Tropical Storm Isidore making its Louisiana landfall Rainfall is confined to extreme eastern portions of the state, where rainfall peaks at 1.72 in (4.4 cm) in Sondeheimer, Louisiana. No significant flooding resulted from high tides caused by the storm. Despite making landfall on Louisiana, as a result of convection displaced east of the center, the state receives primarily minimal effects from Hanna. September 14, 2002 – Tropical Storm Hanna makes landfall near the mouth of the Mississippi River as a moderate tropical storm with winds of 50 mph (80 km/h), before subsequently making landfall on the border between Alabama and Mississippi.Prior to making landfall, a tropical storm warning is issued for western parts of Louisiana east to Intracoastal City. Tropical Storm Fay's outer rainbands drop light rainfall over eastern and southern portions of the state, peaking at 4.64 in (11.8 cm) in Grand Isle. West of Cameron, Fay causes a storm surge as high as 2.5 ft (0.76 m), resulting in minor beach erosion and coastal highway flooding. September 5, 2002 – Tropical Storm Fay develops offshore the Louisiana coast before making landfall in Texas as a moderate tropical storm.Tammany Parish, surface runoff from flash flooding causes some rivers to exceed flood stage. Streets were flooded by the heavy rainfall in Slidell. The storm drops scattered rainfall across the state, peaking southwest of Franklinton at 10.25 in (26.0 cm). August 5, 2002 – Tropical Storm Bertha makes landfall on Boothville as a minimal tropical storm with wind speeds of 40 mph (64 km/h) and a minimum pressure of 1,008 mbar (29.8 inHg), moving across Louisiana as a weakening system before moving back into the Gulf of Mexico on August 7.Prior to making landfall, tropical storm watches and warnings are issued along the Gulf Coast, west to New Orleans. August 6, 2001 – Tropical Storm Barry causes tides of 2–3 ft (0.61–0.91 m) along the southeastern coast of Louisiana before it makes landfall on Santa Rosa Beach, Florida on August 6.Damages from Tropical Storm Allison in Louisiana alone total to $65 million. In Zachary, a man is killed after a tornado knocks a tree onto his truck. Homes are destroyed and swept away by flooding across the state. Major river flooding occurs in Amite River and Comite River, which experience their highest water levels since 1983. Rainfall from Allison peaks at 29.92 in (76.0 cm) in Thibodaux, ranking as the second–wettest tropical cyclone in state history, only behind a hurricane in 1940. This results in catastrophic flooding across the state. Early–June 2001 – Tropical Storm Allison makes landfall near Freeport, Texas on June 5, consequently stalling over the state before moving offshore and subsequently making a second landfall on Morgan City as a subtropical depression on June 11 with winds of 30 mph (48 km/h) and a minimum pressure of 1,004 mbar (29.6 inHg).
In Terrebonne Parish, strong thunderstorm winds associated with the depression damage trailers and boats in Bayou Black, resulting in $2,500 in damages. At the coast, Tropical Depression Nine brings a storm surge peaking at 3 ft (0.91 m). Although the depression makes landfall on Texas, most of the rain associated with the system affects Louisiana, where rainfall peaks at 6.70 in (17.0 cm). September 9, 2000 – Tropical Depression Nine makes landfall near the Texas and Louisiana border as a tropical depression with winds of 30 mph (48 km/h).In terms of wind speed, Hurricane Ida, Hurricane Laura, and the 1856 Last Island hurricane are the strongest storms to affect the state, each producing maximum sustained winds of 150 mph (240 km/h), equivalent to Category 4 on the Saffir–Simpson hurricane scale.įlooding from Tropical Storm Allison in Chackbay The 2020 hurricane season has seen the most landfalling tropical cyclones in a single season with 5 total storms. Katrina is also tied with Hurricane Harvey of 2017 as the costliest hurricane in the Atlantic basin. The most intense storm to affect the state in terms of barometric pressure is Hurricane Katrina of 2005, which also caused the most fatalities and damage with 1,833 total deaths and over $100 billion in total damages. The most active month for tropical cyclone activity in the state is September, with ten total storms, while no recorded storms have affected Louisiana during the months of December through May.
According to David Roth of the Hydrometeorological Prediction Center (HPC), a tropical cyclone makes landfall along the coastline about two times every three years, and a hurricane makes landfall once every 2.8 years.
Flooding in Downtown New Orleans caused by Hurricane Katrinaįrom 2000 to the present, at least 28 tropical or subtropical cyclones affected the U.S.
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