hurricane advisories
 





Wind Speed
Knots to MPH
Pressure
Millibars to Inches Hg
Safir Simpson Scale

~ Safir Simpson Scale ~
Category Pressure Winds Surge Damage
1 > 28.93 inches 74 - 95 mph 4 - 5 feet Minimal
2 28.50 - 28.91 inches 96 - 110 mph 6 - 8 feet Moderate
3 27.91 - 28.47 inches 111 - 130 mph 9 - 12 feet Extensive
4 27.17 - 27.88 inches 131 - 155 mph 13 - 18 feet Extreme
5 < 27.17 inches > 155 mph > 18 feet Catastrophic


~ Safir Simpson Scale Damage Potential~

Category 1 (74 - 95 mph) Minimal

Damage primarly confined to shrubbery, trees, foliage, and some unanchored homes. No real damage to other structures. Some damage to poorly constructed signs. Low lying coastal roads inundated, some minor pier damage, some small craft in exposed anchorage torn from there moorings.




Category 2 (96 - 110 mph) Moderate

Damage primarly to shrubbery and tree foliage; some trees blown down. Major damage to exposed mobile homes. Some damage to roofing materials of buildings; some window and door damage. Coastal roads and low lying escape routes inland cut by rising water 2 to 4 hours before arrival of hurricane center. Considerable damage to piers. Marinas flooded. Small Craft in unprotected anchorages torn from moorings. Evacuation of some shoreline residences and low lying areas are required. Extensive damage to poorly constructed signs.




Category 3 (111 -30 mph) Extensive

Foliage torn from trees; large trees blown down. Practically all poorly constructed signs blown down. Some damage to roofing materials of buildings some window and door damage. Some structural damage to small buildings. Mobile homes destroyed. Serious flooding at the coast and many smaller structures near the coast destroyed; larger structures near coast damaged by battering waves and floating debris. Low lying escape routes inland cut by rising water 3 to 5 hours before hurricane center arrives. Flat terrain 5 feet or less above sea level flooded inland 8 miles or more. Evacuation of low lying residences within several blocks of the exsisting shoreline might possibly be required with category 3 storms.




Category 4 (131 - 155 mph) Extreme

Shrubs and trees blown down; all signs down. Extensive damage to roofing material windows and doors. Complete failure of roofs on many small residences. Complete destruction of mobile homes. Flat terrain 10 feet or less above sea level flooded inland as far as 6 miles. Major damage to lower floors of structures near shore due to flooding, battering waves, and floating debris. Low lying escape routes inland cut by rising water 3 to 5 hours before hurricane center arrives. Major erosion of beaches. Massive evacuation of all homes within 500 yards of shore possibly required and of single story homes within 2 miles of shore.




Category 5 (greater then 155 mph) Catastrophic

Shrubs and trees blown down; considerable damage to roofs of all buildings; all signs blown down. Very severe and extensive damage to windows and doors. Complete failure of roofs on many homes and industrial buildings. Extensive shattering of glass in windows and doors. Complete failure of some buildings. Small buildings overturned or blown away. Complete destruction of mobile homes. Major damage to lower floors of all structures less than 15 feet above Sea level within 500 feet of shore. Low lying escape routes inland cut by rising water 3 to 5 hours before hurricane center arrives. Massive evacuation of homes on low ground within 5 to 10 miles of shore possibly required.


Enter a "Place, State", US Zip Code or ICAO:


U.S. WX
Tropics
Canada
E - Mail


Copyright 1999-2005 Ameriwx, All rights reserved.
Powered by HAMweather
US Forecasts are Public Domain and derived from the
National Weather Service - (IWIN) and the National Oceanic Atmospheric Administration (NOAA)
Canadian forecasts are obtained from and are copyright of Environment Canada.