Winter Weather
Entire jurisdiction.
Depth of snow in a given time
frame (ex. 2 or more inches per
hour over a 12 hour period).
Blizzard—violent snowstorm
with minimum winds of 35 mph
and visibility less than % mile for
3 hours.
Ground snow load factor.
Ice Storm—Sperry-Piltz Ice
Accumulation Index:
@ O-—little impact
e 5-—catastrophic damage
to exposed utility
systems
For full definitions of Sperry-Plitz
Ice Accumulation Index, see
Section 3.5 Vulnerability by
Hazard
Disruption to road network.
Damage to trees and power
lines, communications, gas line
Structural damage to
roofs/collapse.
Increase in CO, other hazards.
torms and Space Weather
Entire jurisdiction
Solar flares—violent explosions
in the sun’s atmosphere.
Solar radiation storms—elevated
levels of radiation that occur
when the numbers of energetic
particles increase.
Geomagnetic storms—
explosions in the corona region
of the sun.
Space weather can produce
electromagnetic fields that
induce currents in wires,
disrupting power lines and
causing widespread power
outages.
Severe space weather can
produce solar energetic
particles, which can damage
satellites used for
communications, global
