Umbrella today? Is an American site that shows a superb example of JustEnoughTechnology.
Why is it so good? Because it answers a simple question in a simple way. In the U.K we have the Government funded Met. Office who managed to extract funding for an enormous amount of computing power and justify this expense by issuing very serious and very comprehensive weather forecasts. There are several ways of letting this information trickle down to the consumer, generally involving chunky toddler graphics , like here or skinny young ladies (look for yourself, what else is Google search for).
In contrast Umbrella Today just sends you a text with exactly the correct amount of detail. I'm looking forward to a U.K version. I can live without the "like totally the simplest..." quote