Space Weather Message Code: ALTK05 Serial Number: 1156 Issue Time: 2017 Sep 13 0043 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Sep 12 0040 UTC Synoptic Period: 0000-0300 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: ALTK05 Serial Number: 1155 Issue Time: 2017 Sep 12 2340 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Sep 12 2340 UTC Synoptic Period: 2100-2400 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: ALTK04 Serial Number: 2004 Issue Time: 2017 Sep 12 2112 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Sep 12 2059 UTC Synoptic Period: 1800-2100 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: WATA30 Serial Number: 168 Issue Time: 2017 Sep 12 2057 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Sep 13: G2 (Moderate) Sep 14: G1 (Minor) Sep 15: G1 (Minor) 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 Currents

Space Weather Message Code: WARK05 Serial Number: 1397 Issue Time: 2017 Sep 12 2033 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Sep 12 2031 UTC Valid To: 2017 Sep 13 0300 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: 3314 Issue Time: 2017 Sep 12 2032 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3313 Valid From: 2017 Sep 12 1942 UTC Now Valid Until: 2017 Sep 13 1200 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: WARK04 Serial Number: 3313 Issue Time: 2017 Sep 12 1943 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Sep 12 1942 UTC Valid To: 2017 Sep 13 0300 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: 167 Issue Time: 2017 Sep 11 1921 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Sep 12: None (Below G1) Sep 13: G2 (Moderate) Sep 14: G1 (Minor) 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: WATA30 Serial Number: 166 Issue Time: 2017 Sep 11 1147 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Sep 11: None (Below G1) Sep 12: None (Below G1) Sep 13: 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.

Space Weather Message Code: ALTK04 Serial Number: 2003 Issue Time: 2017 Sep 11 0110 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Sep 10 2359 UTC Synoptic Period: 2100-2400 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