I am posting a link on the side bar to a stack of Norwegian magnetometers. When they go negative we know that auroral propagation is possible. The one I watch is Rorvik ("rvk"). Thanks to Gianfranco, now IU1DZZ, for giving me the link in the first place.
Here is a screenshot of today's magnetometers. There is a bit of disturbance - I wonder will we get aurora..
Worth keeping an eye on if you can access auroral propagation, and it gives warning of HF blackouts too. These are the relevant ones for me; you can find the Boulder Colorado one and the Sundsvall one in Sweden on the SolarHam pages.