Space Weather Message Code: WARK04 Serial Number: 3255 Issue Time: 2017 Jul 21 2354 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3254 Valid From: 2017 Jul 21 0212 UTC Now Valid Until: 2017 Jul 22 0600 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: 3254 Issue Time: 2017 Jul 21 1356 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3253 Valid From: 2017 Jul 21 0212 UTC Now Valid Until: 2017 Jul 21 2359 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: 3253 Issue Time: 2017 Jul 21 0555 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3252 Valid From: 2017 Jul 21 0212 UTC Now Valid Until: 2017 Jul 21 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 65 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK04 Serial Number: 1990 Issue Time: 2017 Jul 21 0233 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Jul 21 0232 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: 3252 Issue Time: 2017 Jul 21 0214 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Jul 21 0212 UTC Valid To: 2017 Jul 21 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: 3251 Issue Time: 2017 Jul 18 0555 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3250 Valid From: 2017 Jul 16 0520 UTC Now Valid Until: 2017 Jul 18 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: 3250 Issue Time: 2017 Jul 17 2255 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3249 Valid From: 2017 Jul 16 0520 UTC Now Valid Until: 2017 Jul 18 0600 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: ALTK06 Serial Number: 438 Issue Time: 2017 Jul 17 1642 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2017 Jul 17 1642 UTC Synoptic Period: 1500-1800 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: 390 Issue Time: 2017 Jul 17 1627 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2017 Jul 17 1626 UTC Valid To: 2017 Jul 17 2100 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: 1126 Issue Time: 2017 Jul 17 1607 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Jul 17 1607 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.