Space Weather Message Code: WARK04 Serial Number: 3283 Issue Time: 2017 Aug 21 1121 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3282 Valid From: 2017 Aug 17 0752 UTC Now Valid Until: 2017 Aug 21 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: 3282 Issue Time: 2017 Aug 21 0254 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3281 Valid From: 2017 Aug 17 0752 UTC Now Valid Until: 2017 Aug 21 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 –

Space Weather Message Code: WARK04 Serial Number: 3281 Issue Time: 2017 Aug 20 1455 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3280 Valid From: 2017 Aug 17 0752 UTC Now Valid Until: 2017 Aug 21 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: ALTK05 Serial Number: 1136 Issue Time: 2017 Aug 20 0535 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 20 0535 UTC Synoptic Period: 0300-0600 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: 1380 Issue Time: 2017 Aug 20 0208 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1379 Valid From: 2017 Aug 19 0117 UTC Now Valid Until: 2017 Aug 20 1500 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1135 Issue Time: 2017 Aug 20 0203 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 20 0203 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: 1134 Issue Time: 2017 Aug 19 1800 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 19 1759 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: WARK04 Serial Number: 3280 Issue Time: 2017 Aug 19 1436 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3279 Valid From: 2017 Aug 17 0752 UTC Now Valid Until: 2017 Aug 20 1500 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: 1133 Issue Time: 2017 Aug 19 0857 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 19 0857 UTC Synoptic Period: 0600-0900 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: 1378 Issue Time: 2017 Aug 19 0631 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1377 Valid From: 2017 Aug 19 0117 UTC Now Valid Until: 2017 Aug 19 1500 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 60 degrees Geomagnetic Latitude. Induced Currents –