Live Updates – Tropical Wave 36 & The ITCZ

This inclement weather event has ended.


10:00 PM Saturday 17th August 2019

A cluster of showers is presently moving across Eastern Trinidad, gradually moving westward. Generally light to moderate showers are forecast mainly for the Southern half of Trinidad over the next hour.

10:00 PM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


8:30 PM Saturday 17th August 2019

A line of light to moderate showers are moving across Eastern and Central Trinidad. A cluster of showers, at times moderate to heavy, are approaching Southern and Central Trinidad, forecast to move across the southern half of Trinidad over the next 2 hours.

8:15 PM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


6:45 PM Saturday 17th August 2019

A thunderstorm across extreme southwestern Trinidad is producing frequent lightning, visible as far as Central Trinidad.

6:30 PM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service
Lightning strikes between 6:45 PM and 6:47 PM


5:00 PM Saturday 17th August 2019

Mostly hot and sunny conditions are ongoing across Trinidad with isolated moderate to heavy showers ongoing across the Eastern half of Tobago. A couple of thunderstorms are ongoing South and North of Trinidad.

5:00 PM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


3:00 PM Saturday 17th August 2019

Mostly hot and partly cloudy skies ongoing across Trinidad, with a few isolated showers approaching Tobago and ongoing across northwestern Trinidad.

3:00 PM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


2:30 PM Saturday 17th August 2019

Isolated showers continue across Northwestern Trinidad, with a few isolated showers approaching the Southern Coast of Tobago, approximately 1-2 hours away.

2:30 PM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


1:55 PM Saturday 17th August 2019

Slow-moving showers continue to favor Northwestern and Western Trinidad. Street flooding, gusty winds possible as there are three locally heavy areas ongoing.

1:45 PM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


1:00 PM Saturday 17th August 2019

As expected, heavier showers are developing along the southern slopes of the Northern Range. These showers are favoring Northwestern Trinidad, with light showers ongoing across parts of Tobago and Northeastern Trinidad, with generally cloudy skies.

Street flooding and gusty winds possible across Northwestern Trinidad.

1:00 PM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


12:00 PM Saturday 17th August 2019

Isolated showers are ongoing across the Northwestern areas of the Northern Range, with showers approaching the Maracas Bay, Las Cuevas with a few heavy pockets. Watch out for falling branches and street/flash flooding on the North Coast Road. Across Tobago, light showers are ongoing with mostly hot and sunny conditions ongoing elsewhere across Trinidad.

12:00 PM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


11:30 AM Saturday 17th August 2019

But the conditions are hot and sunny? Why are we forecasting showers and possible thunderstorms across the Northern half of Trinidad?

Presently, Tropical Wave 36 is located just west of T&T on Saturday morning. Because of the location of the wave, winds are now from the south to southeast. This means showers will take a near north to a northwesterly path across Trinidad.

Radar-detected low-level winds across Trinidad as between 10:30 AM and 11:45 AM Saturday morning, with the wind barbs (red) showing the speed and direction from winds at low-levels of the atmosphere. Imagery from the Trinidad and Tobago Meteorological Service

Because of these very light, southerly to southeasterly winds, moisture and any convective activity will move across the hilly terrain of Trinidad and Tobago, and quite slowly. Winds across the Northern Range will be forced upwards, creating an orographic lift. This phenomenon, simply put, aid in the development of showers, or enhance showers and thunderstorms.

This wave has dragged the ITCZ across T&T and the Southern Windwards yet again, and is likely to remain across Trinidad and Tobago through the weekend.

All of the ingredients are in place for shower and thunderstorm development, with favorable upper-level divergence, low-level convergence, ample moisture through most areas of the atmosphere, wind shear has markedly decreased and there is little impeding convective activity. However, there is a dry pocket at the mid-levels, likely due to the relatively dense surge of Saharan Dust that moved through the region yesterday.

With these features coming together, showers and thunderstorms are likely across mainly Northern Trinidad and Tobago throughout the next few hours. Because of the slow movement, if thunderstorms develop, there is an increased risk of street/flash flooding.

Based on the latest model guidance, rainfall totals are likely to remain less than 10 millimeters across both islands, with isolated totals up to 30 millimeters across the Northern half of Trinidad through the next 24 hours.



11:00 AM Saturday 17th August 2019

Hot and sunny conditions continue across Trinidad, with isolated showers favoring the Northern half of Trinidad and Tobago. Similar conditions to prevail through the evening, with increasing showers across the Northern half of Trinidad.

11:00 AM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


10:45 AM Saturday 17th August 2019

No surprise here, the Adverse Weather Alert has been discontinued. Note that by midday, through the late afternoon, isolated to scattered showers and thunderstorms are possible, favoring the Northern half of Trinidad.



