Fall and winter walks across meadows, fields, and woods are increasingly ending with a surprising discovery. Walkers across the country are finding small, white boxes made of styrofoam or plastic in the grass or hanging from tree branches. These strange objects typically feature a long antenna and remnants of a burst balloon sticking out. Although many people’s first reaction is concern that it might be military equipment, these objects are actually harmless weather radiosondes.
Understanding these devices helps demystify the finds. A styrofoam box with an antenna found in a field is a disposable measuring instrument launched into the atmosphere by weather services and meteorological agencies. Attached to a large balloon filled with hydrogen or helium, the probe ascends to an altitude of over 18 miles. During its flight, it measures temperature, humidity, pressure, and wind speed, transmitting the data via radio signals.
When the balloon bursts in the thin upper air, the device descends to the ground on a small parachute or the remnants of the balloon envelope, often landing hundreds of miles from its original launch site. The equipment generally includes a radio transmitter, sensors, a battery, and a GPS module. The total cost for a meteorological agency to purchase a new unit ranges from $200 to $375.
Is a Found Radiosonde Dangerous?
A common mistake among walkers is fearing to touch the box due to concerns over radiation or explosives. However, a radiosonde is completely safe to handle and contains no hazardous chemicals or radioactive materials. The first step after finding the device is to check the label on the casing. It often includes an explanation in English or other languages stating that it is a harmless meteorological instrument.
According to manufacturer instructions, once you find a probe, you should switch off its power if it has a switch, cut away the remnants of the parachute and cord, and either drop the device into an e-waste bin or take it home.
What You Should Never Do With a Found Radiosonde
Several myths surround landed probes, and careless actions at the site can cause unnecessary problems. Keep these fundamental rules in mind:
- Never touch a probe hanging from overhead power lines: This carries a fatal risk of electrocution. Knocking it down with poles or climbing utility poles is strictly prohibited.
- Do not leave balloon scraps behind: Synthetic materials and latex remnants can become deadly traps for wildlife if left behind in woods and fields.
- Do not throw units with lithium batteries into regular trash: Batteries can ignite inside a garbage truck.
- Do not trample farm crops: Respect the property of landowners whose ground you are crossing during your search.
Reward, Market Value, and Recycling Options
Enthusiasts of meteorology and radio monitoring organize “radiosonde hunts,” using GPS signals to precisely locate fallen boxes. Recovered equipment generally does not need to be returned to weather agencies, as weather services do not buy back used probes. They treat them as single-use items, though some foreign stations issue commemorative certificates.
Selling a working probe on online marketplaces brings in about $12 to $30 on the secondary market, where they are bought by ham radio operators and electronics hobbyists. Alternatively, the cost of disposing of a damaged probe at a local recycling center is $0, as they are accepted as electronic waste. Responsible disposal protects the environment, as carelessly tossing batteries into the woods is harmful.
Frequently Asked Questions
What should you do after finding a radiosonde?
Check the label, and if the device has a switch, turn off the power. Also collect the remnants of the balloon, parachute, and cords, and either take the sonde to an e-waste collection site or bring it home.
What shouldn’t you do with a radiosonde you find?
Do not knock it down from power lines or climb utility poles. Do not leave balloon debris outdoors, do not throw a sonde with lithium batteries into regular household trash, and do not damage crops while searching.
Can you keep a radiosonde you find?
Once it has completed its measurement function, a radiosonde can be kept as a souvenir or sent for recycling. Before taking it from fenced private property, you must obtain permission from the owner.
Is a radiosonde hazardous to health?
No, a radiosonde is safe and contains no radioactive materials or hazardous chemical substances. However, you should never touch a device caught in power lines due to electrocution risks.
What is the white box with an antenna found in a field or forest?
It is a weather radiosonde-a single-use measuring device launched on a weather balloon by meteorological services to measure temperature, humidity, pressure, and wind speed.
How much can you get for a radiosonde you find?
Weather services do not buy back used sondes. However, a functioning device can fetch around $12 to $30 on the secondary market when sold to radio hobbyists and electronics enthusiasts.
