Back on Friday, I wrote in our weekend forecast discussion that “if the chance of a shower is about 10 percent Friday and Saturday, maybe it inches up to 15 or 20 percent Sunday.” We pride ourselves on honesty here at Space City Weather, and that will end up likely proving inaccurate. The reality is that compared to Friday, our Monday front is a bit faster and has a burst of upper level support in the atmosphere this afternoon which should allow storms to blossom today.
Radar is quiet as of this writing, but as an upper level disturbance interacts with the ample heat and humidity over our area, it may be just the trigger needed for strong thunderstorms to develop north of Huntsville and Conroe by about 3 or 4 PM. We expect a complex of storms to develop up that way and drop into places like Conroe and The Woodlands between 7 and 9 PM or so.
After that, things do become a little more uncertain. Most modeling does bring those storms into the I-10 corridor and possibly points south after 8 to 9 PM or so. We’ll see if the storms can survive the trip, but the bottom line is a likely dry afternoon for Houston and points south, with storm risks increasing later in the evening.
This does not look like a high-end severe weather outbreak, but storms could certainly become strong to severe as they drop through the region. We are in a “marginal” risk (1/5) of severe weather. Hail is a possibility, but as is often the case in these sorts of setups, strong winds may be the more common problem. With the storms moving at a pretty healthy clip, look for gusty winds ahead of the rain this evening, especially north of I-10.
Storms should dissipate or move offshore overnight, leaving us mostly quiet to start Monday. We can’t rule out more showers and storms tomorrow. The cold front should arrive later tomorrow, ushering in slightly less humid air for midweek, which will be most noticed at night via slightly cooler nighttime lows. Eric will have more on that in the morning and an update on the tropics, which he has already touched on today.
The meteorological phenomenon we call “August” has mostly lived up to its normally unpleasant expectations so far in the Houston area. After hitting 101° on Wednesday, we topped off at 99° yesterday. Overnights have been especially oppressive, with Galveston tying an all-time record warm low temperature on Wednesday and Hobby Airport blowing through its record for most 80 degree mornings in a year already. We will have a post with a lot more on this coming soon. In the meantime, we expect no relief this weekend, but there are signs we should begin to cool off a bit next week. Let’s discuss.
Today through Monday heat
A heat advisory continues for the entire region both today and tomorrow, and we would not be shocked to see it extended into Sunday and/or Monday as well. Expect mostly sunshine with highs near 100, lows in the 70s to near 80°, and heat index values of 105° to 110° or even briefly hotter at times.
Take it slow and easy in the heat this weekend.
Rain chances and a front next week?
As far as rain chances go, we should not see anything other than an isolated pop-up shower or storm today and tomorrow. If the chance of a shower is about 10 percent Friday and Saturday, maybe it inches up to 15 or 20 percent Sunday.
Monday and Tuesday are complicated by a cold front in the area. Don’t expect anything refreshing next week, but we should see a shift to “less hot” weather and a better chance of scattered showers and storms early. Monday would still be hot with scattered showers and storms in the afternoon. The trade off with a cold front possibly pushing through is that rain chances would drop off again behind the front for later Tuesday and Wednesday. Still, we’ve got a few things to work out regarding the timing of the front and just how high rain chances look. We’ll update you Monday.
Behind any sort of front, we would see high temperatures “only” in the mid-90s and less oppressive heat index values. Lows would be more in the 70s for most.
Tropics
Tropical Storm Josephine formed yesterday in the open Atlantic, the earliest 10th or “J” storm on record by almost 10 days.
Josephine will likely begin to get steered to the north as it passes the islands and is no threat to the U.S.
The only other disturbance outlined by the National Hurricane Center (Invest 96L) is a disturbance off the North Carolina coast that will slide out to sea over the next few days. We expect another wave or two to emerge next week as candidates for development, but it’s far too early to speculate on any other details. We just know it’s likely going to get and stay active.
For those of you scoring at home, the earliest eleventh, or “K” storm was Katrina on August 24, 2005. The earliest “L” storm was 1995’s Luis on August 29th, part of a barrage of storms in the Caribbean islands that year.
Welcome to mid-August. We’ve passed the first couple of months of this hurricane season in the Houston area without too much heartburn. The good news today is that we don’t have much specific on our radar that is of concern for the Gulf. The bad news is that we are anticipating that by late August there will be multiple areas to watch.
