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 –

Space Weather Message Code: ALTK05 Serial Number: 1132 Issue Time: 2017 Aug 19 0301 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 19 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: WARK04 Serial Number: 3279 Issue Time: 2017 Aug 19 0125 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3278 Valid From: 2017 Aug 17 0752 UTC Now Valid Until: 2017 Aug 19 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: 1377 Issue Time: 2017 Aug 19 0117 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Aug 19 0117 UTC Valid To: 2017 Aug 19 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: ALTK05 Serial Number: 1131 Issue Time: 2017 Aug 18 2000 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 18 1959 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: WARK05 Serial Number: 1376 Issue Time: 2017 Aug 18 1936 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Aug 18 1935 UTC Valid To: 2017 Aug 18 2359 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