Matt Lanza

In brief: After yesterday’s smattering of decent rain in spots, Houston will continue to see at least spotty to scattered showers and storms the next several days. A cool front is expected to disrupt the warm and humid weather early next week, with some uncertainty on just how far through the area it gets. Also, don’t forget to turn back the clocks tomorrow night!

Houston saw a wide range of rainfall yesterday, with a couple of areas clearly cashing in, while others struggled. The big winners were in Richmond, Rosenberg, and just west of Sugar Land, where close to 4 inches fell. Galveston and Brazoria Counties did well also with a general 1 to 3 inches in most spots. Beaumont did well to our east, as did Brookshire to our west. All in all, I’d venture to guess that about 60 percent of you are pleased with what has fallen so far, while the other 40 percent are smarting a little.

The good news is that we are not quite done with the rain yet, but the bad news is that it will be very spotty over the next few days.

Today through Sunday

Look for sun, clouds, and a smattering of showers each day. Exactly where and when these occur is impossible to predict, but the environment is supportive of at least a 30 to 40 percent rain chance each day. No need to alter plans, but have a spot in mind to scoot to if it rains for a brief time. Highs will be generally in the low to mid-80s with lows in the 70s and muggy conditions.

Oh, and don’t forget to set the clocks back an hour tomorrow night. I used to joke that I would have to adjust my temperature forecasts because of “one hour less daylight.” Meteorologist humor.

Anyway, have the umbrella handy but hopefully the rain won’t bother you too much.

Monday and beyond

Next week will be a bit of a tricky forecast. Monday should start off much like the weekend with high humidity, warm, and humid conditions. We’ll continue a chance of a shower or storm. On Monday night, a cold front will approach Houston. It should push through the area, but there are hints in model guidance that the front will probably stall near the coast or just offshore. Assuming that happens, we will turn slightly cooler and less humid on Tuesday and Wednesday. I’d expect highs in the 70s and lows in the 60s.

Nothing too special there, but it’ll feel refreshing at least! That front may actually come through with a little oomph on Tuesday morning, and I wouldn’t be shocked to see a line of thunderstorms douse everyone with a half-inch to inch of rain and some thunder.

After Wednesday, the front will probably push back onshore Thursday, ushering back in warm and somewhat humid conditions before the next front. When will that arrive? Maybe next weekend? We’ll see. Model guidance has been a little wonky in the extended range lately in terms of timing and strength of fronts, so I don’t want to overpromise anything.

Tropics

Yes, it’s November 1st, and yes Houston’s hurricane season is (historically) done. We don’t need to worry about the system in the Caribbean with a 70 percent chance of development.

However, it could be a player in the weather across the western Caribbean next week. We can’t get too specific on anyone’s forecast, but if you’ll be traveling to the western Caribbean or Central America next week, keep tabs on things at our companion site, The Eyewall.

In brief: Houston will see more of the same through Monday or so, with temperatures running around 7 to 10 degrees warmer than normal and lots of sunshine. We turn up the humidity after Tuesday with increasing rain chances, though the best rain chances may end up to our north. Halloween evening will be warm with at least some chance of rain.

40 years ago today was Houston’s (official) 4th wettest day on record, with hundreds of flooded homes and 10 inches of rainfall. The culprit was a stalled out cold front and several prior days of rain that had primed and saturated the ground. The current forecast has nothing remotely resembling rain until next week.

Today through Sunday

The next few days should feature more of the same in Houston. Expect plentiful sunshine, generally pleasant mornings in the 60s, and afternoon highs in the upper-80s, about 7 to 10 degrees warmer than normal and not far from records. Each morning could see pockets of dense fog in the area, so just be mindful of that. A reinforcing shot of drier air may help shave off a few more degrees on morning lows tomorrow or Sunday, but that should be the only evidence of it that we notice.

Monday & Tuesday

We begin to slowly transition here to a more humid type pattern. Look for daytime highs to stay in the mid to upper-80s, with nighttime lows in the 60s to low-70s. More sunshine is expected, but I would not entirely rule out an isolated shower on Tuesday.

Rest of next week & Halloween

The forecast becomes pretty straightforward in a generic sense after Tuesday. We will have clouds, sun, high humidity, and a chance of showers developing. Look for much warmer nights and mornings and slightly less hot afternoons. The highest chance of rain will probably be Wednesday or Thursday. Yes, there is a chance of rain on Halloween, but it remains much too early to get specific. We are confident that it will be a warm evening though.

