Space Weather Alerts, Watches and Warnings
Issue Time: 2021 Jul 28 1922 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2021 Jul 28 1922 UTC
Valid To: 2021 Jul 29 0300 UTC
Warning Condition: Onset
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.

Issue Time: 2021 Jul 28 0219 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2021 Jul 28 0218 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
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.

Issue Time: 2021 Jul 28 0118 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2021 Jul 28 0117 UTC
Valid To: 2021 Jul 28 0900 UTC
Warning Condition: Onset
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.

Issue Time: 2021 Jul 25 0611 UTC
ALERT: Type II Radio Emission
Begin Time: 2021 Jul 25 0452 UTC
Estimated Velocity: 263 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.

Issue Time: 2021 Jul 24 0219 UTC
ALERT: Type II Radio Emission
Begin Time: 2021 Jul 24 0010 UTC
Estimated Velocity: 554 km\/s

Comment: Velocity values provided by the U.S. Air Force.
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.

Issue Time: 2021 Jul 22 0901 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2021 Jul 22 0900 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
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.

Issue Time: 2021 Jul 22 0852 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2021 Jul 22 0851 UTC
Valid To: 2021 Jul 22 1500 UTC
Warning Condition: Onset
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.

Issue Time: 2021 Jul 21 2029 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jul 22: None (Below G1) Jul 23: G1 (Minor) Jul 24: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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.

Issue Time: 2021 Jul 17 0608 UTC
ALERT: Type II Radio Emission
Begin Time: 2021 Jul 17 0510 UTC
Estimated Velocity: 439 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.

Issue Time: 2021 Jul 14 1641 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2021 Jul 14 1631 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: No
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.

Issue Time: 2021 Jul 14 1639 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2021 Jul 14 1639 UTC
Valid To: 2021 Jul 15 0300 UTC
Warning Condition: Onset
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.

Issue Time: 2021 Jul 09 1203 UTC
ALERT: Type II Radio Emission
Begin Time: 2021 Jul 09 1048 UTC
Estimated Velocity: 745 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.

Issue Time: 2021 Jul 03 1624 UTC
ALERT: Type II Radio Emission
Begin Time: 2021 Jul 03 1437 UTC
Estimated Velocity: 357 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.

Issue Time: 2021 Jul 03 1500 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2021 Jul 03 1418 UTC
Maximum Time: 2021 Jul 03 1429 UTC
End Time: 2021 Jul 03 1434 UTC
X-ray Class: X1.5
Optical Class: sf
Location: N25W86
NOAA Scale: R3 - Strong
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.

Issue Time: 2021 Jul 03 1434 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2021 Jul 03 1427 UTC
NOAA Scale: R2 - Moderate
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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