Beginning this morning, Houston has entered a distinctly wetter pattern that should bring 2 to 4 inches of rainfall to much of the region, with higher isolated totals. While area soils are plenty dry and able to handle such rain, the potential for briefly heavy rainfall could lead to a few flooded streets in low-lying areas at some point this week. The wet period may continue into Saturday morning.
It’s a particularly muggy morning, with highs about 5 to 15 degrees warmer than on Monday. (Weather Bell)
Tuesday
So what has changed? After high pressure moved away from the region, much richer moisture has pushed into Texas from the Gulf of Mexico. Additionally, the atmosphere is becoming more unstable as small disturbances begin to move overhead, promoting rising air. As a result of all this we’re going to see fairly widespread showers today across much of the region. With mostly cloudy skies, high temperatures should reach the mid- to upper-80s to go along with light, southeasterly winds. Rain chances become lower by around sunset, but may begin to increase again during the wee hours of Wednesday.
Wednesday
This will be another day with fairly widespread rain showers—about a 60 percent chance—and mostly cloudy skies. Look for highs in the mid-80s. The evening should again provide a bit of a reprieve from shower activity.
Thursday and Friday
At this point it looks like rain chances will peak on Thursday and Friday, with 70 or 80 percent of the area seeing rainfall each day. Highs, accordingly, will be in the mid-80s without much of a cooldown over night.
NOAA rain accumulation forecast for now through Saturday. (Weather Bell)
Saturday, Sunday, and beyond
Beginning on Saturday skies may turn a little more sunny, but we’ll still have a chance for at least some scattered showers. Sunday should be at least partly sunny as well, with highs nudging back into the upper 80s. After that time we’ll be watching to see if a cold front moving down through Texas makes it all the way through Houston and off the coast early next week . Either way, right now, the front looks to be a fairly weak one, with only moderate effects on temperatures and dewpoints. Your sweaters are safe in their closets, for now.
After five sunny and splendid days, Houston’s weather will turn warmer and muggier in the days ahead, with increasing rain chances by Tuesday running through the end of the week. Much of the area should see 1 to 3 inches of rainfall this week, which is fine as it has now been nearly two weeks since Hurricane Nicholas made landfall.
Monday
Today will be somewhat of a transition day after high pressure has departed the region. Yes, atmospheric moisture is returning, but levels should not be high enough to generate much in the way of shower activity. Area-wide, rain chances will be only about 10 percent. There should be enough afternoon sunshine to allow temperatures to approach 90 degrees for much of the region, and lows will only drop into the mid-70s.
Tuesday
Conditions turn more favorable for showers on Tuesday, with rain chances increasing to about 40 percent. Additional cloud cover should shave a degree or two off peak temperatures during the afternoon. Storms will be scattered, and should move fairly quickly from south to north.
NOAA rain accumulation forecast for now through Friday. (Weather Bell)
Wednesday and Thursday
Rain chances will peak on these days, as an energetic atmospheric feature known as a “jet streak” moves overhead and helps air at the surface to rise. As a result, both of these days should be mostly cloudy, with on and off shower activity. Highs will be in the mid- to upper 80s. Rain will be possible during the overnight hours as well.
Friday
Models suggest rain chances will start to diminish on Friday, perhaps to around 50 percent, but this should still be a mostly cloudy day, with highs slotting somewhere in the mid-80s.
Saturday, Sunday, and beyond
The forecast for next weekend remains fairly fuzzy. It now seems unlikely that a front will make it through the area, but we may fall further under the influence of high pressure by Saturday or so, and this should bring sunnier weather back to the region. For now, I’d predict partly sunny skies this weekend, with highs in the upper 80s. But the forecast is written in pencil, rather than pen. The arrival of our next front now looks to be delayed until Tuesday or Wednesday of next week.
Tropical outlook for Monday morning. (National Hurricane Center)
Tropics
The Atlantic tropics remain active, with major hurricane Sam and a couple of more areas likely to develop later this week. However, Sam will probably steer east of Bermuda and avoid any landmasses, and there is no reason to believe any of the other storms in the Atlantic will track far enough west to reach the Gulf of Mexico.
Our official morning low at IAH Airport was 57° yesterday and 58° today, the coolest pair of back to back days since late April or early May. We are now on the “other side” of things in the wake of the cold front, which means that, while it will still be quite nice the next couple days, it will begin to warm up a bit.
Today & Saturday
Both days look mainly sunny with light winds and comfortable humidity. Look for highs in the mid-80s and nighttime lows inching back into the lower or middle 60s.
Sprawling high pressure dominates the eastern half of Texas and most of the southeast third of the U.S. this morning (NOAA)
As high pressure gradually slips to our east, we will see onshore winds gradually return here, which means humidity will inch back up just a bit also by tomorrow.
Sunday
The end of the weekend will mark the true transition back to more late-summer weather. Expect continued sunshine and a morning low in the mid-60s (warmer at the coast), followed back daytime highs in the mid to upper-80s with a bit more humidity.
