A westerly, very strong and variable flow prevails over the whole area.
For Agana Marina :
Warning moderate gale offshore.
We are 85% sure of the situation, because hail may not be as easy to predict.
In the evening, storms developing.
Violent showers . warning: hail! SSE wind force 4. Gusts reaching 29 knots in the evening. Slight sea. Low, short swell from SE. Excellent visibility.