####018000973####
WOXX12 KWNP 170056

ALTK06



Space Weather Message Code: ALTK06

Serial Number: 629

Issue Time: 2025 May 17 0054 UTC



ALERT: Geomagnetic K-index of 6

Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Scale: G2 - Moderate

www.swpc.noaa.gov/noaa-scales-explanation

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.



# Issued by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Recent messages, data, and help at http://swpc.noaa.gov/alerts/

# Send questions to SWPC.Webmaster@noaa.gov

####018000818####
WOXX11 KWNP 170056

ALTK05



Space Weather Message Code: ALTK05

Serial Number: 1770

Issue Time: 2025 May 17 0053 UTC



ALERT: Geomagnetic K-index of 5

Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Scale: G1 - Minor

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.



# Issued by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Recent messages, data, and help at http://swpc.noaa.gov/alerts/

# Send questions to SWPC.Webmaster@noaa.gov