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Space Weather Message Code: WARK05
Serial Number: 2042
Issue Time: 2025 May 15 0509 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 May 15 0508 UTC
Valid To: 2025 May 15 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 grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
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Space Weather Message Code: WARK04
Serial Number: 4965
Issue Time: 2025 May 15 0509 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4964
Valid From: 2025 May 15 0332 UTC
Now Valid Until: 2025 May 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 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
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Space Weather Message Code: ALTK04
Serial Number: 2559
Issue Time: 2025 May 15 0349 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 May 15 0345 UTC
Synoptic Period: 0300-0600 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 visible at high latitudes such as Canada and Alaska.
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Space Weather Message Code: WARK04
Serial Number: 4964
Issue Time: 2025 May 15 0333 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 May 15 0332 UTC
Valid To: 2025 May 15 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 - Aurora may be visible at high latitudes such as Canada and Alaska.
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Space Weather Message Code: ALTK04
Serial Number: 2558
Issue Time: 2025 May 14 1803 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 May 14 1755 UTC
Synoptic Period: 1500-1800 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 visible at high latitudes such as Canada and Alaska.
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Space Weather Message Code: WARK04
Serial Number: 4963
Issue Time: 2025 May 14 1803 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 May 14 1730 UTC
Valid To: 2025 May 15 0000 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 - Aurora may be visible at high latitudes such as Canada and Alaska.
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Space Weather Message Code: SUMXM5
Serial Number: 289
Issue Time: 2025 May 14 1136 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 May 14 1104 UTC
Maximum Time: 2025 May 14 1119 UTC
End Time: 2025 May 14 1131 UTC
X-ray Class: M7
Optical Class: na
Location: N15E58
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential 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.
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Space Weather Message Code: ALTXMF
Serial Number: 482
Issue Time: 2025 May 14 1117 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 May 14 1115 UTC
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential 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.
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Space Weather Message Code: SUMX01
Serial Number: 193
Issue Time: 2025 May 14 0839 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 May 14 0804 UTC
Maximum Time: 2025 May 14 0825 UTC
End Time: 2025 May 14 0831 UTC
X-ray Class: X2.7
Optical Class: 2b
Location: N15E60
NOAA Scale: R3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential 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.
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Space Weather Message Code: SUM10R
Serial Number: 865
Issue Time: 2025 May 14 0830 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2025 May 14 0817 UTC
Maximum Time: 2025 May 14 0818 UTC
End Time: 2025 May 14 0818 UTC
Duration: 1 minutes
Peak Flux: 390 sfu
Latest Penticton Noon Flux: 117 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
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Space Weather Message Code: ALTXMF
Serial Number: 481
Issue Time: 2025 May 14 0819 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 May 14 0817 UTC
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential 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.
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Space Weather Message Code: ALTTP2
Serial Number: 1413
Issue Time: 2025 May 14 0420 UTC
ALERT: Type II Radio Emission
Begin Time: 2025 May 14 0323 UTC
Estimated Velocity: 238 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
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Space Weather Message Code: SUMXM5
Serial Number: 288
Issue Time: 2025 May 14 0345 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 May 14 0305 UTC
Maximum Time: 2025 May 14 0325 UTC
End Time: 2025 May 14 0335 UTC
X-ray Class: M5.3
Location: N17E65
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential 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.
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Space Weather Message Code: ALTXMF
Serial Number: 480
Issue Time: 2025 May 14 0325 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 May 14 0323 UTC
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential 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.
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Space Weather Message Code: WARK04
Serial Number: 4962
Issue Time: 2025 May 14 0057 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 May 14 0058 UTC
Valid To: 2025 May 14 1200 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 - Aurora may be visible at high latitudes such as Canada and Alaska.
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Space Weather Message Code: WARPX1
Serial Number: 601
Issue Time: 2025 May 13 1852 UTC
WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2025 May 13 1930 UTC
Valid To: 2025 May 14 1200 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
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Space Weather Message Code: SUM10R
Serial Number: 864
Issue Time: 2025 May 13 1613 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2025 May 13 1534 UTC
Maximum Time: 2025 May 13 1534 UTC
End Time: 2025 May 13 1535 UTC
Duration: 1 minutes
Peak Flux: 220 sfu
Latest Penticton Noon Flux: 116 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
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Space Weather Message Code: ALTTP2
Serial Number: 1412
Issue Time: 2025 May 13 1607 UTC
ALERT: Type II Radio Emission
Begin Time: 2025 May 13 1542 UTC
Estimated Velocity: 658 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
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Space Weather Message Code: SUMX01
Serial Number: 192
Issue Time: 2025 May 13 1552 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 May 13 1525 UTC
Maximum Time: 2025 May 13 1538 UTC
End Time: 2025 May 13 1544 UTC
X-ray Class: X1.2
Optical Class: 1b
Location: N08W90
NOAA Scale: R3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential 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.
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Space Weather Message Code: ALTXMF
Serial Number: 479
Issue Time: 2025 May 13 1537 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 May 13 1535 UTC
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential 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.
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https://www.swpc.noaa.gov/products/alerts-watches-and-warnings