Space Weather Message Code: WARK04 Serial Number: 3512 Issue Time: 2018 Aug 16 0203 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3511 Valid From: 2018 Aug 15 2215 UTC Now Valid Until: 2018 Aug 16 1000 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: 2067 Issue Time: 2018 Aug 16 0002 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Aug 15 2359 UTC Synoptic Period: 2100-2359 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: 3511 Issue Time: 2018 Aug 15 2212 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Aug 15 2215 UTC Valid To: 2018 Aug 16 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: ALTK04 Serial Number: 2066 Issue Time: 2018 Aug 15 1355 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Aug 15 1350 UTC Synoptic Period: 1200-1500 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: 3510 Issue Time: 2018 Aug 15 1142 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Aug 15 1142 UTC Valid To: 2018 Aug 15 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: 2065 Issue Time: 2018 Aug 12 0000 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Aug 11 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

Space Weather Message Code: WARK04 Serial Number: 3509 Issue Time: 2018 Aug 11 1436 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Aug 11 1436 UTC Valid To: 2018 Aug 11 2359 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: 3508 Issue Time: 2018 Aug 07 1421 UTC CANCEL WARNING: Geomagnetic K-index of 4 expected Cancel Serial Number: 3507 Original Issue Time: 2018 Aug 07 1341 UTC Comment: Date error 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: 3507 Issue Time: 2018 Aug 07 1341 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Aug 10 1341 UTC Valid To: 2018 Aug 10 1600 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: 2064 Issue Time: 2018 Jul 24 2207 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Jul 24 2207 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