In plain words no jargon; hover or tap any dotted word for what it means
Reading NOAA…
Now
Near the magnetic equator (Guyana and Brazil, West Africa, India, South-East Asia) GNSS can scintillate for a few hours after local sunset even when Kp is quiet. That is the ionosphere, not a storm, and Kp does not show it.
Kp, last two days and next three 3-hour blocks, UTC
Behind it the drivers, live
NOAA alerts, last 48 hours all alerts ↗
The words, in plain English every dotted word above, explained
Where it comes from
Kp, storm scales, solar wind, flare chances and alerts are read live in your browser from the NOAA Space Weather Prediction Center. The satellites themselves, and which are in service, are on Constellations.
What it is not
Not a forecast of your own receiver, and blind to jamming and spoofing: a transmitter near the vessel overrides everything here, however quiet the sky. Kp is one planet-wide number every three hours; what reaches a given antenna depends on latitude, local time and the kit. Watch your own DGNSS residuals and use the official broadcast at sea.
Why it matters at sea
Every position offshore hangs off GNSS and its corrections, and HF is still the backup voice link. A storm shows first in the residuals and the magnetometer. Pair it with the GNSS jamming notices on Wide Berth.