A tropical wave is crossing our area bringing scattered showers across St. Vincent and the Grenadines (SVG) to continue during Friday with occasional upper level support enhancing shower activity/thunderstorms. A lower level trough (seen as tropical wave on analysis at 18z) should be approaching the region Saturday into Sunday adding to instability with moderate to heavy showers and thunderstorm activity. Moderate to heavy shower activity is expected as upper level conditions could support a south easterly wind flow with moisture converging across the islands. Residents and motorists should continue to exercise caution near rivers, streams and low lying areas during shower episodes.
Moderate (20 – 30km/h) breeze is expected tonight with wind direction backing to east north-easterly with the crossing of the tropical wave, to veer again on Friday and become gentle by afternoon. Wind speeds should become occasionally fresh (30-40km/h) during Saturday, then as the trough approaches the direction should back to north easterly late Saturday. Some veering to south easterly is expected during Sunday while decreasing to gentle and further to light/calm by Sunday evening.
Mean Sea level Pressure readings should be fluctuating between 1009mb and 1012mb across our area.
Slight seas on the west coasts should peak near 1.2m; while on the east coasts slight to moderate seas should peak near 1.8m with east north-easterly swells. In response to wind speeds, a temporary slight increase in wave heights may be experienced across SVG during Saturday
Notes:
Tropical wave from 11N22W to 02N24W, moving W at 10 kt. This wave is noticeable in model diagnostics at 700 mb and SSMI TPW imagery. Abundant moisture is also in its environment. Scattered showers are within 90 nm of the wave…. about 2220 nmiles away
Tropical wave from 14N45W to 04N47W, moving W at 10 kt. SSMI TPW imagery shows a moisture area associated with this wave. A 700 mb trough is also noted. Isolated moderate convection is from 10N-13N between 43W-49W. Scattered showers are within 90 nm of the remainder of the wave…. about 840 nmiles away…. Vicinity Saturday into Sunday