Shower chances slowly ease back late this weekend across the Houston but not entirely

In brief: While numerous rain showers will continue in the Houston area today and probably tomorrow, the overall trend will be toward slightly less coverage toward Sunday. This should lead to a rather classic June week next week with heat, humidity, and hopefully some cooling downpours each afternoon.

Numerous showers and thunderstorms have impacted the region the last few days. Pockets of the area have seen as much as 3 to 5 inches of rainfall. Are we heading for a repeat of last summer, where it rained basically every day somewhere? Too soon to say, but we’re off to a tolerable start to summer to say the least.

Today and tomorrow

We’ve got a batch of showers that’s been following I-45 south of Downtown and then 290 and 249 northwest of Downtown since the overnight hours.

Radar as of 6:25 AM Friday showing the orientation of rain showers. (WeatherFront)

For the rest of today, we are expecting numerous showers and some thunderstorms across the area. Coverage may focus away from the coast today. Some areas will skate around the rain, but others will cash in once more. We should do it once again tomorrow, though I would not be shocked if we see a few heavier storms embedded tomorrow too. We’ll top off in the mid-80s today and mid to perhaps upper-80s tomorrow if we have just a little less coverage.

Sunday

By the end of the weekend, rainfall coverage should back into more of a typical summer pattern. Heavier showers will be near the coast in the morning, then perhaps inland by afternoon. But overall coverage should begin to scale back some here. Highs will be around 90 degrees.

Next week

For most of next week, we establish a very June weather setup across Southeast Texas. Sun, clouds, isolated to scattered afternoon thunderstorms, heat, and humidity. Highs will be in the lower-90s, hopefully with many of us seeing some cooling afternoon downpours. One note about next week: I think we’re going to see nighttime lows start to rev up a bit.

Approximate forecast morning lows on Wednesday. (WeatherFront)

We’ve only had four mornings this year above 75 degrees at Bush Airport (compared to 14 at this same point last year). We should string together several of them next week. As we prep for the endless World Cup events across the area, it’ll definitely feel the season. More for you Monday!

Houston’s stormy pattern continues for a few more days, but hotter weather is on the horizon

In brief: We discuss the high levels of atmospheric moisture in today’s post, and explain how widespread showers and thunderstorms are likely through Friday. Some storms may persist into the weekend, but next week looks likely to be hotter and drier.

Plentiful atmospheric moisture

Atmospheric moisture continues to surge in from the Gulf of Mexico, and in the absence of high pressure this is allowing for ongoing showers and thunderstorms across the region. We measure atmospheric moisture levels by “precipitable water” which basically means if you took a column of atmosphere from the surface all the way to outer space, how much water is there? Generally speaking 2 inches, or more, is very favorable for rainfall. This morning we are seeing 2 to 2.25 inches across much of the region, and levels will remain high for several days more.

We are not too concerned about flooding because the storms remain fairly progressive, in that they are moving through with a decent pace, and local stream and floodways continue to drain well. Nevertheless we’ll continue to keep an eye on things.

Estimated precipitable water at 5 am CT on Thursday. (Weather Bell)

Thursday

We are likely to see widespread showers and thunderstorms today, with highly variable accumulations from low tenths of an inch to perhaps some locations seeing as much as 2 inches. This will help moderate high temperatures this afternoon. Areas with clouds and rains will likely top out in the low- to mid-80s, whereas areas that see sunshine for a couple of hours this afternoon may push 90 degrees. Some rain chances will continue overnight, with lows falling into the mid-70s.

Friday

This is likely to be a similar day to Thursday, with the likelihood of widespread showers and thunderstorms across the region. It’s possible that we see a little more sunshine on Friday afternoon, in which case high temperatures for most locations will reach the upper 80s. We will continue to see plenty of humidity and warm nights.

Saturday and Sunday

So what of the weekend? What of it, indeed. I think we’ll see diminution in coverage by showers and thunderstorms, but most of our available guidance indicates we’ll still see some activity. In addition, the precipitable water levels discussed above will remain fairly healthy. Accordingly I expect about a 40 percent chance of showers and thunderstorms each day—but given some lingering uncertainty we may still need to adjust this forecast. Highs on both days should be around 90 degrees, with plenty of humidity. It certainly won’t rain all day every day.

Our high temperatures are likely to rise steadily over the next 10 days. (Weather Bell)

Next weekend

It looks like high pressure may try to encroach from the east-southeast next week, and if it does this should lead to sunnier weather, highs in the low-90s, and rain chances falling into the 10 to 20 percent range for much of next week. That’s what things look like today, anyway. As always, we’ll have to see.

On Tuesday morning Houston’s freeways created clouds of their own

In brief: Houston’s daily storm chances will remain high the next couple of days, with activity likely peaking during the afternoon hours. Also, we discuss a rare phenomenon observed on Tuesday, when clouds formed directly over the region’s freeways!

