Space Weather Message Code: WARK05 Serial Number: 1742 Issue Time: 2023 Feb 16 1116 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1741 Valid From: 2023 Feb 16 0436 UTC Now Valid Until: 2023 Feb 16 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: ALTK05 Serial Number: 1427 Issue Time: 2023 Feb 16 0706 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Feb 16 0700 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: ALTK04 Serial Number: 2342 Issue Time: 2023 Feb 16 0633 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Feb 16 0627 UTC Synoptic Period: 0600-0900 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: 4280 Issue Time: 2023 Feb 16 0440 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4279 Valid From: 2023 Feb 16 0412 UTC Now Valid Until: 2023 Feb 16 1500 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 –

Space Weather Message Code: WARK05 Serial Number: 1741 Issue Time: 2023 Feb 16 0437 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 Feb 16 0436 UTC Valid To: 2023 Feb 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: 4279 Issue Time: 2023 Feb 16 0413 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Feb 16 0412 UTC Valid To: 2023 Feb 16 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: WATA30 Serial Number: 212 Issue Time: 2023 Feb 15 2025 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Feb 16: G1 (Minor) Feb 17: G1 (Minor) Feb 18: 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 Currents

Space Weather Message Code: WARK05 Serial Number: 1740 Issue Time: 2023 Feb 15 1812 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 Feb 15 1810 UTC Valid To: 2023 Feb 16 0300 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: 4278 Issue Time: 2023 Feb 15 1644 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4277 Valid From: 2023 Feb 15 0449 UTC Now Valid Until: 2023 Feb 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: WARK05 Serial Number: 1739 Issue Time: 2023 Feb 15 1139 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1738 Valid From: 2023 Feb 15 0643 UTC Now Valid Until: 2023 Feb 15 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 –