Live Updates – Tropical Wave 04

Tropical Wave 04 has moved across Trinidad and Tobago early Saturday 30th May 2020. Following the passage of this wave, periods of showers and thunderstorms are possible, mainly overnight Saturday through Sunday afternoon. Locally heavy rainfall may trigger street or flash flooding. Gusty winds up to 55 KM/H may cause downed trees, utility poles, and lines, as well as brief power outages. The chances for landslides/landslips remain very low, as much of the heavy rainfall is forecast to remain south and east of T&T. Live updates for this event have now ended.

Locally Heavy Rainfall With Tropical Wave 04

8:45 PM Sunday 31st May 2020

Early morning thunderstorm activity across Trinidad gradually subsided as the day progressed, with light showers and periods of rain across the island. Mostly cloudy to overcast skies persisted across both islands as upper level clouds moved off the coast of South America, streaming across Trinidad and Tobago

Satellite image loop from 8:00 AM to 8:00 PM Sunday 31st May 2020 as Tropical Wave 04 moves west of Trinidad and Tobago
Satellite image loop from 8:00 AM to 8:00 PM Sunday 31st May 2020 as Tropical Wave 04 moves west of Trinidad and Tobago

This was not forecast to be a widespread heavy rainfall event, with most areas receiving little rainfall, less than 10 millimeters, with isolated totals up to 40 millimeters. Heavier showers were forecast to favor offshore areas.

These totals generally verified, with most areas receiving near to less than 10 millimeters, with isolated totals (where rainfall recording stations are located) up to 25 millimeters.

Thankfully, there were no widespread reports of street flooding, with our sole report coming in early this morning along the M1 Tasker Road, Princes Town.

Between 5:00 AM and 6:00 AM, heavy to violent rainfall rates were recorded across parts of Central and Southern Trinidad, up to 40 millimeters per hour, with stations located in Brasso Venado and San Fernando recording upwards of 20 millimeters of rainfall within the hour.

24-hour rainfall accumulations across Trinidad and Tobago following the passage of Tropical Wave 04
24-hour rainfall accumulations across Trinidad and Tobago following the passage of Tropical Wave 04

Conditions are forecast to become increasingly hazy Sunday night into Monday, with shower chances decreasing. Isolated showers are still possible with thunderstorms unlikely (until Friday). Mostly sunny to partly cloudy conditions and hazy skies to persist through the week, with our next tropical wave bringing better widespread rainfall chances on Friday through the weekend.



Thunderstorms Produce Frequent Lightning Across Trinidad, Heavy Rainfall

6:15 AM Sunday 31st May 2020

Presently, thunderstorms across Central Trinidad are gradually moving west and northwest across the island, producing frequent lightning, power dips, gusty winds and locally heavy rainfall across the area. Since 5:00 AM, 1,091 lightning strikes have been detected, with 532 being dangerous cloud-to-ground strikes.

Lightning strikes as of 6:03 AM across Trinidad, associated with thunderstorms following the passage of Tropical Wave 04
Lightning strikes as of 6:03 AM across Trinidad, associated with thunderstorms following the passage of Tropical Wave 04

Through today, isolated to scattered showers and isolated thunderstorms are forecast to persist through Sunday afternoon, interrupting mostly cloudy to overcast skies.

As abundant low-level moisture is forecast to move across T&T on Sunday, with southeasterly winds. This means sea-breeze convergence, daytime heating, and orographic effects may trigger showers and isolated thunderstorms during the late morning through the afternoon. There may be the occasional enhancement from gust fronts as wind shear causes activity east of Trinidad and Tobago to dissipate, generating said gust fronts.

Particularly during heavy to violent showers and thunderstorms on Wednesday, with gusty winds up to 55 KM/H. Seas to remain moderate, with waves up to 2 meters in open waters, but may become choppy during heavy showers and thunderstormsStreet/flash flooding is possible, with the threat of landslides low.

Conditions are forecast to settle by the evening as a high-pressure system rebuilds across the region, becoming increasingly hazy due to the surge of Saharan Dust that follows.

Overall rainfall accumulations are forecast to remain low, generally less than 10 millimeters in most areas. Isolated totals in areas that receive multiple heavy/violent showers, thunderstorms or isolated downpours may see up to 40 millimeters.



