Space Weather Message Code: ALTK05 Serial Number: 1167 Issue Time: 2017 Sep 27 2011 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Sep 27 2010 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes NOAA Scale: G1 – Minor NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents – Weak power grid fluctuations can occur.

Space Weather Message Code: WATA30 Serial Number: 170 Issue Time: 2017 Sep 27 1947 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Sep 28: G2 (Moderate) Sep 29: G1 (Minor) Sep 30: None (Below G1) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced

Space Weather Message Code: WARK04 Serial Number: 3330 Issue Time: 2017 Sep 27 1705 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3329 Valid From: 2017 Sep 27 0610 UTC Now Valid Until: 2017 Sep 28 1200 UTC Warning Condition: Persistence NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1166 Issue Time: 2017 Sep 27 0848 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Sep 27 0848 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Scale: G1 – Minor NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents – Weak power grid fluctuations can occur.

Space Weather Message Code: WARK05 Serial Number: 1409 Issue Time: 2017 Sep 27 0749 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Sep 27 0749 UTC Valid To: 2017 Sep 27 1800 UTC Warning Condition: Onset NOAA Scale: G1 – Minor NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents – Weak power

Space Weather Message Code: WARK04 Serial Number: 3329 Issue Time: 2017 Sep 27 0745 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3328 Valid From: 2017 Sep 27 0610 UTC Now Valid Until: 2017 Sep 27 2100 UTC Warning Condition: Onset NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK04 Serial Number: 2006 Issue Time: 2017 Sep 27 0744 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Sep 27 0745 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents – Weak power grid fluctuations can occur. Aurora – Aurora may be

Space Weather Message Code: WARK04 Serial Number: 3328 Issue Time: 2017 Sep 27 0611 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Sep 27 0610 UTC Valid To: 2017 Sep 27 1500 UTC Warning Condition: Onset NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents – Weak power grid fluctuations can occur. Aurora

Space Weather Message Code: WATA30 Serial Number: 169 Issue Time: 2017 Sep 25 2046 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Sep 26: None (Below G1) Sep 27: G1 (Minor) Sep 28: G2 (Moderate) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced

Space Weather Message Code: WARK04 Serial Number: 3327 Issue Time: 2017 Sep 24 2304 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Sep 24 2303 UTC Valid To: 2017 Sep 25 1500 UTC Warning Condition: Onset NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents – Weak power grid fluctuations can occur. Aurora