Space Weather Message Code: WATA20 Serial Number: 822 Issue Time: 2018 Mar 22 1743 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 23: None (Below G1) Mar 24: G1 (Minor) Mar 25: 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: WATA20 Serial Number: 821 Issue Time: 2018 Mar 22 1327 UTC CANCEL WATCH: Geomagnetic Storm Category G1 Predicted Cancel Serial Number: 820 Original Issue Time: 2018 Mar 19 1946 UTC Comment: Current solar wind conditions no longer meet watch criteria. 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

Space Weather Message Code: WARK04 Serial Number: 3446 Issue Time: 2018 Mar 20 0416 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Mar 20 0415 UTC Valid To: 2018 Mar 20 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: WATA20 Serial Number: 820 Issue Time: 2018 Mar 19 1946 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 20: None (Below G1) Mar 21: None (Below G1) Mar 22: 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: ALTK05 Serial Number: 1211 Issue Time: 2018 Mar 19 0207 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2018 Mar 19 0202 UTC Synoptic Period: 0000-0300 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: ALTK06 Serial Number: 459 Issue Time: 2018 Mar 18 2200 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2018 Mar 18 2159 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G2 – Moderate 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 – Power grid fluctuations can occur. High-latitude

Space Weather Message Code: WARK05 Serial Number: 1463 Issue Time: 2018 Mar 18 2141 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1462 Valid From: 2018 Mar 18 2047 UTC Now Valid Until: 2018 Mar 19 0600 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1210 Issue Time: 2018 Mar 18 2136 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2018 Mar 18 2136 UTC Synoptic Period: 2100-2400 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: ALTK05 Serial Number: 1209 Issue Time: 2018 Mar 18 2052 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2018 Mar 18 2052 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: 1462 Issue Time: 2018 Mar 18 2047 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2018 Mar 18 2047 UTC Valid To: 2018 Mar 18 2359 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