GRAINS-Corn nears 1-yr high as adverse weather hits U.S. crops

* Forecasts call for hot weekend in U.S. Midwest, Plains

* MGEX spring wheat eases after near 2-yr high

* Soybeans follow corn higher

(New throughout; updates prices, adds quotes, changes byline, changes dateline from previous PARIS/SINGAPORE) CHICAGO, June 7 (Reuters) - U.S. spot corn futures hit a near one-year high on Wednesday on forecasts for potentially stressful crop weather in the Midwest, while Minneapolis spring wheat futures retreated from a near two-year high. Soybeans followed corn higher. The weather jitters come as commodity funds hold large net short positions in corn, wheat and soybeans, leaving the markets vulnerable to bouts of short-covering. As of 12:37 p.m. CDT (1730 GMT), Chicago Board of Trade July corn was up 7-3/4 cents at $3.85 per bushel after reaching $3.87, the highest spot price on a continuous chart since June 29, 2016. CBOT July soft red winter wheat was up 10-1/4 cents at $4.46 a bushel. But front-month MGEX spring wheat was down 1 cent at $5.97-3/4 after reaching $6.04-1/2, the highest since July 2015. CBOT July soybeans were up 7-3/4 cents at $9.31-1/4 a bushel. Even with the profit-taking setback in spring wheat, hot and dry weather in the northern U.S. Plains and northern Midwest remained the feature. Temperatures were expected to top 90 degrees Fahrenheit (32 Celsius) in both regions this weekend. "Both the Midwest and the northern Plains should see some relief next week. The issue is that ahead of that, we are going to get really, really warm," said Don Keeney, an agricultural meteorologist with MDA Weather Services. The U.S. corn crop is still a few weeks from its key pollination phase, which usually occurs in July. The U.S. Department of Agriculture on Monday rated 68 percent of the corn crop in good to excellent condition, up from 65 percent a week earlier, but the figure was down from 75 percent a year ago. "You have a crop that's not off to a good start and needs moisture, not hot and dry conditions," said Don Roose, president of U.S. Commodities. Traders anticipated farmer sales of old-crop corn as CBOT July corn pushed through $3.80, the top of a trading range that had persisted for several months. The CBOT December corn contract, representing the just-planted new crop, hit resistance at $4.04, likely due to farmers booking sales.

CBOT prices as of 12:36 p.m. CDT (1736 GMT):

Net Pct Volume

Last change change

CBOT wheat WN7 446.25 10.50 2.4 92800 CBOT corn CN7 385.25 8.00 2.1 435862 CBOT soybeans SN7 931.50 8.00 0.9 96387 CBOT soymeal SMN7 305.30 4.20 1.4 42618 CBOT soyoil BON7 31.36 -0.03 -0.1 48587

NOTE: CBOT wheat, corn and soybeans shown in cents per bushel, soymeal in dollars per short ton and soyoil in cents per lb.

(Additional reporting by Sybille de La Hamaide in Paris and Naveen Thukral in Singapore; Editing by Meredith Mazzilli)