Live Updates – Tropical Wave 09 & The ITCZ

Tropical Wave 09 is forecast to move across Trinidad and Tobago on June 17th, the start of a multi-day heavy rainfall and severe weather event. Periods of showers, rain, and thunderstorms are expected. Heavy rainfall may trigger street or flash flooding. Gusty winds in excess of 60 KM/H may cause downed trees, utility poles, and lines, as well as brief power outages. Landslides/landslips are possible, particularly by late Wednesday into Thursday. An Adverse Weather Alert (Yellow Level) #2 in effect. Live Updates for Tropical Wave 09 have ended, with Live Updates for Tropical Wave 10 ongoing.

15 – 40 Millimeters of Rainfall Accumulated Across T&T

12:00 AM Thursday 18th June 2020

Based on publicly reporting weather stations across Trinidad and Tobago, much of Trinidad and Tobago saw rainfall accumulations between 15-40 millimeters, with a few areas across Western Trinidad receiving less than 15 millimeters.

Higher rainfall accumulations likely occurred across parts of Eastern and Southeastern Trinidad based on satellite observations where the strongest convection was observed. This was in line with global modeling.

24-Hour Rainfall Accumulations Across Trinidad and Tobago
24-Hour Rainfall Accumulations Across Trinidad and Tobago


Tropical Wave 09 Moves East, Tropical Wave 10 Nears T&T.

10:30 PM Wednesday 17th June 2020

As Tropical Wave 09 moves west, a brief surge of Saharan Dust has moved in across Trinidad and Tobago, ahead of Tropical Wave 10. Model guidance have backed off higher rainfall totals through the next 24-48 hours, likely due to the influence of the Saharan Dust plume on convection.

However, isolated thunderstorms remain in the forecast tomorrow, as well as isolated to scattered showers due to favorable upper-level conditions and abundant moisture moving across the islands, particularly by the mid to late morning on Thursday. Isolated showers are also possible overnight, favoring Trinidad.

Tropical Waves that exist in the Atlantic Basin that have moved/forecast to move across Trinidad and Tobago over the next 5 days as seen on total precipitable water imagery (CIMSS)
Tropical Waves that exist in the Atlantic Basin that have moved/forecast to move across Trinidad and Tobago over the next 5 days as seen on total precipitable water imagery (CIMSS)


Saharan Dust Moves In Across T&T

9:30 PM Wednesday 17th June 2020

Dense Saharan Dust has caught an area of opportunity to move across T&T between Tropical Waves 09 and 10.

Air quality across Tobago has been reduced to unhealthy levels for the entire island for the first time for 2020!

Air Quality Index across Trinidad and Tobago as of 9:00 AM Wednesday 17th June 2020. Dense Saharan Dust is affecting Tobago, slowly moving across Trinidad. Click for more information.


Wind Damage Across Northeastern Trinidad

6:30 PM Wednesday 17th June 2020

Disaster Management field officers as well as tree cutters attached to the Sangre Grande Regional Corporation responded…

Posted by Ministry of Rural Development and Local Government on Wednesday, June 17, 2020


Adverse Weather Alert Extended Until 6 PM Thursday

3:00 PM Wednesday 17th June 2020

Adverse Weather Alert #2 Yellow Level now in effect through 6 PM Thursday as Tropical Wave 10 now approaches the region, interacting with the ITCZ.

Click for details


TW09 Moves West, Showers & Thunderstorms Continue

2:50 PM Wednesday 17th June 2020

The axis of TW09 is now well west of our islands but showers and thunderstorms continue across T&T, with heavier activity favoring Southern and Eastern areas as forecast.

Gusty winds in excess of 60 KM/H, street/flash flooding, frequent lightning possible.



Gusty Winds Cause Wind Damage Across Tobago, Southern Trinidad

1:30 PM Wednesday 17th June 2020



Gusty Winds, Thunderstorms Continue Across Trinidad

1:10 PM Wednesday 17th June 2020

Showers and thunderstorms continue across Trinidad and Tobago, with strong winds continuing to favor Tobago. As of 1:00 PM, Scarborough recorded sustained winds of 38.9 KM/H with gusts to 59.1 KM/H. As of 1:00 PM, TEMA has received reports of two fallen trees, one in Lambeau which blocked a roadway (this has been cleared) and another in Bethel which damaged a home.

