Space Weather Message Code: ALTK04 Serial Number: 1930 Issue Time: 2016 Oct 24 0304 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2016 Oct 24 0259 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: 3023 Issue Time: 2016 Oct 24 0212 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2016 Oct 24 0215 UTC Valid To: 2016 Oct 24 1400 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: WATA30 Serial Number: 147 Issue Time: 2016 Oct 23 2034 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Oct 24: G2 (Moderate) Oct 25: G2 (Moderate) Oct 26: G2 (Moderate) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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

Space Weather Message Code: WARK04 Serial Number: 3022 Issue Time: 2016 Oct 23 0803 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2016 Oct 23 0802 UTC Valid To: 2016 Oct 23 2200 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: WATA30 Serial Number: 146 Issue Time: 2016 Oct 22 2136 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Oct 23: G1 (Minor) Oct 24: G2 (Moderate) Oct 25: G2 (Moderate) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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

Space Weather Message Code: WATA30 Serial Number: 145 Issue Time: 2016 Oct 21 1913 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Oct 22: G1 (Minor) Oct 23: G1 (Minor) Oct 24: G2 (Moderate) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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

Space Weather Message Code: WATA20 Serial Number: 747 Issue Time: 2016 Oct 20 1838 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Oct 21: None (Below G1) Oct 22: G1 (Minor) Oct 23: G1 (Minor) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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

Space Weather Message Code: WARK04 Serial Number: 3021 Issue Time: 2016 Oct 18 0242 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3020 Valid From: 2016 Oct 16 0804 UTC Now Valid Until: 2016 Oct 18 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 65 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK04 Serial Number: 3020 Issue Time: 2016 Oct 17 2034 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3019 Valid From: 2016 Oct 16 0804 UTC Now Valid Until: 2016 Oct 18 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: WATA30 Serial Number: 144 Issue Time: 2016 Oct 17 1254 UTC CANCEL WATCH: Geomagnetic Storm Category G2 Predicted Cancel Serial Number: 143 Original Issue Time: 2016 Oct 16 2112 UTC Comment: G2 (Moderate) geomagnetic storm potential is no longer evident in available solar wind data. Activity is now forecast below G1 (minor) conditions. NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area