* Weekly US export sales disappoint traders

* Kansas wheat tour projects yields up from last year.

* Russia says frosts kill 1% of wheat crop


(Recasts to reflect U.S. trading, adds analyst comments, market details, changes dateline from PARIS/CANBERRA)

CHICAGO, May 16 (Reuters) - Chicago Board of Trade soybean futures rose on Thursday as renewed worries about major flooding in southern Brazil offset data indicating lower demand for soy from U.S. processors, analysts said.

Corn dipped on expectations that drier weather will favor plantings in the U.S. Midwest, while disappointing U.S. export numbers hung over corn and wheat.

Soybean futures got a boost from concerns about production losses in Brazil's Rio Grande do Sul, following massive flooding in the state, said Jim McCormick, cofounder of AgMarket.net.

The issue "seemed to move to the back burner," said McCormick, but "it seems to be coming to the forefront again."

On Wednesday, the National Oilseed Processors Association said U.S. soybean crushings dropped to 166.0 million bushels in April, a seven-month low that fell below all trade estimates, indicating lower demand for soybeans.

The most-active soybean contract on the Chicago Board of Trade was up 2-3/4 cents at $12.16-1/4 a bushel at 12:15 p.m. CDT (1715 GMT).

CBOT wheat dropped 6 cents to $6.59-3/4 a bushel, while corn lost 6 cents to $4.56-1/2 a bushel.

Wheat bumped up against technical resistance after reaching 10-month highs this week due to poor crop weather in top-exporter Russia, McCormick said.

Russia's agriculture ministry said frosts killed 830,000 hectares of crops, or about 1% of the country's total, a local news agency reported.

In the U.S., the second day of the Wheat Quality Council's annual Kansas wheat tour on Wednesday projected yields in southwestern Kansas at 42.4 bushels an acre, up from a drought-reduced 27.6 in 2023. The tour concludes on Thursday.

The U.S. Department of Agriculture reported export sales of new-crop U.S. wheat last week at 304,300 metric tons and old-crop U.S. corn at 742,200 metric tons, both near the low end of trade expectations.

Weekly export sales of old-crop U.S. soybeans were 265,700 metric tons, below trade expectations.

(Reporting by Renee Hickman in Chicago Additional reported by Peter Hobson in Canberra and Sybille de La Hamaide in Paris Editing by Matthew Lewis)