I am a little concerned that the best rain chances will elude us to the north after Wednesday, but we still have time to watch this. Rain totals through Thursday are shown above, as forecast by the NWS. Expect some variability here with some places seeing minimal rain and others seeing perhaps an inch or two.

Next cold front?

There continues to be model evidence of a cool front after next weekend. Exactly how strong and when exactly it arrives remains to be seen. I’d still keep my expectations low, but the signal has remained at least!

Why the struggle to cool off?

Yesterday, Eric noted how the 6 to 10 day outlook showed warm temperatures leading into November. Now, as noted we are hopeful for a cool front somewhere around day 10 or so, but it will be unlikely to deliver actual *cold* air. In order to get true cold here in Texas, it usually either has to come straight outta Canada and down the Plains, your typical ‘norther. Or it has to be manufactured more locally, usually by clouds, rain, and chilly but not necessarily truly cold temperatures. That latter scenario happens to us sometimes in later November through March most often. This time of year, for hints of something beyond just an autumn tease or a setup for more frequent cool fronts, we would probably need to see cold air building up in western Canada.

If we look at the Euro ensemble forecast of jet stream winds on the maps above, you’ll notice what is basically a straight shot of green, yellow, orange, and red from China and Japan to southwest Canada. This is the core of the jet stream, and when it is doing this (extending across almost the entirety of the Pacific into Canada), it basically limits how cold it can get up there. It keeps weather active, it ushers in storms, but it never allows any cold to settle. Without that, we kind of have an elevated floor for how cold it can realistically get down here in Texas, as any cold coming out of Canada would be weak to begin with and continue to modify milder as it came southward. This can all change quickly, but there’s absolutely no sign of it right now in any real modeling. Until that gives, expect milder than normal weather to continue more often than not. We’ll still have periodic fronts, but they’ll mostly just reinforce comfortable humidity levels more than anything. Certainly not a bad thing, but it would still be abnormally mild.

In brief: More of the same is expected over the next few days in Houston, with cool-ish mornings and very warm afternoons, along with a good bit of sunshine. The weather pattern changes for a time next week toward humid with rain chances. Then, perhaps we can await our next front.

About 800 miles separate the two portions of Texas that have done well in the rain department this month: The mouth of the Rio Grande and the tippy top of the Panhandle. New Mexico has outperformed Texas, even with some serious flash flooding there recently.

But in general, we are far from alone right now in this dry pattern. The next couple weeks will bring us more of the same but also some potential for change, particularly next week. I think looking at the European ensemble for low temperatures the next two weeks shows how the pattern splits into 3 differing acts of weather.

Act I: The stable period through Sunday

Over the next several days, things will be pretty calm. We can expect daytime highs in the upper-80s, just a couple degrees shy of daily records. But if you want some autumn flavor, the mornings will remain fairly cool, in the 60s. These temperatures are still solidly at least 8 to 10 degrees warmer than usual. Rain chances will remain nil. We will get a weak reinforcing shot of drier air Friday that should extend this weather through at least Sunday and possibly Monday.

Act II: Revenge of humidity and rain chances

Next week sees a change. We’ll have both more unsettled weather and increasing rain chances, as well as much more humidity. Overnight lows will likely shift into the low-70s, about 10 to 15 degrees warmer than normal, while daytime highs will hold steady or even fall a few degrees due to clouds and rain chances.

I think we want to be realistic about rain chances next week. In a drought, sometimes you find ways to fail, and while I would still expect at least an inch or so of rainfall from scattered thunderstorms next week, the heavier rains, the 2 to 4 or 5 inch totals will probably be confined to a narrow corridor somewhere in the area along or northwest of highway 59. Something we will continue to watch. The European operational model shows this well below as a possible example of what could occur.

Regardless, we will see just a warm, humid, un-autumn-like week next week.

What this means for Halloween remains partially unclear. There will almost certainly be a chance of rain, but it will almost certainly also be warm. So plan for warm right now, but check back with us on the rain chances which may not become clear until early next week.

Act III: Additional autumn?

After next week’s pattern shift, we could see a return to something more typical for autumn. I would say there’s probably a 40 to 50 percent chance of a meaningful cold front around next weekend. The exact timing is uncertain, but there’s enough signal in the models for us to think there’s a decent chance. We’ll keep watching.