What Is the Saffir-Simpson Wind Scale? The Saffir-Simpson Wind Scale is a categorical classification of hurricanes based on their wind speed, used by the U.S. government's National Hurricane Center. The scale was first used in 2009, though the wind speeds of the categories match the Saffir-Simpson Hurricane Scale (see below). The scale underwent a minor modification in 2012. The categories are Category 1, 2, 3, 4 and 5: Category One Hurricane: Sustained winds 74-95 mph (64-82 kt or 119-153 km/hr). Category Two Hurricane: Sustained winds 96-110 mph (83-95 kt or 154-177 km/hr). Category Three Hurricane: Sustained winds 111-129 mph (96-112 kt or 178-208 km/hr). Category Four Hurricane: Sustained winds 130-156mph (113-136kt or 209-251 km/hr). Category Five Hurricane: Sustained winds greater than 156 mph (136 kt or 251 km/hr). Detailed descriptions of the damage to be expected from each category can be found on the NHC website. What Was the Saffir-Simpson Hurricane Scale? From 1971 until 2008, the NHC used the Saffir-Simpson Hurricane Scale, which also utilized pressure, storm surge and flooding measurements [WikiPedia]. After Hurricane Ike in 2007, which produced a storm surge undeserving to its Category 2 status, the NHC dropped all requirements except wind "to help reduce public confusion about the impacts associated with the various hurricane categories as well as to provide a more scientifically defensible scale." You can read more about this on their website.
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Prior to midweek, severe thunderstorms with damaging winds, downpours and hail will threaten areas from Indiana to Texas.
Millions travel to Washington, D.C. each year to catch a glimpse of the magnificent pink blossoms.
Following rain and snow in the Northwest on Sunday, another storm will take aim at California and the Southwest Monday into Tuesday.
A potent line of thunderstorms will sweep across the Northeast into Saturday night with damaging winds, hail and downpours.
Soaking rain and locally severe thunderstorms will take aim at the eastern United States around the middle of the week.
A large part of South America will be treated to a "ring of fire" solar eclipse on Sunday, but only if the weather cooperates.
After record-shattering warmth baked the mid-Atlantic and Northeast to end the past week, much colder air will settle over the region on Sunday.
A widespread outbreak of severe weather is threatening a large portion of the Midwest.