How a Category 1 Hurricane Like Isaac Can Do Plenty of Damage

Waves crashing on Orange Beach, AL. <a href="https://twitter.com/jen_517/status/240553108638425089/photo/1/large">jen_517</a>/Twitter

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Update 8/29 2:15 EDT: Hurricane Isaac hit the Gulf Coast early Wednesday morning. Wind speeds have slowed, but the storm moving at just 6 miles per hour is expected to dump rain up to 20 inches of rain over the next day.

New Orleans’ federal levee system, given a $14.5 billion upgrade post-Katrina, has held back the storm surges so far.  Storm surges as high as 12 feet did overtop a local levee in Plaquemines Parish, Louisiana, flooding the area and leaving dozens stranded on their roofs. More than half a million Louisiana residents are also without power. Isaac is expected to weaken as it continues inland, with rain continuing for another day.

Exactly seven years to the day since Katrina hit, Hurricane Isaac is set to make landfall in Louisiana and Mississippi Wednesday morning. Isaac didn’t rain too hard on the GOP’s convention parade in Tampa, but the slow-moving and large Category 1 hurricane can still do a plenty of damage as it heads up the Mississippi.

For starters, the area covered by Hurricane Isaac is huge. The storm’s outer edges are raining down on Florida and North Carolina, some 200 miles from the eye of the hurricane. The hardest hit areas along the Gulf will likely be dumped with over 24 hours of heavy rain. Earlier today, President Obama signed a declaration of emergency in Mississippi. Offshore oil rigs, which have reported wind speeds of 90 mph, are also being evacuated.

High winds create the biggest threat to coastal regions: storm surges. The crests of water pushed ashore by hurricane winds flood and destroy all property in their path. The National Oceanic and Atmospheric Administration (NOAA) earlier tweeted out a specific warning explaining the danger of storm surges.

In 2005, storm surges caused by Katrina overwhelmed the levee system, wrecking catastrophic damage across New Orleans. Isaac doesn’t have the Category 5 intensity of Katrina, but even a Category 1 hurricane can do plenty of damage. For example, Hurricane Claudette in 2003 battered the coast of Texas for more than 24 hours, causing $180 million in damage. Aside from storm surges, long and heavy rain from Hurricane Isaac can cause flooding on its own.

Storm trackers might want to check out Google’s Hurricane Isaac crisis map, embedded below. The full map has links to government announcements, hurricane information, and geotagged user videos.

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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