Matt Lanza

Today ended up being a mostly quiet one again for most of the region, with just a few showers here and there. Rainfall since about 7 AM today has been more than manageable with most areas seeing minor amounts. A couple areas, notably up toward Conroe and south toward Santa Fe and Galveston have seen close to or in excess of an inch of rain since 7 AM today.

So we’ve done alright so far. Heading into tonight, I will level with you: Eric and I are scratching our heads a bit. Yesterday, it appeared we had a pretty favorable setup for heavy rain leading into the nighttime, and yes it materialized, but not in the way we were anticipating until late in the game. Tonight we are presented with a set of data that is different than yesterday but does offer up some risk of heavier rainfall in spots.

Brace yourselves, some serious nerd-speak is coming in this paragraph: I just dug through a lot of the meteorology here, and what I’m coming up with does make me think some areas could see some locally heavy rainfall tonight. For one, we have a weak upper level low over Southeast Texas. Those are notoriously fickle systems, and they can become more active at night. Second, it appears there is some sort of weak boundary at the surface that’s roughly along US-59/I-69 from Victoria through Houston that then arcs to the east toward Beaumont. Boundaries like this can act as focusing points for thunderstorms. Third, model parameters suggest a good bit of instability in the atmosphere tonight. Higher instability means thunderstorms can develop and sustain themselves. Fourth, models suggest plenty of atmospheric moisture is available right now. Observations back this up, as the weather balloon launched at 7 PM from Lake Charles shows precipitable water values in the 90th percentile for this time of year, which means if storms can get going, they can rain heavily. Lastly, it appears that winds about 5,000 feet above the surface are going to increase off the Gulf from south to north tonight, aimed east of Houston. Winds at that level can act to provide additional ingredients and moisture needed for heavy rainfall.

This is a long winded way of saying that the meteorology that’s showing up right now backs up the idea that we could see some heavy rainfall tonight.

The question, as always, is can the ingredients actually come together in such a way to allow this to transpire. I really don’t know. These are fickle, tricky situations, so there’s always a chance a few things don’t happen and you end up with a couple isolated showers and storms and that’s that. But, if things do come together, we could be talking about repetitive showers and storms for some areas.

So, for most of the area tonight, let’s just call it a few showers or a storm possible. Some folks will see nothing. Others some heavy rain for a time. Totals of a quarter inch to an inch.

Put a pin over downtown Houston and if you go south of there and east of there, you stand the chance of seeing perhaps some more sustained rainfall. In those places, I would say your odds of seeing a quarter inch to inch of rain are higher than northwest of Houston. There may also be a few isolated locations that see as much as 2 to 4 inches of rain or a bit more in a worst case scenario. The odds of that happening are not high, but as I laid out above, the ingredients are certainly in place. If I had to focus on an area tonight for the highest risk of this it would be from Baytown to Beaumont.

Anyway, we just wanted to provide some situational awareness for you this evening. Be safe!

Over the last couple weeks, I’ve turned into a statistics machine, focused on one value: Dewpoints. Not gonna lie, it’s been fun. Anyway, here’s another one for you today: As of yesterday evening, we had amassed 132 hours of dewpoint values at or below 65°F this month. Since 1990, the most hours in the month of June that comfortable was 197 hours in 2006. So, yeah, it’s been kind of great this month, as Junes go. Of course, as Eric alluded to yesterday, we really do need some rain. And we are going to get both the return of humidity and higher end rain chances as we go through the weekend and into next week.

Today

Yesterday was the 5th consecutive day with a high of 94° in Houston. Today could well be the 6th in a row. Expect a day much like yesterday with sunshine and some passing clouds. Rain chances aren’t zero, but they’re minimal for most of us. Areas south and west of Houston stand the best chance for some slow moving downpours this afternoon.

Saturday & Sunday

Whatever is left of our dry air will work its way off to the east by tomorrow, and we should be hot and humid. Rain chances will inch up with that change, as atmospheric moisture cranks back up closer to what is normal for this time of year.

