SWPC Forecasters have issued G3 (Strong) Geomagnetic Storm Watches for 04-06 October due to a pair of coronal mass ejections that are anticipated to arrive over the course of the next three UTC days. Stay tuned for updates as we monitor this activity!
Comments
No warnings at NOAA Space Weather Prediction Center.[1]
No warnings on PJM grid dashboard.
Probably not going to be a problem.
[1] https://www.swpc.noaa.gov/
Perhaps you checked a few minutes too soon?
Is a UTC day a different length to a common solar day? At this level of pre soon leap seconds and even sidereal day difference makes no difference
Yes, but they probably mean "the next 72 hours from right now given in UTC".
Or maybe they mean "day" as starting from UTC midnight.
I'd guess that's actually more likely. Interesting bit of jargon.
Maybe they’re contrasting with sidereal days?
That was my initial thought, but that’s a difference of 10 mins over 3 days, and that’s orders of magnitudes more precise than should be used.
Which would be the same as the next 72 hours in PST
Any new auroras?