Windy, Hazy Conditions Forecast For T&T

GOES-East Imagery showing few low-level cloud patches embedded within the strong trade wind flow of the dominating high-pressure system.

Increasingly windy and hazy conditions are forecast across T&T over the next 48 hours as the pressure gradient associated with a high-pressure system strengthens across the region.

Accompanying this surge in winds will be increased Saharan Dust concentrations and rough seas in our eastern coastal waters.

Rainfall will be brisk, associated with fast-moving low-level cloud patches (areas of convergence) moving within the trade-wind-flow of the high-pressure system.

There are no alerts, watches or warnings from the Trinidad and Tobago Meteorological Service for Trinidad and Tobago at this time.

The Forecast

For both Sunday and Monday, mostly sunny to partly cloudy skies, with increasingly hazy and breezy conditions are forecast for T&T. Brisk isolated showers, with brief cloudy periods are possible with gusty winds accompanying and ahead of showery activity.

Marine: Through the next 48 hours, seas are forecast to increase, with waves in open waters of Trinidad moderate, up to 2.5 meters and across Tobago, rough up to 3.0 meters. Along northern, eastern, and sheltered coastlines, waves near 1.0 meter are likely, with higher waves possible due to long-period northerly swells.


Overview: Dominating the overall wind flow, a deep layered high-pressure system will remain in place into the week, with wind speeds gradually strengthening. In addition, a relatively dry and subsident pattern is forecast over the region.

Embedded convergence and confluence will bring shallow (capped to low- to mid-levels of the atmosphere) showers to T&T, remaining fairly brisk.

No significant change is forecast for T&T and the Southern Windward islands through Tuesday.

Temperatures

Across both islands, overnight lows are forecast to be mild to cool with daytime highs warm.

The minimum low for Trinidad is forecast to be near 22.0°C, and as low as 19.0°C in valleys and forested areas of Central and Southern Trinidad. In Tobago, a minimum low near 23.0°C is forecast.

The maximum high for Trinidad is forecast to be near 31.0°C, up to 34.0°C in urban and built-up areas, particularly between 9:00 AM and 3:00 PM. In Tobago, the maximum high is forecast to be near 31.0°C.

Temperatures in cities, such as Port of Spain, tend to be much higher than surrounding locations due to a phenomenon called the Urban Heat Island Effect. There are several causes, but the main instigator for this phenomenon tends to be increased dark surfaces such as roads and pavement in cities, which absorb solar radiation more than surrounding areas.

Forecast Impacts

The main hazards over the next 48 hours would be gusty winds, particularly in showers on land and for mariners, hazardous seas. Rainfall is forecast to remain fairly brisk so the risk of street flooding is low.

Winds

Sustained surface winds moderate to fresh (20-38 KM/H). In shower activity, gusts up to and in excess of 55 KM/H are possible.

With wind gusts in excess of 55 KM/H, whole trees are expected to be in motion, and there may be some inconvenience when walking against the wind gusts. Light outdoor objects may topple or become airborne such as garbage cans, potted plants, loose galvanize or construction material, and other outdoor furniture. Tents may jump. Older/weaker trees may fall, bringing down utility poles and lines.

Rainfall

Across most areas of Trinidad and Tobago, less than 5 millimeters of rainfall is anticipated over the next 24-48 hours, with maximum accumulation totals up to 10 millimeters favoring eastern areas.

Why I May Not/Will Not See Rainfall?

A frequent complaint is the forecast is wrong because I didn’t experience any rainfall. Scattered showers mean that you, individually, may experience some showers intermittently throughout the day and there is a higher chance for this activity than isolated activity. Widespread showers mean that nearly all persons and areas may experience rainfall.

Highly Isolated rainfall is forecast on Sunday through Monday.

Forecast - Isolated, Scattered, Widespread - What do they mean?

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