Through the afternoon, showers and thunderstorms are forecast continue across Trinidad and Tobago, with locally heavy rainfall, frequent lightning and gusty winds in excess of 60 KM/H.

Street/flash flooding, power dips, reduced visibility, and localized wind damage possible.



Severe Winds Rip Across Scarborough, Tobago

12:15 PM Wednesday 17th June 2020

Beginning 11:00 AM, strong winds began to move across Scarborough, Tobago with sustained winds peaking at 55.8 KM/H and peak gusts at 80.3 KM/H.

Strong winds between 11:00 AM and 12:15 PM were recorded at a weather station in Scarborough, with sustained winds remaining above 40 KM/H and gusts remaining above 55-60 KM/H.

Winds of this strength can down trees, rip off roofs, down power lines and damage small structures.



Gusty Winds Affect Grenada Due To Tropical Wave 09

10:30 – 11:00 AM Wednesday 17th June 2020

Strong thunderstorms and heavy rainfall are affecting parts of Grenada due to Tropical Wave 09, with gusty winds recorded at the Point Salines International Airport between 10:30 AM and 11:00 AM.



Isolated Thunderstorms Affecting Southern, Eastern Trinidad

9:15 AM Wednesday 17th June 2020

As the axis of Tropical Wave 09 moves across Trinidad and Tobago, isolated thunderstorms are affecting parts of Southern and Eastern Trinidad – where the heaviest rainfall accumulations are forecast.

GOES-16 Longwave Infrared Imagery showing showers and thunderstorms associated with Tropical Wave 09 across Trinidad and Tobago (Weathernerds)
GOES-16 Longwave Infrared Imagery showing showers and thunderstorms associated with Tropical Wave 09 across Trinidad and Tobago (Weathernerds)


NHC Maintains Near 0% Chance of Development For Tropical Wave 09

8:00 AM Wednesday 17th June 2020

According to the National Hurricane Center’s Tropical Weather Outlook at 8:00 AM, “Showers and thunderstorms across Trinidad and Tobago and the northeastern coastal sections of Venezuela are associated with a westward-moving tropical wave. Although upper-level winds are forecast to be unfavorable for further development, this system could produce gusty winds and heavy rainfall over these locations during the next day or so.”

Chances for development are now near 0% over the next 48 hours and 5 days respectively.

8:00 AM AST Tropical Weather Outlook from the National Hurricane Center, reducing the chances of Tropical Cyclone Formation of Tropical Wave 09 to near 0%
8:00 AM AST Tropical Weather Outlook from the National Hurricane Center, reducing the chances of Tropical Cyclone Formation of Tropical Wave 09 to near 0%


Unsettled Weather Continues, Spreading Across Tobago

7:05 AM Wednesday 17th June 2020

Gusty winds associated with showers and isolated thunderstorms spread across parts of Tobago, with activity continuing across Trinidad.

Frequent lightning, locally heavy rainfall, gusty winds associated with these showers and thunderstorms may cause power dips, reduced visibility on roadways and street/flash flooding.‬

GOES-16 Longwave Infrared Imagery showing showers and thunderstorms associated with Tropical Wave 09 across Trinidad and Tobago (Weathernerds)
GOES-16 Longwave Infrared Imagery showing showers and thunderstorms associated with Tropical Wave 09 across Trinidad and Tobago (Weathernerds)


Showers, Thunderstorms Affect T&T

5:35 AM Wednesday 17th June 2020

An isolated thunderstorm is affecting West-Central Trinidad, with scattered to widespread showers and rain across both islands. Heavier activity remains offshore, with overall higher rainfall accumulations forecast across Southern and Eastern areas of Trinidad.

