Investors buoyed by the recent spate of good economic news shouldn't be breathing easier just yet. There is still plenty of negative data to digest.

Toyota Motor (TM) slashed its earnings outlook this week, citing the disruption to production caused by the worst floods in Thailand in almost 70 years. The timing couldn't be worse for the Japanese company, which is fighting the surging popularity of Hyundai Motor and its affiliate Kia Motors. In November, Toyota posted a 6.7% gain in deliveries, its first monthly sales increase since April. Meanwhile, Hyundai's sales gained 29%, surpassing analysts' estimates.

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The floods in Thailand disrupted production of several Toyota models, including the Camry and Corolla, exacerbating problems caused by the tsunami and earthquake in Japan earlier this year. The automaker's net income will slump to 180 billion yen in the 12 months ending March 31, lower than an earlier forecast of 390 billion yen and below the 393 billion yen estimate of financial analysts. Toyota also slashed its forecast for revenue and production.

There was bad news at DuPont (DD) and Texas Instruments (TXN) as well.

"We are seeing slower growth in certain segments during the fourth quarter, driven by global economic uncertainty," DuPont CEO Ellen Kullman said in a press release. Not surprisingly, the Wilmington, Del. company is seeing weakness in its consumer electronics and construction-related​ businesses.

Earnings for 2011 are projected to be $3.87 to $3.95 per share, down 10 cents from a forecast issued in October. Nonetheless, these results will represent an increase of as much as 20% over 2010.  More details will be provided at next week's investor day meetings.

The story is similar at Texas Instruments. The Dallas company cited "broadly lower demand across a wide range of markets, customers and products, except for wireless applications processors." Fourth-quarter revenue is expected to be $3.19 billion to $3.33 billion, versus an earlier projection of $3.26 billion to $3.54 billion. That's below analysts' forecasts of $3.41 billion. Earnings are projected at 21 cents to 25 cents, down from an earlier forecast of 28 cents to 36 cents.

Jonathan Berr is a freelance financial journalist.  He does not own shares of any of the companies listed here.