Showers, Thunderstorms Due To Potential Tropical Cyclone 9 Influence Affecting T&T

Trinidad and Tobago is not under any tropical storm threat, watch, or warning as Potential Tropical Cyclone Nine is north and west of T&T. There are also no alerts in effect for T&T from the TTMS. However, its influence on our wind regime and moisture associated with the tropical disturbance will allow for showers and thunderstorms to move across our islands through Thursday.

There are several reports of downed trees across parts of Western and Northern Trinidad, sporadic power outages and street flooding. Choppy and moderate seas are ongoing in the Gulf of Paria. Follow along on our Facebook, Twitter and Instagram pages for the latest

Forecast for T&T

Wednesday: As Potential Tropical Cyclone Nine moves to our north, winds are forecast to move from near calm to light but from the south. This will result in showers and thunderstorm activity moving from the south to the north, instead of the usual east to west.

As showers and thunderstorms move across the Northern Range of Trinidad and Main Ridge of Tobago from the south, orographic enhancement is possible, setting up a heavy rainfall threat along the southward facing slopes, meaning the East-West Corridor in Trinidad and all areas of Tobago (due to the island’s small size).

Isolated to scattered showers and thunderstorms are forecast to persist into the night, mainly across Trinidad.

The main hazards would be locally heavy rainfall, reducing visibility, and localized wind damage from wind gusts associated with heavier showers or thunderstorms. Generally, with heavy showers and thunderstorm activity, street flooding, particularly in flood-prone areas or areas with poor drainage, is possible as well as flash flooding. Landslides are also possible in elevated areas of both islands, particularly where heavy rainfall occurs.

Seas to remain moderate, occasionally rough, with waves up to 2.5 meters, occasionally up to 3.0 meters in open waters. In sheltered areas, near 1.0 meter but choppy. Note that in heavier showers or thunderstorms, seas may become locally choppy or rough. Air quality to be at good levels.


Thursday into Friday: As Potential Tropical Cyclone Nine moves to the north and west, winds will continue to move from the south to southeast, moving deep tropical moisture across the islands. Conditions are forecast to be slightly drier, so shower and thunderstorm activity will favor the late mornings through the afternoon, generally interrupting sunny to partly cloudy skies.

As showers and thunderstorms move across the Northern Range of Trinidad and Main Ridge of Tobago from the south, orographic enhancement is possible, setting up a heavy rainfall threat along the southward facing slopes, meaning the East-West Corridor in Trinidad and all areas of Tobago (due to the island’s small size).

The main hazards would be locally heavy rainfall, reducing visibility, and localized wind damage from wind gusts associated with heavier showers or thunderstorms. Generally, with heavy showers and thunderstorm activity, street flooding, particularly in flood-prone areas or areas with poor drainage, is possible as well as flash flooding. Landslides are also possible in elevated areas of both islands, particularly where heavy rainfall occurs. Depending on overall rainfall totals, there may be a very low to low risk of riverine flooding by Thursday.

Seas are forecast to settle, with waves moderate (up to 2.0 meters) on Thursday and moderate to slight on Friday (up to 1.5 meters). In sheltered areas, near to below 1.0 meter. Note that in heavier showers or thunderstorms, seas may become locally choppy or rough. Air quality to be at good levels.

Impacts From Tropical Wave 28

For Trinidad and Tobago, the main hazard is heavy rainfall causing flooding and landslides, with gusty winds also a localized concern, as well as rough seas.

Wind

Across Trinidad and Tobago, wind gusts in excess of 65 KM/H are possible in heavier showers or thunderstorms.

With wind gusts in excess of 65 KM/H, whole trees are expected to be in motion, with tree damage likely. Outdoor objects may topple or become airborne such as garbage cans, potted plants, loose galvanize or construction material, and other outdoor furniture. Tents may jump. Older/weaker trees may fall, bringing down utility poles and lines. Power outages expected, with damage to trees, power lines and small structures possible.

High Wind Event Precautions
High Wind Event Precautions

Rainfall

Overall rainfall accumulations are elevated through Thursday. Generally, up to 50 millimeters of rainfall forecast Wednesday through early Friday, with isolated totals in excess of 75 millimeters in areas of persisting heavy rainfall and thunderstorm activity possible.

Street flooding and flash flooding in heavy to violent showers and thunderstorms are likely across both islands. There is a very low to low chance of riverine flooding across Trinidad. There is a high risk of landslides across both islands

Thunderstorms and Lightning

With thunderstorms, locally severe wind (in excess of 55 KM/H), violent rainfall rates (in excess of 50 millimeters per hour) and lightning are all possible.

Gusty winds and lightning pose a threat to our power grid, causing localized power outages. Lightning may also strike trees, homes, or utility poles, causing damage to property. Lightning can also be deadly to persons outside during a thunderstorm.

Seas and Surf

Seas, mainly on Wednesday, forecast to be moderate to rough, with waves occasionally up to 3.0 meters in open waters. In sheltered areas, up to 1.0 meters and choppy.

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