How to Read an Aurora Forecast — Aurora Guide
How to Read an Aurora Forecast
Here's what a real aurora forecast looks like — and what each number means for your evening.
Bz–8 nT (South ✓)→ Strong, active aurora likely
Kp-Index5 (active storm)→ Visible from northern US
Solar Wind Speed550 km/s→ Good energy, about 45 min away
🎉 Get outside tonight if you're in Canada, Alaska, Iceland, or Scandinavia!
⚠️ What if Bz is north (+) but Kp is high?
Aurora can still occur — but it'll be weaker and less dynamic than if Bz were south. A Kp 7 with Bz +3 nT may still be visible, just less dramatic. Wait for Bz to flip south for the best show.
⚡ What if Bz south but Kp is 0–1?
The shield is open but the storm is weak. Some faint aurora may be visible inside the Arctic Circle. Not a great show — you need both Bz south and decent Kp for something memorable.
Check tonight's aurora forecast