HF Radio Propagation Conditions Generated: Friday, April 17, 2026 23:30 UTC ---------------------------------------- Current Conditions ---------------------------------------- SFI: 107 SFU [Good] K-index: 1.67 [Excellent] Previous K: 0.67 HF Recommendation ----------------- Good: 15m/20m good, 40m stable ---------------------------------------- NOAA Space Weather Scales ---------------------------------------- Geomagnetic Storm (G): G0 [Quiet] Solar Radiation (S): S0 [Normal] Radio Blackout (R): R0 [Normal] ---------------------------------------- Solar Flare Probabilities (24hr) ---------------------------------------- M-Class Flare: 35% X-Class Flare: 5% ---------------------------------------- Quick Reference ---------------------------------------- SFI: >150 Excellent >120 Very Good >100 Good >80 Fair <80 Poor K: 0-1 Excellent 2 Good 3 Fair 4 Poor 5+ Storm Low K + High SFI = Best HF conditions ---------------------------------------- NOAA Space Weather Prediction Center: https://www.swpc.noaa.gov Current K-Index: https://www.swpc.noaa.gov/products/planetary-k-index