Local 6/3/2026, 2:52:28 PM
UTC 2026-06-03T14:52:28.343Z
Space Weather Message Code: WATA50Serial Number: 98Issue Time: 2026 Jun 03 1452 UTCWATCH: Geomagnetic Storm Category G3 Predicted Highest Storm Level Predicted by Day: Jun 04: G3 (Strong) Jun 05: G3 (Strong) Jun 06: None (Below G1) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT Comment:
Local 6/3/2026, 11:59:48 AM
UTC 2026-06-03T11:59:48.137Z
Space Weather Message Code: SUMX01Serial Number: 218Issue Time: 2026 Jun 03 1159 UTCSUMMARY: X-ray Event exceeded X1 Begin Time: 2026 Jun 03 1119 UTC Maximum Time: 2026 Jun 03 1128 UTC End Time: 2026 Jun 03 1135 UTC Xray Class: X1.0 Optical Class: Location: N17W19 Noaa Scale: R3 - Strong Comment: GOES-18 outage so using GOES-19GOES-18 outage so using GOES-19NOAA Scale: R3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
Local 6/3/2026, 11:47:26 AM
UTC 2026-06-03T11:47:26.383Z
Space Weather Message Code: SUM10RSerial Number: 917Issue Time: 2026 Jun 03 1147 UTCSUMMARY: 10cm Radio Burst Begin Time: 2026 Jun 03 1121 UTC Maximum Time: 2026 Jun 03 1122 UTC End Time: 2026 Jun 04 1123 UTC Peak Flux: 250 sfu Duration: 2 minutes Latest Penticton Noon Flux: 146 sfu Comment:
Local 6/3/2026, 11:41:23 AM
UTC 2026-06-03T11:41:23.617Z
Space Weather Message Code: ALTXMFSerial Number: 531Issue Time: 2026 Jun 03 1141 UTCALERT: X-Ray Flux exceeded M5 Threshold Reached: 2026 Jun 03 1141 UTC Noaa Scale: R2 - Moderate Comment:NOAA Scale: R2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
Local 6/3/2026, 7:29:03 AM
UTC 2026-06-03T07:29:03.520Z
Space Weather Message Code: ALTTP2Serial Number: 1497Issue Time: 2026 Jun 03 0729 UTCALERT: Type II Radio Emission Begin Time: 2026 Jun 03 0657 UTC Estimate Velocity: 313 km/s Comment:
Local 6/3/2026, 7:17:27 AM
UTC 2026-06-03T07:17:27.647Z
Space Weather Message Code: SUM10RSerial Number: 916Issue Time: 2026 Jun 03 0717 UTCSUMMARY: 10cm Radio Burst Begin Time: 2026 Jun 03 0657 UTC Maximum Time: 2026 Jun 03 0657 UTC End Time: 2026 Jun 03 0700 UTC Peak Flux: 540 sfu Duration: 3 minutes Latest Penticton Noon Flux: 146 sfu Comment: Castelli-U signature. Corrected duration.Castelli-U signature. Corrected duration.
Local 6/3/2026, 7:15:26 AM
UTC 2026-06-03T07:15:26.817Z
Space Weather Message Code: SUMXM5Serial Number: 318Issue Time: 2026 Jun 03 0715 UTCSUMMARY: X-ray Event exceeded M5 Begin Time: 2026 Jun 03 0648 UTC Maximum Time: 2026 Jun 03 0700 UTC End Time: 2026 Jun 03 0707 UTC Xray Class: M7.7 Optical Class: 2B Location: N08W14 Noaa Scale: R2 - Moderate Comment:NOAA Scale: R2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.
