Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Patriot Coal (NYSE: PCX) are down 10% today after the company said it was cutting back production.

So what: Two of the company's production units and three contractor-operated mines are being shut down due to low demand for metallurgical coal. The company didn't specify how much production would be cut, only that low export levels are leading to the cuts.

Now what: Patriot Coal expects to bring production back online in the future, but no timetable was given. Slowing growth in China and increased production in Australia have led to the low demand, but management expects demand to come back once the global economy returns to a more normal growth pattern. Since no one knows when that will happen it's tough to say exactly what the effect will be for Patriot Coal.

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