Does the Thunderstorm "Bubble" Really Exist?

Have you ever watched a promising thunderstorm barrel toward you, only to see it fall apart or shift course at the last second? It can be frustrating to expect the cooling relief of a nice deluge—only to be left high and dry as you watch the dark clouds fade away on the horizon.

It’s common to describe this phenomenon as a “bubble,” a perceived forcefield hovering over your town that seems to deflect storms when you want them the most. There’s even an XKCD comic about it. Of course, those mythical deflectors don’t exist, but why do storms seem to consistently hit certain areas, while often skipping nearby towns?

Some local features, like large, cool bodies of water or tall mountains, really can affect how thunderstorms behave. But for the most part, a storm suddenly missing one location is mostly the result of how these bubbling masses of air and moisture evolve throughout their short lifecycle.

There are three common types of thunderstorms—single-cell, multicell (think squall lines), and supercells. The latter two categories are commonly associated with organized severe weather outbreaks. By far the most common type of thunderstorm around the world is a single-cell. This is a small, localized burst of convection often called a pop-up, popcorn, or garden-variety thunderstorm.

If there isn’t a focus point for thunderstorms to develop—something like a cold front or a sea breeze—the exact location where one of these warm weather torrents develops is usually pretty random. A storm will pop up, produce lots of lightning and heavy rain for a little while, and then start to dissipate. The cold air rushing away from the decaying storm will serve as a focus for more thunderstorms to develop nearby. Whether or not you get hit by an approaching thunderstorm depends on how healthy it is, and if any other storms form in its wake. In other words, if a storm falls apart a block away from you, it’s usually a stroke of atmospheric luck.

If you average out precipitation trends over a long period of time, the data show that rainfall is pretty evenly distributed between neighboring communities. One storm could miss you and hit the town next door, while the storm that hits you missed your neighbors down the street. It balances out with time.

However, there are some cases where certain towns benefit from their surroundings when a thunderstorm is on its way. Thunderstorms can start to weaken as they approach more stable air near cool bodies of water like the Atlantic Ocean or the Great Lakes. There is also some truth that mountains are less conducive to storms, as the rough terrain and cooler temperatures can disrupt the updraft and temporarily weaken storms as they traverse the terrain. That certainly isn’t always the case, though—there are plenty of rocking storms along the coast and in the mountains every season.

So for the most part, if a thunderstorm looks like it’s coming straight for you and then disappears into thin air, it has less to do with where you live and more to do with the fragile, fluid structure of these magnificent natural formations.

What is a Polar Vortex?

Edward Stojakovic, Flickr // CC BY 2.0
Edward Stojakovic, Flickr // CC BY 2.0

If you’ve turned on the news or stepped outside lately, you're familiar with the record-breaking cold that is blanketing a lot of North America. According to The Washington Post, a mass of bone-chilling air over Canada—a polar vortex—split into three parts at the beginning of 2019, and one is making its way to the eastern U.S. Polar vortexes can push frigid air straight from the arctic tundra into more temperate regions. But just what is this weather phenomenon?

How does a polar vortex form?

Polar vortexes are basically arctic hurricanes or cyclones. NASA defines them as “a whirling and persistent large area of low pressure, found typically over both North and South poles.” A winter phenomenon, vortexes develop as the sun sets over the pole and temperatures cool, and occur in the middle and upper troposphere and the stratosphere (roughly, between six and 31 miles above the Earth’s surface).

Where will a polar vortex hit?

In the Northern Hemisphere, the vortexes move in a counterclockwise direction. Typically, they dip down over Canada, but according to NBC News, polar vortexes can move into the contiguous U.S. due to warm weather over Greenland or Alaska—which forces denser cold air south—or other weather patterns.

Polar vortexes aren't rare—in fact, arctic winds do sometimes dip down into the eastern U.S.—but sometimes the sheer size of the area affected is much greater than normal.

How cold is a polar vortex?

So cold that frozen sharks have been known to wash up on Cape Cod beaches. So cold that animal keepers at the Calgary Zoo in Alberta, Canada once decided to bring its group of king penguins indoors for warmth (the species lives on islands north of Antarctica and the birds aren't used to extreme cold.) Even parts of Alabama and other regions in the Deep South have seen single-digit temperatures and wind chills below zero.

But thankfully, this type of arctic freeze doesn't stick around forever: Temperatures will gradually warm up.

A Simple Trick for Defrosting Your Windshield in Less Than 60 Seconds

iStock
iStock

As beautiful as a winter snowfall can be, the white stuff is certainly not without its irritations—especially if you have to get into your car and go somewhere. As if shoveling a path to the driver’s door wasn’t enough, then you’ve got a frozen windshield with which to contend. Everyone has his or her own tricks for warming up a car in record time—including appropriately-named meteorologist Ken Weathers, who works at WATE in Knoxville, Tennessee.

A while back, Weathers shared a homemade trick for defrosting your windshield in less than 60 seconds: spray the glass with a simple solution of one part water and two parts rubbing alcohol. “The reason why this works,” according to Weathers, “is [that] rubbing alcohol has a freezing point of 128 degrees below freezing.”

Watch the spray in action below.

[h/t: Travel + Leisure]

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