![]() In other words, it does not matter if the tropical cyclone is a tropical depression (with wind speeds up to 38 mph), a tropical storm (winds of 39 to 73 mph), or a hurricane (winds from 74 mph or greater). The devastating flooding from Allison is a stark reminder that rainfall from tropical cyclones does not depend upon the strength of the system. Why did Allison generate so much rainfall? Flooding would accompany Allison over the next four days as the remnants of the storm meandered north to Lufkin, southwest to between Huntsville and College Station, and then south to off the coast near Freeport. The storm moved inland later that afternoon, quickly weakened, and became a tropical depression that evening as it drifted inland over Houston. By the morning of Tuesday June 5th, Tropical Storm Allison formed about 140 miles south of Galveston (see figure below for a track of Allison). A disorganized area of thunderstorms then formed over the Gulf of Mexico as moisture associated with the remnants of the tropical wave interacted with an upper low located over South Texas on June 3rd and 4th. Very little rainfall was associated with this system as it progressed westward and it eventually reached the Gulf of Tehuantepec off the western coast of Mexico on June 1st. ![]() The Tropical Prediction Center began to track the wave on May 21st after it moved off the west coast of Africa. The formation of Tropical Storm Allison can be traced back to a tropical wave. To sum things up, we will look at actions you can take to avoid the dangers and minimize the impacts of a devastating flood event. ![]() This article is a look back at Allison’s formation, why the storm dumped so much rainfall, and some details on the rainfall and devastating flooding in Texas. After Allison made landfall, more uninvited events unfolded – four days of heavy rainfall episodes that culminated in devastating flooding across the Houston area. A tropical storm had formed and was close to moving onshore along the upper Texas coast. rainfall record of 52 inches, set by Hurricane Hiki in Hawaii in 1950.ġ8: The number of places in southeastern Texas that broke the previous tropical rainfall record in the contiguous United States, which was set during 1978's Tropical Storm Amelia in Medina, Texas.Residents of southeastern Texas woke up to an unwelcome surprise on June 5, 2001. Rainfall within a tenth of an inch of that total was recorded in Groves, a neighboring community. Over 300,000: Number of structures flooded in southeastern Texas, where extreme rainfall hit many areas that are densely populated.Ībout 336,000: Number of customers who lost power during the storm.Īpproximately 40,000: Number of people who stayed in shelters in Texas and Louisiana.Ħ0.58 inches: The highest storm total rainfall, found in Nederland, northeast of Houston. While the figure is not final, it is second only to Hurricane Katrina when adjusted for inflation and other cost increases. ![]() $125 billion: The latest damages estimate from the storm, according to the National Oceanic and Atmospheric Administration. Here are some of the key figures that tell the story of the historic storm: Shots - Health News Slow And Upbeat EPA Response To Hurricane Harvey Pollution Angers Residents ![]()
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