Space Weather Message Code: WARK04 Serial Number: 3289 Issue Time: 2017 Aug 23 1724 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3288 Valid From: 2017 Aug 22 2220 UTC Now Valid Until: 2017 Aug 23 2300 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: 1139 Issue Time: 2017 Aug 23 1502 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 23 1500 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.

Space Weather Message Code: WARK05 Serial Number: 1383 Issue Time: 2017 Aug 23 1412 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Aug 23 1411 UTC Valid To: 2017 Aug 23 1800 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: 3288 Issue Time: 2017 Aug 23 1029 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3287 Valid From: 2017 Aug 22 2220 UTC Now Valid Until: 2017 Aug 23 1800 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: 3287 Issue Time: 2017 Aug 23 0555 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3286 Valid From: 2017 Aug 22 2220 UTC Now Valid Until: 2017 Aug 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: ALTK04 Serial Number: 1997 Issue Time: 2017 Aug 23 0446 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Aug 23 0445 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: 3286 Issue Time: 2017 Aug 22 2219 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Aug 22 2220 UTC Valid To: 2017 Aug 23 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: ALTK05 Serial Number: 1138 Issue Time: 2017 Aug 22 0535 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Aug 22 0535 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: WARK05 Serial Number: 1382 Issue Time: 2017 Aug 22 0305 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1381 Valid From: 2017 Aug 22 0155 UTC Now Valid Until: 2017 Aug 22 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK06 Serial Number: 439 Issue Time: 2017 Aug 22 0303 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2017 Aug 22 0259 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