"What I was trying, and probably failing, to say was that most commercial users will be making decisions on forecasts for periods considerably longer, or further ahead, than the next few minutes."
Ahh, fair enough. Well, as both a keen ultra-distance race-walker and former Mountain Rescue volunteer I can assure you that the hour-by-hour forecasts are hugely useful. Gave up on the met forecasts 4 or 5 years ago, mind. Nowadays I read the pressure charts & radar to get an idea of where things are and where they are going followed by Accuweather for a pretty good stab at what will happen. Their granularity is also much smaller than the Met (i.e. they claim to offer forecasts for smaller areas) and I usually find them to be spot on.
Not holding out much hope for accuracy this week, though. The pressure charts show the warm front edging back and forth over where I live - which basically means prepare for all types of weather every ten minutes or so.