News / Science & Technology

Doppler on Wheels Rolls Into Tornados

Doppler on Wheels Rolls Into Tornadosi
X
August 02, 2013 2:06 PM
Forecasters now are able to predict bad weather better than ever with a modern set of tools, including satellite data, high altitude balloons, radar stations and computer models. But for tornados, the false alarm rate has hovered about 75 percent for decades. As VOA’s Rosanne Skirble reports, a team of scientists at the Center for Severe Weather Research in Boulder, Colorado is working to improve forecasts by studying how monster storms form.
Doppler on Wheels Rolls Into Tornados
Rosanne Skirble
A team of scientists in Boulder, Colorado, is working to improve forecasts by studying how monster storms form up close.
 
Doppler radar reads the weather based on reflections from items moving through the air. Joshua Wurman was the first to put the technology on wheels and drive it directly into the path of a tornado.

“I invented Doppler on Wheels in the 1990s because I was frustrated that I couldn’t see enough detail inside tornados and hurricanes," Wurman said. "We had blurry images of all these things and in order to really understand the physics, the math of what is going on inside a tornado, how exactly are they forming, how strong are the winds right at the surface are, we need to get up very, very, close."

Storm Chaser

Wurman, who directs the Center for Severe Weather Research, deploys Doppler on Wheels to chase storms. His fleet consists of large panel trucks with rotating antenna dishes mounted on the back.
Dopplar on Wheels Rolls Into Tornados
Doppler on Wheels Rolls Into Tornadosi
|| 0:00:00
...    
🔇
X

Those high-powered antennas send out radio waves that reflect objects in the air from raindrops to birds. Wurman and his team watch the weather patterns in real time from inside the truck.
Dr. Karen Kosiba monitors the status of the radar in preparation for the day's scientific mission. (Photo by Jim Reed)Dr. Karen Kosiba monitors the status of the radar in preparation for the day's scientific mission. (Photo by Jim Reed)
x
Dr. Karen Kosiba monitors the status of the radar in preparation for the day's scientific mission. (Photo by Jim Reed)
Dr. Karen Kosiba monitors the status of the radar in preparation for the day's scientific mission. (Photo by Jim Reed)
“I’m seeing it through computers and through the radar screens, which are making three dimensional images of the wind and the debris and the hail, flowing around the storm,” Wurman said.

Weather forecasts, based on data from satellites, fixed radar networks and computer models, help guide the trucks to the precise location of a storm that could spawn a tornado. Doppler on Wheels has driven into more than 200 tornados so far.

“When we get up close to a storm while it’s in the process of making a tornado, we can look at the evolution of the winds near the surface, how that relates to the winds aloft, how the precipitation, the rain and the hail, influences whether the air is going up or down, whether it’s cold or warm, and how that is causing or not causing a tornado to form,” Wurman said.

Lifecycle of tornados

The analysis combines the Doppler images and 3D maps with data from steel weather pods, large heavy metal discs with measuring instruments. The pods are placed in the path of a storm to collect data from the ground, below the range of the radar.

A Nebraska field with lightning in the background. (Photo by Gino DeGrandis)A Nebraska field with lightning in the background. (Photo by Gino DeGrandis)
“That’s where we live. We live right near the ground," Wurman said. "Buildings are built right on the ground and we need to understand more about how the winds do damage, how the debris field interacts with the winds and does damage.”  

That data could lead to better building design in storm prone areas.  

As they observe the life cycle of tornados, scientists are getting a better understanding of which storms develop into tornados and which die away.  One factor revealed by the radar is a secondary wind surge that Wurman says could trigger the tornado.  

“The scientific process is that we need to now observe that and repeat that observation in maybe a dozen or more other thunderstorms, and in maybe a dozen or more thunderstorms that aren’t making tornados, to really see if that surge causes tornados and if there is no surge, whether there is no tornado,” he said.

Mobile scientific laboratory

Doppler on Wheels is an advanced mobile scientific laboratory. Along with hundreds of twisters, it has also chased several hurricanes, expanding what we know about those storms.

Positioned on the Louisiana coast for Hurricane Gustav in 2008, the fleet captured high resolution measurements as the hurricane came ashore. The images show winds in surprising corkscrew rolls.
Doppler on Wheels 7 samples a severe thunderstorm in western Nebraska. (Photo by Tim Marshall, 2010)Doppler on Wheels 7 samples a severe thunderstorm in western Nebraska. (Photo by Tim Marshall, 2010)
“And that corkscrewing motion does two things," Wurman said. "One, it brings strong winds down to the surface and those stronger winds have a much greater potential to cause damage. But in addition, on the way back up, those winds are carrying heat and moisture from the ocean, which is basically the food, the fuel for a hurricane.”

