Space Weather Message Code: WARK04 Serial Number: 4393 Issue Time: 2023 Jun 01 0853 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4392 Valid From: 2023 Jun 01 0116 UTC Now Valid Until: 2023 Jun 01 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: ALTK04 Serial Number: 2376 Issue Time: 2023 Jun 01 0247 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Jun 01 0245 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: 4392 Issue Time: 2023 Jun 01 0115 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Jun 01 0116 UTC Valid To: 2023 Jun 01 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: WATA20 Serial Number: 950 Issue Time: 2023 May 30 2047 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: May 31: None (Below G1) Jun 01: None (Below G1) Jun 02: 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: 4391 Issue Time: 2023 May 25 2057 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4390 Valid From: 2023 May 25 0200 UTC Now Valid Until: 2023 May 26 0900 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: 4390 Issue Time: 2023 May 25 1456 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4389 Valid From: 2023 May 25 0200 UTC Now Valid Until: 2023 May 25 2100 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: 4389 Issue Time: 2023 May 25 0832 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4388 Valid From: 2023 May 25 0200 UTC Now Valid Until: 2023 May 25 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: WARK04 Serial Number: 4388 Issue Time: 2023 May 25 0200 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 May 25 0200 UTC Valid To: 2023 May 25 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: WARK04 Serial Number: 4387 Issue Time: 2023 May 24 0255 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4386 Valid From: 2023 May 23 2220 UTC Now Valid Until: 2023 May 24 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: 2375 Issue Time: 2023 May 23 2259 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 May 23 2258 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