Though since the timeframe is "week" you have to say the floods for immediate impact.
Also, consider the following, which I submit for discussion without endorsing or rejecting:
http://cryptogon.com/?p=2753#commentsThe Best Farmland in the U.S. Is Flooded; Most Americans Are Too Stupid to Panic
June 19th, 2008
The best commentary I could offer is a link to a previous story:
World’s Largest Maker of Crop Nutrients: Famines May Occur Without Record Harvests
But I’ll ramble on a bit more about this, anyway.
As soon as I became aware of the flooding situation in the American Midwest, I posted the story with the EMERGENCY prefix on the title. Just so we’re clear, when I write EMERGENCY at the beginning of a post title, this is my way of indicating that the situation is as serious as it gets. It means that I feel as though everyone reading should consider taking immediate evasive action. All the jawboning about conspiracy, how things could have been, how things should be, etc. are behind us now. You know, EMERGENCY, act fast, eyes wide, nostrils flared, etc.
While the food supply situation has skated along a knife edge so far this year, with higher prices and many countries experiencing food riots, widespread famine did not take hold. In an incredible move, the Japanese quietly eased rice shortages by releasing portions of their imported rice stockpiles—from giant warehouses in Tokyo—into the system; a welcome but one off blip in the big picture. What happens next time?
Now, this growing season, when yields need to be at record levels to avert disaster, what do we find? Floods or droughts in several of the breadbaskets of the world.
Whatever your plans are, I hope that you’re ready to execute them (or, better yet, are executing them). I’m pretty sure that most people have done nothing, and I don’t know why this continues to amaze me.