* Wheat prices tick up on weather woes in Black Sea

* Soy falls on strong global competition, US plantings

* Corn falls on technical trading

CHICAGO, May 21 (Reuters) - Chicago Board of Trade wheat futures reached their highest level since July on Tuesday as lower U.S. crop ratings and frost damage in top-exporter Russia supported prices, traders said.

The market temporarily extended gains above $7 per bushel following a 6% rise on Monday.

IKAR agricultural consultancy cut its Russian wheat crop forecast to 83.5 million metric tons from 86 million tons and lowered its projection for 2024/25 Russian wheat exports to 45 million tons from 47 million tons.

"Yesterday (Monday) was a significant move to the upside on wheat," said Mark Schultz, trader at Northstar Commodity. "There's still uncertainty over the size of the crop."

The U.S. Department of Agriculture (USDA) lowered its U.S. winter wheat crop condition rating to 49% good to excellent in a weekly crop progress report on Monday, down 1 point from a week ago and 2 points below the average estimate gathered by Reuters from 14 analysts.

In Ukraine, a major wheat and corn exporter, a state weather forecaster said recent frosts in the east, north and center of Ukraine had not caused significant damage to grain and oilseed crops.

Soybeans and corn futures fell under pressure from a rapidly advancing U.S. plantings.

The USDA said 70% of the U.S. corn crop and 52% of the soybean crop was planted as of Sunday.

"The planting progress for all crops was further along than what the trade was expecting," Schultz said.

The most-active wheat contract on the Chicago Board of Trade (CBOT) was up 1-3/4 cents at $6.90-1/2 a bushel, as of 1530 GMT. Soybeans lost 15 cents to 12.32-3/4 a bushel and corn lost 4 cents to $4.56-3/4 a bushel.

Corn prices ticked down on technical trading but gained support from steady wheat prices.

Soybeans fell on low meal prices, traders said. The competitiveness of U.S. soymeal on the global market remains in doubt as Argentina is expected to start crushing increasing amounts of soybeans.

(Reporting by Heather Schlitz. Additional reporting by Naveen Thukral; Editing by Rashmi Aich, Sherry Jacob-Phillips, Will Dunham and Susan Fenton)