Space Weather Message Code: WARK05 Serial Number: 1443 Issue Time: 2017 Dec 05 0818 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Dec 05 0818 UTC Valid To: 2017 Dec 05 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

Space Weather Message Code: WARK04 Serial Number: 3387 Issue Time: 2017 Dec 05 0550 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3386 Valid From: 2017 Dec 04 1620 UTC Now Valid Until: 2017 Dec 05 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: 2022 Issue Time: 2017 Dec 04 1801 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Dec 04 1759 UTC Synoptic Period: 1500-1800 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: 3386 Issue Time: 2017 Dec 04 1620 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Dec 04 1620 UTC Valid To: 2017 Dec 05 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: 3385 Issue Time: 2017 Dec 04 0521 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Dec 04 0520 UTC Valid To: 2017 Dec 04 1500 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: 174 Issue Time: 2017 Dec 03 2158 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Dec 04: G2 (Moderate) Dec 05: G2 (Moderate) Dec 06: 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: 173 Issue Time: 2017 Dec 02 1621 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Dec 03: None (Below G1) Dec 04: G2 (Moderate) Dec 05: 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: 811 Issue Time: 2017 Dec 01 2154 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Dec 02: None (Below G1) Dec 03: None (Below G1) Dec 04: 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: ALTK04 Serial Number: 2021 Issue Time: 2017 Nov 30 0420 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Nov 30 0420 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: 3384 Issue Time: 2017 Nov 30 0344 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Nov 30 0343 UTC Valid To: 2017 Nov 30 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