In some cases, road surfaces can wash away beneath floodwaters. “As rainfall rates intensify, water may quickly rise, especially near streams, other waterways and low-lying areas,” Porter said.įorecasters urge motorists to avoid driving through flooded areas, as water may still be on the rise and it could be deeper than it appears. “These areas are places where serious flash flooding has occurred in the past, especially in the higher ground,” Porter warned.Ĭities at risk for flash flooding mid- to late-week include San Antonio, Austin, Dallas, Fort Worth, Del Rio, Kerrville, Waco and Tyler, Texas.īeyond the Dallas/Fort Worth area, flash flooding may also occur farther to the northeast across southeastern Oklahoma and northwestern Arkansas prior to the end of this week. The most substantial flooding could threaten the Hill Country northwest of San Antonio and west of Austin, Porter said. Pamela’s expected path through Mexico and Texas. Many areas have been abnormally dry for a long stretch, and some areas are in the grips of moderate drought, according to the United States Drought Monitor. That is likely to unfold despite the fact that the region could use a good soaking rainfall. Much of the rainfall may fall in 8 hours or less with the potential for rainfall rates of 2 inches per hour or greater in some cases. Rain will pour down so quickly that flash, urban and small stream flooding is expected. Within this zone, a general 4-8 inches of rain is anticipated with an AccuWeather Local StormMax of 10 inches in central Texas. The combination of the strengthening non-tropical storm system, its associated stalled front, and moisture from Tropical Rainstorm Pamela are poised to unleash torrential rainfall from near the Big Bend area of the Rio Grande River to portions of north-central Texas late Wednesday into Thursday night. AccuWeather forecasters warn that it will still be a potentially dangerous system and unleash life-threatening flooding and carry the potential for serious property damage and travel disruptions.
By the time Pamela moves northeastward across central Texas, it will likely be a tropical rainstorm. Isolated incidents of flash flooding can precede the arrival of Pamela’s torrential rain.Īs Pamela pushes over land, the system will continue to lose wind intensity.
“A significant flash flooding risk will occur across parts of Texas in the coming days as tropical moisture from Pamela is drawn northward and interacts with an intensifying storm system over the central United States,” AccuWeather Chief Meteorologist Jonathan Porter said.ĭrenching showers and thunderstorms due to the approach of a cold front can saturate the soil and lead to runoff in some cases into Wednesday afternoon.
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