Moderate haze is expected this afternoon, alternating with a few scattered showers.By nightfall, instability should be increasing as another tropical wave quickly approaches the region. Across St.Vincent and the Grenadines (SVG), scattered showers are expected to increase tonight with isolated thunderstorm activity. The deepening of a mid to upper-level trough should occasionally enhance showers and thunderstorm activity during Sunday which could result in isolated ponding and flash-flooding in vulnerable areas.