Good morning. Today is likely to be the final, exceptionally hot day of 2023. I expect temperatures to reach 100 to 107 degrees across the metro area today underneath sunny skies. We also have a pretty good chance of peaking at 100 degrees on Saturday before temperatures dip just a bit by Sunday. That’s interesting from a historical perspective in terms of 100-degree days. To date, we have recorded 44 such days this calendar year.

Back in 2011, which anyone who lived here probably hasn’t forgotten, the city recorded 46 days with highs of at least 100 degrees. That broke a record previously set during 1980, 32 days. So with today a certainty to hit 100, and Saturday quite possibly, that would allow us to tie the record set in 2011. Will we break it? Certainly we will have some days in the mid- to upper 90s in the week ahead. But I’m not sure we get another 100-degree day. And to be honest, I’m OK with not breaking the record. Aren’t you?

Friday

Today is going to be excessively hot, no way to get around that. We’re going to see much of the area push into the 105-degree range and it’s going to be miserable. The only good thing I can tell you is that this really is our last fling with ridiculously hot weather in 2023. We really are going to see a pattern change to cool things off (a bit) next week, and then we’re into late September and this madness will be over. But no getting around that today is going to be brutally hot and you definitely need to take heat precautions.

One thing we’re watching for is the possibility of late-afternoon and evening storms dropping down into the Houston region from the northeast today. It’s possible as the capping inversion probably will be weak later today. In runs produced last night, some of the high-resolution models got really aggressive in developing these storms, but they have since backed off. NOAA’s Storm Prediction Center has the northeastern part of the metro area under a “slight” chance for seeing severe weather, likely in the form of thunderstorms and damaging winds, later today. My sense is that any strong storms fizzle before reaching Houston, but there is a chance.

Saturday

Highs on Saturday will range from the upper 90s to 100 degrees, with perhaps a 40 to 50 percent chance of rain. Temperatures will depend on rainfall amounts and timing. For the most part these showers will bring only light accumulations of rain, but a few areas may get higher totals under stronger storms. For the most part, when it’s not raining, skies will be mostly sunny.

Sunday

Look for mostly sunny skies with highs in the mid-90s as the high pressure ridge recedes westward. Rain chances will be on the order of 30 percent, with mostly sunny skies.

Next week

Temperatures will continue to trend downward next week, as a weak front drifts into the region and slightly lowers our humidity levels. Basically, we’ll probably see highs in the low- to mid-90s for much of the week, with perhaps a 30 percent chance of rain each day. Who knows, a few areas may even see a high in the upper 80s on a day or two. Nighttime temperatures will drop into the 70s. It’s not going to feel fall-like like, but it certainly will feel a lot more like late summer, which is how it is supposed to feel in mid-September.

Unfortunately, while most of us will see rainfall, I don’t see the kind of drenching rains we need to break the region’s worsening drought. Still, 0.5 to 1 inch over the next week is much better than nothing, and far more than many of us received in July and August.

Steel thyselves, my friends, for one more go with extreme heat. As high pressure gets stacked up over the region, we’re going to have one more fling with temperatures substantially above 100 degrees over the next two days before we (slowly) start to moderate into somewhat more civilized weather. Next week should start to look more like a typical late summer pattern, with highs in the low- to mid-90s and much improved rain chances. Nighttime lows should also start to feel a bit cooler as well.

Thursday

Highs today will range from about 100 to 105 degrees across much of the region, with only a very slight southerly wind. Skies will be sunny, and a heat advisory is in place for this afternoon and evening. There is perhaps a 10 to 20 percent chance of rain for inland areas later today, but I would have very low expectations for that to occur.

Friday

Our heat will peak on Friday, and this will be a scorcher. Much of the area will likely reach high temperatures of around 105 degrees, with ample sunshine. There are two things to watch for. Along with the heat we’re going to see healthy wildfire chances. And secondly, there is an upper-level disturbance that will be most prominent in North Texas, but could affect our weather as well.

By late Friday evening it is possible that this disturbance drives some sort of line of storms down into the Houston metro area, likely reaching the city just before or after midnight. Not all of our modeling is showing this to happen, but given the potential for instability in the atmosphere I think it’s possible. In any case, it’s something we should have a better handle on in tomorrow morning’s forecast update.

Saturday and Sunday

The weekend forecast is still going to be hot, don’t get me wrong. Highs on Saturday will likely be in the upper 90s to 100 degrees with mostly sunny skies. But we’re going to see a pretty decent chance of showers, whether it comes early in the morning with the aforementioned disturbance, or later in the day. Then I would expect highs on Sunday to peak in the mid-90s, with mostly sunny skies and another healthy chance (maybe 40 or 50 percent) chance of rainfall.

