Lingering moisture associated with the passage of a low level shearline will continue to produce cloudiness and light to moderate showers across St. Vincent and the Grenadines during the next 6-12 hours. Thereafter, the Atlantic High Pressure System will re-establish itself across the islands.
A weak anti-cyclonic circulation ‘High Pressure’ is across the Western Atlantic just north of the island chain. The patch of dry Saharan dust caught in its circulation, is causing occasional slight haze and limited shower activity. Some thinning could allow for a few scattered showers across St. Vincent and the Grenadines (SVG) on Sunday. Limited moisture ahead of a weak trough, on the southern edge of the High Pressure System should cross our area late Sunday into Monday morning. Trailing the trough axis, lower-level moisture could converge across our area with increased cloudiness and some showers late Monday
Overnight, hazy conditions could give way to scattered showers as instability lingers across our area.
The instability and cloudiness at the mid-to upper levels across St. Vincent and the Grenadines (SVG) should be decreasing late Friday. At lower levels, the Atlantic High Pressure System should be rebuilding across SVG by weekend. A patch of Saharan dust is reducing visibility across our area and slight haze may thicken during Friday before thinning out by Sunday.
The combination of lower-level trough, shearline feature and favourable mid to upper level support should maintain instability with some cloudiness across St.Vincent and the Grenadines (SVG) until late Friday. As lower-level moisture converges within an anti-cyclonic (High Pressure) circulation east of the island chain, deep convective clouds (towering) could bring occasional light rain, scattered showers and possibly isolated thunderstorms across our islands. Cloudiness and instability should be reduced by Saturday, as the Atlantic High Pressure System rebuilds across our area.
Gentle to moderate (10 - 30km/h) breeze should continue across our islands,
A deep ‘cut-off low’ in the Central Atlantic could create favourable mid to upper level (tropical upper tropospheric trough-TUTT) support for shower activity with troughs occasionally propagating the island chain. One such trough should be approaching our islands on Tuesday, with increasing moisture/cloudiness across the Grenadine Islands to shift northwards with scattered showers across St.Vincent and the Grenadines (SVG) by evening. Deep convective clouds (towering) and isolated thunderstorms are possible across SVG during Tuesday night.
The Western Atlantic ‘Bermuda’ High Pressure is dominant across the Leeward and Northern Windward Islands, but a deep ‘cut-off low’ in the Central Atlantic is creating instability across the southernmost section of the island chain. Cloudiness is gradually decreasing and a few showers can be expected this afternoon across St. Vincent and the Grenadines (SVG).
The Western Atlantic High Pressure is gaining dominance across the Leeward and Northern Windward Islands, but a deep ‘cut-off low’ pressure area is deepening in the Central Atlantic creating instability across the southernmost section of the island chain. This ‘cut-off low’ feature, could create favourable mid to upper level (tropical upper tropospheric trough-TUTT) support for shower activity across the southernmost islands as weak troughs propagate across the island chain. Occasional cloudiness and showers across St. Vincent and the Grenadines (SVG) could spike with shower activity late Saturday
A weak shearline feature is across the Windward Islands and marginal increase in moisture at mid-levels could result in scattered showers across our area this afternoon into tonight. A few scattered showers can be expected on Friday due to shallow cloud patches within the trade wind-flow.
Moderate (20 - 35km/h) east north-easterly trades are across our islands and should gradually increase to fresh (up to 40km/h) breeze by tonight with occasional strong gusts.
Weak instability approaching our islands could result in partly cloudy skies becoming cloudy at times with some scattered showers this evening into Tuesday. By mid- week, the Atlantic High Pressure System could be struggling to rebuild north of the island chain and a few scattered showers should be confined to the Southern Grenadines area due to a shearline feature.
The High Pressure System is building across the Atlantic; but lower-level moisture associated with shearline features on its southern edge, are across some Windward Islands including St.Vincent and the Grenadines (SVG). Mid to upper level features are aligned, occasionally creating enhancement to shower activity. Over the next couple days, partly cloudy skies could become cloudy at times with scattered showers. Moderate to occasionally fresh (20 - 40km/h) east north-easterly trades