New — the water platform
Water data that answers questions
Type what you want to know about streamflow, groundwater, snowpack or drought. You get an answer in seconds, built from the federal and state record. Every number shows its source.
Instruments
The atmosphere, measured
Flight-proven radiosondes, sensor breakouts and ground-station hardware — built and calibrated here, with the software to fly them.
Free & open — the balloon archive
Where the little balloons go
A party-balloon-sized craft with a solar tracker can stay up for months and lap the planet. The archive keeps the record of every one of those flights, and shows you the ones in the air right now.
Start a conversation
Have an atmosphere problem?
Instruments, modeling, or a full measurement campaign — tell us what you're trying to learn and we'll scope it with you.