The only aurora forecast that checks the clouds too. We combine the aurora forecast with your local cloud cover, so you're not left guessing whether you'll actually see it.
No daily digest, no spam, just a heads-up when a significant CME is inbound. Unsubscribe anytime.
Seeing the aurora requires enhanced geomagnetic activity and clear sky overhead at your location, so we make sure to check both forecasts.
Tonight's aurora forecast for all 41,000+ U.S. zip codes, plus Canada, the UK, Ireland, Germany, Sweden, Norway, Finland and Iceland.
Space weather and cloud cover, checked together instead of separately, so you're not left reconciling two numbers yourself.
One percentage, not a chart full of numbers you'd have to interpret on your own.
No proprietary weather models, just the same public government sources scientists use.
Every confidence score is built from two independent readings so you can see exactly why tonight looks good, or doesn't.
These are the coronal mass ejections currently modeled as potentially Earth-directed. They're predictions, not certainties, a CME can arrive early, late, weaker than expected, or miss entirely, and the Kp stays at background levels until one actually does.
A guest who misses the aurora because nobody woke them leaves a different review than one who didn't. This watches conditions all night and alerts them the moment their odds are worth getting up for.
It's a probability, not a guarantee. Geomagnetic storm forecasts depend on modeled coronal mass ejections that can arrive late, weaker than predicted, or miss Earth entirely. The confidence score reflects that uncertainty rather than hiding it.
Naked-eye visibility means the aurora should be visible to the eye. Camera-only visibility means a long-exposure camera can pick up aurora activity, usually as a faint reddish or greenish glow, even when it isn't visible to the eye, and it extends noticeably farther from the pole than naked-eye visibility does.
Aurora visibility tracks magnetic latitude, not straight geographic latitude, and the magnetic pole is offset from the geographic pole toward northern Canada. That's why, at the same Kp index, aurora is visible farther south over North America than over Europe at a similar geographic latitude.
The Kp index simply stays at background levels and the elevated forecast quietly doesn't happen. That's a normal outcome of CME forecasting, not an error, which is why confirmed current Kp and CME-dependent outlook are always shown separately.
Yes. Geomagnetic forecasting is global. Cloud forecasts use the National Weather Service inside the United States and a global weather source everywhere else, including Canada, Iceland, Norway, Sweden, Finland, and the UK.
A high Kp index only means the storm is active, not that you'll personally see it. Moon phase, light pollution, cloud cover, and which direction you're facing all matter just as much. See our full guide on how to actually see the aurora for what else has to line up.