Live Updates: Inclement Weather Reports from Tropical Wave 17

This post will be updated over the next few hours as Tropical Wave 17 moves across Trinidad, Tobago, and the Windward Islands.

2:30 PM Tuesday 9th July 2019

Flash flooding is ongoing along the Caparo Valley Brasso Road, in the vicinity of Breeding Unit has heavy rainfall overwhelmed the smaller drains in the area. Note that the Caparo River remains within its banks as of 2:30 PM Tuesday.

Flash flooding is ongoing along the Caparo Valley Brasso Road, in the vicinity of Breeding Unit, Central Trinidad
Flash flooding is ongoing along the Caparo Valley Brasso Road, in the vicinity of Breeding Unit, Central Trinidad


1:30 PM Tuesday 9th July 2019

In meteorology, training denotes repeated areas of rain, typically associated with thunderstorms, that move over the same region in a relatively short period of time. Training thunderstorms are capable of producing excessive rainfall totals, often causing flash flooding. The name training is derived from how a train and its cars travel along a track (moving along a single path), without the track moving.

Across Central Trinidad, a favorable area of low-level convergence has developed, triggering a line of persisting showers and thunderstorms moving west-northwest over the same areas. Over the last three hours, (11:00 AM through 1:00 PM) areas across parts of Central Trinidad have accumulated up to 30 millimeters of rainfall.

Areas that are prone to street/flash flooding should be aware of possible impacts, such as temporarily impassable roadways.

Street/Flash flooding is likely imminent or ongoing across the below-mentioned areas.

The one good piece of news coming out of these training showers and thunderstorms are the replenishment of the Navet Reserviour, where heavy showers continue to persist.

There is an increased risk of street/flash flooding across Central Trinidad this afternoon through this evening due to training showers and possible thunderstorms. Note this information, with the exception of the Radar Image (Trinidad and Tobago Meteorological Service), is from Trinidad and Tobago Weather Center and was not endorsed by the Trinidad and Tobago Meteorological Service


12:55 PM Tuesday 9th July 2019

Moderate showers are ongoing across Northwestern and West-Central Trinidad, with a line of showers and possible thunderstorms oriented WNW-ESE continues to move across Trinidad.

Locally heavy showers, gusty winds likely across Central Trinidad as these showers and possible thunderstorms make its way across the island, moving generally west to west-northwest.

These showers are forming due to a favorable area of convergence behind the passage of Tropical Wave 17, with favorable upper level divergence supporting heavy showers and thunderstorm activity.

Mostly settled conditions are likely by the late afternoon through the evening, with increasing Saharan Dust by late Tuesday into Wednesday. Air quality to be reduced to moderate levels.

12:45 PM Tuesday 8th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing scattered showers occurring across Trinidad.


12:45 PM Tuesday 9th July 2019

Street flooding is ongoing along the Freeport Mission Road, in the vicinity of Rampersad Medical Center. Minor traffic delays are occurring.

Street flooding is ongoing along the Freeport Mission Road, in the vicinity of Rampersad Medical Center. Minor traffic delays are occurring. Flooding occurred due to heavy thunderstorms and showers as Tropical Wave 17 affects the area.


12:15 PM Tuesday 9th July 2019

Violent rainfall rates are occurring across parts of Freeport, with rates between 70-140 millimeters per hour. Street flooding likely.



11:50 AM Tuesday 9th July 2019

A line of thunderstorms is moving west-northwest across Central Trinidad presently. Gusty winds, locally heavy rainfall and frequent lightning are ongoing.

Over the last 5 minutes, 77 lightning strikes have been detected, with 520 lightning strikes detected in the past hour. 277 of these strikes have been dangerous cloud-to-ground lightning.

Remain indoors if possible until these thunderstorms subside.

2-Minute lighting strike counts between 11:46 AM and 11:48 AM as a thunderstorm moves across Northwestern Trinidad.


11:15 AM Tuesday 9th July 2019

Scattered showers and isolated thunderstorms are moving across Trinidad, interrupting partly cloudy skies. Mostly sunny skies to return to Trinidad by the late afternoon, with partly cloudy skies prevailing across Tobago presently.

Locally heavy rainfall likely, with street flooding, gusty winds possible, mainly across Western Trinidad.

The axis of Tropical Wave 17 is now west of T&T.

 9:35 PM Monday 8th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing scattered to widespread showers approaching Tobago.
11:15 AM Tuesday 8th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing scattered showers occurring across Trinidad.


9:45 PM Monday 8th July 2019

Scattered to widespread showers are approaching Tobago, with moderate to heavy rainfall. Showers east of the islands are moving west-northwest. Hence, showers and thunderstorms across Trinidad are forecast to begin after midnight, as the axis of Tropical Wave 17 progresses westward.

9:35 PM Monday 8th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing scattered to widespread showers approaching Tobago.


7:00 PM Monday 8th July 2019

Showers and thunderstorms are still forecast for Trinidad and Tobago, particularly after midnight tonight through the first half of Tuesday. However, much of the heavier showers and thunderstorms are likely to remain offshore, mainly affecting parts of Northeastern Trinidad and Tobago.

