France Investigates Weather Data Tampering Amid Polymarket Betting Surge

France's weather forecasting office, Meteo France, has initiated an investigation into suspected tampering with weather sensors at Charles de Gaulle International Airport. This inquiry was prompted by anomalous temperature readings that coincided with heightened betting activity on Polymarket, a prominent prediction market.

Unusual Temperature Readings Detected

On April 6 and April 15, 2023, temperatures recorded at the airport surged unexpectedly, reaching spikes of 4°C and 5°C, respectively. These anomalies resulted in the highest temperature readings at the site on those dates. Such data is crucial for the safe operations of the airport and significantly impacts betting outcomes on Polymarket.

Surge in Betting on Polymarket

The unusual weather data coincided with approximately $1.4 million in bets on temperature contracts related to Paris. This betting volume was more than double the typical levels for daily Paris temperature contracts during that month.

• April 6: Temperature spike of 4°C

• April 15: Temperature spike of 5°C

• Combined betting reached $1.4 million

Investigation and Responses

Following the data anomalies, Meteo France technicians conducted an examination of the sensor data and the weather station itself. Subsequently, a formal complaint about possible tampering was filed with the airport police. However, specifics regarding the case remain undisclosed as both the airport authorities and law enforcement have declined to comment further.

The investigation's scrutiny comes at a time when prediction markets like Polymarket and Kalshi Inc. have attracted significant attention. While supporters argue these markets enhance information and forecasting accuracy, critics express concerns about their potential for manipulation and other unethical practices.

Impact on Aviation Operations

Meteorologist Ruben Hallali, CEO of HD Rain, highlighted the serious implications of inaccurate weather data for aviation safety. He noted that the temperature readings are critical for pilots and air traffic controllers, affecting takeoffs, landings, and overall flight safety.

Hallali was one of the first to flag the unusual data to Meteo France. He pointed out that on April 15, temperatures fluctuated drastically, causing concerns among meteorologists and traders alike.

Transition in Data Sources

As of April 19, Polymarket announced a shift to using weather data collected from Paris-Le Bourget Airport instead of Charles de Gaulle, likely as a precaution amid the ongoing investigation.

The integrity of weather data remains paramount, and any tampering could have dangerous repercussions within the aviation sector. The investigation continues as authorities seek to uncover the truth behind the reported data anomalies.