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

Space Weather Message Code: WARK04 Serial Number: 3203 Issue Time: 2017 Apr 14 0557 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3202 Valid From: 2017 Apr 14 0135 UTC Now Valid Until: 2017 Apr 14 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 65 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK04 Serial Number: 3202 Issue Time: 2017 Apr 14 0133 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Apr 14 0135 UTC Valid To: 2017 Apr 14 0600 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: 3201 Issue Time: 2017 Apr 12 0159 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Apr 12 0200 UTC Valid To: 2017 Apr 12 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: 3200 Issue Time: 2017 Apr 11 1454 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3199 Valid From: 2017 Apr 11 1030 UTC Now Valid Until: 2017 Apr 11 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 65 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK04 Serial Number: 1970 Issue Time: 2017 Apr 11 1203 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Apr 11 1159 UTC Synoptic Period: 0900-1200 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: 3199 Issue Time: 2017 Apr 11 1030 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Apr 11 1030 UTC Valid To: 2017 Apr 11 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: WARK04 Serial Number: 3198 Issue Time: 2017 Apr 09 1239 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3197 Valid From: 2017 Apr 07 2348 UTC Now Valid Until: 2017 Apr 10 0300 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: 1339 Issue Time: 2017 Apr 09 0542 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1338 Valid From: 2017 Apr 09 0130 UTC Now Valid Until: 2017 Apr 09 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1093 Issue Time: 2017 Apr 09 0458 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Apr 09 0458 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.