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Five one in 1,000 year event. this holds more moisture and we're seeing these rain events. it's not over with. we need the rain in some parts of new england and that's where it's going where they've had flash droughts. there could be good news to this. flash flooding as well expected. >> tom, a lot of folks in the west would love to see some of that rain. >> they would. >> for sure, the drought situation really serious. thank you stow much for bringing that to us to keep people safe in their communities. we're learning new details about the man police say stole a plane and threatened to cras...

>> yeah, so fema's maps right now are really focused on riverene flooding and coastal flooding. our maps, and we work with local jurisdictions to update the map when they ask us to provide additional assistance to update them. i think the part that's really difficult right now is the fact that our flood maps don't take into account excessive rain that comes in when we're seeing these record rainfalls that are happening. st. louis, right, record rainfall of over 100 years that when you have that amount of rain per hour, that's what our flood maps don't necessarily take into consideration. >> so...

>> reporter: fast flowing, fast rising flash floods, a common seen this summer with 1,000 year rain events striking in multiple states. cnn collected data from local and federal flood agencies and found significant portions of communities that saw floods of biblical proportions this summer were outside of what fema considers high risk flood zones. >> people should not rely on fema flood maps in this age of climate change because the flood maps only look backwards. they look at historical flooding. >> reporter: property owners, local and state governments use fema maps to determine risk and mak...

There was a worse drought back ten years ago, 90% of the state was in drought back then. now it's maybe 60%. the reservoir is close to 70% full. it's not as bad as what we're seeing out west on the colorado river. >> one thing, it feels like it's happening more and more often. and i know lately, we've had, in one week along, three 1 in 1,000-year rain events, st. louis, eastern kentucky, illinois, you saw the events happening. so when people do ask, is this the new normal, what is the answer? >> yes. this is it. this is what we've been predicting, scientists have been predicts for generations ...

But some texans getting more than what they bargained for. floodwaters soaking homes an rearranging furniture. >> it looked like a roaring rapid river. i had never experienced that before. >> a new normal with extreme rain events the result of climate change. eastern kentucky and southeast illinois and death valley and now the dallas area all drenched by once in a thousand year floods just in the past few weeks. >> sam brock reporting there. it is a busy primary day today and yes, steve kornacki has taken his position at the big board. he will join us after a quick break. ♪♪ ♪♪ ♪♪ ...