Space Weather Alerts, Watches and Warnings
Issue Time: 2017 May 28 1443 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1355
Valid From: 2017 May 27 2204 UTC
Now Valid Until: 2017 May 28 2100 UTC
Warning Condition: Persistence
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: 2017 May 28 1026 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 1020 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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: 2017 May 28 0824 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 28 0823 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 28 0719 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 0718 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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: 2017 May 28 0430 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3224
Valid From: 2017 May 27 1530 UTC
Now Valid Until: 2017 May 29 0000 UTC
Warning Condition: Persistence
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: 2017 May 28 0420 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2017 May 28 0419 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

Issue Time: 2017 May 28 0410 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1354
Valid From: 2017 May 27 2204 UTC
Now Valid Until: 2017 May 28 1500 UTC
Warning Condition: Persistence
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: 2017 May 28 0410 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 386
Valid From: 2017 May 27 2320 UTC
Now Valid Until: 2017 May 28 0900 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 28 0410 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2017 May 28 0409 UTC
Valid To: 2017 May 28 0900 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater - Strong to Extreme
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

Issue Time: 2017 May 28 0350 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 28 0349 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 28 0330 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 0329 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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: 2017 May 28 0225 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 28 0224 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 28 0106 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 0105 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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: 2017 May 27 2323 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 27 2322 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 27 2320 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 May 27 2320 UTC
Valid To: 2017 May 28 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 27 2255 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 27 2255 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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: 2017 May 27 2204 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 May 27 2204 UTC
Valid To: 2017 May 28 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
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: 2017 May 27 2202 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 27 2202 UTC
Synoptic Period: 2100-2400 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: 2017 May 27 2045 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3223
Valid From: 2017 May 27 1530 UTC
Now Valid Until: 2017 May 28 0900 UTC
Warning Condition: Persistence
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: 2017 May 27 1546 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2017 May 27 1536 UTC
Deviation: 19 nT
Station: BOU
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: 2017 May 27 1505 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2017 May 27 1545 UTC
Valid To: 2017 May 27 1630 UTC
IP Shock Passage Observed: 2017 May 27 1446 UTC
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 26 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2606
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 17618 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 25 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2605
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 13965 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 24 0501 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2604
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 9338 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 23 0545 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 23 0544 UTC
Valid To: 2017 May 23 1200 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: 2017 May 23 0536 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2603
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 26098 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 22 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2602
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 13009 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 21 1755 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3220
Valid From: 2017 May 19 1614 UTC
Now Valid Until: 2017 May 22 0300 UTC
Warning Condition: Persistence
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: 2017 May 21 0639 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2601
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 1718 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 20 1720 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 May 20 1705 UTC
Station: GOES13

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 20 1450 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1352
Valid From: 2017 May 20 0729 UTC
Now Valid Until: 2017 May 20 2100 UTC
Warning Condition: Persistence
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: 2017 May 20 0730 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 May 20 0729 UTC
Valid To: 2017 May 20 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
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: 2017 May 20 0241 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3219
Valid From: 2017 May 19 1614 UTC
Now Valid Until: 2017 May 21 1800 UTC
Warning Condition: Persistence
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: 2017 May 20 0240 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 20 0235 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: 2017 May 19 1614 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 19 1614 UTC
Valid To: 2017 May 20 0600 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: 2017 May 18 0139 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 18 0139 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: 2017 May 18 0119 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 18 0115 UTC
Valid To: 2017 May 18 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: 2017 May 17 1752 UTC
WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
May 18: G1 (Minor) May 19: G2 (Moderate) May 20: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 17 1748 UTC
CANCEL WATCH: Geomagnetic Storm Category G2 Predicted
Cancel Serial Number: 158
Original Issue Time: 2017 May 16 2126 UTC
Comment: The G2 (Moderate) Geomagnetic Storm Watch for 17 May 2017 has been canceled. A new Watch product will be issued shortly to update conditions expected 18-20 May 2017
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 16 2126 UTC
WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
May 17: G2 (Moderate) May 18: G2 (Moderate) May 19: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 15 2208 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3216
Valid From: 2017 May 15 0957 UTC
Now Valid Until: 2017 May 16 2100 UTC
Warning Condition: Persistence
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: 2017 May 15 2106 UTC
WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
May 16: G1 (Minor) May 17: G2 (Moderate) May 18: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 15 1152 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 15 1150 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: 2017 May 15 0958 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 15 0957 UTC
Valid To: 2017 May 15 2359 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: 2017 May 14 2027 UTC
WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
May 15: None (Below G1) May 16: G1 (Minor) May 17: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2017 May 13 1929 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
May 14: None (Below G1) May 15: None (Below G1) May 16: G1 (Minor)

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: 2017 May 07 1630 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 May 07 1615 UTC
Station: GOES-13

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 04 2222 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 04 2222 UTC
Synoptic Period: 2100-2400 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: 2017 May 04 2135 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 04 2135 UTC
Valid To: 2017 May 05 0600 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: 2017 May 04 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2598
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 7832 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 03 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2597
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8389 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 02 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2596
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 5370 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 May 01 0501 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2595
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8939 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 Apr 30 0740 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2594
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 15914 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 Apr 29 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2593
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 56297 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
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