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2012 changes to the Saffir-Simpson wind scale

Posted: Thu Apr 05, 2012 7:30 am
by Florida Beach Gal
Here are a few changes for the upcoming hurricane season:

Category 4 on the SSHWS will be broadened by one mph at each end of the range, yielding a new range of 130-156 mph. This will also result in a minor modification of the Category 3 and 5 wind speed thresholds. The SSHWS will change as follows:
From:
Category 3: 111-130 mph (96-113 kt, 178-209 km/h)
Category 4: 131-155 mph (114-135 kt, 210-249 km/h)
Category 5: 156 mph or higher (136 kt or higher, 250 km/h or higher)
To:
Category 3: 111-129 mph (96-112 kt, 178-208 km/h)
Category 4: 130-156 mph (113-136 kt, 209-251 km/h)
Category 5: 157 mph or higher (137 kt or higher, 252 km/h or higher)
There will be no change to the wind speeds currently assigned to Categories 1 and 2.
With this change, a 115-kt Category 4 hurricane will have its intensity properly converted to mph and rounded to the nearest 5 mph (130 mph) and remain within the Category 4 mph range.
Important note: Since intensities are assigned using 5-kt increments, neither storms in the historical record nor any future storms will have their SSHWS category changed as a result of this modification to the scale.

Re: 2012 changes to the Sasffir-Simpson wind scale

Posted: Fri Apr 06, 2012 7:57 am
by Kit Kat
Why would they change the winds after all of these years?

Re: 2012 changes to the Saffir-Simpson wind scale

Posted: Thu Apr 19, 2012 3:19 pm
by Kitty
my guess it to round the numbers? A category four now starts at 130 mph instead of 131 mph. Just a guess.

Re: 2012 changes to the Saffir-Simpson wind scale

Posted: Tue Apr 24, 2012 9:28 pm
by Caribbean Traveler
You are right Kitty. The hurricane did some research and the new numbers are less confusing.