Space Weather Message Code: WATA30 Serial Number: 179 Issue Time: 2019 May 14 1838 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: May 15: G1 (Minor) May 16: G2 (Moderate) May 17: 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: WARK04 Serial Number: 3630 Issue Time: 2019 May 14 1448 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3629 Valid From: 2019 May 14 0132 UTC Now Valid Until: 2019 May 14 2359 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: ALTK07 Serial Number: 114 Issue Time: 2019 May 14 0901 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2019 May 14 0859 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Scale: G3 – Strong NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude. Induced Currents – Power system voltage irregularities possible, false

Space Weather Message Code: WARK07 Serial Number: 76 Issue Time: 2019 May 14 0840 UTC WARNING: Geomagnetic K-index of 7 or greater expected Valid From: 2019 May 14 0839 UTC Valid To: 2019 May 14 1200 UTC Warning Condition: Onset NOAA Scale: G3 or greater – Strong to Extreme NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic

Space Weather Message Code: ALTK07 Serial Number: 114 Issue Time: 2019 May 14 0901 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2019 May 14 0859 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Scale: G3 – Strong NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude. Induced Currents – Power system voltage irregularities possible, false

Space Weather Message Code: WARK07 Serial Number: 76 Issue Time: 2019 May 14 0840 UTC WARNING: Geomagnetic K-index of 7 or greater expected Valid From: 2019 May 14 0839 UTC Valid To: 2019 May 14 1200 UTC Warning Condition: Onset NOAA Scale: G3 or greater – Strong to Extreme NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic

Space Weather Message Code: ALTK06 Serial Number: 472 Issue Time: 2019 May 14 0736 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2019 May 14 0736 UTC Synoptic Period: 0600-0900 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: ALTK05 Serial Number: 1264 Issue Time: 2019 May 14 0724 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2019 May 14 0724 UTC Synoptic Period: 0600-0900 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: 471 Issue Time: 2019 May 14 0545 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2019 May 14 0545 UTC Synoptic Period: 0300-0600 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: WARK06 Serial Number: 430 Issue Time: 2019 May 14 0520 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2019 May 14 0521 UTC Valid To: 2019 May 14 1200 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