Strong storms hit Houston overnight, more coming this morning

Very strong thunderstorms are moving through Houston this morning, and as of 5:30 a.m. as much as 1 to 6 inches of rain have already fallen. This is producing some street flooding, but so far bayous have largely remained within their banks.

Brays Bayou at South Main has seen a significant rise during the overnight hours but is holding within its banks for now. (Harris County FWS)
Brays Bayou at South Main has seen a significant rise during the overnight hours but is holding within its banks for now. (Harris County FWS)

The first round of storms has now largely moved off to the east, but another significant line of showers is coming in from the west. They will likely arrive in western Harris County by about 6:30 a.m.

These thunderstorms are capable of producing rainfall rates of 2 to 4 inches per hour, but the good news is that they are generally progressing. This means the heaviest rain should move through before noon. These storms could test some bayous before then, however.

As I have been saying, outdoor activities on Saturday morning are highly discouraged. Many streets are flooding, there have been multiple tornado warnings in the southeast part of the city, and more storms are on the way. According to Harris County sources, there is extensive damage around Danbury and Friendswood, and possible injuries at a mobile home park in Brazoria County. There have also been reports of a tornado in Pasadena. Some 25,000 Reliant customers are without power.

We still should see a clearing pattern throughout the day, with rains ending by afternoon or early evening for most areas.

Posted at 5:45 a.m. Saturday

Update on rain chances tonight and Saturday

The radar is mostly quiet across Houston this evening with heavy heavy rain remaining far to our northwest and southeast. I expect showers across the city to stay scattered to non-existent until around midnight or so.

Between midnight and Saturday morning there should be intermittent moderate- to heavy- showers across much of Houston, but for widespread heavier rain we may have to wait until after sunrise.

RAP model forecast for radar reflectivity at 8 a.m. CT on Saturday. (Weather Bell)
RAP model forecast for radar reflectivity at 8 a.m. CT on Saturday. (Weather Bell)

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Latest on the severe weather threat facing Houston tonight

You may have seen the extreme weather in central Texas this morning — some areas near Austin received 10 inches of rain in two hours — and understandably had the concern that similar conditions are coming to the Houston region later today, tonight and on Saturday.

Flooding at the University of Texas on Friday. (Collin Meyers, KEYE-TV)
Flooding at the University of Texas on Friday. (Collin Meyers, KEYE-TV)

 

The short answer is, I don’t think so, at least not so extreme conditions.

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Everything you need to know about this weekend’s forecast

The forecast for this weekend remains pretty much the same as I’ve been describing it all week. Please remember this isn’t a guarantee. Nailing the precise timing of rain events like this is an inexact science, but we can have decent confidence in this forecast.

FRIDAY

Breezy conditions, with strong southerly winds. Rains approach Houston from the west, perhaps reaching the western part of the metro sometime during the early afternoon hours, and the rest of the area during the mid- or late afternoon hours.

FRIDAY EVENING

Rains move in from west to east, starting with light rain, building to steadier storms by roughly 7 to 10 p.m. Most areas will begin to see some rain. Additionally the strong southerly winds could push tides 1 to 2 feet above normal. A coastal flood advisory is in effect.

FRIDAY NIGHT

Heavier rains move into central Houston just before or after midnight on Friday. It’s not clear whether the biggest burst will come over inland counties or closer to the coast. 1 to 2 inches are possible. Thunderstorms likely.

According to NOAA, conditions for damaging winds, hail and isolated tornadoes are highest over central Texas. (NOAA)
According to NOAA, conditions for damaging winds, hail and isolated tornadoes are highest over central Texas. (NOAA)

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