Scientists Convert Drones Into Tornado-Predicting Machines

Justin1569, Wikimedia Commons // CC BY-SA 3.0
Justin1569, Wikimedia Commons // CC BY-SA 3.0

The storm chasers of the future are lifting off today. Researchers at Oklahoma State University are developing a fleet of data-collecting drones that may help forecasters—and residents of tornado-prone regions—get ahead of dangerous weather events.

Not all storms are the same when it comes to predictability. Hurricanes and blizzards are pretty easy to spot. Meteorologists can typically call them days ahead of time. But tornadoes are wild, and they can whip up suddenly. Right now, our instruments can only spot a tornado 10 to 15 minutes before it happens. That’s simply not enough time for those in danger to get out of the way.

And while weather balloons are useful, their success depends on being in the right place at the right time. "Once dropped, they can’t move and thus are subject to the unpredictable nature of a storm," mechanical engineer Jamey Jacob told Popular Science. The ideal monitoring vehicle will be steerable, durable, and loaded with sensors.

Enter the drones.

Jacob and his colleagues hope to integrate the drones into normal forecasting instrument arrays within the next four years.

"Eventually what we want is to get to a point where you're watching the weather channel," says Jacob, "and they're reporting data that they're getting from the drones, and nobody cares—it's just the data that's coming in."

Once everything is up and running, Jacob told PBS NewsHour, the drones will ideally be able to extend storm warnings from 10 or 15 minutes to as much as an hour—which could give local residents enough time to prepare, batten down the hatches, or evacuate. “And you know that’s really going to save lives in the end.”

Britain Is in the Midst of a Rare ‘Wind Drought’

iStock
iStock

Generating renewable energy in Britain is a little less than a breeze these days: A “wind drought” is halting the country’s wind turbines.

This month’s wind energy output is down 40 percent from the same time last year, New Scientist reports. On average, about 15 percent of Britain’s electricity comes from wind power. Data starting from July 1 of this year put the monthly average closer to 6.9 percent. Last month, turbines were producing less than 2 percent of Britain’s electricity—the lowest output in two years.

That’s with even more wind turbines being installed over the course of the past year, New Scientist says. The data aren’t entirely surprising, though. The jet stream tends to make the UK’s weather drier and calmer during the summer and wetter and stormier during the winter. But the high pressure the jet stream has brought with it this year has been unusually prolonged, scientists say.

“It’s like a lid, it keeps everything still,” UK Met Office spokesperson Grahame Madge told New Scientist. “From the forecast looking out over the next couple of weeks, there doesn’t seem to be any significant change on the way.”

The wind drought shouldn’t cause too many problems in the short term. Electricity demand is low during the summer (very few British homes have air conditioning), and the country’s been able to compensate for the lack of wind by burning more natural gas. If the wind drought continues to persist, though, UK residents may begin to see an increase in utility fees. Natural gas prices have already risen with the increased demand.

“As we continue to transition to a low-carbon energy system, managing the intermittency of renewable power an important role in balancing supply and demand,” a National Grid spokesperson told New Scientist. “However, we have planned for these changes and [are] ready to play our part.”

The wind drought comes about eight years after British politicians vowed to reduce the UK's dependence on fossil fuels. Last year was the first year that electricity generated from low-carbon energy sources like solar power, wind power, and nuclear power outpaced high-carbon energy sources like coal and natural gas. This summer’s wind drought may make it difficult to improve on last year’s numbers.

[h/t New Scientist]

Why Does the Sky Look Green Before a Tornado?

iStock
iStock

A common bit of folklore from tornado-prone parts of the U.S. says that when the skies start taking on an emerald hue, it's time to run inside. But why do tornadoes tend to spawn green skies in the first place? As SciShow's Michael Aranda explains, the answer has to do with the way water droplets reflect the colors of the light spectrum.

During the day, the sky is usually blue because the shorter, bluer end of the light spectrum bounces off air molecules better than than redder, longer-wavelength light. Conditions change during the sunset (and sunrise), when sunlight has to travel through more air, and when storms are forming, which means there are more water droplets around.

Tornadoes forming later in the day, around sunset, do a great job of reflecting the green part of the light spectrum that's usually hidden in a sunset because of the water droplets in the clouds, which bounce green light into our eyes. But that doesn't necessarily mean a twister is coming—it could just mean a lot of rain is in the forecast. Either way, heading inside is probably a good idea.

For the full details on how water and light conspire to turn the sky green before a storm, check out the SciShow video below.

SECTIONS

arrow
LIVE SMARTER
More from mental floss studios