Space Weather Message Code: WARK04 Serial Number: 3262 Issue Time: 2017 Jul 26 0729 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Jul 26 0729 UTC Valid To: 2017 Jul 26 1200 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: 3261 Issue Time: 2017 Jul 26 0038 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Jul 26 0037 UTC Valid To: 2017 Jul 26 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: ALTK04 Serial Number: 1992 Issue Time: 2017 Jul 25 0001 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Jul 24 2359 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: 3260 Issue Time: 2017 Jul 24 2300 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Jul 24 2300 UTC Valid To: 2017 Jul 25 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: ALTK04 Serial Number: 1991 Issue Time: 2017 Jul 23 2324 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Jul 23 2323 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: 3259 Issue Time: 2017 Jul 23 2312 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Jul 23 2312 UTC Valid To: 2017 Jul 24 1200 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: 3258 Issue Time: 2017 Jul 23 0551 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3257 Valid From: 2017 Jul 21 0212 UTC Now Valid Until: 2017 Jul 23 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: 3257 Issue Time: 2017 Jul 22 1440 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3256 Valid From: 2017 Jul 21 0212 UTC Now Valid Until: 2017 Jul 23 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: ALTK05 Serial Number: 1127 Issue Time: 2017 Jul 22 1142 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Jul 22 1142 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: WARK05 Serial Number: 1369 Issue Time: 2017 Jul 22 1029 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Jul 22 1028 UTC Valid To: 2017 Jul 22 1500 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