Evening scores now follow the real sunset
The forecast outlook for the hours around sunset is now worked out from the actual sunset time for that spot on that date, rather than assuming the evening starts at 8pm everywhere. Through the winter this matters most: with the sun going down around 4:45pm, the late-afternoon and early-evening hours — usually the best window of the day for long-distance microwave contacts — were still being shown as if the air was fully mixed by daytime heating, which understated them badly. Those hours now show the cooling, inversion-reforming conditions they really have. Summer evenings behave the same way as before, just shifted later to match the longer day.