Master Plan
Nashua Fire Rescue, NH
Figure 24. Saffir-Simpson Hurricane Damage Scale
Wind Estimate Typical Damage
Cat 1 74-95 mph
Cat 2 96-110 mph
Cat 3 (Major) 111-129 mph
Cat 4 (Major) 130-156 mph
157 mph or
Cat 5 (Major) Higher
Very dangerous winds will produce some damage: Well-
constructed frame homes could have damage to roof,
shingles, vinyl siding and gutters. Large branches of trees will
snap and shallowly rooted trees may be toppled. Extensive
damage to power lines and poles likely will result in power
outages that could last a few to several days.
Extremely dangerous winds will cause extensive damage: Well-
constructed frame homes could sustain major roof and siding
damage. Many shallowly rooted trees will be snapped or
uprooted and block numerous roads. Near-total power
Devastating damage will occur: Well-built framed homes may
incur major damage or removal of roof decking and gable
ends. Many trees will be snapped or uprooted, blocking
numerous roads. Electricity and water will be Unavailable for
several days to weeks after the storm passes.
Catastrophic damage will occur: Well-built framed homes can
sustain severe damage with loss of most of the roof structure
and/or some exterior walls. Most trees will be snapped or
Uprooted and power poles downed. Fallen trees and power
poles will isolate residential areas. Power outages will last weeks
to possibly months. Most of the area will be uninhabitable for
weeks or months.
Catastrophic damage will occur: A high percentage of framed
homes will be destroyed, with total roof failure and wall
collapse. Fallen trees and power poles will isolate residential
areas. Power outages will last for weeks to possibly months. Most
of the area will be uninhabitable for weeks or months.
Strong winds can damage power, telephone, and satellite communications for energy pipelines in the area.
Commercial and residential occupancies can also lose power and communications. Severe damage can be
caused to structures, power lines, and critical infrastructure. NOAA reports that one recorded hurricane
passed through Nashua in 1954.
ESC) Emergency Services
Consulting International
26
