Space Weather Message Code: WATA30 Serial Number: 150 Issue Time: 2017 Mar 25 1515 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Mar 26: None (Below G1) Mar 27: G1 (Minor) Mar 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: WATA20 Serial Number: 778 Issue Time: 2017 Mar 24 1425 UTC CANCEL WATCH: Geomagnetic Storm Category G1 Predicted Cancel Serial Number: 777 Original Issue Time: 2017 Mar 23 2000 UTC Comment: G1 (Minor) geomagnetic storms conditions are no longer anticipated. 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: WATA20 Serial Number: 777 Issue Time: 2017 Mar 23 2000 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 24: G1 (Minor) Mar 25: None (Below G1) Mar 26: None (Below G1) 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: 3176 Issue Time: 2017 Mar 23 0555 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3175 Valid From: 2017 Mar 21 0605 UTC Now Valid Until: 2017 Mar 23 1200 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: ALTK05 Serial Number: 1076 Issue Time: 2017 Mar 23 0004 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Mar 22 2359 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: WARK05 Serial Number: 1326 Issue Time: 2017 Mar 22 2039 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1325 Valid From: 2017 Mar 21 1608 UTC Now Valid Until: 2017 Mar 23 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK04 Serial Number: 3175 Issue Time: 2017 Mar 22 1447 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3174 Valid From: 2017 Mar 21 0605 UTC Now Valid Until: 2017 Mar 23 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 65 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK05 Serial Number: 1324 Issue Time: 2017 Mar 22 1055 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1323 Valid From: 2017 Mar 21 1608 UTC Now Valid Until: 2017 Mar 22 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK04 Serial Number: 3173 Issue Time: 2017 Mar 22 0252 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3172 Valid From: 2017 Mar 21 0605 UTC Now Valid Until: 2017 Mar 22 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: WARK06 Serial Number: 371 Issue Time: 2017 Mar 21 2016 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2017 Mar 21 2015 UTC Valid To: 2017 Mar 21 2359 UTC Warning Condition: Onset 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