Space Weather Message Code: ALTK04 Serial Number: 2020 Issue Time: 2017 Nov 28 0300 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Nov 28 0259 UTC Synoptic Period: 0000-0300 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: 3383 Issue Time: 2017 Nov 28 0216 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Nov 28 0215 UTC Valid To: 2017 Nov 28 1500 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: 810 Issue Time: 2017 Nov 26 2200 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Nov 27: None (Below G1) Nov 28: None (Below G1) Nov 29: 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.

Space Weather Message Code: ALTK04 Serial Number: 2019 Issue Time: 2017 Nov 25 0305 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Nov 25 0259 UTC Synoptic Period: 0000-0300 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: 3382 Issue Time: 2017 Nov 25 0127 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Nov 25 0127 UTC Valid To: 2017 Nov 25 0900 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: 3381 Issue Time: 2017 Nov 21 2243 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3380 Valid From: 2017 Nov 20 2320 UTC Now Valid Until: 2017 Nov 22 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: WARK05 Serial Number: 1442 Issue Time: 2017 Nov 21 2242 UTC CANCEL WARNING: Geomagnetic K-index of 5 expected Cancel Serial Number: 1441 Original Issue Time: 2017 Nov 21 0434 UTC Comment: G1 Warrning extension issued by mistake. 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

Space Weather Message Code: WARK05 Serial Number: 1441 Issue Time: 2017 Nov 21 2240 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1440 Valid From: 2017 Nov 21 0432 UTC Now Valid Until: 2017 Nov 22 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK05 Serial Number: 1440 Issue Time: 2017 Nov 21 1148 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1439 Valid From: 2017 Nov 21 0432 UTC Now Valid Until: 2017 Nov 21 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1200 Issue Time: 2017 Nov 21 0825 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Nov 21 0825 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.