Space Weather Message Code: WATA30 Serial Number: 140 Issue Time: 2016 Sep 25 2105 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Sep 26: G1 (Minor) Sep 27: None (Below G1) Sep 28: 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: ALTK05 Serial Number: 1007 Issue Time: 2016 Sep 25 2037 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2016 Sep 25 2037 UTC Synoptic Period: 1800-2100 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: 1232 Issue Time: 2016 Sep 25 2035 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2016 Sep 25 2035 UTC Valid To: 2016 Sep 25 2300 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: 1924 Issue Time: 2016 Sep 25 2028 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2016 Sep 25 2028 UTC Synoptic Period: 1800-2100 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: 2983 Issue Time: 2016 Sep 25 2022 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2016 Sep 25 2022 UTC Valid To: 2016 Sep 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: ALTK05 Serial Number: 1006 Issue Time: 2016 Sep 25 0559 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2016 Sep 25 0559 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: 1231 Issue Time: 2016 Sep 25 0417 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2016 Sep 25 0415 UTC Valid To: 2016 Sep 25 0900 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: 1923 Issue Time: 2016 Sep 25 0222 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2016 Sep 25 0220 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: 2982 Issue Time: 2016 Sep 25 0202 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2016 Sep 25 0200 UTC Valid To: 2016 Sep 25 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: ALTK04 Serial Number: 1922 Issue Time: 2016 Sep 21 0225 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2016 Sep 21 0210 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