Overhead Alberta Aurora Possible July 23

Cause: Combination of Coronal Hole High Speed Stream (CH HSS) and Coronal Mass Ejections (CME) from July 20 and 21

Quiet to active conditions are expected through 24 Jul under negative polarity CH HSS effects combined with the anticipated arrival of CMEs that left the Sun on 20 and 21 July beginning on late day one (23 Jul). G1 (Minor) geomagnetic storming is likely on 24 Jul if the latter of the two events arrives at Earth. Again, modeling suggests that a bulk of the material from this event should pass north and ahead of Earth, but higher levels of geomagnetic storming (25% for G2 or greater) cannot be ruled out if this event is indeed more Earth-directed than predicted.
- Space Weather Prediction Center

Overhead/KP5 Aurora can be 100's of kms long over Alberta, can often be seen throughout the province from rural areas.

• Locations: anywhere in Alberta with clear skies

• KP4 can be seen halfway up the northern sky, approaching overhead

• KP5/G1 can be seen overhead

• KP6/G2 and greater can be seen overhead and possibly under urban skies

• KP7/G3 and greater can be seen across the entire sky and possibly under urban skies

• KP4 can be halfway up the northern sky

• KP5/G1 can approach overhead

• KP6/G2 and greater can be seen overhead and possibly under urban skies

• KP7/G3 and greater can be seen across the entire sky and possibly under urban skies

• KP4 Aurora may not be high enough to be visible over the mountains

• KP5/G1 can peek over the mountain tops

• KP6/G2 and greater can be seen overhead

• KP7/G3 and greater can be seen across the entire sky and possibly under urban skies

• KP4 Aurora may be visible on the northern horizon

• KP5/G1 can can be halfway up the northern sky

• KP6/G2 and greater can be seen overhead

• KP7/G3 and greater can be seen across the entire sky and possibly under urban skies

• If you're in an area with a lot of people, there will be cars with headlights on; don't let it upset you.

• If you're parking in a place with a lot of people, try to turn your headlights off if possible

• Drive carefully, park your car fully off the road

• Stay off of private property

Forecast sources
https://services.swpc.noaa.gov/text/3-day-geomag-forecast.txt
https://services.swpc.noaa.gov/text/discussion.txt
SpaceWeatherLive