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Ghosts of Allison

I sure hope everyone made it through yesterday’s ferocious rain all right.

The storm that flooded the greater Houston area on Monday – drenching the region with the most rain since Tropical Storm Allison dumped more than 24 inches in June 2001 – packed a mighty punch in mere hours.

Some areas saw as much as 4 inches of rain fall in an hour Monday morning. Unfortunately for some motorists, the heaviest downpours occurred between 6 and 7 a.m., just as they had started their commute to work.

Parts of Harris and Waller counties to the west of Houston were swamped with as much as 18 inches. For that section of Harris County, and much of central Waller County, the rainfall totals matched those expected during a one-in-200-year rain event, according to the National Oceanic and Atmospheric Administration. Totals were much lower for eastern Harris County, where fewer than 4 inches of rain fell in some locations.

Jeff Lindner, a meteorologist with the Harris County Flood Control District, said between Sunday night and mid-afternoon on Monday, an average of 7.75 inches of rain fell in neighborhoods across the county. That’s the equivalent of 240 billion gallons of water.

“The big problem with this storm was the volume of rain it produced in such a short amount of time,” said Don Oettinger, a meteorologist with the National Weather Service’s Houston/Galveston office.

[…]

As the heavy rainfall moved out of the Houston region on Monday afternoon the question became: what comes next? Fortunately, drier air contributed to a quiet Monday evening, in terms of rain showers.

Unfortunately, the greater Houston region is not done with the potential for heavy rainfall this week, as moisture will continue flowing in from the Gulf of Mexico to recharge the atmosphere, and the atmospheric instability that led to Sunday night’s and Monday’s downpours isn’t going away entirely. However, another gargantuan, slow-moving system that Houston just experienced seems unlikely.

The National Weather Service forecast for the Houston region calls for additional showers and thunderstorms over the next three days, with accumulations of perhaps 1 to 4 inches more rain between Monday night and early Friday.

It is possible there will be higher levels in certain areas. Meteorologists say Wednesday is the day when the region could see the most organized rain showers.

HISD schools are closed again today. Some parts of town experienced terrible flooding yesterday, and they are in danger of further damage today and tomorrow. I haven’t seen any information about what to do to help those who have been affected. If and when I do, I’ll post something about it. In the meantime, stay safe, and for God’s sake heed all warnings about high water on the roads. The Press has more.

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One Comment

  1. Bill Shirley says:

    I would love to see a rain-per-watershed comparison with last year and with Allison. They all have unique characteristics.