strong and well-understood to drive zoning regulations:




 From: Eugene Alvin Villar <seav80 at gmail.com>
To: Mark Cupitt <markcupitt at gmail.com> 
Cc: osm-ph <talk-ph at openstreetmap.org>; "HOT at OSM (Humanitarian OpenStreetMap Team)" <hot at openstreetmap.org> 
Sent: Thursday, December 12, 2013 3:02 AM
Subject: Re: [HOT] [talk-ph] Typhoon Wind Speeds

On Thu, Dec 12, 2013 at 9:15 AM, Mark Cupitt <markcupitt at gmail.com> wrote:

In the Northern Hemisphere, Typhoons rotate in a Counter Clockwise Direction, so the actual wind on the ground has to be factored with the speed of travel of the typhoon itself. The faster the speed over ground of the typhoon, the more wind that will be added or subtracted over the ground depending on what position within the circulation a specific point is.

This is why the northeast quadrant of typhoons (which typically move northwest) in the Philippines are considered the "strong side". For example check out this news article containing a quote from NASA:


"US-based National Aeronautics and Space Administration (NASA) warned 
that Manila may receive a lashing from super typhoon Yolanda's strongest side, its northeastern quadrant."

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