10:15 AM Saturday 17th August 2019

The Adverse Weather Alert has been discontinued. An update on this will be posted shortly. Conditions across T&T are generally the same. Though showers across Tobago are now waning, with mostly cloudy to overcast skies. Across Trinidad, an isolated shower has developed along the Central-Northern Range, generally moving northward. No significant impacts expected.

10:15 AM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


9:15 AM Saturday 17th August 2019

Not much has changed over the last hour across Trinidad. Showers across Tobago have become more widespread, but remain light to moderate at times with overcast skies. The forecast remains the same as below.

9:15 AM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


8:00 AM Saturday 17th August 2019

Trinidad remains clear, and even sunny, while Tobago continues to experience intermittent showers. Though the Adverse Weather Alert remains in effect for Trinidad, at least through the late morning, no significant weather is forecast. For Tobago on the other hand, intermittent showers are forecast to continue throughout the day.

8:00 AM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


7:15 AM Saturday 17th August 2019

Much of the activity associated with Tropical Wave 36 continues to favor Tobago. It is increasingly likely that the Adverse Weather Alert may be discontinued for Trinidad due to a lack of showers and thunderstorms traversing the region.

Note that due to winds from the south to southeast, any showers that develop across Trinidad later today will likely become heavy across the southern slopes of the Northern Range. These showers may develop into thunderstorms and present an elevated street/flash flooding risk across the East-West Corridor specifically and the Northern half of Trinidad more generally.

7:15 AM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


4:45 AM Saturday 17th August 2019

Intermittent moderate to heavy showers continue across Tobago, with scattered showers east of Trinidad. These showers are moving in a northwesterly motion, likely to clip parts of Northeastern Trinidad on its projected path. Street flooding and gusty winds possible across Tobago, no significant impacts for Trinidad.

4:45 AM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


3:15 AM Saturday 17th August 2019

Widespread moderate to heavy showers are ongoing across Tobago. Brief street flooding possible. Intermittent showers to continue throughout the night as much of the activity associated with Tropical Wave 36 is now north of Trinidad, moving in a northwesterly motion.

3:15 AM Saturday 17th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


10:00 PM Friday 16th August 2019

Mostly settled conditions are ongoing across Trinidad and Tobago, with brisk, isolated showers across Tobago. Increased showers, mainly across Tobago are forecast.

10:00 PM Friday 16th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


9:00 PM Friday 16th August 2019

A line of brisk, light to moderate showers are moving across Trinidad. No significant impacts beyond a brief shower forecast. These showers will dissipate within the next few hours due to an unfavorable mid-level atmosphere.

9:00 PM Friday 16th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


7:00 PM Friday 16th August 2019

Isolated showers are moving onshore, between Guayaguayare and Mayaro bringing light to moderate showers to the area. Elsewhere, mostly settled conditions are ongoing, with brisk, weak showers. An increase in cloudiness is forecast overnight with showery activity.

7:00 PM Friday 16th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service
7:00 PM Friday 16th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


6:25 PM Thursday 16th August 2019

The axis of Tropical Wave 36 is along 15N, 55W to 7N, 58W and moving westward at 10 knots. The axis of this wave is forecast to move across Trinidad and Tobago overnight.

Showers and isolated thunderstorms are likely over the next 24 hours as the activity associated with Tropical Wave 36 and the ITCZ moves across the region.

Scattered moderate to heavy showers are approaching T&T, associated with Tropical Wave 36 and the ITCZ. Street/flash flooding, landslides, gusty winds possible through Sunday due to Tropical Wave 36 and the ITCZ. Credit: Weathernerds.org
Scattered moderate to heavy showers are approaching T&T, associated with Tropical Wave 36 and the ITCZ. Street/flash flooding, landslides, gusty winds possible through Sunday due to Tropical Wave 36 and the ITCZ. Credit: Weathernerds.org


6:00 PM Friday 16th August 2019

Isolated moderate to heavy showers are approaching southeastern Trinidad, with light to moderate showers approaching elsewhere across Eastern Trinidad. Mostly settled conditions on land across T&T,

6:00 PM Friday 16th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


5:00 PM Friday 16th August 2019

Mostly settled conditions with partly cloudy skies are ongoing across Trinidad and Tobago, with isolated to scattered showers across coastal waters of T&T. Isolated showers are on the approach across Eastern Trinidad, expected to move across land by 6:30 PM.

5:00 PM Friday 16th August 2019 Radar Imagery from the Trinidad and Tobago Meteorological Service


4:00 PM Friday 16th August 2019

No rest for the weary! Tropical Wave 36 is approaching the region overnight, dragging the ITCZ northward yet again.

An Adverse Weather Alert has been issued by the TTMS beginning 4:00 AM Saturday, through 12:00 PM Saturday.

Note that showers and thunderstorms are likely to occur before this period, after nightfall tonight and after the end of the alert on Saturday as the ITCZ remains across T&T.


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