Space Weather Message Code: ALTK05 Serial Number: 1106 Issue Time: 2017 Apr 22 2240 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Apr 22 2240 UTC Synoptic Period: 2100-2400 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: WATA30 Serial Number: 155 Issue Time: 2017 Apr 22 2046 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Apr 23: G2 (Moderate) Apr 24: G1 (Minor) Apr 25: 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 55 degrees Geomagnetic Latitude. Induced Currents

Space Weather Message Code: ALTK05 Serial Number: 1105 Issue Time: 2017 Apr 22 1647 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Apr 22 1641 UTC Synoptic Period: 1500-1800 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: 383 Issue Time: 2017 Apr 22 1426 UTC EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 382 Valid From: 2017 Apr 22 0245 UTC Now Valid Until: 2017 Apr 22 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 55 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1104 Issue Time: 2017 Apr 22 1348 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Apr 22 1346 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: 382 Issue Time: 2017 Apr 22 1058 UTC EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 381 Valid From: 2017 Apr 22 0245 UTC Now Valid Until: 2017 Apr 22 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 55 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1103 Issue Time: 2017 Apr 22 1022 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Apr 22 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: WARK06 Serial Number: 381 Issue Time: 2017 Apr 22 0852 UTC EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 380 Valid From: 2017 Apr 22 0245 UTC Now Valid Until: 2017 Apr 22 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 55 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK06 Serial Number: 428 Issue Time: 2017 Apr 22 0559 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2017 Apr 22 0559 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: 1101 Issue Time: 2017 Apr 22 0422 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Apr 22 0421 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.