THE Bureau of Meteorology has warned moderate flooding could occur in Murwillumbah late this evening. Intense rainfall from thunderstorms have been recorded in the past six hours in the upstream tributaries from Murwillumbah, the bureau said in its latest alert. As a result rapid river level rises have been observed along the Tweed River at Uki and fast flows from Uki are travelling to Murwillumbah. Murwillumbah is expected to exceed the minor flood level early Wednesday evening and possibly reach the moderate flood level at North Murwillumbah overnight Wednesday night. Further rises are possible as further heavy rainfall is forecast.