I copied/pasted below from SpaceWeather.com - it's fairly certain there will be a geomagnetic storm sometime on the 19th. A G2 class storm could mean that the aurora will be visible to the unaided eye in parts of the PNW.
AND ANOTHER CME IS COMING: A huge magnetic filament erupted on Sept. 16th (movie), hurling a CME almost directly toward Earth:
NOAA and NASA models agree that the CME should hit Earth's magnetic field on Sept. 19th. NOAA says early on the 19th, NASA says late, which gives a sense of the uncertainties in their respective forecasts. The impact could spark G1 (Minor) to G2-class (Moderate) geomagnetic storms. During a similar G2 storm on Sept. 12th, auroras were photographed in multiple US states as far south as Colorado and Missouri. It could happen again this week.
AND ANOTHER CME IS COMING: A huge magnetic filament erupted on Sept. 16th (movie), hurling a CME almost directly toward Earth:
NOAA and NASA models agree that the CME should hit Earth's magnetic field on Sept. 19th. NOAA says early on the 19th, NASA says late, which gives a sense of the uncertainties in their respective forecasts. The impact could spark G1 (Minor) to G2-class (Moderate) geomagnetic storms. During a similar G2 storm on Sept. 12th, auroras were photographed in multiple US states as far south as Colorado and Missouri. It could happen again this week.
