Eric Berger

Houston has yet to have a 100-degree day this year. Some summers we get lucky, such as in 2014, when the mercury never got that high. Sometimes we get more. For example, during the ridiculously hot summer of 2011 every day but one during the month of August had a high of 100 degrees or higher. The average high temperature that month was a staggering 102 degrees.

This summer won’t be nearly so hot, far from it, but the Houston region has a slight chance to hit 100 degrees today and Friday at its official weather station, Bush Intercontinental Airport, today and Friday before things cool off a bit.

Thursday and Friday

Houston will lie on the edge of high pressure to end the work week, and this will allow for mostly sunny, and hot days. While I won’t rule out a few stray showers, for the most part we’ll be dry, with highs reaching the upper 90s—and possibly 100—for inland areas, and lower to mid-90s closer to the coast.

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Houston’s weather will remain hot for a few more days as the region flirts with high pressure, but as we head into August it doesn’t look as though the region will immediately fall under a classic “ridge of death” that stifles rain chances. Quite the contrary, later next week could be fairly wet and a bit cooler.

Today

Moisture levels have jumped back up today, and we’re likely to see at least some scattered showers this afternoon across the area. I think it’s even possible that most areas will see some light to moderate rainfall, but I wouldn’t bet on that. In any case, more clouds should hold temperatures in the low- to mid-90s.

Thursday and Friday

High pressure builds in somewhat, and this should limit shower activity and bring out the sunshine. I’d expect highs to jump up accordingly, into the mid- to upper-90s. Either of these days could bring temperatures of 100 degrees for inland areas, so be prepared for the heat.

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One of the cruelest aspects of summertime in Houston is that it lasts so late into “fall.” When considering the average high temperature, the peak of summer for most of the United States comes in July—on average July 23rd for the lower 48 states. This is understandable, as the Sun reaches the highest point of the sky in late June. However this is not the case for much of Texas, and especially the Texas coast, where the peak of summer typically comes during the second week of August (see map below).

The primary driver of this latent heat, of course, is the Gulf of Mexico, which takes a little longer to warm up in late spring and early summer, and therefore takes a lot longer to cool down in August and September due to slightly shorter days and, eventually, cool fronts from the north. As a result Houston “enjoys” peak heating well into the month of August while the rest of the country begins to cool down.

This is a good day to discuss peak heating because some areas of Houston this week will have an outside shot at hitting 100 degrees for the first time this year.

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Aside from the local excitement over Tropical Storm Cindy, the 2017 Atlantic Hurricane Season has been a quiet one for Texas. That’s not surprising, as about 90 percent of all tropical activity during a given season occurs after this point during hurricane season. Basically, then, June and July are often just a prelude for the heart of hurricane season—August and September. And as we get close to August this year, a key signal suggests busier days may lie just ahead.

One measure of this activity in the atmosphere is “potential velocity,” which is rather complicated to compute, but essentially this is a useful indicator of rising air and a better chance for tropical systems to form. In the graphic below, we can see the potential velocity (VP) anomaly for this week (top), and the first week of August (bottom). Note the dramatic shift from a positive anomaly (which is bad for hurricanes) to a negative one over the tropical Atlantic, between Africa and the United States.

This does not guarantee the development of a hurricane by any means. But it does suggest that as we approach the traditional peak of hurricane season, meteorological factors may also be improving for storm formation. In any case, it is the time to make your final preparations for hurricane season. Now, onto the forecast.

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