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Comment by 8bitsrule

12 hours ago

G4: " Induced pipeline currents affect preventive measures, HF radio propagation sporadic..."

G5: " Pipeline currents can reach hundreds of amps, HF (high frequency) radio propagation may be impossible in many areas for one to two days..."

"Cool! What's G13 do?" - Bill Hicks

Looks like G5 is the highest level and the scale system is used by NOAA.

  • >"Cool! What's G13 do?" - Bill Hicks

    I hear that bit in my head every time a new plane or weapon designation is announced, glad to hear it stuck with others too.

HF propagation is flaky at the best of times. It's affected by the day/night cycle and by the weather.