AZADPAKISTAN2009
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(CNN)A powerful "bomb cyclone" that slammed Colorado with snow and hurricane-force winds is now threatening towns in central United States with heavy rains, flooding and even tornadoes.
The storm's center was over Iowa and Nebraska on Thursday and will continue delivering dangerous weather conditions to 105 million people who are under some sort of watch, warning or advisory as it moves east and then north into Canada.
A bomb cyclone occurs when there is a rapid pressure drop, with a decrease of at least 24 millibars -- a measure of atmospheric pressure -- over 24 hours. This storm dropped 33 millibars from Tuesday into Wednesday.
Track the storm for yourself
Iowa Gov. Kim Reynolds issued a disaster declaration as first responders scrambled to rescue dozens of people from floodwater.
Adding to the misery of those in its path, the bomb cyclone still threatens to bring severe storms, flash flooding, dense fog and possible tornadoes as it treks across the central part of the country.
After massive snow and rain will come , melting of snow = flood dangers
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