Space Weather Message Code: WARK04 Serial Number: 3322 Issue Time: 2017 Sep 17 2343 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3321 Valid From: 2017 Sep 14 1310 UTC Now Valid Until: 2017 Sep 18 0600 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: 3321 Issue Time: 2017 Sep 17 1147 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3320 Valid From: 2017 Sep 14 1310 UTC Now Valid Until: 2017 Sep 17 2359 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: 3320 Issue Time: 2017 Sep 16 1517 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3319 Valid From: 2017 Sep 14 1310 UTC Now Valid Until: 2017 Sep 17 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: WARK05 Serial Number: 1406 Issue Time: 2017 Sep 16 1458 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1405 Valid From: 2017 Sep 14 1445 UTC Now Valid Until: 2017 Sep 17 0900 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: WARK05 Serial Number: 1405 Issue Time: 2017 Sep 16 0837 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1404 Valid From: 2017 Sep 14 1445 UTC Now Valid Until: 2017 Sep 16 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: WARK06 Serial Number: 403 Issue Time: 2017 Sep 16 0533 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2017 Sep 16 0532 UTC Valid To: 2017 Sep 16 0900 UTC Warning Condition: Onset NOAA Scale: G2 – Moderate NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents – Power grid

Space Weather Message Code: ALTK05 Serial Number: 1164 Issue Time: 2017 Sep 16 0457 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Sep 16 0455 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: ALTK05 Serial Number: 1163 Issue Time: 2017 Sep 16 0233 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Sep 16 0231 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: 1162 Issue Time: 2017 Sep 15 2344 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Sep 15 2342 UTC Synoptic Period: 2100-2400 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: 1404 Issue Time: 2017 Sep 15 2321 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1403 Valid From: 2017 Sep 14 1445 UTC Now Valid Until: 2017 Sep 16 0900 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 –