Tropical Wave 21 – Live Updates

This post will be updated over the next 48-72 hours as Tropical Wave 21 moves across Trinidad, Tobago, and the Windward Islands.Street/Flash flooding, gusty winds, landslides/mudslides, downed trees & utility poles possible.


9:10 AM Monday 15th July 2019

Although the Adverse Weather Alert is now cancelled by the Trinidad and Tobago Meteorological Service for Northern Trinidad and Tobago, showers and thunderstorms are still likely over the next 24-72 hours due to the ITCZ lingering across the region.



8:00 PM Monday 15th July 2019

The axis of Tropical Wave 21 is now west of Trinidad and Tobago, after a night of moderate to strong thunderstorms producing locally heavy rainfall across parts of the Windward Islands and gusty winds.

Trinidad started off the day with sunny and clear skies as the early morning thunderstorm moved out of the area. Across Tobago, partly cloudy skies are occurring. The ITCZ remains across the Windward Islands, including Trinidad and Tobago. High total precipitable moisture and generally favorable conditions are in place for the development of additional showers and possible thunderstorms by the late morning through the afternoon.

Winds from the east-southeast to southeast will keep these showers moving west-northwest, avoiding parts of Southwestern and possibly Northwestern Trinidad. Note that due to local climatic features, heavier showers are possible or may be enhanced by hilly areas, including the above areas, the Northern Range and Tobago.

Regardless, the forecast for today calls for isolated to scattered showers developing by the late morning through the afternoon across both islands with a few becoming heavy or developing into thunderstorms. These showers are forecast to interrupt sunny to partly cloudy skies and will subside by nightfall.

The ITCZ will remain across the region, and another round of showers and thunderstorms are possible beginning after midnight on Tuesday, this time favoring Southern and Central Trinidad but possible across both islands.

Activity associated with Tropical Wave 21 is moving west, away from Trinidad, Tobago and the Lesser Antilles. The ITCZ remains across the region so isolated to scattered showers, cloudiness and thunderstorms remain in the forecast for the Windward Islands. Gusty winds, street flooding, landslides/mudslides, and downed trees all possible. Credit: Weathernerds.org
Activity associated with Tropical Wave 21 is moving west, away from Trinidad, Tobago and the Lesser Antilles. The ITCZ remains across the region so isolated to scattered showers, cloudiness and thunderstorms remain in the forecast for the Windward Islands. Gusty winds, street flooding, landslides/mudslides, and downed trees all possible. Credit: Weathernerds.org


2:00 AM Monday 15th July 2019

Scattered showers with moderate to heavy rainfall are occurring across Tobago and mainly North of Trinidad. Street flooding, gusty winds and landslides possible.

The Adverse Weather Alert from the Trinidad and Tobago Meteorological Service is now in effect through 12:00 PM Monday.

2:00 AM Monday 15th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing scattered showers approaching and affecting the northern half of Trinidad and Tobago.
2:00 AM Monday 15th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing scattered showers approaching and affecting the northern half of Trinidad and Tobago.


1:15 AM Monday 15th July 2019

An isolated thunderstorm and moderate to strong convection are developing across Tobago and east of the island, generally moving westward. Street/Flash flooding, frequent lightning, and thunder as well as gusty winds possible, mainly across Tobago.

Scattered showers are also approaching and occurring across Trinidad, across the northern half of the island.



1:00 AM Monday 15th July 2019

At 1:00 AM, sustained winds of 50 KM/H have been recorded at Grantley Adams International Airport, Barbados and at the Hewanorra International Airport in St. Lucia.

 Winds and gusts at Grantley Adams International Airport, Barbados as Tropical Wave 21 moves across the region.
Winds and gusts at Grantley Adams International Airport, Barbados as Tropical Wave 21 moves across the region.
Winds and gusts at Hewanorra International Airport in St. Lucia as Tropical Wave 21 moves across the region.


1:00 AM Monday 15th July 2019

Scattered showers are approaching the northern half of Trinidad and Tobago. An isolated thunderstorm is affecting the western half of Tobago with thunder, lightning and heavy rainfall reported.

Intermittent scattered showers and isolated thunderstorms are forecast to continue throughout Monday. The Adverse Weather Alert from the Trinidad and Tobago Meteorological Service goes into effect beginning at 2:00 AM Monday (today).

1:00 AM Monday 15th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing scattered showers approaching the northern half of Trinidad and Tobago, with an isolated thunderstorm affecting the western half of Tobago.
1:00 AM Monday 15th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing scattered showers approaching the northern half of Trinidad and Tobago, with an isolated thunderstorm affecting the western half of Tobago.
2-Minute lighting strike counts between 1:01 AM and 1:03 AM as a thunderstorm occurs across Western Tobago.


11:00 PM Sunday 14th July 2019

At 11:00 PM, sustained winds of 61 KM/H with a wind gust of 107 KM/H was recorded at the Hewanorra International Airport in St. Lucia.

Winds and gusts at Hewanorra International Airport in St. Lucia as Tropical Wave 21 moves across the region.
Winds and gusts at Hewanorra International Airport in St. Lucia as Tropical Wave 21 moves across the region.