Street/Flash flooding, gusty winds up to 60 KM/H, frequent lightning and landslides are all possible, particularly across Northern, Eastern Trinidad, and Tobago.

Showers and the isolated thunderstorm are still possible across the remainder of Trinidad, but areas across Western and Southwestern Trinidad may not see the much needed (wanted) rainfall overnight.



3:00 PM Monday 8th July 2019

Showers and thunderstorms continue to near the Windward Islands, with thunderstorms now taking aim at Grenada and St. Vincent. Scattered showers are occurring mainly in coastal waters and across Tobago, with generally cloudy skies across the region, with the exception of the Southern half of Trinidad.

Winds from the east-southeast to southeast over the last few hours have kept showers and thunderstorms away from Southern and SW Trinidad, hence the presently sunny skies.

Additional showers likely across T&T, although a lull in activity is presently occurring, later this evening and overnight tonight, with the bulk of inclement weather forecast mainly after midnight tonight.

GOES-East Visible Satellite Imagery, overlaid with the flash count density from the GOES-East GLM over the last 15 minutes as of 3:00 PM Monday, showing a strong thunderstorm west of Northwestern Trinidad, with two weaker thunderstorms North of Tobago, nearing Eastern Grenada and another east of St. Vincent, per lightning detection.
GOES-East Visible Satellite Imagery, overlaid with the flash count density from the GOES-East GLM over the last 15 minutes as of 3:00 PM Monday, showing a strong thunderstorm west of Northwestern Trinidad, with two weaker thunderstorms North of Tobago, nearing Eastern Grenada and another east of St. Vincent, per lightning detection.


2:20 PM Monday 8th July 2019

A thunderstorm is moving across Northwestern Trinidad, with frequent lightning being detected. This thunderstorm is producing rainfall rates as high as 60 millimeters/hour and gusty winds as it moves across Carenage, Chaguaramas as surrounding areas.

2-Minute lighting strike counts between 2:17 PM and 2:19 PM as a thunderstorm moves across Northwestern Trinidad.


1:50 PM Monday 8th July 2019

Violent rainfall rates being detected by the Trinidad and Tobago Meteorological Service. Very heavy showers across Western Trinidad, including western coastal waters as well as an isolated heavy shower across Southern Trinidad are producing rainfall rates in excess of 100 millimeters/hour.

dBZ stands for decibel relative to Z, the reflectivity factor. It is a logarithmic dimensionless technical unit used in radar, mostly in weather radar, to compare the equivalent reflectivity factor (Z) of a radar signal reflected off a remote object to the return of a droplet of rain with a diameter of 1 mm.

In the below image, we see several areas where reflectivity at upper levels (between 3-5 kilometer altitude) are in excess of 60 dBZ, which if it was at the surface, would be indicative of a violent rainfall rate of 167 millimeter/hour OR extreme/moderate hail.

The isolated shower across South-Central Trinidad has this reflectivity reading at the surface (>60 dBZ) which means that violent rainfall is occurring, likely with accompanying gusty winds between New Grant and Rio Claro.

We’ve received no reports of hail, but heavy rainfall was occurring, according to residents living in the area.

1:40 PM Monday 8th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service. This view gives a 2-D appearance of showers and thunderstorms in the area, allowing the viewer to see the structure of the showers and thunderstorms.


1:40 PM Monday 8th July 2019

Isolated thunderstorms have developed north and west of Tobago, as well as across West-Central Trinidad. These thunderstorms, as well as ongoing showers are forecast to continue its west-northwestward path away from Trinidad.

In the last hour, as of 1:40 PM, 125 lightning strikes were detected. Note that most of these strikes were as a result of distant thunderstorms, not activity on land Trinidad and Tobago.

Tropical Wave 17 is nearing Trinidad, Tobago and the Lesser Antilles. Scattered showers and locally heavy showers/thunderstorms are ongoing, lingering through the first half of Tuesday. Gusty winds, street flooding, landslides/mudslides, and downed trees all possible through Tuesday, particularly across Trinidad and Tobago. Credit: Weathernerds.org


12:45 PM Monday 8th July 2019

As forecast, scattered showers are ongoing across Trinidad and Tobago, with isolated heavy pockets. Additional scattered showers are forecast to move across Trinidad and Tobago over the next several hours, with heavier showers favoring Eastern and Northern Trinidad.

12:30 PM Monday 8th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing scattered showers approaching Trinidad and Tobago.


11:45 AM Monday 8th July 2019

Scattered light to moderate showers, with isolated heavy pockets, are approaching Trinidad and Tobago. Heavier showers are likely to favor Trinidad, while moderate to light showers favoring Tobago, through the early afternoon.

11:30 AM Monday 8th July 2019: Radar Update from the Trinidad and Tobago Meteorological Service showing scattered showers approaching Trinidad and Tobago.


11:00 AM Monday 8th July 2019

The axis of the tropical wave remains well east of Trinidad and Tobago, but scattered showers and possible thunderstorms are nearing the islands. Activity forecast to begin after midday across both islands, lingering into the night and Tuesday with intermittent showers.

Gusty winds, street/flash flooding, landslides all possible over the next 24-36 hours.



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