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   Steve Herman (w7voa@journa.host)'s status on Saturday, 11-May-2024 00:34:40 JST Steve Herman

   This is the first G4 severe level geomagnetic alert issued since 2005 with the coronal mass ejection arrival as early as this evening US evening time, NOAA's Shawn Dahl tells reporters on a conference call.

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     Steve Herman (w7voa@journa.host)'s status on Saturday, 11-May-2024 00:34:38 JST Steve Herman

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     Current big sunspot group, 16 times the diameter of Earth, is the "largest seen in some time," according to NOAA.

     tinydoctor repeated this.
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     Steve Herman (w7voa@journa.host)'s status on Saturday, 11-May-2024 00:34:38 JST Steve Herman

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     If G4 event is post-midnight the aurora could be seen as far south as Alabama and northern California.

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     Steve Herman (w7voa@journa.host)'s status on Saturday, 11-May-2024 00:34:39 JST Steve Herman

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     Operators of North America power grid should have ample time "to adequately prepare" to help mitigate and control any developing problems, explains NOAA's Dahl. Worse possible situation would be a "Carrington Event" but "we're not anticipating that."

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     Steve Herman (w7voa@journa.host)'s status on Saturday, 11-May-2024 00:34:39 JST Steve Herman

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     Orientation of the CME in relationship to the magnetic field will determine the severity of the geomagnetic storm, according to NOAA scientists.

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     Steve Herman (w7voa@journa.host)'s status on Saturday, 11-May-2024 00:34:40 JST Steve Herman

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     Warning also just issued for a solar radiation storm at the S1 level with potential for a stronger event, adds NOAA's Dahl.