72 Hours Outlook

The east-southeasterly wind-flow around the south- westerrn edge of the Atlantic High Pressure System continues to create weak low level instability with occasional moisture and scattered showers across our islands. As upper levels remain relatively dry, a subsident pattern continues to inhibit deep convective shower activity.

The frontal boundary continues eastward across the Atlantic waters as it weakens the High Pressure System; to be oriented east-west just north of the island chain tonight and Friday. Although the lower levels are expected to dry out Friday, upper level subsident pattern could change due to a possible short wave trough just west of the island chain by Friday night. A weak surface to low level trough system is expected across the region Saturday (though dry), some low-mid level moisture convergence behind the trough axis late Saturday into Sunday and weak upper level divergence could result in scattered showers.

Moderate (20-28km/h) breeze from east southeast could become occasionally gentle (12-19km/h) and increasing to fresh (29-38km/h) overnight Sunday. Slight (0.6m- 1.2m) seas on the west coasts and slight to moderate (1.0m - 1.5m) seas on the east coasts should continue into the weekend. However, some northerly swells Saturday night should return to east-north easterly by Sunday evening. Fairly good visibility at present could be decreased due to dust concentrations across the area gradually thickening Sunday.

Special feature: A 1000 mb low is centered 33N51W with associated cold front extending SW from the low to 27N63W. Near gale to gale force S-SW winds are expected for the next 12 hours.