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Government Security News August Digital Edition

Climate Change – This

Climate Change – This is what it’s going to look like! A dispatch from Baton Rouge from George Lane, GSN Columnist Thu, 2016-08-18 03:00 AM My son was evacuated Saturday night by boat in Lafayette, Louisiana. The National Weather Service (NWS) said this was a one in 500 years flood; however, there have been 8 one in 500 year floods in this year alone, including one in Louisiana in March. This is what climate change will look in Louisiana. Here is why the disastrous flooding occurred; 1.) “Inland Tropical Depression”: Flooding in Louisiana was fueled by a system somewhat similar to an inland tropical depression. Parts of Louisiana saw more rain than some U.S. cities have seen in the last few years combined. Deep, tropical moisture in combination with low pressure near the earth’s surface and aloft were the main ingredients that fueled the serious flooding in Louisiana. Simultaneously the Jet stream dipped into North Louisiana, providing a blocking force that kept the tropical storm over South Louisiana. On Friday morning, NOAA’s Weather Prediction Center said: “The best description of this system is that of an inland sheared tropical 20 depression.” The rainfall it produced was very similar to what one would expect from a George Lane slow-moving tropical depression or storm since rainfall potential is related to the forward speed of those types of systems. A weather forecast discussion from the National Weather Service in New Orleans Friday morning said that the moisture content in the atmosphere was higher than what has been observed there during some tropical cyclones. It was an all-time record for the area. When that much moisture is available in the atmosphere, thunderstorms can produce excessive rainfall of several inches in a single hour, leading to astronomical totals over time. While no one likely forecast 24+ inches of rain in southeast Louisiana, this is the type of thing that can happen on a very localized scale in situations like this one. 2.) River Records Shattered by 4 to 6+ Feet: At least 8 river gauges have set new record highs in southeast

Louisiana, exceeding the previous record by several feet in some cases. The most extreme of those was in Magnolia, Louisiana, where the Amite River crested at 58.56 feet. This topped the old record at that location by more than six feet set on April 23, 1977. The Amite River in Denham Springs hit 4.7 feet above its previous record set in 1983 on Sunday morning. Records there date back to at least 1921, making this an impressive feat. These areas were already saturated with rain, and could not absorb water, allowing water to accumulate. 3.) More Rain Fell Than Los Angeles Has Seen in More Than 3 Years: Since the start of 2012, Los Angeles has seen a total of 29.18 inches of rain. In just a few days, Watson, Louisiana, picked up two inches more than that amount with 31.39 inches of rain during the event. 4.) Second 24+ Inch Rain Event in Louisiana This Year: This is the second time in a matter of months that Louisiana has seen more than 24 inches of rain from a single event. Almost 27 inches of rain fell southsoutheast of Monroe, Louisiana, on March 8-11, 2016. The official airport reporting station in Monroe picked up 20.66 inches of rain. Record flooding was observed on five river gauges in parts of the state, also topping the previous records by several feet. The potential for heavy rain and flooding will continue the next few days as the tropical moisture expands northward from the Gulf Coast and interacts with a stalled frontal boundary. Additional locally heavy rain will impact parts of the Gulf Coast, including southeast Texas and Louisiana, though amounts will not be nearly as heavy as seen the last few days. FYI. George Lane, a resident of Baton Rouge, Louisiana, has 25 years of experience in the development of chemical security systems, conducting research as a NASA Fellow at the Stennis Space Center and as a NASA Fellow. Lane was air quality SME for the University of California at Berkeley Center for Catastrophe Risk Management during the BP Oil Spill. He is currently Chemical Security SME for the Naval Post Graduate School Maritime Interdiction in the Center for Network Innovation and Experimentation. 21 Sign-up for Free GSN Digital Editions and Email Newsletters Free subscription to your selection of GSN digital editions and daily/weekly email newsletters. Add new selections or opt-out of any selections at any time. Monthly Digital Edition Airport/Seaport Newsletter Daily Insider Newsletter GSN Media Kit CLICK HERE The News Leader in Physical, IT and Homeland Security