Next week

The forecast is still uncertain for next week, but I think it’s likely that the combination of a weak front and high pressure moving out west that we’re going to see highs mostly in the low 90s by the middle to end of next week. Nighttime lows should also finally start dropping into the 70s, with some slightly less humid air. Add in some pretty decent daily rain chances, and you’ve got yourself the region’s most moderate week of weather since summer began in Houston, I don’t know, what seems like 15 years ago.

With that said, these next two days are going to be brutally hot, so be sure and take care of yourselves, your family, and your neighbors.

Good morning. High pressure is starting to build back over the Houston region today, and that will lead to four days when temperatures will likely reach 100 degrees, or higher, for most of the region. Friday looks especially hot, with highs near 105 degrees possible for inland areas. But by this weekend high pressure starts to weaken. Accordingly, next week, our temperatures are going down into the mid-90s, at least, and we’ll start to see some better rain chances.

Wednesday

Today will be sunny and hot. Before the high pressure system fully asserts control, we’re going to have a puncher’s chance of rainfall today. I’d say there will be about a 20 percent chance of a brief shower. Otherwise, high temperatures will reach about 100 degrees with mostly sunny skies. Winds will be light, coming from the southeast later today.

Thursday and Friday

Both of these days are likely to bring highs in the low 100s for much of the metro area, with sunny skies. Winds will be light, out of the west to southwest. If I squint, I can see some scenarios in which there are a few isolated showers on Thursday, but it’s not something I’m holding my breath for.

Saturday and Sunday

As mentioned above, Saturday is likely to be the final day, of four, that could see highs of 100 degrees. Conditions will be mostly sunny and hot. However, by then the high pressure system will be easing westward, opening the door to some chances for scattered showers. Sunday should be a bit cooler, with highs in the mid- to upper 90s, and more scattered showers. Call it a 30 percent chance for each day, subject to modification.

Next week

High temperatures next week should be in the range of the low- to mid-90s. We may also see cooler nights, in the 70s. There’s even the chance of a weak front and some slightly drier air. We should also see daily rain chances in the vicinity of 20 to 40 percent. So all in all, quite a bit of moderation from the summer of hell conditions we experienced for most of June, July, and August.

Tropics

As we discussed at length on Tuesday, the Gulf of Mexico remains largely closed off to tropical activity for now, and likely the next two weeks. However there is a potentially very strong hurricane developing the central Atlantic Ocean, Lee, which is likely to eventually threaten Bermuda and possibly interests along the U.S. East Coast. Matt has all of the details on The Eyewall if you want to read more.

This is a fairly long post that we’ve broken into two parts. First up in a look at what to expect for Texas, for the rest of September, when it comes to hurricane season. The TL;DR there is that things look pretty good, but we’ve still got a few weeks to go. The second part of this post was written by Matt Lanza over at our Atlantic hurricanes site, The Eyewall. It offers a broader look at activity so far in the Atlantic basin, and what that may mean for the rest of the season.

Part I: This is absolutely the heart of hurricane season in Texas

Historically, the majority of significant hurricane strikes on Texas have come in September. Most notoriously, there was the 1900 Galveston hurricane, which made landfall on September 8. More recently there was Hurricane Ike, which made landfall on September 13, 2008. This is the time of year when we see tropical waves forming off the coast of Africa, tracking across the Atlantic Ocean, and moving into the Gulf of Mexico. I never schedule vacations in late August and September for the very reason that this is “go” time for big storms.

But as quickly as hurricane season peaks, for Texas it ramps down pretty fast. As I have famously—or infamously, in some quarters—written, the odds of a hurricane strike on the state of Texas really drop precipitously after around September 24. It is too early to say whether that will be the case for this year, but the reality is that we probably have about three or four more weeks of prime time hurricane season in Texas. After that, we should be able to breathe a bit easier.

So what’s on the menu for September 2023?

As per usual, we are seeing large and powerful storms developing in the Atlantic Ocean this year. The good news is that, with the exception of Hurricane Idalia, they have steered away from the Gulf of Mexico. We’ve been heavy on fish storms this year, which is just fine. That’s also likely to be the case with the forthcoming Tropical Storm Lee, which should become a powerful hurricane this week. Read below for more details, but the bottom line is that we expect this one to recurve before nearing the Gulf of Mexico.

