Eric Berger

Tropical system in the Gulf almost a depression, threatens Louisiana

Good morning. As of 4am CT, the system in the Gulf of Mexico has nearly organized into a tropical depression (named Barry), and likely will become one later this morning or early this afternoon. While Texas isn’t entirely out of the woods, as there remains some uncertainty in the track and intensity forecast, this increasingly looks like a threatening situation for Louisiana. Because the state is next to Texas, and we have received so many questions from people living in, or traveling through Louisiana, we will continue to offer comprehensive coverage of Barry as the storm develops. If you’re living in Houston, please continue to pay attention to forecasts for the next couple of days, as tropical weather invariably offers up surprises. However, it’s probably safe to go about your business as usual this weekend.

Satellite image of the tropical system shortly after 3am CT Thursday. (NOAA)

Track

Confidence is increasing in the forecast track for a couple of reasons. First of all, we’re now likely only about 2.5 days away from landfall (likely along the Louisiana coast between Lake Charles and New Orleans), and errors for such a storm are typically less than 100 miles, even given the uncertainty with Barry. Secondly, although Barry has not yet formed a distinct center of circulation, there is nonetheless a decent clustering of ensemble members of the global models around such a solution. So a Louisiana landfall is likely for Barry, but not a certainty.

National Hurricane Center track forecast for the Gulf system as of 4am CT Thursday.

Intensity

Because Barry has not yet organized into a tropical storm, and perhaps only has a couple of days remaining sufficiently offshore, this should help to set a limit on its intensity. The official forecast still brings Barry to minimal Category 1 hurricane status prior to landfall, but confidence isn’t particularly high.

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Barry likely to form soon, already bringing heavy rains to Louisiana

Good afternoon. Based upon the latest model data, not a whole lot has changed in the forecast from early this morning. That is to say, there is not a whole lot of additional clarity, but nor do we have reasons for heightened concerns for Texas.

As expected, the National Hurricane Center went ahead and began issuing advisories on what will almost certainly become Tropical Storm Barry—citing it as a potential tropical cyclone. Here is the official forecast track as of 10am CT, and I would not anticipate much change when the hurricane center updates at 4pm CT.

Official track forecast as of 10am CT. (National Hurricane Center).

There are several big questions that are driving uncertainty in the track forecast. One is where the center of the storm ultimately develops, as this could cause a significant shift in the track (i.e. further to the southwest would lead to a more westerly track, closer to Texas). The second big steering issue concerns an upper-level system over the Great Lakes that will help to break down a ridge of high pressure over the plains states. The sooner this ridge weakens, the sooner the storm can begin to move north instead of being forced westward.

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One more wet day, then high pressure begins to take control

The overall pattern remains more or less the same. We’re going to have one more potentially wet day—although as we saw Tuesday, these showers are most definitely hit or miss—before things begin to dry out on the Fourth of July and then remain that way for awhile.

Wednesday

We’re still feeling the effects of tropical moisture pushing in from the Gulf of Mexico, and some of the high-resolution models are fairly bullish on rain totals for today. But at the same time, there’s no significant forcing to really generate sustained, heavy rainfall. So I think like we saw Tuesday, there may be a few isolated areas that see 3 inches of rain, but for the most part, most of the city should see 1 inch of rain or less. In any case, the biggest threat is probably some brief street flooding. We’ve got one more day with potential highs in the 80s before Houston begins to experience more typical summertime heat.

The HRRR model shows the potential for scattered, strong storms at 1pm Wednesday. (Weather Bell)

Fourth of July

Rain chances for Houston will fall down to below 20 percent, but we can’t entirely rule out some daytime showers. An atmospheric disturbance will linger north of the region, so areas along and north of Texas 105 may see better rain chances during the daytime. With partly sunny skies, highs probably will get into the low 90s for most of Houston. Almost everyone should see partly cloudy skies, temperatures in the 80s, and no rain for fireworks.

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Two wettish days before drier weather arrives for July 4th

With a moist moist airmass moving inland on Tuesday and Wednesday of this week, we can expect elevated rain chances for a couple of days before high pressure settles in over the region. From July 4th through much of next week, Houston should see serene, hot, and sunny weather.

Tuesday

It’s a sultry morning, as one might expect during early July in Houston, with lows only in the upper 70s. The radar should remain fairly sedate until around 11am or noon, when the combination of daytime heating and those increased moisture levels start to produce fairly widespread, moderate-to-strong thunderstorms. Most of the area will probably see less than 1 inch of rain today, but there probably will be some bullseyes that receive 2 to 3 inches. Favored areas are probably south of Interstate 10, with perhaps the heaviest rain focused on Brazoria County. We’re always a little concerned about the potential with this kind of tropical moisture during the summer months, but as of now there don’t appear to be any forcings to really produce sustained, heavy rainfall that could lead to more than brief street flooding.

NOAA rain accumulation forecast for now through Thursday. (Pivotal Weather)

Storms should wind down from 6pm to 9pm with the loss of daytime heating. High temperatures today will either be in the upper 80s or low 90s, depending on the extent of rain for your area.

Wednesday

This should be a similar day to Tuesday, albeit with perhaps a bit less coverage. I’ll feel more confident in Wednesday’s forecast after we see what happens on Tuesday.

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