Space Weather Message Code: WARK04 Serial Number: 3668 Issue Time: 2019 Sep 17 2228 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3667 Valid From: 2019 Sep 17 1740 UTC Now Valid Until: 2019 Sep 18 0300 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: ALTK04 Serial Number: 2126 Issue Time: 2019 Sep 17 2226 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2019 Sep 17 2226 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: 3667 Issue Time: 2019 Sep 17 1739 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2019 Sep 17 1740 UTC Valid To: 2019 Sep 17 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: ALTK04 Serial Number: 2125 Issue Time: 2019 Sep 17 0300 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2019 Sep 17 0259 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: ALTK04 Serial Number: 2124 Issue Time: 2019 Sep 16 0305 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2019 Sep 16 0259 UTC Synoptic Period: 0000-0300 UTC Active Warning: No 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: ALTK04 Serial Number: 2123 Issue Time: 2019 Sep 09 1111 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2019 Sep 09 1112 UTC Synoptic Period: 0900-1200 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: 3664 Issue Time: 2019 Sep 09 1055 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2019 Sep 09 1055 UTC Valid To: 2019 Sep 09 1800 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: ALTK04 Serial Number: 2122 Issue Time: 2019 Sep 06 0503 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2019 Sep 06 0503 UTC Synoptic Period: 0300-0600 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: 3663 Issue Time: 2019 Sep 06 0451 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2019 Sep 06 0451 UTC Valid To: 2019 Sep 06 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: WARK05 Serial Number: 1535 Issue Time: 2019 Sep 05 0527 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2019 Sep 05 0527 UTC Valid To: 2019 Sep 05 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