Space Weather Message Code: WARK04 Serial Number: 3438 Issue Time: 2018 Mar 15 2040 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3437 Valid From: 2018 Mar 15 1617 UTC Now Valid Until: 2018 Mar 16 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: WARK04 Serial Number: 3437 Issue Time: 2018 Mar 15 1618 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Mar 15 1617 UTC Valid To: 2018 Mar 15 2100 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: WARK05 Serial Number: 1459 Issue Time: 2018 Mar 15 0309 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2018 Mar 15 0308 UTC Valid To: 2018 Mar 15 1200 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: WARK05 Serial Number: 1458 Issue Time: 2018 Mar 15 0308 UTC CANCEL WARNING: Geomagnetic K-index of 5 expected Cancel Serial Number: 1457 Original Issue Time: 2018 Mar 15 0207 UTC Comment: This warning will be corrected/re-issued to reflect an ending valid time of 15/1200 UTC. 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

Space Weather Message Code: WARK05 Serial Number: 1457 Issue Time: 2018 Mar 15 0207 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2018 Mar 15 0210 UTC Valid To: 2018 Mar 15 1500 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: 2041 Issue Time: 2018 Mar 15 0006 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Mar 14 2359 UTC Synoptic Period: 2100-0000 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: 3436 Issue Time: 2018 Mar 14 2215 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Mar 14 2215 UTC Valid To: 2018 Mar 15 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: WARK05 Serial Number: 1456 Issue Time: 2018 Mar 14 1728 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2018 Mar 14 1726 UTC Valid To: 2018 Mar 14 2100 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: 2040 Issue Time: 2018 Mar 14 1723 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Mar 14 1723 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: 3435 Issue Time: 2018 Mar 14 1435 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Mar 14 1435 UTC Valid To: 2018 Mar 14 2100 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