Monday & Tuesday
Weather models had been pretty aggressive with bringing rain back to the area next week. For Monday and Tuesday at least, that doesn’t seem too likely. Yes, there will be shower chances on both days, but the setup initially looks kind of mediocre, with probably just a few showers and generally lighter rainfall totals by the end of Tuesday. We will see clouds and plenty of humidity though. Look for highs near 90 degrees and lows in the 70s.
Wednesday & Thursday
The middle to late part of the week may see just a little more support for showers, so rainfall could be a bit more noticeable then. Highs will be contingent on cloud cover and could exceed 90 with enough sunshine, but we’ll generally call for upper-80s or a little cooler with more rain showers.
Generally about 1 to 2 inches is expected on average next week, with perhaps a lean toward the lower end of that range in the Houston area. (Pivotal Weather)
Overall, we aren’t especially excited about this setup for rain next week. Given the models maybe backing down some today, it looks like an average of 1 to 2 inches is most likely across the region. The highest amounts may be south and west of Houston. Some of you may see less than an inch too. More on this for you Monday.
Late next week
Weather models have been at least hinting at some kind of cold frontal passage later next week for a few days now. It’s too early to get too specific, but I think the evidence points to a couple things right now. First, the “front” will probably not be like this week’s front in that we aren’t going to turn significantly cooler behind it but rather a little cooler but a good bit less humid. I wouldn’t expect 50s for lows right now, but we’ll see.
When you look at the 51 members of the European ensemble late next weekend, most imply some kind of cold front passing through, but none show a particularly significant front. (Weather Bell)
Second, the timing of the front would be probably next Saturday or Sunday, so most, if not all of next week looks humid. Could all this change? Certainly. We’ll see how things go over the next few days and report back to you next week on what’s happening. So, soak up the next day or two if you like autumn weather.
Tropics
I want to just append a quick note on the tropics today because yesterday morning we had Tropical Depression 18. This morning we have Hurricane Sam. Sam has rapidly intensified into a hurricane out in the open Atlantic.
Hurricane Sam will continue intensifying into a major hurricane over the next few days, which should also help keep it north of the Caribbean islands. (NOAA)
Sam is expected to become at least a strong Category 3 storm over the next few days which will also help it probably track a little more to the north than it appeared a couple days ago. This should hopefully bypass the Caribbean islands entirely and then turn north and out to sea, though Bermuda may need to keep an eye on Sam. Otherwise, as Eric noted yesterday, at least the Gulf should remain trouble-free.
It’s a strange time a year. The historical peak of the Atlantic hurricane season came fewer than two weeks ago. Moreover, a little more than a week ago, Hurricane Nicholas struck the Texas coast and knocked out power for hundreds of thousands in the region. And today, Space City Weather is saying hurricane season is probably over for Texas? Really? Why yes. Yes we are.
There are a couple of reasons for this. Historically, the odds of a hurricane striking the state of Texas are about 1-in-50 after September 24. Our confidence is increased this year because, looking ahead at the next 10 days, the western Gulf of Mexico looks pretty quiet, especially north of the Bay of Campeche. This is the time of year when the jet streak starts a seasonal swing southward, and our region becomes more prone to cold fronts, which push any tropical systems in the Gulf of Mexico to the east. We’ve already seen one weak front about 12 days ago, a stronger one yesterday, and there’s perhaps another front coming early in October.
All of this means that we’re pretty confident that Texas is not going to get hit by another hurricane this year, even though the “Atlantic season” runs through November 30. We may very well still see tropical mischief, in the form of a depression or moisture that sparks some heavy rainfall. But the blowy, storm-surge stuff—we’re probably done with worrying about that for 2021. As always, we’ll keep an eye on the tropics. But you don’t have to if you don’t want to.
Your sunrise temperatures on Thursday morning. (Weather Bell)
Thursday
There’s not a whole lot to say about our weather other than it’s gorgeous. Lows this morning range from the 50s inland to about 70 right along the coast. Today will bring more dry air, with light easterly winds, sunny skies, and highs in the mid-80s. Lows tonight will drop into the low 60s.
Friday and Saturday
Expect more of the same. Highs in the 80s. Sunny skies. Mostly dry air.
Sunday
The second half of the weekend should see continued sunny skies, but dewpoints are going start climbing, and so while temperatures remain in the 80s it will start to feel a touch more humid. Lows Sunday night will be notably warmer, likely only dropping to around 70 in Houston.
Skies will be mostly sunny this week, before turning mostly cloudy next week. (Weather Bell)
Next week
Much of next week will be something of a return to summer-lite weather, with highs near 90 degrees, lows in the low 70s, and lots of clouds. As the influence of high pressure lessens, we’ll open back up to moisture from the Gulf of Mexico, and rain chances will increase to perhaps 50 or 60 percent each day. As a rough guess I’d say much of the metro area sees 1 to 3 inches of rain total, or thereabouts. But it’s still too early for any precision. The models are starting to hint at a front in the Friday or Saturday range of next week, but there are certainly no guarantees.
