Space Weather Message Code: ALTK04 Serial Number: 2077 Issue Time: 2018 Sep 21 2344 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Sep 21 2345 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

Space Weather Message Code: WARK04 Serial Number: 3537 Issue Time: 2018 Sep 21 2333 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Sep 21 2335 UTC Valid To: 2018 Sep 22 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 – Weak power grid fluctuations can occur. Aurora

Space Weather Message Code: WATA20 Serial Number: 837 Issue Time: 2018 Sep 20 1543 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Sep 21: None (Below G1) Sep 22: None (Below G1) Sep 23: 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 60 degrees Geomagnetic Latitude.

Space Weather Message Code: WARK04 Serial Number: 3536 Issue Time: 2018 Sep 17 0321 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Sep 17 0320 UTC Valid To: 2018 Sep 17 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 – Weak power grid fluctuations can occur. Aurora

Space Weather Message Code: ALTK05 Serial Number: 1241 Issue Time: 2018 Sep 14 0302 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2018 Sep 14 0259 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: WARK05 Serial Number: 1495 Issue Time: 2018 Sep 14 0235 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2018 Sep 14 0235 UTC Valid To: 2018 Sep 14 0900 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: ALTK04 Serial Number: 2076 Issue Time: 2018 Sep 14 0222 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Sep 14 0222 UTC Synoptic Period: 0000-0300 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: 3535 Issue Time: 2018 Sep 14 0106 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Sep 14 0105 UTC Valid To: 2018 Sep 14 0900 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: WARK04 Serial Number: 3534 Issue Time: 2018 Sep 13 1132 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3533 Valid From: 2018 Sep 13 0000 UTC Now Valid Until: 2018 Sep 13 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: WARK04 Serial Number: 3533 Issue Time: 2018 Sep 13 0529 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3532 Valid From: 2018 Sep 13 0000 UTC Now Valid Until: 2018 Sep 13 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 –