These balloons carry weather instruments that measure temperature, humidity and wind speed (among other atmospheric properties).

When fine-tuning a forecast, weather balloons provide data about what’s going on in the atmosphere to help provide more accurate forecast models.

The balloons soar 100,000 feet in the air with sensors called radiosondes hanging about 20 feet below them that measure temperature, dew point, humidity, barometric pressure, wind speed and direction.

The balloons soar 100,000 feet in the air with sensors called radiosondes hanging about 20 feet below them that measure temperature, dew point, humidity, barometric pressure, wind speed and direction.

The balloons soar 100,000 feet in the air with sensors called radiosondes hanging about 20 feet below them that measure temperature, dew point, humidity, barometric pressure, wind speed and direction.

The balloons soar 100,000 feet in the air with sensors called radiosondes hanging about 20 feet below them that measure temperature, dew point, humidity, barometric pressure, wind speed and direction.

The balloons soar 100,000 feet in the air with sensors called radiosondes hanging about 20 feet below them that measure temperature, dew point, humidity, barometric pressure, wind speed and direction.

The balloons soar 100,000 feet in the air with sensors called radiosondes hanging about 20 feet below them that measure temperature, dew point, humidity, barometric pressure, wind speed and direction.

The balloons soar 100,000 feet in the air with sensors called radiosondes hanging about 20 feet below them that measure temperature, dew point, humidity, barometric pressure, wind speed and direction.

The balloons soar 100,000 feet in the air with sensors called radiosondes hanging about 20 feet below them that measure temperature, dew point, humidity, barometric pressure, wind speed and direction.

The balloons soar 100,000 feet in the air with sensors called radiosondes hanging about 20 feet below them that measure temperature, dew point, humidity, barometric pressure, wind speed and direction.