FPKU40 NFFN 120000 RNZI NORTHERN AND SOUTHERN COOKS WEATHER BULLETIN ISSUED FROM NWFC NADI DEC 120238 UTC. SITUATION: AN EASTERLY WIND FLOW PREVAILS OVER SOUTHERN COOKS. MEANWHILE, A TROUGH OF LOW PRESSURE IS EXPECTED TO AFFECT THE NORTHERN PART FROM LATER TONIGHT AND GRADUALLY MOVING SOUTHWARDS OVER THE REST OF THE GROUP. AN EASTERLY WIND FLOW PREVAILS OVER NORTHERN COOKS. FORECAST TO MIDNIGHT TOMORROW FOR THE SOUTHERN COOKS: CLOUDY PERIODS WITH BRIEF SHOWERS. SHOWERS GRADUALLY DEVELOPING AND BECOMING FREQUENT WITH ISOLATED THUNDERSTORMS OVER THE NORTHERN PART AND GRADUALLY SPREADING TO THE REST OF THE GROUP FROM LATER TONIGHT. MODERATE TO FRESH EASTERLY WINDS, GUSTY AT TIMES. MODERATE TO ROUGH SEAS. FURTHER OUTLOOK: OCCASIONAL SHOWERS, HEAVY AT TIMES AND ISOLATED THUNDERSTORMS OVER THE NORTHERN PART. ELSEWHERE, CLOUDY PERIODS WITH BRIEF SHOWERS. SHOWERS EXPECTED TO GRADUALLY DEVELOPING AND BECOMING FREQUENT OVER THE REST OF THE GROUP. FOR RAROTONGA: CLOUDY PERIODS WITH BRIEF SHOWERS. SHOWERS GRADUALLY DEVELOPING AND BECOMING FREQUENT WITH ISOLATED THUNDERSTORMS FROM LATER TONIGHT. FURTHER OUTLOOK: CLOUDY PERIODS WITH BRIEF SHOWERS. SHOWERS GRADUALLY DEVELOPING AND BECOMING FREQUENT. FOR THE NORTHERN COOKS: CLOUDY PERIODS WITH SOME SHOWERS AND ISOLATED THUNDERSTORMS. MODERATE TO FRESH EASTERLY WINDS. MODERATE TO ROUGH SEAS. FURTHER OUTLOOK: CLOUDY PERIODS WITH SOME SHOWERS AND ISOLATED THUNDERSTORMS.