FORECAST DISCUSSION
WEDNESDAY 10th August 2022 – AM SHIFT
TONIGHT:
Latest satellite imageries showed thick low-mid level clouds streaming towards the islands along an East to Northeast wind flow this evening. Sounding profile depicted a conditionally unstable atmosphere with moisture available near the surface. Moderate winds continues to persist near the surface and is also evident on the wind profiler data. The steering level is also ranging at 10-15 knots and would slow down the movement of clouds as they move across the islands. The strong wind shear continues to persist and aid in the restricting of the vertical cloud development of convections in the nowcast period. Therefore, expect cloudy periods with isolated showers.
THURSDAY THROUGH WEDNESDAY:
The warm cross-equatorial Northeasterly will persist in the start of the outlook period with a speed convergence along the mean wind flow allowing an increase of moisture content for the start of the outlook period. The high-pressure system to the southeast would start to build eastward as it directs a trough of low pressure from the southwest with increased showery activities for Friday and Saturday. By Sunday a convergence zone riding along the high-pressure system will again introduce the tradewind regime and some showery activities with fresh to strong winds to pick up in the latter part of the outlook period.
MARINE OUTLOOK:
The weakening high-pressure system stationed further Southeast have shown a gradual decrease of high combined waves and swells over Samoa’s marine waters. The latest marine observations show waves diminishing below 3 metres as it remains above the 2.5 metres advisory threshold. Therefore, the Marine Advisory remains in force for all marine waters of Samoa.
WARNING/ADVISORY:
VALID: MARINE ADVISORY.
TEAM AM-SHIFT:
A. Maua, E. Toluono & MJS.