Sunday update on this weekend’s heavy rain and the tropical threat

In regard to rainfall and the Houston metro area, we have two separate issues to discuss. There is the potential for heavy rainfall on Sunday, Monday, and Tuesday; and then the renewed potential for heavy rain toward next weekend, as a tropical disturbance—perhaps Tropical Storm Gordon—brings rainfall to the northern Gulf of Mexico coast.

A satellite image from Sunday morning showing both systems. (NOAA/Space City Weather)

Labor Day Weekend

A weak low pressure system over southern Louisiana and the northern Gulf of Mexico will drift westward over the next few days, bringing an excellent chance of rain to the Houston metro area on Sunday, Monday, and Tuesday. The National Weather Service will issue a “Flash Flood Watch,” and there is a general expectation of 1 to 4 inches of rainfall, with isolated areas seeing as much as 8 inches. The best chance for heavy rainfall will come on Sunday night, and throughout Labor Day. If you have travel plans on Monday, please to check conditions before venturing out. For the most part we expect street flooding, but can’t rule out some more serious effects in areas where the storms establish themselves and don’t really move.

Synopsis of Labor Day weekend rain. (National Weather Service)

We have reasonable confidence that after this system clears the area, we should see somewhat drier conditions on Wednesday and Thursday for Houston, with partly sunny skies and more scattered showers. Which is a good thing, because …

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Some kind of tropical system likely in the Gulf next week

Houston continues to face the prospect of a wet Labor Day Weekend—but we’re not concerned about anything more than the potential for some street flooding and spoiled outdoor barbecues with intermittent showers and thunderstorms.

However, we did want to update you on the potential for tropical mischief in the Gulf of Mexico next week. Some forecast models have become a little more bullish on low pressure forming in the northern Gulf next week, which could lead to development of a tropical storm. As of Saturday morning, the National Hurricane Center predicts a 40 percent chance that a tropical depression or storm will form during the next five days.

Tropical Weather Outlook. (National Hurricane Center)

There are a lot of uncertainties with this system, and forecast models are having a difficult time resolving them. Of course, everyone will want to know where this will go. However, that’s simply impossible to say without a reasonably well defined low pressure system, and that probably won’t exist for a couple of days.

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