1. Decreasing Air Temperature: The temperature in the troposphere decreases with increasing altitude at an average rate of approximately 6.4°C per 1000 meters (3.5°F per 1000 feet). This is known as the environmental lapse rate. As a result, the weather instruments on the rising balloon will record a gradual drop in air temperature with altitude.

2. Decreasing Air Density: Air density decreases as the altitude increases. The air at higher altitudes is less dense because there is less mass of air pressing down on it. The weather instruments on the balloon will indicate a decrease in air density as it ascends.

3. Decreasing Air Pressure: Atmospheric pressure is the weight of the air above a given point. As the balloon moves upward and encounters less air mass above it, the air pressure will decrease. The weather instruments will record a gradual reduction in air pressure with increasing altitude.

4. Increasing Relative Humidity: The relative humidity (RH) of the air generally tends to increase with altitude in the troposphere. This occurs because the temperature decreases with altitude, which allows water to vapor condense into tiny droplets, resulting in higher relative humidity.

5. Wind Changes: As the balloon rises, it encounters different wind directions and speeds at various altitudes. The weather instruments on the balloon can measure shifts in wind direction and monitor wind speed variations with altitude.

6. Cloud Formations: The balloon may pass through different cloud layers as it rises through the troposphere. The weather instruments can provide information on cloud types, cloud heights, and cloud coverage.

7. Solar Radiation: The intensity of solar radiation increases with altitude in the troposphere due to the reduced air mass and decreased absorption of sunlight. The weather instruments can measure solar radiation levels at various altitudes.