Space Weather Message Code: ALTK04 Serial Number: 2043 Issue Time: 2018 Mar 18 1630 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Mar 18 1630 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: 3444 Issue Time: 2018 Mar 18 1429 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Mar 18 1430 UTC Valid To: 2018 Mar 18 2359 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: 3443 Issue Time: 2018 Mar 17 2229 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Mar 17 2230 UTC Valid To: 2018 Mar 18 0300 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: 3442 Issue Time: 2018 Mar 17 0524 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3441 Valid From: 2018 Mar 15 1617 UTC Now Valid Until: 2018 Mar 17 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: WARK05 Serial Number: 1461 Issue Time: 2018 Mar 17 0138 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2018 Mar 17 0136 UTC Valid To: 2018 Mar 17 0600 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: WARK04 Serial Number: 3441 Issue Time: 2018 Mar 16 1723 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3440 Valid From: 2018 Mar 15 1617 UTC Now Valid Until: 2018 Mar 17 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: WARK04 Serial Number: 3440 Issue Time: 2018 Mar 16 1148 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3439 Valid From: 2018 Mar 15 1617 UTC Now Valid Until: 2018 Mar 16 1800 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: 1460 Issue Time: 2018 Mar 16 0501 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2018 Mar 16 0500 UTC Valid To: 2018 Mar 16 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: WARK04 Serial Number: 3439 Issue Time: 2018 Mar 16 0207 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3438 Valid From: 2018 Mar 15 1617 UTC Now Valid Until: 2018 Mar 16 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: ALTK04 Serial Number: 2042 Issue Time: 2018 Mar 15 2358 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Mar 15 2356 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