Breezy, Variably Cloudy & Isolated Showers Forecast Through Christmas 2020

Areas of low-level convergence will bring a few showers across T&T mainly over the next 24 hours, through Friday afternoon. These showers will be interrupting variably cloudy skies and breezy conditions, with a mostly sunny weekend forecast.

With strong low-level winds, seas are also agitated with long period swells affecting our northern and eastern coastlines through Saturday evening.

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

The Forecast

For this evening through Christmas Day, initially settled and clear skies will give way to partly cloudy to mostly cloudy skies. Brisk, isolated showers are forecast to begin after nightfall, moving across both islands and continue through early Christmas Day. Heavier activity to favor eastern Trinidad and Tobago. Breezy conditions are expected through Christmas 2020 and by the afternoon, partly cloudy to sunny and clear skies.

On Saturday and Sunday, mostly sunny to partly cloudy skies across Trinidad and Tobago, with brisk, isolated showers possible. Breezy conditions will continue on Saturday and winds will be on the decline on Sunday.


Marine: Seas are forecast to be moderate to rough Thursday night through Friday, returning to moderate on Friday night through Sunday.

Generally, in open waters, waves are forecast to be between 2.0 to 2.5 meters, occasionally up to 3.0 meters in open waters on Thursday night through Friday. In sheltered areas, seas will be near 1.0 meters and choppy, with nearshore areas of northern and eastern coastlines experiencing waves up to 2.0 meters due to long period swells through Friday night.

From Friday night through Sunday, waves will be generally less than 2.0 meters in open waters and in sheltered areas, near 1.0 meter but choppy.


Overview: A surface to low-level ridge is dominant across Trinidad and Tobago, with moderate winds from the east-northeast to northeast resulting in mostly fair conditions.

However, pockets of low-level convergence with ample moisture are approaching Trinidad and Tobago between Thursday evening and Friday which more isolated pockets through the weekend forecast. This will support isolated showers and some cloudiness through Sunday but clouds and showers will be moving briskly westward.

Strong to very strong wind shear from the west to southwest will also limit the intensity and duration of showers, with unfavorable conditions for thunderstorms.

Temperatures

Across both islands, cool conditions are forecast on Friday through the weekend. The maximum high for Trinidad is forecast to be near 31.0°C, up to 33.0°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

With strong winds at low-levels of the atmosphere, gusty winds up to and in excess of 50 KM/H are possible, which may down trees and cause minor wind damage.

Winds

Sustained surface winds gentle to moderate (10-35 KM/H). In heavy shower or thunderstorm activity, gusts up to and in excess of 50 KM/H are possible.

With wind gusts in excess of 50 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, little to no rainfall accumulation is forecast, between 0 to 5 millimeters in most areas daily through the weekend and isolated totals up to 15 millimeters possible.

Generally, with heavy showers, street flooding, particularly in flood-prone areas or areas with poor drainage, is possible as well as flash flooding in areas where more prolonged heavy rainfall may occur.

Lightning: Thunderstorm activity is unlikely. However, lightning is expected if a thunderstorm occurs. Lightning can cause power outages, voltage dips, damage to life and property, particularly during cloud-to-ground lightning strikes.

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.

Isolated rainfall is forecast on Thursday night through the weekend.

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