FATO40 NFFN 191500 TONGA AREA FORECAST VALID FROM AUGUST 191700 TO 200800 UTC 2025. SITUATION: A SOUTHEAST WIND FLOW PREVAILS OVER THE AREA. MEANWHILE, A WEAK TROUGH OF LOW PRESSURE LIES SLOW MOVING TO THE NORTH OF TONGA. WINDS: [SPEED IN KNOTS] FL240 27035M19 FL180 28030M07 FL140 25030P01 FL100 26025 FL070 22020 FL050 20015 FL020 18010 SIGWX: ISOL SHRA. VIS: 40KM, 10KM-15KM IN -SHRA, 5000M-10KM IN SHRA. CLOUD: FEW-SCT CU 015-030, TOPS 100-180, BKN IN SIGWX. FEW-SCT SC 030-050. TAF NFTV 191111Z 1912/2012 12007KT 9999 FEW008 SCT015= TAF NFTL 182301Z 1900/1912 14010KT 9999 SCT016= TAF NFTF 191112Z 1912/2012 16007KT 9999 FEW015=