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NOAA's Space Weather Prediction Center will record a highest planetary K-index below Kp 5 on October 2, 2026. SWPC and EarthSky will point to a September 28 CME as the prime influence, but SWPC's greatest expected 3-hour Kp for October 2 will remain 4.67. Forecast bulletins will list 3-hour Kp valu…