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https://spaceweather.com/glossary/geostorm.html

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4  <TITLE>Geomagnetic Storms</TITLE>
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8<P><FONT SIZE="+2" FACE="Courier New">Geomagnetic Storm Forecasts</FONT></P>
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10<P><FONT FACE="Courier New">The geomagnetic storm probabilities
11are the estimated chances of at least one 3-hour K index, at the
12indicated level, for each of the next 3 days.<BR>
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14Active: K = 4.<BR>
15Minor storm: K = 5.<BR>
16Major or Severe storm: K &gt; 6.</FONT></P>
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18<P><FONT FACE="Courier New">The &quot;<A HREF="kp.html">K index</A>&quot;
19is a 3-hourly quasi-logarithmic local index of geomagnetic activity
20relative to an assumed quiet-day curve for the recording site.
21Range is from 0 to 9. The K index measures the deviation of the
22most disturbed horizontal component of the magnetic field.</FONT></P>
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24<P><FONT FACE="Courier New">Back to <A HREF="http://www.spaceweather.com/">spaceweather.com</A></FONT>
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