Space Weather Message Code: ALTK04 Serial Number: 1973 Issue Time: 2017 Apr 20 0125 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Apr 20 0125 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: 3206 Issue Time: 2017 Apr 20 0104 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Apr 20 0105 UTC Valid To: 2017 Apr 20 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: ALTK05 Serial Number: 1094 Issue Time: 2017 Apr 19 0601 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Apr 19 0559 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: WARK05 Serial Number: 1340 Issue Time: 2017 Apr 19 0527 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Apr 19 0526 UTC Valid To: 2017 Apr 19 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: ALTK04 Serial Number: 1972 Issue Time: 2017 Apr 19 0449 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Apr 19 0449 UTC Synoptic Period: 0300-0600 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: 3205 Issue Time: 2017 Apr 19 0056 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Apr 19 0100 UTC Valid To: 2017 Apr 19 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: WATA20 Serial Number: 782 Issue Time: 2017 Apr 17 1805 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Apr 18: G1 (Minor) Apr 19: None (Below G1) Apr 20: None (Below G1) 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: WATA20 Serial Number: 781 Issue Time: 2017 Apr 14 1918 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Apr 15: None (Below G1) Apr 16: None (Below G1) Apr 17: 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: WARK04 Serial Number: 3204 Issue Time: 2017 Apr 14 1147 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3203 Valid From: 2017 Apr 14 0135 UTC Now Valid Until: 2017 Apr 14 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: ALTK04 Serial Number: 1971 Issue Time: 2017 Apr 14 0601 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Apr 14 0559 UTC Synoptic Period: 0300-0600 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