Nearly 1,800 weather balloons are launched across the world on any given day. As the balloon goes up it expands and pops at an altitude up to 33 Km (110K feet) above the earth.The flight payload is called a radiosonde. It measures pressure, temperature, relative humidity, position, and velocity during its flight, and transmits the data to a sounding receiver. One or two missing weather balloons won't impact the daily forecast. However, many missing balloons could lead to errors in weather models and forecasts. Weather balloons are also important for gathering weather data for satellite launches and human spaceflights, as launches are often delayed or scrubbed due to upper-level wind shear. In this talk, I present a simulation framework for the most popular radiosonde model. It enables an attacker to generate radiosonde messages or alter logged messages for retransmission. I also present simulations of a jamming attack and a spoofing attack on a sounding receiver: During a jamming attack, the receiver is unable to receive transmissions from active radiosondes. During a spoofing attack, the transmitter sends fake radiosonde messages to a target receiver, identifying as an active radiosonde. I'll talk about the shortcomings of the military variant of the radiosonde model and suggest a simple way to cope with spoofing attacks. REFERENCES: Vredenbregt L., "How many weather balloons are out there? Hundreds, it turns out", https://abcnews.go.com/Politics/weat...ry?id=97082985, Feb 13, 2023. Dudley I., "Weather balloons and rocket science", https://www.vandenberg.spaceforce.mi...ocket-science/ bazjo, "RS41 Decoding", https://github.com/bazjo/RS41_Decoding rs1729, "RS", https://github.com/rs1729/RS projecthorus, "radiosonde_auto_rx", https://github.com/projecthorus/radiosonde_auto_rx sondehub, https://github.com/projecthorus/radiosonde_auto_rx "Upper-air Observations Program", https://www.weather.gov/upperair/ Mass C., "Wind Shear: When the Atmospheric Seems to be Tearing Itself Apart", https://cliffmass.blogspot.com/2017/...ems-to-be.html Jessop M., "Top Radiosonde types", https://twitter.com/vk5qi/status/1170215238978830339 Lada B., "3 weather obstacles that SpaceX faces when launching rockets into space", https://www.accuweather.com/en/space...-launch/352407 Nasa, "Falcon 9 Crew Dragon Launch Weather Criteria", FS-2020-05-568-KSC, www.nasa.gov Frielingsdorf J., "An Open-Source Documentation and Implementation of the Vaisala RS41 Data Preparation Algorithms", WMO Technical Conference on Meteorological and Environmental Instruments and Methods of Observation, Oct. 11, 2022 Cadence PCB Solutions, "What is Signal to Noise Ratio and How to calculate it?", https://resources.pcb.cadence.com/bl...o-calculate-it Vaisala, "Vaisala Radiosonde RS41-SGP Data Sheet", www.vaisala.com, B211444EN-E, 2017 Vaisala, "Vaisala Radiosonde RS41-SG Data Sheet", www.vaisala.com, B211321EN-K, 2020 Vaisala, "Vaisala Radiosonde RS41-SGM Data Sheet", www.vaisala.com, B211448EN-E, 2017