Looking out to mid-September, we don’t see any significant threats to the Gulf, or Texas. Not only are there few indications of storms forming or moving into the Gulf, but wind shear levels look high for the next 10 days or even two weeks. This should preclude any significant activity. However, that leaves open a window of opportunity for the last 10 days of September, during which it will be possible for storm activity. The bottom line is that we’re pretty close to the end of the 2023 Texas hurricane season, but we’re not there yet. Given the very warm seas out there, if wind shear drops down, the end of September could be rocking in the Gulf of Mexico.

So we’ll continue watching things for you, and probably post again later next week when we have a bit more insight into the end of the month.

Part II: Taking stock of the 2023 Atlantic season so far

Back in June when we launched The Eyewall, one of the things we did was dive into the components of the seasonal forecast. We explained that the 2023 hurricane season would be trickier than normal, as the developing El Niño, which typically reduces storm activity would be battling an outrageously warm Atlantic Ocean, a feature that would be good for busy storm activity. So far, that battle seems to be exactly what’s playing out. The “consensus” forecast was 16 named storms, 7 hurricanes, and 3 majors. As of Monday, we sat at 12 named storms, 3 hurricanes, and 2 majors.

Our accumulated cyclone energy for the season, or ACE, sits around 125 percent of normal for the first week of September.

If the season ended right now, we would be sitting in the upper tier of “below normal” seasons. In other words, we already have one heck of a base and seem to be on our way to an average season. Idalia, Don, and Franklin, the season’s three hurricanes, account for nearly 75 percent of the seasonal ACE to date. So three legitimate storms make up the majority of the total.

Back in June we said that we believed the Caribbean would struggle (it mostly has), the eastern Atlantic would be busy (it’s been more the central Atlantic, so that point is a little fuzzier), and that the most concerning items this season would be systems forming close to home (Idalia counts for that). So thus far, this is going mostly as expected, if not a little bit busier. Kudos to the seasonal forecasters for not just going all-in on El Niño.

Where are we going?

Well, this week we are likely to see another big jump in seasonal ACE when Lee forms.

From our morning post, you can read how we expect that to become a major hurricane, likely at least a category 4 storm. This will be a big ACE adder, and I suspect we’ll see things shoot up at least into the 70s once Lee is done, pushing us into the “average” tier of seasons if it ended right there. Behind Lee, we may get another storm in the eastern Atlantic, so there’s an opportunity for a few more ACE units.

But here’s something. If you look at the European ensemble model forecast for wind shear in days 11 to 15, which pushes us out to near September 20th now, you can see that the Gulf and western Atlantic are ripping with shear.

If that happens as forecast, anything in the Gulf will struggle, as would anything coming out of the Caribbean. However, the lower wind shear in the eastern Atlantic and central Atlantic suggests these would be the areas where storms could continue to form, continuing the legacy of the 2023 season to date. We may see less hostile conditions return to the Gulf and western Atlantic in the final days of September, but that’s obviously a long way off.

What does El Niño tell us?

Quite frankly, if we assume that El Niño is up and humming now and the influence is strengthening, then we should expect to see a lot of what we’ve already seen for the remainder of hurricane season. Here is a map of all hurricanes in Septembers and Octobers since 1950 when the Oceanic Niño Index (ONI) was 1.0 or greater for June-July-August (this year’s value is 1.1).

With a couple notable exceptions, this map shows a lot of fish storms and middling systems in the western Atlantic. The two most notable exceptions were Joaquin in 2015 which killed 34 people (33 of whom were aboard the El Faro). And also Betsy in 1965, which killed 81 and inundated New Orleans. Emily in 1987 hit Hispaniola and Bermuda. And I think that sums up the season so far: A lot of middling storms and mostly fish storms with one potent hit in Idalia.

All in all, given what we see on the maps right now and given how this season has gone, there are two primary areas that probably should watch for land impacts: Bermuda and the Greater Antilles. If we can relax shear enough late in the season and get a disturbance in the Caribbean that comes straight north, you never know what you can get out of that, and those often threaten Cuba, Jamaica, Hispaniola or the Bahamas. Bermuda remains in the target line I think for at least one or two more storms. Lastly, the eastern Gulf or off the Southeast coast may be secondary areas to watch, given the warm waters and potential for just the right things coming together at the wrong time, sort of like what we saw with Idalia and to a far less impactful extent, Harold in Texas earlier this season.

Will it be enough to drive ACE above normal for the season in the end? I’m not certain, but it will be close.