Space Weather Message Code: WATA20 Serial Number: 860 Issue Time: 2019 Aug 02 1339 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Aug 03: None (Below G1) Aug 04: None (Below G1) Aug 05: 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: 3647 Issue Time: 2019 Jul 30 2331 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3646 Valid From: 2019 Jul 30 1605 UTC Now Valid Until: 2019 Jul 31 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: WARK04 Serial Number: 3646 Issue Time: 2019 Jul 30 1606 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2019 Jul 30 1605 UTC Valid To: 2019 Jul 30 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: 3645 Issue Time: 2019 Jul 21 2308 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2019 Jul 21 2307 UTC Valid To: 2019 Jul 22 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: 3644 Issue Time: 2019 Jul 11 0828 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2019 Jul 11 0830 UTC Valid To: 2019 Jul 11 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: WARK04 Serial Number: 3643 Issue Time: 2019 Jul 10 1132 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3642 Valid From: 2019 Jul 09 1830 UTC Now Valid Until: 2019 Jul 10 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: ALTK05 Serial Number: 1267 Issue Time: 2019 Jul 10 0727 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2019 Jul 10 0726 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: WARK05 Serial Number: 1525 Issue Time: 2019 Jul 10 0522 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2019 Jul 10 0521 UTC Valid To: 2019 Jul 10 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: 3642 Issue Time: 2019 Jul 10 0254 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3641 Valid From: 2019 Jul 09 1830 UTC Now Valid Until: 2019 Jul 10 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: ALTK05 Serial Number: 1266 Issue Time: 2019 Jul 09 2029 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2019 Jul 09 2028 UTC Synoptic Period: 1800-2100 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.