Space Weather Message Code: WATA30 Serial Number: 183 Issue Time: 2019 Sep 26 1711 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Sep 27: G1 (Minor) Sep 28: G2 (Moderate) Sep 29: 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: 182 Issue Time: 2019 Sep 26 1701 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Sep 27: None (Below G1) Sep 28: G2 (Moderate) Sep 29: 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

Space Weather Message Code: WATA30 Serial Number: 181 Issue Time: 2019 Sep 25 1856 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Sep 26: None (Below G1) Sep 27: G1 (Minor) 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: WARK04 Serial Number: 3671 Issue Time: 2019 Sep 24 2256 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3670 Valid From: 2019 Sep 24 1326 UTC Now Valid Until: 2019 Sep 25 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: WATA20 Serial Number: 863 Issue Time: 2019 Sep 24 2048 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Sep 25: None (Below G1) Sep 26: None (Below G1) Sep 27: 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: 2127 Issue Time: 2019 Sep 24 1805 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2019 Sep 24 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: 3670 Issue Time: 2019 Sep 24 1328 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2019 Sep 24 1326 UTC Valid To: 2019 Sep 24 2300 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: 3669 Issue Time: 2019 Sep 24 0317 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2019 Sep 24 0317 UTC Valid To: 2019 Sep 24 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: WARK04 Serial Number: 3668 Issue Time: 2019 Sep 17 2228 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3667 Valid From: 2019 Sep 17 1740 UTC Now Valid Until: 2019 Sep 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: ALTK04 Serial Number: 2126 Issue Time: 2019 Sep 17 2226 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2019 Sep 17 2226 UTC Synoptic Period: 2100-2400 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