Minor adjustment coming to hurricane wind scale

Mar 27, 2012

(AP) -- Government forecasters are making minor changes to several of the categories in the system for describing hurricane strength.

The Saffir-Simpson ranks hurricanes in five categories based on their .

The says an adjustment is needed to ensure the smooth conversion of units of wind speed measurement for public advisories.

The change broadens the Category 4 wind speed range to 130-156 mph, instead of 131-155 mph. That shifts the Category 3 range to 111-129 mph, instead of 111-130 mph.

Category 5 hurricanes will have top winds of 157 mph or higher, instead of a threshold of 156 mph.

Categories 1 and 2 remain unchanged. No historical storm records will be altered.

The change takes effect May 15.

Explore further: Aging Africa

More information: affir-Simpson Hurricane Wind Scale: http://www.nhc.noaa.gov/aboutsshws.php

5 /5 (1 vote)
add to favorites email to friend print save as pdf

Related Stories

Hurricanes: Category 6 listing possible

May 22, 2006

With some scientists saying global warming is causing an increasing frequency and strength of hurricanes, there is a call for a new category of storms.

Meteorologists: Wilma wasn't major

Jan 18, 2006

Meteorologists say Wilma was a less-than-major hurricane as it crossed Florida Oct. 24, leaving nearly 6 million South Floridians without power.

Wilma wreaked havoc with weaker winds

Nov 07, 2005

Hurricane Wilma may have generally wreaked havoc across Florida last month, but meteorologists say it did it with mostly Category 1 wind speeds.

NASA captures a visible image of Cleo's new eye

Dec 08, 2009

The Moderate Imaging Spectroradiometer or MODIS instrument that flies on NASA's Aqua satellite has amazing resolution from space, and captured Cleo's cloudless eye early this morning. Cleo has intensified ...

Recommended for you

Aging Africa

Aug 29, 2014

In the September issue of GSA Today, Paul Bierman of the University of Vermont–Burlington and colleagues present a cosmogenic view of erosion, relief generation, and the age of faulting in southernmost Africa ...

NASA animation shows Hurricane Marie winding down

Aug 29, 2014

NOAA's GOES-West satellite keeps a continuous eye on the Eastern Pacific and has been covering Hurricane Marie since birth. NASA's GOES Project uses NOAA data and creates animations and did so to show the end of Hurricane ...

EU project sails off to study Arctic sea ice

Aug 29, 2014

A one-of-a-kind scientific expedition is currently heading to the Arctic, aboard the South Korean icebreaker Araon. This joint initiative of the US and Korea will measure atmospheric, sea ice and ocean properties with technology ...

User comments : 0