(Update) Frequent Lightning Ongoing Across Trinidad

5:30 AM Sunday 31st May 2020

Frequent lightning associated with thunderstorms across South-Central Trinidad ongoing across the area. 39 strikes have been detected across the area per minute as of 5:26 AM, with over 470 strikes detected within the last hour. 231 of these strikes have been dangerous cloud-to-ground lightning strikes.

Update: 5:28 AM – Lightning strikes up to 72 strikes per minute. Power dips are being reported across parts of West-Central Trinidad. Gusty winds, frequent lightning, locally heavy rainfall likely.

Lightning strikes as of 5:28 AM across Trinidad, associated with thunderstorms following the passage of Tropical Wave 04


Trinidad’s First Thunderstorms For 2020

5:05 AM Sunday 31st May 2020

Trinidad’s first thunderstorms for 2020 are ongoing across South-Central Trinidad. Isolated to scattered showers ongoing elsewhere. Lightning, locally heavy rainfall, street flooding & gusty winds possible.



Isolated to Scattered Showers, Periods of Rain Affecting T&T

4:45 AM Sunday 31st May 2020

Isolated to scattered showers, generally moderate to heavy, and periods of rain are ongoing across Trinidad and Tobago. Isolated pockets of deeper convection are developing across Eastern Trinidad which may develop into thunderstorms.

Across Western areas, including San Fernando and Couva, moderate to heavy rainfall is ongoing, with a personal weather station at Couva recording rainfall rates up to 40 millimeters/hour.

Heavy rainfall associated with showers due to the passage of Tropical Wave 04
Heavy rainfall associated with showers due to the passage of Tropical Wave 04


Gusty Winds, Showers Move Across Tobago

3:30 AM Sunday 31st May 2020

As moderate to heavy showers move across Trinidad and Tobago, gusty winds are possible across both islands. At Scarborough, winds gusted to 41.7 KM/H with sustained winds at 22.7 KM/H.

Locally moderate to heavy rainfall is ongoing as of 3:30 AM across Southern and Eastern Trinidad, with isolated showers elsewhere across both islands.

Gusty winds associated with showers due to the passage of Tropical Wave 04
Gusty winds associated with showers due to the passage of Tropical Wave 04


Isolated Showers Approaching T&T

1:25 PM Sunday 31st May 2020

An isolated heavy shower is approaching Tobago, with isolated showers and light rain ongoing across Eastern and Southern Trinidad.

Additional showers are approaching Trinidad from the east.

Isolated Heavy Showers Approaching Tobago

1:25 AM – An isolated heavy shower is approaching Tobago, with isolated showers and light rain ongoing across Eastern and Southern Trinidad. Additional showers are approaching Trinidad from the east. https://ttweathercenter.com/live-updates-tropical-wave-04/

Posted by Trinidad and Tobago Weather Center on Saturday, May 30, 2020


Light Rain, Showers Ongoing Across T&T

11:15 PM Saturday 30th May 2020

Isolated showers and light rain ongoing across eastern and southern coastal areas of Trinidad, with brisk activity ongoing across interior areas of the island. Across Tobago, partly to mostly cloudy skies ongoing with the odd isolated shower.

Based on the latest atmospheric sounding (taking a profile of the atmosphere at 7-8 PM) – the atmosphere remains moderately moist and marginally unstable. However, the potential for convection (showers, thunderstorms) remains moderate.

As the night into the morning progresses, isolated showers and the odd thunderstorm is still forecast to develop east of T&T, gradually moving westward.



The 2020 Wet Season Begins

6:30 PM Saturday 30th May 2020

The 2020 Wet Season has been declared by the Trinidad and Tobago Meteorological Service following rainfall activity associated with the passage of a Tropical Wave.

This marks the 6th year in a row the Trinidad and Tobago Meteorological Service has declared the Wet Season in the month of May. The Wet Season typically runs from June through December.



Isolated Showers Moving Across Trinidad
Activity to Increase Overnight

5:30 PM Saturday 30th May 2020

(Tonight) Saturday: Increasingly cloudy conditions, varying between partly to mostly cloudy skies are forecast. Brisk, isolated showers are forecast to favor Tobago and the eastern half of Trinidad through midnight, gradually moving westward and weakening. Locally heavy to violent showers possible with thunderstorm activity remaining offshore.

