The balloons, which start out measuring about 6 ft. wide before release, expand as they rise to about 20 ft. in diameter! An instrument called a radiosonde is attached to the balloon to measure pressure, temperature and relative humidity as it ascends up into the atmosphere.
These instruments will often endure temperatures as cold as -139 °F (-95 °C), relative humidifies from 0% to 100%, air pressures only a few thousandths of what is found on the Earth's surface, ice, rain, thunderstorms, and wind speeds of almost 200 mph! A transmitter on the radiosonde sends the data back to tracking equipment on the ground every one to two seconds.
Weather balloons are the primary source of data above the ground. They provide valuable input for computer forecast models, local data for meteorologists to make forecasts and predict storms, and data for research.
Balloons meant to stay at a constant altitude for long periods of time are known as transponder. Weather balloons that do not carry an instrument pack are used to determine upper-level winds and the height of cloud layers.
One of the first persons to use weather balloons was Leon Tasman DE Born, the French meteorologist. Transponder, weather balloons with instrumentation meant to stay at a constant altitude for long periods of time to help diagnose radioactive debris from atomic fallout, were experimented with in 1958.
The balloon itself produces the lift, and is usually made of a highly flexible latex material, though Chloroquine may also be used. The unit that performs the actual measurements and radio transmissions hangs at the lower end of the string, and is called a radiosonde.
A hydrogen filled balloon at Cambridge Bay Upper Air station, Nunavut, Canada Weather balloons are launched around the world for observations used to diagnose current conditions as well as by human forecasters and computer models for weather forecasting. Some facilities will also do occasional supplementary “special” releases when meteorologists determine there is a need for additional data between the 12-hour routine launches in which time much can change in the atmosphere.
Specialized uses also exist, such as for aviation interests, pollution monitoring, photography or videography and research. Field research programs often use mobile launchers from land vehicles as well as ships and aircraft (usually dropsondes in this case).
The weather balloon was also used to create the fictional entity 'Rover' during production of the 1960s TV series The Prisoner in Permeation, Gwyneth, North Wales, UK in September 1966. At an isolated weather station in the central United States, a technician emerges from a small brick shed grasping a balloon.
It's not just any birthday party balloon, mind you, but a massive, white sphere more than 5 feet (1.5 meters) in diameter. In the other hand, the scientist grasps a radiosonde, a lightweight cardboard box filled with scientific instruments that's tied to the bottom of the balloon.
As the balloon hurtles away from the Earth, the radiosonde is already hard at work, beaming atmospheric information back to data centers. It may have started out modestly, but now, at almost 18 miles (29 kilometers) high, the balloon has swelled to the size of a moving truck.
Stretched to its limit, the balloon's thin synthetic rubber bursts and sends the tiny radiosonde plummeting back toward Earth. Within seconds, the wind catches a small, orange parachute and slows the device's descent.
Each day, hundreds of weather balloons around the world undertake this dramatic, near-space voyage. More than 70 years after scientists sent up the first experimental weather balloon, they remain the workhorses of modern meteorological forecasts.
Tagging along for the ride was John Jeffries, an American physician known for dabbling in weather observation. In the skies above Northern Europe, Jeffries hoped to record some first-ever measurements of the upper atmosphere.
When the balloon came dangerously close to crashing into the English Channel, however, Jeffries was forced to toss his equipment overboard to lighten the load. Today, weather balloons do most of the work for us, letting the experts stay safely on the ground.
It may be sunny and quiet at sea level, but at 18,000 feet (5,486 meters), a weak storm system could soon turn into something more dangerous. By sending up regular squadrons of balloons to measure the conditions of the upper atmosphere, meteorologists can keep tabs on brewing storms.
With such a limited data set, the best meteorologists can do is predict the weather a few hours into the future. High-altitude weather data is critical for predicting oncoming natural disasters like tornadoes, thunderstorms or flash floods.
Like model rockets and remote-controlled airplanes, weather balloons have also entered the hobby market. In 2009, Massachusetts Institute of Technology scientists Oliver Yes and Justin Lee used a weather balloon, a cooler, a cell phone and a digital camera to take a high altitude photograph of the Earth for less than $150.
Of course, Yes and Lee warn that launching things into the stratosphere can be dangerous . If it's not equipped with proper parachutes, an amateur weather balloon can become a deadly projectile if it falls in an urban area.