Tropical outlook in a sentence
A disturbance that may develop in the Atlantic is not a concern for us at this time, however we see signs on models that multiple tropical waves will be worth monitoring heading into late August.
Invest 95L
The disturbance in the Atlantic that is the most pressing at the moment is tagged as Invest 95L. It’s pretty far out there still, about 1000 miles west of the Cabo Verde Islands, or a little short of halfway to the Caribbean.
As of Tuesday morning, the National Hurricane Center says it has a 90 percent chance of developing into a tropical system over the next two to five days. On satellite today, 95L has a decent area of thunderstorms associated with it, but it seems to lack any kind of organization at this point.
The window for Invest 95L to develop is fairly narrow. We expect whatever it becomes to run into some serious wind shear as it moves toward the Caribbean. In addition, the system should be steered west around high pressure in the Atlantic, with a weakness in that ridge allowing it to gradually gain some latitude. We feel that will be enough to either allow for an escape out to sea or to dissipate the system well before it gets to the U.S., and we probably wouldn’t register this as something you need to worry about for the moment.
There should not be any real surprises about the overall weather pattern over the next several days, as standard summer fare looks to be the rule for the Houston area.
Today
Friday might be the best opportunity for us to not see rain over the next week. Those rain chances certainly are not zero today, but any activity is expected to be minor and isolated. Sunshine should rule, with hot temperatures peaking in the mid-90s, give or take.
Heat index values could push 105° at times, a theme that will continue through the weekend.
Weekend
The weather this weekend should be fairly typical for summer with sun, clouds, highs in the 90s, lows in the 70s, and a requisite 20 to 30 percent rain chance each day. Chances may be slightly higher Sunday over Saturday, but it’s possible you could see a passing downpour on either or both days.
Next week
I believe Monday has a decent chance at being very similar to today, with mainly sunshine and mid-90s. Tuesday through Thursday should see a bit of a “weakness” open in the upper level weather pattern over Texas that is conducive for more showers and storms to develop. However, this may skew to the east of Houston, meaning rain chances next week look higher in Baytown or Beaumont than they do in Katy or Cypress. Still, expect to at least hear some thunder in the area at times, with sun and clouds and some passing showers otherwise. Highs will be again in the 90s, with lows likely in the 70s.
Total rainfall over the next week will be low on average, with some folks likely seeing no rain at all. Others may pick up an inch or two in isolated spots as a slow moving downpour passes. The takeaway here is that we don’t see any sort of organized, significant rain chances through at least the middle of next week.
The National Hurricane Center’s 5-day outlook map is nice and blank this morning; good news for sure. The next item to watch may or may not develop, but it would likely appear on our radar by midweek next week. We have talked about the expectation that things will rev up later this month, so let’s enjoy the quiet now. Worth noting, NOAA’s seasonal hurricane outlook was revised yesterday, and like Colorado State’s the day prior, it calls for a very, very active close to hurricane season.
For those of you scoring at home, that would be 10 to 16 additional tropical storms, 5 to 9 additional hurricanes, and 3 to 6 major hurricanes between now and November.
It’s important to understand what these seasonal outlooks are not predicting: A direct hit on Texas. Yes, that certainly could happen again, but we have seen seasons in the past that have been extremely active and spare Texas. Take 1995 for example. It was the 5th most active season on record (based on Accumulated Cyclone Energy), and yet Texas was only impacted by Tropical Storm Dean, a minor flood event. I remember 1995 well because I was a 13 year old weather weenie walking around with a t-shirt that had every storm plotted on the back. The Caribbean Islands were raked that season, but the western Gulf was spared (the eastern Gulf took a late season hit from Opal in Florida). Most of the storms in 1995 were “fish” storms that recurved north and northeast in the open Atlantic. I’m not going to tell you that this year will behave that way; we just don’t know. But I know a lot of folks see these forecasts and fret, justifiably so. We are not thrilled by the long-term signals of high activity either, but there are no guarantees in weather. Eric touched on this thoroughly on Wednesday. Hurricanes are a part of life on the Gulf Coast, so your best antidote to fear is preparedness. That’s where our mindsets should be right now.