Gusty winds up to 55 KM/H and street flooding are possible in heavy to violent showers and isolated thunderstorms. Seas to remain moderate, with waves up to 2 meters in open waters, but may become choppy during heavy showers and thunderstorms.

Sunday: After midnight, isolated showers are possible, favoring Eastern Trinidad and Tobago. Upper-level support is forecast to aid in the development of shallow convection (showers) and isolated thunderstorms through the mid-morning through the late afternoon, favoring Trinidad.

As abundant low-level moisture is forecast to move across T&T on Sunday, with southeasterly winds. This means sea-breeze convergence, daytime heating, and orographic effects may trigger showers and isolated thunderstorms during the late morning through the afternoon. There may be the occasional enhancement from gust fronts as wind shear causes activity east of Trinidad and Tobago to dissipate, generating said gust fronts.

Particularly during heavy to violent showers and thunderstorms on Wednesday, with gusty winds up to 55 KM/H. Seas to remain moderate, with waves up to 2 meters in open waters, but may become choppy during heavy showers and thunderstormsStreet/flash flooding is possible, with the threat of landslides low.

Conditions are forecast to settle by the evening as a high-pressure system rebuilds across the region, becoming increasingly hazy due to the surge of Saharan Dust that follows.

Overall rainfall accumulations are forecast to remain low, less than 5-10 millimeters in most areas. Isolated totals in areas that receive multiple heavy/violent showers, thunderstorms or isolated downpours may see up to 40 millimeters.



Wind Shear Getting The Best Of Showers, Thunderstorms East of T&T

3:45 PM Saturday 30th May 2020

Cloudiness is increasing across Trinidad and Tobago, with showers mainly affecting southeastern Trinidad. Wind shear continues to diminish activity east of our islands and showers and thunderstorms gradually move west.

Increasing Cloudiness Across T&T. Showers, Thunderstorms Remain East of Islands

3:45 PM – Mostly sunny conditions are becoming increasingly cloudy, mainly across Trinidad as wind shear dissipates showers south and east of the island. Note that heavier rainfall is still forecast to remain offshore, with showers and isolated thunderstorm activity remaining brisk across land areas. Much of our shower/thunderstorm activity is also still forecast to mainly move across T&T between 12:00 AM and (updated) 4:00 PM on Sunday. https://ttweathercenter.com/tropical-update-weak-tropical-wave-to-bring-showers-on-sunday-monitoring-invest-92l/#tnt

Posted by Trinidad and Tobago Weather Center on Saturday, May 30, 2020


Axis of Tropical Wave 04 West of T&T

2:20 PM Saturday 30th May 2020

The axis of Tropical Wave 04 moved across Trinidad and Tobago early this morning.

Showers Approaching T&T as Axis of TW04 Moves West

2:20 PM – The axis of Tropical Wave 04 is now west of T&T, as forecast. Remember, the axis of a tropical wave typically passes without much change in weather, with active weather (showers, thunderstorms) following. Isolated showers and possible thunderstorms are developing east of T&T, gradually moving westward. Note that heavier rainfall is still forecast to remain offshore, with showers and isolated thunderstorm activity remaining brisk across land areas. Much of our shower/thunderstorm activity is also still forecast to mainly move across T&T between 12:00 AM and 2:00 PM on Sunday. https://ttweathercenter.com/tropical-update-weak-tropical-wave-to-bring-showers-on-sunday-monitoring-invest-92l/#tnt

Posted by Trinidad and Tobago Weather Center on Saturday, May 30, 2020


Not Every Tropical Wave Brings Heavy Rainfall

Friday 29th May 2020

Early season tropical waves tend to be weak. As the last few that have moved across T&T have shown, they sometimes move…

Posted by Trinidad and Tobago Weather Center on Friday, May 29, 2020


Not A Heavy Rainfall Event For T&T

Friday 29th May 2020

Much of the rainfall associated with Tropical Wave 04 is forecast to remain east of Trinidad. However, late morning through afternoon showers on Saturday and activity between 12 AM and 2 PM on Sunday may bring some rainfall to the islands.



Weak Tropical Wave to Move Across T&T Saturday Into Sunday

Friday 29th May 2020

A weak tropical wave is forecast to move across T&T over the next 36 hours, increasing chances for showers and isolated thunderstorms through the first half of Sunday.



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