Barry D. Keim Louisiana State Climatologist Louisiana State University Hurricane History of the Gulf and East Coast of the U.S.

Figure 1: Surface and 500-mb maps at 0700 EST (1200 UTC) for 1-3 May 2010 from the Daily Weather Map series provided by National Oceanographic and Atmospheric Administration ’ s (NOAA) Hydrometeorological Prediction Center. Nashville Storm and Flooding May 1-2, Inches in 60 Hours Estimated as > 1000 year event Within 90% of PMP Estimates

Spatial Pattern of Temperature Trends Decreasing Trend in Days with Max T > 95 F Increasing Trend in Min T > 75 F Reduction in the Diurnal Temperature Range

Precipitation Indices Across the Southeastern U.S. Rainfall Intensity is Increasing Defined as Total Annual Precip Divided by # of Rain Days

Dry Spells Across the South Central United States

State No. of Counties Florida23175,000841,0004,916,000 Alabama276,000272,000540,000 Mississippi350,000127,000364,000 Louisiana11474,000930,0001,611,000 Texas14178, ,0005,006,000 Total53953,0003,751,00012,437,000 Population of U.S. coastal Counties/Parishes Gulf of Mexico in 1900, 1950, and 2000.

CSU: Bill Gray and Phillip Klotzbach In 2014, so far: 8 Named Storms 6 Hurricanes 2 Major Hurricanes

Time-Space Continuum of Hurricanes in U.S and Mexico

What’s driving the increased storm counts? Atlantic Multidecadal Oscillation Index

Hurricane Observing Platforms Over Time

Open Atlantic Ocean Differences 1933 Hurricane Season 2005 Hurricane Season Source: Landsea (2007) The 2 most active seasons on record

Galveston 1900 Hurricane Ike 2008

Sunset at Cameron, LA