Local 6/3/2026, 7:10:30 AM
UTC 2026-06-03T07:10:30.770Z
Space Weather Message Code: SUM10RSerial Number: 916Issue Time: 2026 Jun 03 0710 UTCSUMMARY: 10cm Radio Burst Begin Time: 2026 Jun 03 0657 UTC Maximum Time: 2026 Jun 03 0657 UTC End Time: 2026 Jun 03 0658 UTC Peak Flux: 540 sfu Duration: 1 minutes Latest Penticton Noon Flux: 146 sfu Comment: Castelli-U signatureCastelli-U signature
Local 6/3/2026, 7:00:49 AM
UTC 2026-06-03T07:00:49.110Z
Space Weather Message Code: ALTXMFSerial Number: 530Issue Time: 2026 Jun 03 0700 UTCALERT: X-Ray Flux exceeded M5 Threshold Reached: 2026 Jun 03 0700 UTC Noaa Scale: R2 - Moderate Comment:NOAA Scale: R2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
Local 6/3/2026, 2:15:54 AM
UTC 2026-06-03T02:15:54.083Z
Space Weather Message Code: SUM10RSerial Number: 915Issue Time: 2026 Jun 03 0215 UTCSUMMARY: 10cm Radio Burst Begin Time: 2026 Jun 03 0126 UTC Maximum Time: 2026 Jun 03 0130 UTC End Time: 2026 Jun 04 0131 UTC Peak Flux: 360 sfu Duration: 5 minutes Latest Penticton Noon Flux: 146 sfu Comment:
Local 6/3/2026, 1:56:39 AM
UTC 2026-06-03T01:56:39.910Z
Space Weather Message Code: SUMXM5Serial Number: 317Issue Time: 2026 Jun 03 0156 UTCSUMMARY: X-ray Event exceeded M5 Begin Time: 2026 Jun 03 0122 UTC Maximum Time: 2026 Jun 03 0136 UTC End Time: 2026 Jun 04 0143 UTC Xray Class: M9.3 Optical Class: sf Location: N13W05 Noaa Scale: R2 - Moderate Comment:NOAA Scale: R2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.
Local 6/3/2026, 1:43:20 AM
UTC 2026-06-03T01:43:20.793Z
Space Weather Message Code: ALTTP4Serial Number: 710Issue Time: 2026 Jun 03 0143 UTCALERT: Type IV Radio Emission Begin Time: 2026 Jun 03 0122 UTC Comment:
Local 6/3/2026, 1:42:23 AM
UTC 2026-06-03T01:42:23.620Z
Space Weather Message Code: ALTTP2Serial Number: 1496Issue Time: 2026 Jun 03 0142 UTCALERT: Type II Radio Emission Begin Time: 2026 Jun 03 0057 UTC Estimate Velocity: 253 km/s Comment:
Local 6/3/2026, 1:37:19 AM
UTC 2026-06-03T01:37:19.567Z
Space Weather Message Code: ALTXMFSerial Number: 529Issue Time: 2026 Jun 03 0137 UTCALERT: X-Ray Flux exceeded M5 Threshold Reached: 2026 Jun 03 0131 UTC Noaa Scale: R2 - Moderate Comment:NOAA Scale: R2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
Local 6/2/2026, 5:18:10 PM
UTC 2026-06-02T17:18:10.143Z
Space Weather Message Code: ALTTP2Serial Number: 1495Issue Time: 2026 Jun 02 1718 UTCALERT: Type II Radio Emission Begin Time: 2026 Jun 02 1652 UTC Estimate Velocity: 631 km/s Comment: Uncertain if the sweep was associated with a limb event or an M3 solar flare that occurred at similar times.Uncertain if the sweep was associated with a limb event or an M3 solar flare that occurred at similar times.
Local 6/2/2026, 4:57:35 PM
UTC 2026-06-02T16:57:35.033Z
Space Weather Message Code: SUM10RSerial Number: 914Issue Time: 2026 Jun 02 1657 UTCSUMMARY: 10cm Radio Burst Begin Time: 2026 Jun 02 1642 UTC Maximum Time: 2026 Jun 02 1642 UTC End Time: 2026 Jun 02 1643 UTC Peak Flux: 150 sfu Duration: 1 minutes Latest Penticton Noon Flux: 137 sfu Comment: COR for end date. Event only lasted 1 minute.COR for end date. Event only lasted 1 minute.
Local 6/2/2026, 4:54:51 PM
UTC 2026-06-02T16:54:51.000Z
Space Weather Message Code: SUM10RSerial Number: 914Issue Time: 2026 Jun 02 1654 UTCSUMMARY: 10cm Radio Burst Begin Time: 2026 Jun 02 1642 UTC Maximum Time: 2026 Jun 02 1642 UTC End Time: 2026 Jun 03 1643 UTC Peak Flux: 150 sfu Duration: 1 minutes Latest Penticton Noon Flux: 137 sfu Comment: