Good Effort Team Mark.
On Thu, Dec 12, 2013 at 3:15 AM, Mark Cupitt <markcup...@gmail.com> wrote: > Hi All > > Whilst looking at our areas and the overlaid track of the Typhoon, I was > reminded of some information that I thought I would share with all > concerned. I was reminded of this by one of our team members. > > 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. > > To illustrate > > Typhoon is travelling East to West at 15 knots with wind speeds of 150 > knots. > Because of the counter clockwise rotation, the actual winds North of the > track will be wind-speed + the speed over ground of the typhoon, in our > example, 150 + 15 = 165 knots > On the south side of the track, it will be the reverse as we subtract the > travel of the typhoon from the wind speed as it is travelling "with" the > typhoon, in our example 150 - 15 = 135 knots. > Now this may seem insignificant, but realize that the difference between > the north side of the track and south side is actually 30 knots. This can > make a significant difference in damage assessment. > > The strongest adjustments will be at 90 degrees to each side of the track > with no adjustment on the actual track location itself, and proportionally > in between the two positions. > > The Southern hemisphere is simply the reverse. > > When prioritizing mapping efforts, the initial areas to focus on would be > 90 degrees to the north of the track in the Northern hemisphere and 90 > degrees south of track in the Southern Hemisphere to look for the areas > with the most likely damage > > The faster the typhoon is travelling over the ground, the greater this > effect is. > > Hope this is useful > > Regards > > Mark Cupitt > > "If we change the world, let it bear the mark of our intelligence" > > See me on LinkedIn <http://ph.linkedin.com/in/markcupitt> > > *See me on StackExchange <http://gis.stackexchange.com/users/17846/mark-c>* > > > =============================================================================================== > The contents of this email are intended only for the individual(s) to whom > it is addressed and may contain > confidential or privileged information. If you are not the intended > recipient, you must not disclose, copy, distribute, > or use the contents of this email. If you have received this email in > error, please notify the sender immediately and > delete the email and any attachments. > =============================================================================================== > > > _______________________________________________ > talk-ph mailing list > talk-ph@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-ph > > -- Blessings, Art Trillanes Esmeralda Jr cell: +973. 369.55199 tetra: +973. 175.72819 "“Education isn’t about telling people stuff, it’s about giving them tools that enable them to see the world in a new and useful way.”
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