Eric Berger

After Monday’s superb weather—seriously, was that the nicest day of 2019 so far?—we’re going to return to a more May-like pattern with increasing humidity and warmer temperatures for the rest of the week. We still have some concerns about the potential for storms this weekend, but as for now it appears like the more severe weather will remain north and west of Houston.

Tuesday

It is warmer across the Houston area this morning, with lows generally down around 70 degrees in the city, and a few degrees cooler up north. With partly sunny skies later this afternoon, we can expect high temperatures to reach the mid-80s. We will see some slight rain chances in Houston, perhaps 20 percent or so, with the best potential to the southwest of the region over Matagorda, Wharton, and Colorado counties. Accumulations should be less than a tenth of an inch, or two.

Wednesday and Thursday

These should be a similar days to Tuesday, with low, but non-zero rain chances. Temperatures will be on the upswing, with highs in the mid, and possibly upper-80s by Thursday. Overnight lows will remain decent for mid-May, likely dropping to around 70 degrees in the city of Houston.

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Houston wrapped up five very wet days on Saturday evening, as a weak cold front finally ushered an extremely moist air mass off to the east of the region, and stabilized the atmosphere. Before discussing out more sedate weather ahead, first let’s look back at the five-day rain totals, and whether the flood scale we implemented this month was effective.

This map shows rain totals for the last seven days, and encapsulates the rain event that lasted from last Tuesday through Saturday. The greatest rain totals fell near Sugar Land, in the southwest part of the region, Kingwood, to the northeast, and Beaumont. One area near Sugar Land received 18+ inches, while the bright purple areas indicate 14+ inches. Overall, most of the Houston metro area received 6 to 12 inches of rain. Interestingly, one does not have to go all that far from the metro area to find a region, in this case Brenham, that received less than 2 inches of rain. This gives you some idea of the challenge of forecasting these kinds of precipitation events.

Flood scale

We introduced a flood scale to provide readers with a general expectation about upcoming flood events. Initially, we rated this five-day event as a “Stage 2 flood,” but after the intensity of Tuesday’s storms—which turned out to be the worst of the five days—we bumped these floods up to a Stage 3 event on Wednesday.

This feels about right in hindsight, given the five-day accumulations over some locations, but we’d welcome any comments or thoughts you have about the scale as we continue to refine it. Thursday night’s hail was also notable, and Matt may have some more to say about that the next day or two. Now, on to the forecast.

Monday

After last week’s storms, this week’s weather will be somewhat anti-climatic. Monday should be especially nice, with mostly sunny skies, highs in the low 80s, and for May, fairly dry air. Some clouds, along with southeast winds, return tonight with lows in the mid-60s. This would have been a great weekend day.

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We’re almost there, Houston. Just one more round of showers and heavy rain today, and then we can put the several five days of intermittent heavy rainfall and storms behind us. Fortunately, in comparison to our recent weather, today’s storms do not look too serious beyond their potential to disrupt outdoor activities—and I know there are plenty planned as we’ve been asked about weddings, baseball games, camp-outs and more.

Showers and thunderstorms today will be driven by a disturbance moving up the Texas coast, combined with an extremely moist atmosphere. The best chance for storms today will occur south and east of I-69, near the coast. (Under some scenarios, the heaviest rainfall occurs near Galveston Bay, and under others, it occurs offshore). Generally, I think inland areas—those on the north and west side of I-69 will probably see about 1 inch of rain or less today, while people closer to the coast will see 1-2 inches. Isolated amounts of 3 inches or higher are, unfortunately, possible. The good news is that rainfall rates appear to be more restrained today, so we don’t anticipate any of the crazy 3+ inches per hour we saw over the last four days, which rapidly flooded streets.

Storms will likely develop between 10am and noon across Houston, with a general west to east motion that pushes them out of the metro area between 3pm and 7pm. Good riddance!

After this mess moves out, we should see clearing skies tonight, with rather pleasant weather for Sunday and Monday, with highs in the low 80s and overnight lows in the 60s. It will almost be nice enough for you to forget that June is only a couple of weeks away.

After an ugly round of storms moved through Houston on Thursday night and Friday morning, the region has seen some general clearing today. This is good because several waterways, including Clear Creek in the southeastern part of the metro area, crested above their banks this morning and need some time to recede. Alas, this multi-day rainfall event is not quite over.

Based upon the stability of the atmosphere, we can reasonably expect a mostly quiet evening and probably most of Friday night before storms return to the region on Saturday. There’s not a ton of agreement among the models, but generally we think most of the action will probably be between I-69 and the coast, over Brazoria, southeastern Harris, and Galveston, Chambers, and Liberty counties. (Our concern is that this is where the aforementioned Clear Creek lies). For most of this area, beginning around sunrise or a few hours later, we expect perhaps 1 to 3 inches of rain. That’s not overly concerning, but we can’t rule out a few isolated areas with 4 to 5 inches. For central and northern parts of the region, we expect lesser amounts of rainfall, with perhaps 0.5 to 2 inches of rain. The good news is that none of the forecast models are predicting some of the extreme, 3+ inches per hour rates we’ve seen earlier this week that rapidly led to street flooding.

We will see some thunderstorms with Saturday’s rainfall, but at this time we do not anticipate the kinds of widespread, severe thunderstorms, with hail and rampaging winds, that the region experienced Thursday night. And the storms should mostly develop after sunrise, so hopefully we can all get a good night’s sleep for a change.

Depending on which model you choose, rains should end from west to east, sometime between noon and early Saturday evening. We still expect drier air, with lower dewpoints and sunshine on Sunday, all of which should help begin to dry out the area.