All of this rainfall caused catastrophic drainage issues and made rivers rise greatly. As the center of Harvey slowly moved east-southeast and back offshore heavy rainfall continued to spread through much of the 29th and the 30th exacerbating the ongoing widespread and devastating flooding. The morning of the 27th saw additional rain bands continued to develop and produced additional excessive rainfall amounts. as tremendous rainfall rates occurred across much of Harris County. This resulted in a rapid development of flash flooding between 10:00 p.m. A strong rainband developed over Fort Bend and Brazoria Counties during the evening hours of the 26th and spread into Harris County and slowed while training from south to north. Rain bands on the eastern side of the circulation of Harvey moved into southeast Texas on the morning of the 25th and continued through much of the night and into the 26th. As Harvey moved inland, it’s forward motion slowed to near 5mph after landfall and then meandered just north of Victoria, TX by the 26th. on August 25th as a cat 4 and brought devastating impacts. Harvey made landfall along the Texas coast near Port Aransas around 10:00 p.m. Over the next 48 hours Harvey would undergo a period of rapid intensification from a tropical depression to a category 4 hurricane. On the morning of the 23rd, Harvey was upgraded again to tropical depression as the Bay of Campeche and the Western Gulf of Mexico had very warm waters. Harvey was then downgraded to a tropical wave which entered the Gulf of Mexico on the 22nd. Hurricane Harvey started as a tropical wave off the African coast on Sunday, August 13th and tracked westward across the Atlantic and on August 17th become a tropical storm which moved into the Caribbean Sea where Harvey become disorganized. This risk is reserved for when high confidence exists in widespread coverage of severe weather with embedded instances of extreme severe (i.e., violent tornadoes or very damaging convective wind events).Hurricane Harvey is the first hurricane to hit the Texas coast since 2008 when Hurricane Ike came through the Houston areaĪnd the first major (category 3 or better) hurricane to hit Texas since Bret in 1999. High (Magenta): An area where a severe weather outbreak is expected from either numerous intense and long-tracked tornadoes or a long-lived derecho-producing thunderstorm complex that produces hurricane-force wind gusts and widespread damage.Moderate (Red): Jumping to a moderate risk level means more widespread severe storms are likely, and they could be long-lived and intense.This level is marked by more persistent and widespread storms, a few of which could be intense. Enhanced (Orange): Under enhanced conditions, numerous severe storms are possible.While they might not be as persistent, these storms could still produce isolated intense conditions. Slight (Yellow): A slight risk means scattered severe storms are possible, though they'd likely be short-lived and not have widespread coverage over an area.Storms would likely be limited in how long they last, how much area they cover and how intense they become. Marginal (Dark green): This initial level means isolated severe thunderstorms are possible.
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