Hurricane season has come: Here are some questions and answers

Hurricane season officially begins later this week, but as we’ve seen with Subtropical Storm Alberto, Mother Nature doesn’t care overly much about arbitrary dates. Nevertheless, it is the time of year to begin thinking about the tropics, and so we’re going to help you get ready with some questions and answers.

Why does hurricane season occur now?

The easy answer is “warmer water,” and it is true that sea surface temperatures above 80 degrees Fahrenheit are generally needed for tropical storms to form, and strengthen into hurricanes. However, seas in the tropics are generally warmest in October, when hurricane season often begins to wind down. There is another factor, wind shear, that is critical. When winds are rough, and blowing as cross directions at different altitudes, storms simply cannot form. Typically, tropical storms will thrive only when wind shear values near the center are below 20 knots. The following graphic, from FEMA’s Michael Lowry, shows why the hurricane season lasts from June through November, but typically peaks during early September.

(Michael Lowry/FEMA)

Help! I’ve seen a really scary forecast on Facebook

Already this season we’ve seen some hyperbolic forecasts on Facebook. In March, a post forecasting doom and gloom for the 2018 Atlantic season went viral, and more recently a post showing a major hurricane hitting Texas in June got passed around. Such “social mediarology” plays on the fears of people, and therefore tends to get shared widely. If you’ll promise to not fall for these kinds of fear-mongering posts, we’ll make a pledge to you: If we believe there is a credible threat to Houston, we will report that immediately. And if we haven’t written about it, the post you’ve seen on Facebook is probably garbage.

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Texas will sit under a big ol’ high pressure ridge this week

Memorial Day weekend has come and gone, Houston’s basketball season has unfortunately ended, and the first named storm has already graced the tropics—I guess we must acknowledge that summer has really and truly come to Houston. This means two things for the upper Texas coast: high pressure, and when there’s not high pressure it means the region is open to tropical moisture. To that end, with the onset of hurricane season, we’ll have some additional content this week. Later today, in fact, I’ll answer some commonly asked questions about Houston and hurricanes. Later this week Matt will talk about how Hurricane Harvey changed the way local meteorologists were challenged and changed by the storm.

Texas is going to sit under a big, fat ridge of high pressure this week. (Weather Bell)

Tuesday

For now, high pressure ridging will remain dominant. There really is not a whole lot to say as we settle into a familiar pattern of warm, sunny days, with high temperatures in the low- to mid-90s, and warm nights in the mid- to upper-70s.

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A few more days of rain chances, then Houston bakes

After a mostly dry month of May, which had led to mounting drought concerns, most of the region has turned considerably wetter this this week. The following rainfall map for the last seven days shows a range of rain totals from 0.10 inch for a few coastal regions to upwards of 8 inches of rainfall for some parts of northwest Houston. If you’ve missed out, we’ll have a few more rain chances through Saturday before we turn quite hot and dry for awhile.

Rainfall totals for the last seven days. Click to enlarge. (NOAA)

Thursday

Conditions Thursday should be a lot like those of Wednesday—with decent coverage of light to moderate rain showers, and a few heavy ones, throughout the daytime hours. Some areas will see some gray skies and hear thunder, but get no rain, while others see half an inch, or so. When it’s not raining, expect partly sunny skies and a high near 90 degrees.

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Rains today, but early summer heat coming to Houston soon

Houston’s pattern of scattered to widespread showers now seems likely to continue for one or two days before tapering off by the middle of Memorial Day Weekend. After this, we’re likely headed into a strikingly warm pattern for late May and early June, with high temperatures in the mid- to upper-90s next week. Summer is coming.

High pressure builds early next week over Texas. (Ominous music plays). (Weather Bell)

Wednesday

Atmospheric moisture levels remain pretty high today, probably around 2 inches of precipitable water for some locations, which generally means there’s a healthy chance of rain. I’d expect that coverage will be slightly more widespread that on Tuesday, with areas that do see rain getting on average about one-half inch. Rain chances are probably better for coastal areas today, than inland. High temperatures will probably rise into the upper 80s under mostly cloudy skies.

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