Geomagnetic Storms
Kp / G-Scale · Live Alerts
NOAA G-scale classification with the planetary Kp index and active storm alerts.
Kp Index
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G-Scale
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Peak Kp (3d)
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Active Alerts
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Kp · Last 7 days
NOAA planetary K-index, 3-hour cadence
Active NOAA alerts
NOAA G-Scale reference
G1
Minor
Weak power grid fluctuations. Aurora at high latitudes.
Kp 5
G2
Moderate
High-latitude power systems alarms. Aurora to New York.
Kp 6
G3
Strong
Voltage corrections required. Aurora to Illinois/Oregon.
Kp 7
G4
Severe
Widespread voltage problems. Aurora as far south as Alabama.
Kp 8
G5
Extreme
Grid collapse possible. Aurora visible near equator.
Kp 9