A free map of every bolt on Earth, seconds after it flashes — centered on your home.
Flying you to the most active storm on Earth right now. Every dot is a real bolt, seconds old — white when it lands, ember-red as it cools.
Every strike sends out a ring growing at the real speed of sound. When a ring crosses your house, that's the exact moment you hear the rumble. Turn sound on and the map plays it too — close strikes crack, far ones roll.
Curious how volunteers find every bolt with radio and a stopwatch? Read how it works.The big glowing bolt is STORM. One press flies you to the most active storm on Earth right now; press again to hop to the next. Somewhere, it is always storming.
The iOS app adds official National Weather Service storm warnings as push notifications — US only, even with the app closed — and a minute-by-minute strip of when rain starts and stops at your house over the next hour.
Join the free TestFlight beta.Downstrike is a father–son project by Leo and Noah Zimmerman, built with help from Claude. It's the lightning map we wanted to watch from our own window — free, no accounts, no ads, and it stays that way. The strikes come from Blitzortung.org, volunteers around the world listening for lightning with antennas in their backyards.