Parts of the Northern US and Canada were treated to an unexpected aurora outbreak Wednesday night as the KP index neared 7 during a G3 geomagnetic storm. Here in Pennsylvania, our focus was mainly on the damaging winds that left over 100k homes and businesses without power at one point.
We now have another opportunity for aurora borealis on Thursday evening into the overnight period as the G3 storm is forecast to continue with the arrival of CMEs. With earlier sunsets, you won’t have to venture out late at night as in summer.
Cloud cover looks to be about 20-40%, with high clouds possible. Below is model blend cloud cover percentage for 8:00 PM Thursday with the key at the bottom.
Northern Lights Timing
A maximum KP of 7.33 is currently projected by NOAA’s Space Weather Prediction Center during 7 – 10 PM Eastern Time Thursday evening, and again between 4 – 7 AM Friday. The view line with the naked eye stretches across Northern PA, but these events are difficult to nail precisely.
A full moon may take away slightly from the vibrancy of the northern lights, but if we can actually get a KP of 7+, and southerly Bz winds, than we will have a great opportunity to view the aurora.
Another Must Read: First Snow Potential of Fall ’25 Comes Mon-Tue in Much of Pennsylvania
NORTHERN LIGHTS FORECAST FOR THURSDAY EVENING
This forecast is reliant on a KP of 7+ being reached and southerly Bz winds, at least intermittently during the evening.
Area A: Light cloud cover, very low light pollution, and increased altitude will give these locations the best chance of viewing vibrant aurora in PA. You may briefly see pillars with the naked eye.
Area B: Light to locally moderate cloud cover and some light pollution will likely make viewing the northern lights only possible through a camera lens. Still potentially a great opportunity to photograph the aurora!
Area C: Light to moderate cloud cover and significant light pollution will hinder aurora borealis viewing. It may still be possible in long exposure camera shots if the solar storm cooperates!
Be sure to pass along this forecast with friends who may be interested in seeing the northern lights!
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