Space Weather Message Code: ALTK05 Serial Number: 1188 Issue Time: 2017 Oct 24 1800 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Oct 24 1759 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: 1427 Issue Time: 2017 Oct 24 1439 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Oct 24 1438 UTC Valid To: 2017 Oct 24 2100 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: ALTK04 Serial Number: 2011 Issue Time: 2017 Oct 24 1436 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Oct 24 1435 UTC Synoptic Period: 1200-1500 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: 3350 Issue Time: 2017 Oct 24 1217 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Oct 24 1216 UTC Valid To: 2017 Oct 24 1600 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: 172 Issue Time: 2017 Oct 23 2017 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Oct 24: G1 (Minor) Oct 25: G2 (Moderate) Oct 26: 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 55 degrees Geomagnetic Latitude. Induced Currents

Space Weather Message Code: WATA30 Serial Number: 171 Issue Time: 2017 Oct 22 1621 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Oct 23: None (Below G1) Oct 24: G1 (Minor) 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

Space Weather Message Code: WATA20 Serial Number: 803 Issue Time: 2017 Oct 21 1612 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Oct 22: None (Below G1) Oct 23: None (Below G1) Oct 24: 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.

Space Weather Message Code: WARK04 Serial Number: 3349 Issue Time: 2017 Oct 20 0249 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3348 Valid From: 2017 Oct 19 1723 UTC Now Valid Until: 2017 Oct 20 1300 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: 2010 Issue Time: 2017 Oct 20 0145 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Oct 20 0145 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: 3348 Issue Time: 2017 Oct 19 1723 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Oct 19 1723 UTC Valid To: 2017 Oct 20 0300 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