Auroras Possible Again Tonight April 24-25

The current Kp index graph as of 9 p.m. CDT. When the bars reach "5" and higher, an auroral storm is in progress. Credit: NOAA

Aurora is out this evening even if we can’t see it here in Duluth, Minn. because of clouds. The Kp index has shot up to “5” as of 7 p.m. CDT just like it did last night when auroras lit up the sky across the northern U.S. This means that a minor geomagnetic storm is in progress.

According to NOAA’s Space Weather Scales, minor storm effect from the high-speed solar wind particles blowing our way include:

* Weak fluctuations in power grids
* Minor impact on satellite operations possible
* Migratory animals are affected at this and higher levels; aurora is commonly visible at high latitudes (northern U.S.)

Be sure to get outside for a look at the northern sky before going to bed tonight. You might just see northern lights.

UPDATE 10 p.m. CDT: Activity dropped off a smidge to “4”.