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: NASA balloons begin flying in Antarctica for 2014 campaign

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

Scientists make strides in tsunami warning since 2004

Dec 19, 2014

The 2004 tsunami led to greater global cooperation and improved techniques for detecting waves that could reach faraway shores, even though scientists still cannot predict when an earthquake will strike.

Trade winds ventilate the tropical oceans

Dec 19, 2014

Long-term observations indicate that the oxygen minimum zones in the tropical oceans have expanded in recent decades. The reason is still unknown. Now scientists at the GEOMAR Helmholtz Centre for Ocean Research ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.