Understanding this TAF
Can someone please help me with this TAF, Where it says BECMG 2401/2402 and in that sentence after overcast 2000feet it says "620203" what does that mean?
NZPG TAF 2315/2415 (2404/2504NZDT) 03005KT 9999 SCT030 SCT100 BKN150 QNH2888INS GRID20005KT
BECMG 2319/2321 (2408/2410) 15008KT 9999 SCT025 BKN080 BKN150 QNH2883INS GRID32008KT
BECMG 2323/2324 (2412/2413) 16016KT 9999 BKN025 BKN040 BKN080 BKN150 QNH2880INS GRID33016KT
BECMG 2401/2402 (2414/2415) 17019KT 0800 SN BLSN OVC020 620203 QNH2882INS GRID34019KT
BECMG 2404/2406 (2417/2419) 16020KT 9999 VCSN OVC015 620152 QNH2883INS GRID33020KT
TEMPO 2409/2411 (2422/2424) 1600 -SN OVC010