By Ben Eisen, MarketWatch

NEW YORK (MarketWatch) -- Treasury prices swung slightly higher Wednesday afternoon following the Federal Reserve's Beige Book, which suggested the economy continued to expand, but that cold weather interfered with economic improvement.

The central bank's report, which provides anecdotal evidence about how fast the economy is growing across its 12 districts, showed that eight of the districts were expanding at a "modest to moderate" pace, with three districts reporting slower growth due to the cold weather. Some districts also reported that cold weather was increasing demand for energy production.

The Beige Book, often ignored by the markets because of its anecdotal nature, provided a rare dose of clarity, according to Eric Green, global head of rates, FX & commodity research at TD Securities.

"What the Beige does do is reinforce our bias and that at the Fed that the slowdown in economic activity is short lived," he said in a note.

After the report, the 10-year note (10_YEAR) yield, which falls as prices rise, was down slightly on the day at 2.689%. The benchmark yield bounced around near unchanged for most of the day, but it rose sharply in the previous session as investors unwound movements into safe investments like Treasurys alongside cooling geopolitical tensions in Ukraine.

The 30-year bond (30_YEAR) yield was down half a basis point at 3.634%, while the 5-year note (5_YEAR) yield was unchanged at 1.529%.

Treasurys fell Wednesday morning, but recovered after weak data. Companies that employ about four-fifths of American workers grew more slowly in February, data from the Institute for Supply Management showed. The index dropped to 51.6% last month from 54% in the prior month, missing economist expectations of a 53% reading. Those companies said their workforces contracted for the first time in more than two years.

Treasurys "rebounded off of weaker than expected data this morning, and some short-covering as well after sizeable declines to start the week," said Kim Rupert, managing director of global fixed-income analysis for Action Economics LLC. She added that the market is in "wait and see" mode ahead of a Friday jobs report that will provide another temperature reading on the economy.

Investors remain concerned about how much of the recent weak data is attributable to weather, and how much is part of an underlying slowdown in economic growth, with some concerned that a sluggish economy could prompt the Federal Reserve to slow down the pace of its gradual policy normalization. Nonetheless, most expect the central bank to continue winding down its bond-buying stimulus program at the current pace.

Treasurys paid little attention to a report that showed private-sector employment rose by 139,000 jobs in February. That was a slightly faster pace than a downwardly revised 127,000 jobs number in January, said Automatic Data Processing Inc. on Wednesday. Economists had expected 160,000 new jobs.

Despite the soft ADP report, investors are likely to "grit their teeth" and continue to chalk up the recent string of weak numbers to cold weather, according to Andrew Wilkinson, chief market analyst at Interactive Brokers LLC.

"The latest data fails to really show signs of slowdown while shoring up optimism that the payback resulting from the cold winter will produce a positive hiring rebound come the spring," he said in a note.

A number of corporate issuers, including Ford Motors Co. (F) and AT&T Inc. (T) were in the market selling high-grade corporate bonds Wednesday, which may have sapped some demand from the Treasury market.

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