Space Weather Message Code: WARK04 Serial Number: 3278 Issue Time: 2017 Aug 18 1755 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3277 Valid From: 2017 Aug 17 0752 UTC Now Valid Until: 2017 Aug 19 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: 3277 Issue Time: 2017 Aug 18 0457 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3276 Valid From: 2017 Aug 17 0752 UTC Now Valid Until: 2017 Aug 18 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: 1375 Issue Time: 2017 Aug 18 0212 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Aug 18 0212 UTC Valid To: 2017 Aug 18 1200 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: WARK05 Serial Number: 1374 Issue Time: 2017 Aug 17 1448 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1373 Valid From: 2017 Aug 17 0808 UTC Now Valid Until: 2017 Aug 17 2100 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: WARK04 Serial Number: 3276 Issue Time: 2017 Aug 17 1447 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3275 Valid From: 2017 Aug 17 0752 UTC Now Valid Until: 2017 Aug 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: ALTK05 Serial Number: 1130 Issue Time: 2017 Aug 17 1359 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 17 1350 UTC Synoptic Period: 1200-1500 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: WARK06 Serial Number: 391 Issue Time: 2017 Aug 17 1151 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2017 Aug 17 1150 UTC Valid To: 2017 Aug 17 1500 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: 1129 Issue Time: 2017 Aug 17 1146 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 17 1146 UTC Synoptic Period: 0900-1200 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: 1128 Issue Time: 2017 Aug 17 0817 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 17 0816 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: 1373 Issue Time: 2017 Aug 17 0809 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Aug 17 0808 UTC Valid To: 2017 Aug 17 1500 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