How to read the charts

The chart shows the best frequency to use if working from the UK to each area. The dark green (squares) plot shows the optimum frequency and the light green plot shows the next best frequency to use. The dark green blob plot shows the reliability of the path as a percentage that it is likely to be open.These are based on CW, 100W, dipole to dipole and a "fair" reception. Adjust the reliability according to your own station.

For more general charts see http://www.infotechcomms.net/propcharts/

West Coast USA

Reliability/Band graph produced by WinCap Wizard/VOACAP
This shows that to work the West Coast USA from the UK, 20m (14 MHz) or
17m, (18MHz) are your best bets. The reliability improves to around 11% around 5pm.
This is a tough path but 5pm - 7/8pm on 20m would be where my money is.
Knowing K6KPH this would be CW only if they are on.