GOES-16 Longwave Infrared Imagery showing showers and thunderstorms associated with Tropical Wave 09 across Trinidad and Tobago (Weathernerds)
GOES-16 Longwave Infrared Imagery showing showers and thunderstorms associated with Tropical Wave 09 across Trinidad and Tobago (Weathernerds)


Showers, Thunderstorms Begin After Midnight, As Forecast

1:30 AM Wednesday 17th June 2020

As forecast, isolated to scattered showers are beginning to move across Trinidad and Tobago after midnight. Isolated thunderstorms are also developing across extreme Southern Trinidad.

Although overall heavier activity is forecast to favor Southern and Eastern areas, over the next 2-4 hours, showers and thunderstorms will gradually spread across both islands.



Chances for Tropical Cyclone Development Near 0%

1:00 AM Wednesday 17th June 2020

According to the National Hurricane Center’s Tropical Weather Outlook at 1:00 AM, “Showers and thunderstorms have diminished in association with a tropical wave located a couple of hundred miles east-southeast of the Windward Islands, and upper-level winds are forecast to be unfavorable for further development. This system could still produce gusty winds and heavy rainfall over Trinidad and Tobago and northeastern coastal sections of Venezuela during the next day or so.”

Chances for development are now near 0% over the next 48 hours and 5 days respectively.

1:00 AM AST Tropical Weather Outlook from the National Hurricane Center, reducing the chances of Tropical Cyclone Formation of Tropical Wave 09 to near 0%
1:00 AM AST Tropical Weather Outlook from the National Hurricane Center, reducing the chances of Tropical Cyclone Formation of Tropical Wave 09 to near 0%


T&T’s First Prolonged, Heavy Rainfall Event To Begin At Midnight

8:00 PM Tuesday 16th June 2020

Over the next 5-6 days, four tropical waves are forecast to traverse T&T, in conjunction with the ITCZ, bringing periods of flooding rainfall and gusty winds to the islands.

Beginning after midnight tonight, Tropical Wave 09, which has a low (10%) chance of tropical cyclone development, will begin to affect T&T with periods of showers and thunderstorms throughout tomorrow.

What to expect over the next 6 days:

  • Wednesday: Tropical Wave 09 (Widespread Rainfall, Adverse Weather Alert)
  • Thursday: Tropical Wave 10 (Widespread Rainfall, Adverse Weather Alert)
  • Friday: Brief Saharan Dust Surge
  • Saturday: Trade Wind Surge/Tropical Wave 11
  • Sunday/Monday: Tropical Wave 12
  • Late Monday: Major Saharan Dust Surge


Adverse Weather Alert (Yellow Level) Issued For T&T

3:30 PM Tuesday 16th June 2020

Back-to-back tropical waves and the ITCZ are forecast to bring heavy rainfall, gusty winds and agitated sea conditions to T&T through the remainder of the week.

The Adverse Weather Alert (Yellow Level) will go into effect at 5 AM Wednesday through 4 PM Thursday, though inclement weather may continue through the weekend.



National Hurricane Center Monitoring Tropical Wave 09 For Development

2:00 PM Tuesday 16th June 2020

Since Saturday, we’ve been an eye on Tropical Wave 09 for tropical cyclone formation. At 2:00 PM Monday, the National Hurricane Center gave the wave a low (10%) chance of development over the next 48 hours to 5 days.

1:46 PM – The National Hurricane Center has now given Tropical Wave 09 a low (10%) chance of Tropical Cyclone Formation…

Posted by Trinidad and Tobago Weather Center on Tuesday, June 16, 2020


Another Tropical Wave Forecast To Keep ITCZ Across T&T

Sunday 14th June 2020



Overall Rainfall Accumulations Begin to Increase

Sunday 14th June 2020

Forecast confidence begins to increase as more and more models consistently show the ITCZ moving across T&T, dumping heavy rainfall across the islands.



The ITCZ & Tropical Waves 09 & 10 – T&T’s First Heavy Rainfall Event For 2020

Saturday 13th June 2020

Since Saturday, we’ve been monitoring Tropical Wave 09 and 10 for T&T’s first heavy rainfall event for 2020. We are also keeping an eye on Tropical Wave 09 for tropical cyclone formation.



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