For tornados, the false alarm forecast rate has hovered around 75 percent for decades. Looking at those winds could give forecasters a better idea of the intensity of the storm, which could translate into more accurate forecasts.  And that, Wurman says, can save lives.

You May Like

Obama: I Will Do 'Everything I Can' to Close Guantanamo

US president says prison continues 'to inspire jihadists and extremists around the world' More

Sierra Leone Educates on Safe Ebola Burials

Also, country is improving at rapid response to isolated outbreaks, but health workers need to be even faster, officials say More

Religion Aside, Christmas Gains Popularity in Communist Vietnam

Increasingly wealthy Vietnamese embrace holiday due to its non-religious glamor, commercial appeal More

This forum has been closed.
Comments
     
There are no comments in this forum. Be first and add one

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
US Decision on Cuba Underscores Divisions Among Miami Cubansi
X
Sharon Behn
December 19, 2014 9:34 PM
For decades, older, more conservative Cubans have been gathering at Café Versailles on the corner of Calle Ocho to eat Cuban food and talk politics. After hearing of President Barack Obama’s decision, a number of them gathered in front of the café with posters to protest. VOA's Sharon Behn reports on the situation.
Video

Video US Decision on Cuba Underscores Divisions Among Miami Cubans

For decades, older, more conservative Cubans have been gathering at Café Versailles on the corner of Calle Ocho to eat Cuban food and talk politics. After hearing of President Barack Obama’s decision, a number of them gathered in front of the café with posters to protest. VOA's Sharon Behn reports on the situation.
Video

Video Three Cities Bid for Future Obama Presidential Library

President Barack Obama still has two years left in his term in office, but the effort to establish his post-presidential library is already underway. The bid for the Obama Presidential Library is down to four locations in three states -- New York, Hawaii, and Illinois. As VOA’s Kane Farabaugh reports, each of them played an important part in the president’s life before he reached the White House.
Video

Video Cuba Deal is Major Victory for Pope’s Diplomatic Initiatives

Pope Francis played a key role in brokering the US-Cuba deal that was made public earlier this week. It is the most stunning success so far in a series of peacemaking efforts by the pontiff. VOA religion reporter Jerome Socolovsky has more.
Video

Video Fears of More Political Gridlock in 2015

2014 proved to be a difficult year politically for President Barack Obama and a very good year for the U.S. Republican Party. Republican gains in the November midterm elections gave them control of the Senate and House of Representatives for the next two years -- setting the stage for more confrontation and gridlock in the final two years of the Obama presidency. VOA National Correspondent Jim Malone has a preview from Washington.
Video

Video Sudan School Becomes Target of Aerial Attacks

The school dropout rate is at an all-time high in Sudan's South Kordofan state because many schools have been destroyed during the three-year civil war between the government and SPLA-N rebel forces. Adam Bailes visited Sudan's Nuba Mountains' region and reports many children are simply too scared to go to school
Video

Video VOA Reporter Tours Devastated Peshawar School

Islamist militants wearing military uniforms and strapped with explosives attacked a military run school Tuesday in the northwestern Pakistani city of Peshawar. At least 141 people were killed in the horrific attack, most of them young students. VOA reporter Ayaz Gul visited the devastated school and attended the funeral of the principal who courageously tried to save her students from the deadly attack.
Video

Video Nigerians Fleeing Boko Haram Languish in Camp Near Capital

In its five-year effort to impose Islamic law in northeastern Nigeria, the Boko Haram extremist group has killed thousands of people and forced hundreds of thousands to flee. Some of those who ran for their lives now live in squalor on the edges of the capital, Abuja. Chris Stein reports for VOA.
Video

Video Aceh Rebuilt Decade After Tsunami, But Scars Remain

On December 26, 2004 there was an earthquake in the Indian Ocean so powerful it caused the Earth’s axis to wobble a few centimeters. Onshore on the island of Sumatra, the resulting tsunami was devastating. A decade later, VOA Correspondent Steve Herman reports from Banda Aceh, Indonesia, where although there is little remaining evidence of the physical devastation, the psychological scars among survivors remain.

All About America

AppleAndroid