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100 year storm?

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What is the 100 year storm i heard about?

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  1. "Have you ever been through a hundred-year storm? Well you may have without realizing it because a hundred year storm is not a hundred years long, it’s simply a storm that is so bad it’s only likely to occur every hundred years. And there have been a lot of them in the past few years which some think may be due to global warming."

    For instance, there was a storm in India which they announced it to be the 100 year storm, it was recent.


  2. From every small town and hamlet to the biggest cities

    engineers talk about 100-year storms.

    Even the larger storms, like hurricanes can come in the 100-year variety. These

    storms are so called because their force is so powerful that they are suppose to

    occur only once every hundred years.

    There are other levels of storms as well. 10 year storms, 20 year storms and

    50 year storms. These are all mixed in with the regularly occurring rain

    showers we all experience.

    The 10, 20, 50 and 100 year storms come in varieties as well. There 10 year

    wind storms and 10 year rain storms. Hail seems to be a special case and could

    occur at any time.

    A fellow by the name of Jafar Korloo has been designing offshore platforms for

    Unocal. He has this to say about 100 year storms, "We're seeing more 100-year

    events happening more often, even every few years."

    To a reasonable human being that would mean they aren’t 100 year events.

    What is not explained at public meetings or in the newspapers is why these 10,

    20, 50 or 100 year events are mentioned at all.

    Well, they are used by engineers in order to inform an uninformed public about

    the costs for certain structures. They can also be used by insurance adjustors

    to determine insurance rates.

    The scales for determining weather are different all over the country.

    The University of Minnesota has this to say about 100-year storms, "A "100-year

    storm" drops rainfall totals that had a one percent probability of occurring at

    that location that year. Encountering a "100-year storm" on one day does nothing

    to change your chances of seeing the same amount of precipitation the very next

    day."

    The Scottsdale Arizona Road Drainage Master Plan tells us this about 100-year

    storms, "A 100-year storm is an event that statistically has a one percent

    chance of occurring in any one given year. If protection from a 100-year storm

    could not be attained for reasons of cost, impact, available land, etc., then a

    10-year level of protection could be used in the design of flood control

    facilities. A 10-year storm has a ten percent chance of occurring in a given

    year."

    It would follow then that if a 10 year storm has a 10 percent chance of

    occurring in a given year that a 20 year storm would have a 20 percent chance.

    Let us follow the logic therefore up to 30 year storms – that would be a 30

    percent chance of occurrence. Now 40, 50, 60, 70 and 80 – that would provide 40

    percent, 50 percent, 60 percent, 70 percent and 80 percent.

    Let’s go all the way with it then and go for 90 and 100. If a 10 year storm

    has a 10 percent chance of occurring in one year then a 90-year storm would have

    a 90 percent chance of occurring and a 100 year storm would have a 100 percent

    chance of occurring.

    But we just read that it only has a 1 percent chance of occurrence.

    Let’s move on to waves at sea. There is also a scale for waves – they come in

    all the levels that storms come in – from 10-year waves to 100-year waves.

    The problem with the present scale is that is has been discovered in the last

    two years that waves at sea are much higher than previously thought on a regular

    basis.

  3. A 100-year storm means there is a 1% chance in any given year that an area will experience a storm of that intensity.  I believe that one answer was incorrect regarding 10-year, 20-year...  It is actually the inverse of what he said.  A 20-year storm means there is a 5% chance, not a 20% chance - that would be a 5-year storm.

    To clarify, look at it mathematically: 1 storm per 100 years (1/100) = 0.01 or 1%, 1/20 = 0.05 or 5%, 1/5 = 0.20 or 20%.

  4. may be a storm that exited for 100 years

                but 100 light years is the distance travelled by light in vaccum in 100 years.
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