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

Video US, Japan Offer Lessons as Eurozone Launches Huge Stimulus

Euro falls after European Central Bank announces a bigger-than-expected $67 billion-a-month quantitative easing program More

Saudi King’s Death Clears Succession Route

Prince Mohammed Bin Nayef is Saudi Arabia's New Crown Prince-in-waiting More

Cloud Hangs Over US Counterterrorism Efforts in Yemen

Sources say resignations of Yemen's president, government has left US anti-terror operations 'paralyzed,' yet an American military 'footprint' remains 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.
Worldwide Photo Workshops Empower Youthi
X
Julie Taboh
January 23, 2015 11:08 PM
Last September, 20 young adults from South Sudan took part in a National Geographic Photo Camp. They are among hundreds of students from around the world who have learned how to use a camera to tell the stories of the people in their communities through the powerful medium of photography. Three camp participants talked about their experiences recently on a visit to Washington. VOA’s Julie Taboh reports.
Video

Video Worldwide Photo Workshops Empower Youth

Last September, 20 young adults from South Sudan took part in a National Geographic Photo Camp. They are among hundreds of students from around the world who have learned how to use a camera to tell the stories of the people in their communities through the powerful medium of photography. Three camp participants talked about their experiences recently on a visit to Washington. VOA’s Julie Taboh reports.
Video

Video US, Japan Offer Lessons as Eurozone Launches Huge Stimulus

The Euro currency has fallen sharply after the European Central Bank announced a bigger-than-expected $67 billion-a-month quantitative easing program Thursday - commonly seen as a form of printing new money. Henry Ridgwell reports for VOA from London on whether the move might rescue the eurozone economy -- and what lessons have been learned from similar programs around the world.
Video

Video Nigerian Elections Pose Concern of Potential Conflict in 'Middle Belt'

Nigeria’s north-central state of Kaduna has long been the site of fighting between Muslims and Christians as well as between people of different ethnic groups. As the February elections approach, community and religious leaders are making plans they hope will keep the streets calm after results are announced. Chris Stein reports from the state capital, Kaduna.
Video

Video As Viewership Drops, Obama Puts His Message on YouTube

Ratings reports show President Obama’s State of the Union address this week drew the lowest number of viewers for this annual speech in 15 years. White House officials anticipated this, and the president has decided to take a non-traditional approach to getting his message out. VOA White House correspondent Luis Ramirez reports.
Video

Video S. Korean Businesses Want to End Trade Restrictions With North

Business leaders in South Korea are calling for President Park Geun-hye to ease trade restrictions with North Korea that were put in place in 2010 after the sinking of a South Korean warship.Pro-business groups argue that expanding trade and investment is not only good for business, it is also good for long-term regional peace and security. VOA’s Brian Padden reports.
Video

Video US Marching Bands Grow Into a Show of Their Own

The 2014 Super Bowl halftime show was the most-watched in history - attracting an estimated 115 million viewers. That event featured pop star Bruno Mars. But the halftime show tradition started with marching bands, which still dominate the entertainment at U.S. high school and college American football games. But as Enming Liu reports in this story narrated by Adrianna Zhang, marching bands have grown into a show of their own.
Video

Video Secular, Religious Kurds Face Off in Southeast Turkey

Turkey’s predominantly Kurdish southeast has been rocked by violence between religious and secular Kurds. Dorian Jones reports on the reasons behind the stand-off from the region's main city of Diyarbakir, which suffered the bloodiest fighting.
Video

Video Kenya: Misuse of Antibiotics Leading to Resistance by Immune System

In Kenya, the rise of drug resistant bacteria could reverse the gains made by medical science over diseases that were once treatable. Kenyans could be at risk of fatalities as a result if the power in antibiotics is not preserved. Lenny Ruvaga has more on the story from Nairobi.
Video

Video Solar-Powered Plane Getting Ready to Circumnavigate Globe

Pilots of the solar plane that already set records flying without a drop of fuel are close to making their first attempt to fly the craft around the globe. They plan to do it in 25 flying days over a five month period. VOA’s George Putic reports.
Video

Video How Experts Decide Ethiopia Has the Best Coffee

Ethiopia’s coffee has been ranked as the best in the world by an international group of coffee connoisseurs. Not surprisingly, coffee is a top export for the country. But at home it is a source of pride. Marthe van der Wolf in Addis Ababa decided to find out what makes the bean and brew so special and how experts make their determinations.
Video

Video Yazidi Refugees at Center of Political Fight Between Turkey, Kurds

The treatment of thousands of Yazidis refugees who fled to Turkey to escape attacks by Islamic State militants has become the center of a dispute between the Turkish government and the country's pro-Kurdish movement. VOA's Dorian Jones reports.
Video

Video World’s Richest 1% Forecast to Own More Than Half of Global Wealth

The combined wealth of the world's richest 1 percent will overtake that of the remaining 99 percent at some point in 2016, according to the anti-poverty charity Oxfam. Campaigners are demanding that policymakers take action to address the widening gap between the ‘haves’ and the ‘have nots’, as Henry Ridgwell reports for VOA from London.

Circumventing Censorship

An Internet Primer for Healthy Web Habits

As surveillance and censoring technologies advance, so, too, do new tools for your computer or mobile device that help protect your privacy and break through Internet censorship.
More

All About America

AppleAndroid