Space Weather Message Code: ALTK04 Serial Number: 1982 Issue Time: 2017 Jun 03 1646 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Jun 03 1645 UTC Synoptic Period: 1500-1800 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: 1357 Issue Time: 2017 Jun 03 1332 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Jun 03 1330 UTC Valid To: 2017 Jun 03 2100 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: 3228 Issue Time: 2017 Jun 03 1208 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Jun 03 1210 UTC Valid To: 2017 Jun 03 1800 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: ALTK04 Serial Number: 1981 Issue Time: 2017 May 30 0601 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 May 30 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

Space Weather Message Code: WARK04 Serial Number: 3227 Issue Time: 2017 May 30 0330 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 May 30 0330 UTC Valid To: 2017 May 30 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: ALTK04 Serial Number: 1980 Issue Time: 2017 May 29 1352 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 May 29 1348 UTC Synoptic Period: 1200-1500 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: 3226 Issue Time: 2017 May 29 1321 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 May 29 1322 UTC Valid To: 2017 May 29 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

Space Weather Message Code: WARK05 Serial Number: 1356 Issue Time: 2017 May 28 1443 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1355 Valid From: 2017 May 27 2204 UTC Now Valid Until: 2017 May 28 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1115 Issue Time: 2017 May 28 1026 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 May 28 1020 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: ALTK06 Serial Number: 435 Issue Time: 2017 May 28 0824 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2017 May 28 0823 UTC Synoptic Period: 0600-0900 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