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A rare level 4 risk of excessive rainfall has been posted for the southern Hill Country and Rio Grande Plains on Wednesday. Isolated rainfall totals of up to 20 inches or more are possible.<\/p>\n
NWS Austin\/San Antonio<\/p>\n
A major flood event may unfold across South Texas Wednesday as a\u00a0surge of tropical moisture<\/a> interacts with a strengthening low-level jet stream. Torrential downpours will be possible for many, with isolated rainfall totals of 10 to 20 inches possible in a few locations.<\/p>\n A level 4, or \u201chigh,\u201d risk of excessive rainfall has been issued by the National Weather Service\u2019s Weather Prediction Center for areas west of San Antonio, including cities such as Hondo, Uvalde, Bandera\u00a0and Del Rio. A high risk is extremely rare<\/a>, occurring only once every few years across South-Central Texas.<\/p>\n Article continues below this ad<\/p>\n \u201cConsiderable to locally catastrophic flash flooding impacts are likely for portions of the U.S. 90 corridor west of San Antonio, including the southern Edwards Plateau and Rio Grande,\u201d the National Weather Service said<\/a> in a statement on Tuesday.<\/p>\n A significant flash flood threat also extends into the San Antonio metro area, the Hill Country and much of the Interstate 35 corridor. Here\u2019s what to expect.<\/p>\n Major flood threat<\/p>\n Widespread thunderstorm activity is expected throughout South-Central Texas early Wednesday, with overall rain chances rising to around 90% in San Antonio between 6 a.m. and noon. Many of these storms will be strong, producing frequent lightning, damaging wind gusts and prolonged, torrential downpours.<\/p>\n Article continues below this ad<\/p>\n Shown is the potential radar for 9 a.m. Wednesday, as widespread morning thunderstorms are expected to slowly move over South Texas.<\/p>\n Pivotal Weather<\/p>\n<\/p>\n
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