For Hirokawa Maru - Bonegi 1 :
No gale warning.
The reliability of the situation is good.
Overcast skies with storms likely in the morning, storms developing in the afternoon. Showers in late morning, heavy showers in the afternoon. In the evening, stormy but gradually improving.
Heavy showers. NE force 2 in the morning becoming ENE force 1 in the evening. Gusts reaching 11 knots until the middle of the day. Slight sea. Low, short swell from S. Visibility reduced by fog becoming reduced by mist in the middle of the day then reduced by fog.