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7:00 PM Sunday 14th July 2019

Most of the heavy showers and thunderstorms are occurring north of Trinidad and Tobago at this time. Barbados, Grenada, St. Vincent and the Grenadines and St. Lucia may continue to see showers and thunderstorms as the night progresses.

An isolated thunderstorm is producing lightning activity off the southwestern coast of Trinidad. Across Trinidad and Tobago, increasing cloudiness is forecast as the night progresses with intermittent showers continuing to favor Northern Trinidad and Tobago.

Gusty winds, street flooding, landslides/mudslides, and downed trees/utility poles are all possible.

Tropical Wave 21 is nearing Trinidad, Tobago and the Lesser Antilles. Scattered showers and locally heavy showers/thunderstorms are ongoing, mainly north of Trinidad, Tobago and approaching the Southern Windwards. Gusty winds, street flooding, landslides/mudslides, and downed trees all possible. Credit: Weathernerds.org


6:00 PM Sunday 14th July 2019

Street flooding is ongoing along the Western Main Road between St. James and Westmoorings. Delay travel if possible. Several areas across Northwestern Trinidad are experiencing street flooding at this time.



5:45 PM Sunday 14th July 2019

An isolated thunderstorm is moving away from Northwestern Trinidad after producing heavy showers across the area with violent rainfall rates in excess of 80 millimeters/hour. A personal weather station in Carenage picked up just over 15 millimeters in under 20 minutes. Stronger showers and thunderstorms remain north of Trinidad and Tobago, likely to affect parts of Grenada & St. Vincent and the Grenadines.



5:32 PM Sunday 14th July 2019

A wind gust of 59 KM/H with sustained winds of 32 KM/H was recorded at Grantley Adams International Airport, Barbados.

Across Barbados, gusty winds have accompanied showers and isolated thunderstorms, with its peak over the last 12 hours occurring between 11:00 AM and 12:00 PM today, with winds gusting to 67 KM/H and sustained winds at 43 KM/H.

Nearby airports at Trinidad, Tobago, Grenada and St. Vincent have been reporting sustained winds generally below 30 KM/H with no significant gusts at this time.

Gusty winds up to 65 KM/H possible over the next 24 hours as Tropical Wave 21 moves across the region.



4:45 PM Sunday 14th July 2019

Adverse Weather Alert issued for Northern Trinidad and Tobago. In effect from 2:00 AM Monday through 12:00 PM Monday.

Street/flash flooding, landslides/landslips and gusty winds in excess of 45 KM/H are possible according to the Trinidad and Tobago Meteorological Service.

Note that due to favorable atmospheric conditions, locally severe thunderstorms are possible, producing heavy rainfall and gusty winds. We (TTWC) went into detail about this system in our earlier update.



3:30 PM Sunday 14th July 2019

Scattered showers and thunderstorms are occurring across parts of Grenada and St. Vincent and the Grenadines. Showers across Trinidad are generally occurring across the Northern Range and Eastern coastal areas with isolated showers and cloudy skies across Tobago.

Street/Flash flooding and gusty winds possible across parts of St. Vincent, the Grenadines and Grenada as thunderstorms move across those islands.

Weather advisories are in place for Grenada as well as St. Vincent & The Grenadines due to Tropical Wave 21.

Tropical Wave 21 is nearing Trinidad, Tobago and the Lesser Antilles. Scattered showers and locally heavy showers/thunderstorms are ongoing, mainly north of Trinidad, Tobago and approaching the Southern Windwards. Gusty winds, street flooding, landslides/mudslides, and downed trees all possible. Credit: Weathernerds.org
Tropical Wave 21 is nearing Trinidad, Tobago and the Lesser Antilles. Scattered showers and locally heavy showers/thunderstorms are ongoing, mainly north of Trinidad, Tobago and approaching the Southern Windwards. Gusty winds, street flooding, landslides/mudslides, and downed trees all possible. Credit: Weathernerds.org


3:10 PM Sunday 14th July 2019

An isolated thunderstorm is occurring across the Southwestern area of the Gulf of Paria, producing heavy to violent rainfall rates in excess of 50 millimeters/hour. Frequent lightning has also been detected as this lone thunderstorm progresses west-southwest away from Trinidad.

2-Minute lighting strike counts between 3:05 PM and 3:07 PM as a thunderstorm moves away from Trinidad’s Southwestern Coast.
3:00 PM Sunday 14th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing an isolated thunderstorm moving away from Trinidad's southwestern coast with another cluster of showers approaching Northeastern Trinidad.
3:00 PM Sunday 14th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing an isolated thunderstorm moving away from Trinidad’s southwestern coast with another cluster of showers approaching Northeastern Trinidad.


2:00 PM Sunday 14th July 2019

Tropical Wave 21, previously Invest 93L, forecast to bring intermittent showers and thunderstorms to the Windwards over the next 48-72 hours, interrupting partly cloudy to cloudy skies.

Much of the heavier showers and thunderstorms are forecast to move north of T&T, mainly affecting Tobago. Regardless, locally heavy rainfall, street/flash flooding and gusty winds possible across both islands, particularly on Monday and Tuesday.


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