SINGAPORE | Mon May 11, 2015 10:43pm BST

Closely watched weather forecasts by Japan and Australia on Tuesday are likely to confirm the return of El Nino this year. In 2009, the weather pattern had caused the worst drought in four decades in India and ravaged croplands across Asia, driving food prices to multi-year highs.

See below for a list of crops most at risk from an El Nino.

WHEAT

Australia's high-protein wheat crop is likely to take a hit with El Nino expected to bring dry weather across its eastern grain-belt. Wheat is planted in April-May and the period that makes or breaks the crop is in September. Some rains in recent weeks in parts of the east coast have encouraged farmers to plant the crop.

RICE

Although there are abundant stocks of rice in key producers India and Thailand, El Nino is likely to curb the output of Asia's staple food. This would provide a floor under rice prices that are trading around 12 percent below last year's peak. A rally in rice has the potential of stoking inflationary fears and unrest in the region. Rice is planted in May-July and requires rains between July and August.

SOYBEANS

Soybean production would take a hit in India, Asia's second largest producer of the oilseed, if El Nino brings dry weather to the western and central regions of the country. This could prompt India to import more palm oil and spur further potential gains in prices of the tropical oil. Soybeans are planted in June-July and the crop needs rains in August-September.

PALM OIL

El Nino does not immediately hit palm oil supplies as it takes about nine months to a year for oil palm trees to show stress due to drought. But rising demand from top importers India and China as well as concerns over an eventual tightening in supplies due to any crop stress will boost prices. About 90 percent of palm oil, which accounts for 35 percent of global edible oil supply, is produced in Indonesia and Malaysia.

CORN

Corn production in China and India is also at risk. Typically, China escapes the brunt of El Nino but corn yields may be curbed as the crop needs relatively higher volumes of water. India could see its crop exports drop, helping U.S. and South American suppliers sell more.