TORNADOES PART 5: LEARNING FROM GLOBAL DISASTER LABORATORIES
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Transcript of TORNADOES PART 5: LEARNING FROM GLOBAL DISASTER LABORATORIES
“THE TORNADO SEASON”
• The “tornado season” is late winter
through midsummer,….
• But tornadoes can happen any time of
the year and in any state when the
atmospheric conditions are right.
• Unusual numbers of tornadoes are a
consequence of La Nina, the cooling of
the Pacific Ocean, which can cause
global changes in weather patterns.
NATIONS THAT NEED TO BECOME
TORNADO DISASTER RESILIENT
• USA (especially in the states
identified as “Tornado Alley”)
• AUSTRALIA (rare, but
occasionally)
WIND AND WATER
PENETRATE BUILDING
ENVELOPE
TORNADOES
UPLIFT OF ROOF SYSTEM
FLYING DEBRIS (all sizes and
shapes)
REGIONAL STORM CELLS
HEAVY PRECIPITATION AND
HAIL STONES
NO WARNING
(MUDFLOWS)
NO SAFE “SAFE HAVENS”
CAUSES
OF RISK
GLOBAL
DISASTER
LABORATORIES
TYPICAL SOCIOECONOMIC
IMPACTS
• Little or no warning; no time for
effective evacuation
• Downed trees
• Power outages
• Damaged cars and trucks
• Roofs ripped off; buildings
destroyed
TYPICAL SOCIOECONOMIC
IMPACTS
• Houses, businesses,
warehouses, shopping malls,
schools, and hospitals
damaged and/or destroyed
• Major roads blocked by debris
• Airports and train stations
closed
WE CONTINUE TO OPERATE WITH
A FLAWED PREMISE:
TORNADO DISASTERS, WHICH ARE
SEASONAL EVENTS THAT OCCUR
ANNUALLY IN THE UNITED
STATES ARE WELL UNDERSTOOD;
THEREFORE TORNADO DISASTER
RESILIENCE IS SHOULD BE
RELATIVELY EASY.
FACT: TORNADO DISASTERS ARE
COMPLEX, MAKING TORNADO
DISASTER RESILIENCE A VERY
ELUSIVE GOAL TO ACHIEVE
THIRTY TO FORTY
TORNADOES STRIKES FIVE
SOUTHERN STATES
Mississippi, Alabama, Arkansas, Kentucky, and Tennessee
54 dead
FEBRUARY 5, 2008
TORNADOES STRIKE IOWA
AND MINNESOTA
Continuation of the deadliest tornado season in a decade
May 25, 2008
Although far from the so-called
"Tornado Alley," a region that falls
generally in the southern plains of
Texas, Okla. and Kan., the greater
Midwest also experiences a large
number of tornadoes each year.
A major difference is that Midwestern tornadoes are more likely to form late at night and in colder months than those in “Tornado Alley.”
. For example, Indiana
experiences only about 20
tornadoes a year, compared
to about 52 in Oklahoma. and
124 in Texas.
LESSON: THE TIMING OF
ANTICIPATORY ACTIONS IS VITAL
• The people who know: 1) what to
expect (e.g., high-velocity winds,
rain, hail), 2) where and when the
toudh down will happen, and 3)
what they should (and should not)
do to prepare will survive.
LESSON: TIMELY EARLY WARNING
AND EVACUATION SAVES LIVES
• The people who know that they may
have little or no warning and still
can get out of harm’s way will
survive.
LESSON: WIND ENGINEERED
BUILDINGS SAVE LIVES
• Buildings with roof systems and
facads engineered to withstand a
tornado’s high velocity winds will
protect occupants and users from
death and injury.
WHEN IMPLEMENTED, THE
TORNADO “SAFE ROOM” IS A
RECENT INNOVATION THAT IS MORE
EFFECTIVE THAN THE WELL KNOWN
CELLAR IN SAVING LIVES
LESSON: EMERGENCY RESPONSE
SAVES LIVES AND PROTECTS
• The timing of emergency response
operations is vitally important for
search and rescue and provision of
emergency services to save lives
and protect property.