GRAINS-Wheat hits 6-mth high as dry weather threatens U.S. crop

* Wheat extends two-day gains to nearly 4 pct

* Dry weather threatens U.S. production -analysts

* Corn edges lower, soybean prices firm

SYDNEY, Feb 13 (Reuters) - U.S. wheat futures rose on Tuesday to hit a six-month high as dry weather across a major producing region stoked concerns about potential shortfalls in output. Corn edged lower, retreating after posting gains of more than 1 percent in the previous session, while soybean prices extended their two-day advance to 2 percent. The most active wheat futures on the Chicago Board of Trade were up 0.6 percent at $4.66-3/4 a bushel at 0350 GMT, after earlier touching their highest since Aug. 8 at $4.67-1/4 a bushel. Wheat closed up 3.3 percent on Monday. Wheat has come under sustained pressure in recent months amid ample global supplies, but with forecasts for continued dry weather, traders are growing increasingly worried about production shortfalls. "Many, ourselves included, would be most uncomfortable about being short now. Investors, many of whom will be like-minded, have enough buying power to push prices higher," said Tobin Gorey, director of agricultural strategy, Commonwealth Bank of Australia. The run-up in prices appeared likely to curb export demand for U.S. wheat, a factor underscored when the U.S. Department of Agriculture on Thursday lowered its U.S. wheat export forecast for the 2017/18 marketing year. The most active corn futures were down 0.1 percent at $3.66-3/4 a bushel. They gained 1.4 percent in the previous session. The most active soybean futures were up 0.1 percent at $10.02-1/4 a bushel, having firmed 1.9 percent on Monday. Gains in soybeans were checked by concerns about Chinese demand. Meanwhile, some Chinese buyers have canceled corn purchases from the United States and switched to rival supplier Ukraine, as Beijing tightens controls on processing genetically modified strains of the crop, trade sources said.

Grains prices at 0350 GMT

Contract Last Change Pct chg Two-day chg MA 30 RSI CBOT wheat 466.75 2.75 +0.59% +3.95% 438.77 67 CBOT corn 366.75 -0.25 -0.07% +1.31% 355.98 63 CBOT soy 1002.25 0.50 +0.05% +1.96% 978.68 65 CBOT rice 12.38 -$0.01 -0.08% +0.45% $12.17 55 WTI crude 59.64 $0.35 +0.59% +0.74% $63.22 24


Euro/dlr $1.229 $0.000 +0.00% +0.47% USD/AUD 0.7866 0.001 +0.10% +0.69%

Most active contracts Wheat, corn and soy US cents/bushel. Rice: USD per hundredweight RSI 14, exponential

(Reporting by Colin Packham Editing by Joseph Radford)