* Ringgit weakens, falls to fresh 3-month low on Monday * Prices up on weak ringgit, flood worries - trader * Workers strike at Jakarta's biggest port, but operations normal By Anuradha Raghu KUALA LUMPUR, Dec 23 (Reuters) - Malaysian palm oil futures inched up on Monday, stretching gains into a third straight day as the ringgit's poor performance stoked demand from overseas buyers, while concerns over supply disruption due to monsoon floods also buoyed prices. The Malaysian ringgit touched a fresh three-month low on Monday, falling 0.29 percent to trade at 3.2935 versus the U.S dollar. The weaker ringgit makes Malaysian palm cheaper for overseas buyers and refiners, prompting them to book shipments. Concerns that monsoon floods in key palm-growing states in Malaysia would hamper production also lifted prices of the tropical oil. Malaysia's Meteorological Department warned that thunderstorms and heavy rains are expected over the states of Johor and Sarawak until Monday afternoon, and potentially cause flash floods in low-lying areas. "We are affected by the weak ringgit, and the floods which is a prevailing worry," said a trader with a foreign commodities brokerage in Malaysia. By the midday break, the benchmark March contract on the Bursa Malaysia Derivatives Exchange had inched up 1.1 percent to 2,613 ringgit ($794) per tonne. Total traded volume stood at 15,253 lots of 25 tonnes, above the average 12,500 lots. More than a hundred workers at Indonesia's biggest port Tanjung Priok went on strike late Sunday, but port officials said shipping and port operations were unaffected as of Monday. "I heard things are working normally in Tanjung Priok, with only a small disruption," said an official at a major palm firm who cannot be named as he was not authorised to speak to the media. Tanjung Priok port handles about 50 percent of oil, containers, and dry bulk goods in and out of Indonesia. Global commodity markets were not impacted by the strike for now, traders said. In other markets, Brent crude rose to a two-week high above $111 a barrel on Monday as internal strife in South Sudan threatened the country's oil output, adding to supply woes in Africa. In other competing vegetable oil markets, the U.S. soyoil contract for January fell 0.1 percent in early Asian trade, while the most active May soybean oil contract on the Dalian Commodities Exchange slipped 0.1 percent. Palm, soy and crude oil prices at 0542 GMT Contract Month Last Change Low High Volume MY PALM OIL JAN4 2575 +29.00 2534 2575 178 MY PALM OIL FEB4 2594 +23.00 2563 2598 1502 MY PALM OIL MAR4 2613 +29.00 2573 2617 8563 CHINA PALM OLEIN MAY4 6030 -30.00 5974 6080 598688 CHINA SOYOIL MAY4 6968 -10.00 6926 7006 470268 CBOT SOY OIL MAR4 39.73 -0.01 39.55 39.89 1988 NYMEX CRUDE FEB4 99.25 -0.07 99.15 99.31 2976 Palm oil prices in Malaysian ringgit per tonne CBOT soy oil in U.S. cents per pound Dalian soy oil and RBD palm olein in Chinese yuan per tonne Crude in U.S. dollars per barrel

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