Isolated Showers Forecast Overnight. Scattered Showers, Possible Thunderstorms on Tuesday. Street Flooding Possible.

What happened today?

As forecast, light winds persisted across Trinidad and Tobago today. Light winds from the south to southeast allowed for favorable low-level convergence to develop across Trinidad when coupled with daytime heating. High amounts of atmospheric moisture fuelled convection and with relatively weak wind shear, heavy showers and thunderstorms flourished.

In addition, these light (weak) winds at low levels resulted in the slow movement of these showers and thunderstorms. This allowed for high rainfall accumulations across interior Central Trinidad and along the south-facing slopes of the Northern Range, along the East-West Corridor.

Lastly, since winds were moving across Trinidad (and Tobago) from the south, the Northern Range forced air upwards, called orographic lift. This phenomenon, simply put, aid in the development of showers, or enhance showers and thunderstorms. The latter was the case today across the Northern Range.

With all these features coming together, showers and thunderstorms persisted across mainly Trinidad throughout the day, dumping copious amounts of rainfall across the East-West Corridor, resulting in street and flash flooding across many major roadways in the North-Central area. Similar conditions are forecast on Tuesday.

Strong winds also toppled a large tree along Boordam Drive, El Dorado, Tunapuna – damaging a car and roof of a garden shed, toppling a wall and bringing down electrical wires.

Strong winds also toppled a large tree along Boordam Drive, El Dorado, Tunapuna – damaging a car and roof of a garden shed, toppling a wall and bringing down electrical wires. Video: Varma Scott Miike (Facebook)

Weather Forecast (Next 24 Hours)

As of 7:00 PM Monday 29th July 2019, mostly cloudy skies are occurring across Trinidad and Tobago, with an isolated cluster of showers occurring across NE Trinidad. A cluster of showers have developed east and southeast of Trinidad, gradually moving west. This cluster of showers is forecast to move across Southeastern Trinidad overnight, gradually diminishing. On Tuesday, an initially clear start to the day is forecast to give way to isolated showers by the late morning. Increasing showers and isolated thunderstorms are likely after midday, with Tropical Wave 30 affecting the islands into nightfall.

The influence of Tropical Wave 29 is waning across Trinidad and Tobago but light winds generally persist across the islands. Light winds, in combination with increased atmospheric moisture, continue to create favorable conditions showers and isolated thunderstorms.

Showers and thunderstorms are flaring up associated with low-level convergence across Trinidad and Tobago, as well as Tropical Wave 30 east of the islands, with its axis along 47/48W. It is forecast to move across our area tomorrow. Credit: Weathernerds.org
Showers and thunderstorms are flaring up associated with low-level convergence across Trinidad and Tobago, as well as Tropical Wave 30 east of the islands, with its axis along 47/48W. It is forecast to move across our area tomorrow. Credit: Weathernerds.org

A cluster of showers and, at times, thunderstorms are present across eastern coastal waters of Trinidad, gradually moving westward. This cluster is forecast to bring isolated to scattered showers, periods of rain (mainly across Southern and Eastern Trinidad) overnight.

Note that there is a large area of mostly clear skies between the leading edge of Tropical Wave 30. This is forecast to move across Trinidad and Tobago during the first half of Tuesday, allowing similar conditions to Monday to occur.

Daytime heating with high atmospheric moisture will trigger showers and isolated thunderstorms on Tuesday, again over the same areas as today. During the second half of the day, T&T will begin to be affected by Tropical Wave 30.

Tropical Wave 30 looks impressive presently on satellite imagery, but convection fluctuates, which means that when it moves across T&T tomorrow, it may be an entirely different looking tropical wave, with minimal convection. This is what models are indicating. However, with a feature called a Convectively Coupled Kelvin Wave moving across the Atlantic, convection is likely to persist, which models are not picking up.

Technical talk aside, what does this mean for you? Showers and thunderstorms interrupting partly cloudy to mostly cloudy skies – which may produce street/flash flooding and gusty winds.

This activity tomorrow is forecast to persist into the evening, gradually improving on Wednesday as an Atlantic high-pressure system becomes the dominant feature.

7:05 PM Monday 29th July 2019 Radar Update: Isolated showers occurring across Northeastern Trinidad, with a cluster of showers and thunderstorms east and southeast of T&T presently. Image: Trinidad and Tobago Meteorological Service
7:05 PM Monday 29th July 2019 Radar Update: Isolated showers occurring across Northeastern Trinidad, with a cluster of showers and thunderstorms east and southeast of T&T presently. Image: Trinidad and Tobago Meteorological Service

Rainfall accumulations are generally forecast to be between 20-40 millimeters across both islands. Heavier totals tomorrow are forecast to favor Northwestern and generally south-facing slopes of the Northern Range, interior Central Trinidad, and coastal Eastern Trinidad

Winds are generally forecast between 15-25 KM/H by the late afternoon, with gusts up to 50 KM/H at times. Saharan dust is minimal to negligible across Trinidad and Tobago.

Street/flash flooding is possible as these showers are fairly slow-moving. Gusty winds may occur in the vicinity or during heavy showers and/or thunderstorms. Landslides may occur in landslide-prone areas.

Temperatures

Last night’s minimum temperatures were a chilly 22.9°C at Piarco, Trinidad, and 24.7°C at Crown Point, Tobago. Tonight’s minimum temperatures are forecast to be near 25°C at Piarco, Trinidad, and 26°C at Crown Point, Tobago.

Today’s maximum high temperatures across T&T was 32°C at Piarco, Trinidad and 31°C at Crown Point, Tobago. Tomorrow, similar maximum high temperatures are forecast. Heat indices may top at 37°C across Trinidad and 34°C across Tobago. The heat index is an index that combines air temperature and relative humidity, generating a “feel’s like” temperature.

Seas

Seas are forecast to remain moderate in open waters through the next day or so. Waves in open waters are forecast between 1.5 to 2.0 meters, particularly East of Trinidad and Tobago. In sheltered areas, seas to remain near calm through the weekend with winds at 10-15 knots from the south to southeast.

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