Space Weather Message Code: WARK04 Serial Number: 3529 Issue Time: 2018 Sep 11 0425 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3528 Valid From: 2018 Sep 10 1610 UTC Now Valid Until: 2018 Sep 11 1800 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: WARK05 Serial Number: 1493 Issue Time: 2018 Sep 11 0424 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2018 Sep 11 0423 UTC Valid To: 2018 Sep 11 1200 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: ALTK05 Serial Number: 1237 Issue Time: 2018 Sep 10 2344 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2018 Sep 10 2344 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: ALTK05 Serial Number: 1236 Issue Time: 2018 Sep 10 2101 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2018 Sep 10 2059 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: WARK04 Serial Number: 3528 Issue Time: 2018 Sep 10 2036 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3527 Valid From: 2018 Sep 10 1610 UTC Now Valid Until: 2018 Sep 11 0600 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: 1235 Issue Time: 2018 Sep 10 1745 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2018 Sep 10 1745 UTC Synoptic Period: 1500-1800 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: 2074 Issue Time: 2018 Sep 10 1733 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Sep 10 1733 UTC Synoptic Period: 1500-1800 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: WARK05 Serial Number: 1491 Issue Time: 2018 Sep 10 1729 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2018 Sep 10 1730 UTC Valid To: 2018 Sep 10 2100 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: 3527 Issue Time: 2018 Sep 10 1611 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Sep 10 1610 UTC Valid To: 2018 Sep 10 2300 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: 175 Issue Time: 2018 Sep 09 2030 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Sep 10: None (Below G1) Sep 11: G2 (Moderate) Sep 12: 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