# EXTENDED WARNING: Geomagnetic K-index of 4 expected

EXTENDED WARNING: Geomagnetic K-index of 4 expected

via [NOAA Space Weather Prediction Center (alerts/watches)](https://services.swpc.noaa.gov/products/alerts.json#K04W)

A geomagnetic K-index of 4 is expected, prompting an extended warning from the NOAA Space Weather Prediction Center. This is exciting news for sky-watchers, as it indicates a higher likelihood of visible aurora at high latitudes. Sky-watchers in Canada and Alaska may be able to see aurora, and should look for weak power grid fluctuations as a sign of the geomagnetic activity.

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Canonical: https://darkskiesdirectory.com/nightly-news/2026-09-24/extended-warning-geomagnetic-k-index-of-4-expected