Month: July 2018

We’ll dive into the forecast for the Fourth of July in a moment. Houston has been plagued by July and August-like heat often since May. Now that we’re in July, the good news is that, at least for a short time, we will reverse course a bit. It will still be hot, but it will actually feel more like May or June than July.

Today

Off the bat, I think today will be mostly trouble-free. Again, if your plans take you east of Houston toward Louisiana, you’ll likely run into showers and storms a good bit of the way beyond Beaumont. Here in Houston, it will be partly to mostly sunny through early afternoon, though clouds should increase later in the day. High temperatures will surge back to the mid-90s once more. I wouldn’t rule out scattered showers or storms later this afternoon or evening for places primarily east of I-45.

Tonight

Our upper disturbance will approach the area later tonight. Ongoing showers and storms in Louisiana may try to hold together as they move into Texas late. Our weather models are somewhat divided on solutions overnight tonight. Possibilities across the Houston area range from “mostly nothing” to “you’re probably going to be roused from slumber at 5 AM because of thunder.” Weather models generally handle these scenarios with mixed results, so there’s a healthy degree of uncertainty here. The radar isn’t exactly lit up in Louisiana this morning, so perhaps this suggests we will need the sun to come up before we get much activity.

But when I look at the “big picture,” meteorologically, I see a strong disturbance approaching overnight. To me, this argues that showers and storms will become more and more likely as the night goes on.

I would not at all be shocked to see the “roused from slumber” solution win out for some of us. If storms do keep going overnight, it’s not a lock that the entire area would be impacted by them.

So I’ll go with this bottom line tonight: Scattered showers and storms become increasingly likely as the night goes on, with highest odds east of I-45. Expect low temperatures to bottom out in the mid- to upper-70s where it doesn’t rain, and mid-70s where it does.

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I hope everyone got through the weekend of Saharan dust without too much trouble. We saw a bit of improvement to air quality on Sunday, and we will see further improvement today and tomorrow. It may be unnoticeable by Tuesday. Then we’ll talk rain.

Today & Tuesday

Other than the lingering dust, today will just be another hot one. Look for highs to top off in the mid-90s in Houston, a bit cooler near the coast and hotter inland. It will be mainly sunny. Tuesday will start off similarly. Expect a few more clouds to roll in during the afternoon however. There may be a shower or storm around east of I-45 later in the day. But for the most part, I think Tuesday during the daytime looks good. Any organized storms on Tuesday will be in Louisiana or near Beaumont/Port Arthur. If you’re traveling I-10 east toward Lafayette or Baton Rouge Tuesday afternoon or evening, leave yourself a little extra time.

Fourth of July

Here’s where things get slightly more complicated. We’ve been discussing this since last week, and we have slightly more confidence in how things should go today. A vigorous upper level disturbance will swing across the Gulf Coast Tuesday and into Texas from east to west Wednesday and deliver showers and thunderstorms. Let’s roll through what we expect.

Timing: The start time in the Houston area will vary, but I expect an increasing chance of thunderstorms or showers from east to west on Tuesday night, sometime around and after Midnight, lingering into early afternoon on Wednesday. I think our odds of improving weather go up after 12-4 PM on Wednesday (again from east to west).

Do I need to cancel my plans? If you have July 4th evening plans, I would keep them, as the timing may work out well for fireworks and evening events. The morning and early afternoon will be dicier, so for some area parades, that could dampen things. If you have morning or early afternoon outdoor plans, you may want to have an indoor backup ready to be safe.

How much rain will fall? I believe we should see, on average, one to two inches of rainfall on Tuesday night and Wednesday. There could be a few places that see up to three or four inches of rain, or even a little more.

Flooding? Major, widespread flooding is unlikely from an event like this. As is often the case in Houston in summer, however, street flooding could be an issue in the morning or afternoon, depending on where the heaviest rains occur. Right now I think the most likely window for heavier rain from this system will be from 6 AM through 2 PM Wednesday. That may shift a bit between now and then, however.

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