If Friday carries a 20 percent chance of a shower, Saturday and Sunday would probably carry about a 30 percent chance or even a bit higher. Any showers could be locally heavy this weekend. Look for morning lows in the 70s and afternoon highs in the low- to mid-90s on both days. With higher humidity, expect it to feel more like typical Houston summer, with heat index values back up at or above 100° each afternoon.

Monday through Wednesday

The atmosphere will pick up even more available moisture early next week, which should be enough to allow for numerous showers and thunderstorms each day. For any given location early next week, rain chances probably “only” reach 40 or 50 percent each day, but there will be a pretty good chance that most of us see at least some rain in that timeframe. Any rain could be heavy at times. It will be warm and humid with highs around 90°, give or take a couple degrees and lows in the mid- to upper-70s inland (80° or so at the coast).

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Since Wednesday’s cold front, Houston has had 50 consecutive hours of dewpoints below 60°, which continue as of 7 AM Friday. Recall, dewpoint is a much better gauge of “comfort” in summer than relative humidity, and for Houston anything below 65° generally feels really nice this time of year. Anything in the 50s is very comfortable. To put in context how rare an event this is in Houston in summer. We have only done 40 consecutive hours of dewpoints in the 50s in June, July, or August two other times since Bush Airport was established as the official reporting station for Houston in 1969:

• June 8-9, 1996 (43 consecutive hours)
• June 24-28, 1974 (110 (!) consecutive hours)

It appears that this one will place firmly 2nd on the list. This air mass would be a first ballot inductee to the Hall of Fame of Comfort for Houston summers. And it continues.

We do have a couple things to monitor. This dry weather is going to have an impact on soil moisture in much of Texas. We’ll discuss that more in-depth next week. In addition to that, this dry, offshore breeze is certainly aggravating for allergy sufferers (raises hand). But other than that, we have little to talk about.

So in lieu of much text today, our forecast will be shared primarily in gif form.

Today & weekend

It will be tough to let go of the current weather pattern. Thankfully, this weekend won’t be too bad!

Expect highs in the 90s and lows in the 60s or low 70s this weekend, with continued low humidity for June. Sunshine and nil rain chances.

Next week

Onshore winds resume Monday, and that means our friendly neighborhood Houston humidity will be on the rise.

But it won’t be that bad of a week.

Alright, yeah, it will end up being a pretty hot week. Look for mid-90s at least, with lows in the 70s.

The next chance of any meaningful rain at all, outside of a localized downpour? Maybe next weekend?

We’ll check back in with you on Monday with more. Enjoy the weekend!

Yesterday was Houston’s hottest day since May 20th. We hit 94° on Thursday, and that’s a preview of things to come. We have no real changes in our expectations that Cristobal (now a depression) will miss to our east. The main impact from Cristobal in Houston will be heat, thanks to drier air on the western fringe of the storm.

Today

Expect a quiet Friday overall. We’ll start with some patchy low clouds or fog in spots but transition to partly to mostly sunny skies this afternoon. Highs will be in the low-90s for Houston, cooler at the coast and hotter inland. Yes, a few showers or slow moving downpours could again flare up with daytime heating, but we expect most of the area to stay dry.

Saturday

Rinse and repeat. Cristobal will still be well off to our southeast at this time, and we should see mostly a repeat of Friday’s relatively nice (albeit hot) summer weather. Perhaps one or two will see a cooling downpour, but most will not. Highs will again average in the low- to mid-90s.

Sunday

As long as Cristobal keeps tracking toward central or western Louisiana as expected, that would likely mean a dry and hot day on Sunday. Expect mid-90s.

I try to view things as optimistically as possible, so I’ll just add here that while Sunday will likely be hot, it will be a little less humid than we have been of late. So we’ve got that going for us, which is nice.

Showers on Sunday? Probably not many. Part of Cristobal’s cloud canopy could be noticeable east of I-45, which could mute temperatures a little in those areas. But rain would probably stay in Louisiana on Sunday.

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