Space Weather Message Code: ALTK05 Serial Number: 1113 Issue Time: 2017 May 28 0330 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 May 28 0329 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: 433 Issue Time: 2017 May 28 0225 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2017 May 28 0224 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: ALTK05 Serial Number: 1112 Issue Time: 2017 May 28 0106 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 May 28 0105 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: ALTK06 Serial Number: 432 Issue Time: 2017 May 27 2323 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2017 May 27 2322 UTC Synoptic Period: 2100-2400 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: WARK06 Serial Number: 386 Issue Time: 2017 May 27 2320 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2017 May 27 2320 UTC Valid To: 2017 May 28 0600 UTC Warning Condition: Onset 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

Space Weather Message Code: ALTK05 Serial Number: 1111 Issue Time: 2017 May 27 2255 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 May 27 2255 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: WARK05 Serial Number: 1354 Issue Time: 2017 May 27 2204 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 May 27 2204 UTC Valid To: 2017 May 28 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

Space Weather Message Code: ALTK04 Serial Number: 1979 Issue Time: 2017 May 27 2202 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 May 27 2202 UTC Synoptic Period: 2100-2400 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: 3224 Issue Time: 2017 May 27 2045 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3223 Valid From: 2017 May 27 1530 UTC Now Valid Until: 2017 May 28 0900 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: WARK04 Serial Number: 3223 Issue Time: 2017 May 27 1523 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 May 27 1530 UTC Valid To: 2017 May 27 2100 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