Space Weather Message Code: WARK07 Serial Number: 74 Issue Time: 2018 Aug 26 0444 UTC WARNING: Geomagnetic K-index of 7 or greater expected Valid From: 2018 Aug 26 0444 UTC Valid To: 2018 Aug 26 0900 UTC Warning Condition: Onset NOAA Scale: G3 or greater – Strong to Extreme NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic

Space Weather Message Code: ALTK06 Serial Number: 464 Issue Time: 2018 Aug 26 0425 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2018 Aug 26 0425 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes 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 fluctuations can occur. High-latitude

Space Weather Message Code: ALTK05 Serial Number: 1227 Issue Time: 2018 Aug 26 0346 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2018 Aug 26 0346 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: ALTK06 Serial Number: 463 Issue Time: 2018 Aug 26 0257 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2018 Aug 26 0257 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes 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 fluctuations can occur. High-latitude

Space Weather Message Code: WARK04 Serial Number: 3518 Issue Time: 2018 Aug 26 0213 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3517 Valid From: 2018 Aug 25 2109 UTC Now Valid Until: 2018 Aug 26 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: ALTK06 Serial Number: 463 Issue Time: 2018 Aug 26 0257 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2018 Aug 26 0257 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes 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 fluctuations can occur. High-latitude

Space Weather Message Code: WARK05 Serial Number: 1485 Issue Time: 2018 Aug 26 0241 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1484 Valid From: 2018 Aug 25 2146 UTC Now Valid Until: 2018 Aug 26 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK04 Serial Number: 3518 Issue Time: 2018 Aug 26 0213 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3517 Valid From: 2018 Aug 25 2109 UTC Now Valid Until: 2018 Aug 26 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: 1226 Issue Time: 2018 Aug 26 0154 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2018 Aug 26 0154 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: WARK05 Serial Number: 1484 Issue Time: 2018 Aug 25 2146 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2018 Aug 25 2146 UTC Valid To: 2018 Aug 26 0600 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