The 27-day outlook & solar rotation
The Sun rotates about once every 27 days as seen from Earth. That means a region that fired off a storm can swing back around and do it again roughly four weeks later. NOAA's 27-day outlook uses that recurrence to sketch the weeks ahead.
Live 27-day outlook
How to read it
The outlook lists, for each day, the expected 10.7 cm solar radio flux (a proxy for solar activity), the planetary A-index, and the largest expected Kp. The largest-Kp column is the one to scan: a run of elevated days flags a period worth watching.
What it can't do
It's a tendency, not a schedule. A quiet region can wake up and an active one can fizzle. Use the 27-day outlook to know which weeks to pay attention, then let the 3-day forecast and the live dashboard make the call.
After any big storm we note the recurrence date on updates — "the active region returns around…".