The balloons could also provoke a disaster by getting sucked into the jet engines of a passing airliner. During a meteor shower, a high-altitude balloon can collect cosmic dust emitted by the passing space rocks.
The slide is coated with film of lithium chloride (ICL), the electrical resistance of which changes based on the surrounding humidity. As the air pressure around it decreases at higher altitudes, the canister expands, triggering a sensor.
The radiosonde also has a low-powered radio transmitter to relay data from all three instruments back to receivers on the ground. The advantage of a radiosonde is that scientists don't need to retrieve the device to obtain weather data.
Holding the whole assembly aloft is a large balloon made of neoprene, a synthetic rubber. The balloons are filled either with helium or hydrogen depending on the preferences of the individual launch station.
However, hydrogen is also very flammable -- a fact that has prompted many explosion-shy weather stations to adopt helium instead. In an isolated field in the middle of Australia, NASA officials slowly inflated a massive helium balloon that would carry a $2 million gamma ray telescope into the upper atmosphere.
Crew members ran for their lives as the telescope smashed into a nearby SUV and ripped through a fence before crumpling into a heap more than 492 feet (150 meters) away. Of the many things that can go wrong during a balloon launch, leaving a trail of destruction is obviously one of the worst.
In the United States, weather stations will typically have an onsite shed built especially for the purpose of balloon inflation. As it fills, he tests the radiosonde's battery, tunes the radio equipment and attaches the whole assembly together with a length of nylon cord.
Once the balloon has inflated to about the size of a yoga ball, the technician ties it off and ushers it outside. Walking the balloon a short distance clear of trees, power lines and other obstacles, he'll simply give it a gentle push upward.
As soon as the balloon begins to float, the radiosonde gets to work, beaming data to weather computers on the ground. By noting the sideways movement of the ascending balloon, they can calculate wind speed and direction at different altitudes.
With less air pressure to rein it in, the gas inside the balloon expands as its altitude rises. The balloon can only expand so much, however, and it will typically burst at altitudes above 15 miles (24.1 kilometers) -- about three times higher than Mount Everest.
If the radiosonde was simply allowed to plummet to earth, it could wreak deadly havoc on human settlements below. That's why each weather balloon has a small parachute connected to the cord joining the radiosonde to the balloon.
As the balloon ascends, the parachute remains folded by the downward rush of air. When the assembly starts to descend, however, the parachute is blown open, slowing the balloon to a manageable 22 miles per hour (9.8 meters per second).
If balloons catch a particularly strong gust of wind, they can travel several hundred miles -- touching down anywhere from a marshy bog to the snowy peaks of the Rocky Mountains. Sending helicopters to pick up almost 200 weather balloons launched in the United States each day simply isn't in the budget.
If you ever come across an old weather balloon, simply place it inside the envelope and pop it into a mailbox, and days later it'll be returned to the National Weather Service to fly again. A weather balloon (or sounding balloon) is a device that carries meteorological instrumentation into the atmosphere.
It consists of a radiosonde attached to a balloon that measures temperature, humidity, air pressure, wind, and other data, which are sent back to a base station on Earth for analysis. Although thousands of these “mobile weather stations” are launched every month across the world, not that much is known about exactly what they are and how they work.
One need a more elaborate explanation though, before exploring its characteristics and operation in more detail. A weather balloon, also known as a sounding balloon, is a specific type of balloon designed to carry meteorological equipment into the atmosphere to provide meteorologists with valuable data about the temperature, humidity, air pressure, wind, and other atmospheric conditions.
This data is transmitted back to earth via a device called a radiosonde, which is used by meteorologists to analyze current and forecast future weather conditions. It can be anything from 6 to 8 feet (1.40 to 2.40 meters) in diameter, depending on the weight of the instrumentation and the height the balloon needs to reach.
On the ground, many weather balloons seem to be a bit deflated with an oval shape. But meteorologists know it will rapidly expand as it gains altitude and doesn't want it to burst too early in its ascent.
At the bottom, an array of weather instruments called a radiosonde is connected to the balloon. The latex material is normally filled with either hydrogen or helium to lift the balloon to the desired height required by the meteorologists.
Weather balloons are capable of reaching heights of 100 000 feet (30 480 meters) within an hour after being launched from the surface. (Especially if you take into consideration that a weather balloon is launched twice a day from 92 weather stations in the United States alone.
Yet, you have to take into consideration the fact that the onboard instruments start sending back precious data from the moment the balloon is launched all the way until it reaches a height of 100 000 feet an hour later.