Visible satellite image at 8 am CT on Tuesday. (Ethan Mok/X)

Freeway induced clouds

Yesterday a storm chaser named Ethan Mok shared satellite images from around 7 am to 8 am CT showing Houston in the visible spectrum. In them, remarkably, clouds lined up directly over most of the freeways in the greater Houston region. Quite clearly these interstates, particularly the Katy Freeway with its more than two dozen lanes, were inducing their own micro-climate.

I’m not sure precisely what is happening here, but it must be a combination of several factors. Winds on Tuesday morning were very light, allowing heat from the concrete surfaces (which were warmer than the surrounding air) to rise almost straight up. In addition, particulates from vehicle exhaust provided nuclei for water vapor to condense around, creating seeds for clouds.

We don’t, frankly, understand exactly why it happened on Tuesday morning, or whether this is a particularly common feature. I have never seen a manifestation like this, however. It does highlight that one of the more active areas of meteorology research is how cities change weather. A recent study, co-authored by a Texas A&M University atmospheric sciences professor (and friend of the website) named John Nielsen-Gammon, found that cities can boost pop-up thunderstorms.

Wednesday and Thursday

We saw widespread showers and thunderstorms on Tuesday, with some of the more efficient cells producing upwards of 2-3 inches of rainfall. Our overall pattern will remain similar for today and Thursday. Most of the area is likely to see rainfall during the next 48 hours, but amounts will vary significantly, from low tenths of an inch to 1 to 2 inches. Like on Tuesday, some of these thunderstorms could briefly turn severe as they rumble through. Skies will be partly sunny during the afternoon, with highs likely in the mid- to upper-80s.

NOAA rain accumulation forecast for now through Sunday. (Weather Bell)

Friday, Saturday, and Sunday

We’ll see continued rain chances this weekend, however the daily likelihood of showers will probably fall back to around 30 to 50 percent each day, with any storms most likely to develop during the afternoon hours along with peak heating. Highs each day will be in the vicinity of 90 degrees, a little warmer inland and a little cooler closer to the coast. I could see this forecast trending a little drier or holding the same in terms of rainfall. Hopefully we’ll firm things up by tomorrow’s post.

Next week

The most likely outcome for next week is that Houston temperatures go up a little bit, with highs in the lower 90s, and our daily rain chances fall back to something like 20 or 30 percent daily. Such a pattern would be very typical for early- to mid-June.

Expect healthy shower and thunderstorm chances for the rest of the week

In brief: A stormy pattern will descend upon Houston through Saturday or possibly Sunday. We don’t expect serious flooding, but there will be plenty of showers and thunderstorms to go around, especially during the afternoon hours, so remain weather aware in the coming days.

Stormy pattern

Houston will see a mish-mash of boundaries, weak fronts, sea breezes, and disturbances that will combine with an atmosphere filled with moisture for the rest of the week to produce a daily chance of showers and thunderstorms across the region. Chances each day will vary from about 40 to 70 percent, and there will be the usual pattern of hit-or-miss showers. Overall most of the region will probably pick up 0.5 to 1.5 inch of rain, but given the background moisture available some areas could see higher bullseyes of 3 or more inches. All in all we don’t expect much in the way of flood impacts, but this could prove disruptive to outdoor activities.

Rain accumulation forecast from a blend of models for now through Sunday. (Weather Bell)

Tuesday

At sunrise this morning we’re tracking some storms off the to east of Houston, on the far side of Galveston Bay. These may drift westward, into Houston, during the morning hours, primarily south of Interstate 10. Then, this evening and into the overnight hours, a weak front may produce a broken line of storms that drop down from the north and into the city. Whether these storms hold up all the way into Houston is not entirely clear, but thunderstorms are possible later this evening and overnight. At this time nothing with these storms looks to be too severe. Highs today should be in the vicinity of 90 degrees, with partly to mostly sunny skies. Lows tonight will drop into the mid-70s.

Wednesday

This should be a mostly sunny day with temperatures again reaching up to around 90 degrees. There is something like a 50 percent chance of showers and thunderstorms.

Our region’s daily highs will be fairly moderate for early June. (Weather Bell)

Thursday, Friday, Saturday, and Sunday

During this period of time we are likely to see partly sunny days, with high temperatures ranging from the mid-80s to around 90 degrees. Temperatures will depend on the extent of cloud cover during the afternoon hours, and when showers and thunderstorms roll through. We expect to see periodic rounds of showers, but again there will also be plenty of breaks with some sunshine as well. Storms will be most active during the afternoon and early evening hours, with peak heating. Nights remain quite warm, in the mid- to upper-70s. As we get closer to the weekend we should have some better details about what each of these days looks like, but for now we expect to see a situation in which, during the afternoon, we see storm-o-clock descending upon the region.

Next week

The most likely outcome next week is a little more sunshine, a little less rainfall, and highs around 90 degrees. But do I feel particularly confident in that outlook? I do not.