Space Weather Message Code: WARK04 Serial Number: 3296 Issue Time: 2017 Aug 31 1101 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3295 Valid From: 2017 Aug 31 0510 UTC Now Valid Until: 2017 Aug 31 1900 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: 1142 Issue Time: 2017 Aug 31 1034 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 31 1022 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: 1141 Issue Time: 2017 Aug 31 0832 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 31 0823 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: ALTK04 Serial Number: 1999 Issue Time: 2017 Aug 31 0717 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Aug 31 0709 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes 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 – Weak power grid fluctuations can occur. Aurora – Aurora may be

Space Weather Message Code: WARK05 Serial Number: 1385 Issue Time: 2017 Aug 31 0544 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Aug 31 0543 UTC Valid To: 2017 Aug 31 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: WARK04 Serial Number: 3295 Issue Time: 2017 Aug 31 0510 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Aug 31 0510 UTC Valid To: 2017 Aug 31 1200 UTC Warning Condition: Onset 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 – Weak power grid fluctuations can occur. Aurora

Space Weather Message Code: WARK04 Serial Number: 3294 Issue Time: 2017 Aug 29 2354 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3293 Valid From: 2017 Aug 29 1929 UTC Now Valid Until: 2017 Aug 30 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: ALTK04 Serial Number: 1998 Issue Time: 2017 Aug 29 1934 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Aug 29 1934 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes 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 – Weak power grid fluctuations can occur. Aurora – Aurora may be

Space Weather Message Code: WARK04 Serial Number: 3293 Issue Time: 2017 Aug 29 1929 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Aug 29 1929 UTC Valid To: 2017 Aug 29 2359 UTC Warning Condition: Onset 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 – Weak power grid fluctuations can occur. Aurora

Space Weather Message Code: WATA20 Serial Number: 796 Issue Time: 2017 Aug 29 1839 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Aug 30: None (Below G1) Aug 31: G1 (Minor) Sep 01: G1 (Minor) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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