This is the Method approach - doing the forecast in the weather, presumably to give his analysis even more authority.
And what does the forecast see going forward?
But anyone who did the forecast with Sea The Stars must have felt very clever indeed.
So did the forecast for the global economy: slower but still rapid growth, with emerging markets leading the way.
"In order to do the forecast we need to know what the current weather conditions are," he says.
But take a step back, examine these two graphs and ask yourself: on the evidence of the past (the stuff to the left of the dotted line), do the forecasts (the stuff to the right) strike you as solid?
Wealth remains preferable to poverty and the queues for the iPad2 show the continuing appeal of new things, as do the forecasts that by mid-century the roads of India and China will, between them, be making room for 800 million cars.
The IMF recently projected losses for American banks over the same period would be $550 billion.Yet if the loss estimates look reasonable, as do the forecasts of the underlying earnings the banks will make, has the hurdle for capital been set too low?
What is the company doing to get through the recession, how do things look, what does the forecast look like?
"And the reason, of course, is because I didn't do the forecast," he said, referring to his recent foray into weather presenting, in a special BBC broadcast.
Other analysts have done the same, forecasting 2009 growth of 7.0% to 7.5%, compared with previous estimates of 5.5% to 6.5%.
