Space Weather Message Code: ALTK04 Serial Number: 1955 Issue Time: 2017 Feb 22 0240 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Feb 22 0239 UTC Synoptic Period: 0000-0300 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: 3141 Issue Time: 2017 Feb 22 0122 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Feb 22 0122 UTC Valid To: 2017 Feb 22 0700 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: 769 Issue Time: 2017 Feb 20 2055 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Feb 21: None (Below G1) Feb 22: None (Below G1) Feb 23: 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: WARK04 Serial Number: 3140 Issue Time: 2017 Feb 20 1915 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Feb 20 1914 UTC Valid To: 2017 Feb 20 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: 3139 Issue Time: 2017 Feb 20 0516 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Feb 20 0515 UTC Valid To: 2017 Feb 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: WARK04 Serial Number: 3138 Issue Time: 2017 Feb 19 0857 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3137 Valid From: 2017 Feb 19 0000 UTC Now Valid Until: 2017 Feb 19 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: WARK04 Serial Number: 3137 Issue Time: 2017 Feb 19 0005 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Feb 19 0000 UTC Valid To: 2017 Feb 19 0900 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: 1308 Issue Time: 2017 Feb 18 0359 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2017 Feb 18 0357 UTC Valid To: 2017 Feb 18 0900 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: 3135 Issue Time: 2017 Feb 17 2312 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3134 Valid From: 2017 Feb 17 1749 UTC Now Valid Until: 2017 Feb 18 0700 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: 1954 Issue Time: 2017 Feb 17 1803 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Feb 17 1759 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