Space Weather Message Code: ALTK04 Serial Number: 2457 Issue Time: 2024 Jul 26 0121 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2024 Jul 26 0120 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: 4646 Issue Time: 2024 Jul 25 2015 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2024 Jul 25 2015 UTC Valid To: 2024 Jul 26 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: WARSUD Serial Number: 231 Issue Time: 2024 Jul 25 1351 UTC WARNING: Geomagnetic Sudden Impulse expected Valid From: 2024 Jul 25 1348 UTC Valid To: 2024 Jul 25 1425 UTC IP Shock Passage Observed: 2024 Jul 25 1315 UTC NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation

Space Weather Message Code: WATA20 Serial Number: 1006 Issue Time: 2024 Jul 24 1819 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Jul 25: None (Below G1) Jul 26: None (Below G1) Jul 27: 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: 4645 Issue Time: 2024 Jul 22 1140 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2024 Jul 22 1139 UTC Valid To: 2024 Jul 22 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 – Weak power grid fluctuations can occur. Aurora

Space Weather Message Code: WATA30 Serial Number: 235 Issue Time: 2024 Jul 22 0626 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Jul 22: None (Below G1) Jul 23: None (Below G1) Jul 24: 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.

Space Weather Message Code: WATA20 Serial Number: 1005 Issue Time: 2024 Jul 21 1805 UTC CANCEL WATCH: Geomagnetic Storm Category G1 Predicted Cancel Serial Number: 1004 Original Issue Time: 2024 Jul 18 1845 UTC Comment: G1 (Minor) conditions are no longer anticipated. 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

Space Weather Message Code: WATA20 Serial Number: 1004 Issue Time: 2024 Jul 18 1845 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Jul 19: None (Below G1) Jul 20: None (Below G1) Jul 21: 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: WATA20 Serial Number: 1003 Issue Time: 2024 Jul 11 0005 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Jul 12: None (Below G1) Jul 13: G1 (Minor) Jul 14: 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. Induced

Space Weather Message Code: WATA20 Serial Number: 1002 Issue Time: 2024 Jul 01 1826 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Jul 02: None (Below G1) Jul 03: G1 (Minor) Jul 04: None (Below G1) 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.