You can gauge the impact of a change in forecasts on our estimate, by modifying the charts above.

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Many analysts are taking a very bullish take on crude oil prices in 2011 making our forecasts appear conservative.

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The private-sector economists who provide The Economist each month with forecasts for the big economies (published on our indicator pages) are allowed no such luxury.

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"When we started developing the app, we set out to take our users on a journey throughout their day as they check their hourly, daily, and future forecasts, " said Pascal Racheneur, Vice President of Interactive Media for AccuWeather.

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However, if costs are passed on to customers in the form of higher prices for coffee beverages at stores, we believe it may impact our forecasts for average spend per customer visit.

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