The National Weather Service (N.W.S.) launches two weather balloons each day, separated by 12 hours. I took these photos at 6 a.m. this morning. The next launch is presumably at 6 p.m.
If you ever come across a weather balloon on the ground when you’re out walking, follow the instructions to send it back to the N.W.S., since they reuse some of the equipment. Furthermore, this “kidscorner” article on the N.W.S.’s website states, “The balloon flights last for around 2 hours, can drift as far as 125 miles away, and rise up to over 100,000 ft. (about 20 miles) in the atmosphere!”
These photos were taken at the N.W.S. forecast office in the Twin Cities/Chanhassen, Minnesota.