Hazardous Seas Alert In Effect For The Next 7 Days, Beginning on Sunday.

The Hazardous Seas Alert

The Trinidad and Tobago Meteorological Service has issued a Hazardous Seas Alert for all coastlines of Trinidad and Tobago, with the exception of the southern coastline of Trinidad. The alert goes went into effect at 11:00 AM Sunday, October 27th, 2019 through 2:00 PM Saturday 2nd November 2019. This is in line with much of the global wave modeling.

Trinidad and Tobago is NOT under any tropical storm threat, watch or warning.

Based on the latest model guidance and analysis, long period swells are forecast to begin on Sunday afternoon through the following Saturday afternoon. The effects will be exacerbated by ongoing spring tides. Elevated tides are ongoing due to New Moon occurring on Sunday 27th October, with elevated tides ongoing through October 31st.

These swells are originating from a large low-pressure system, in the Central North Atlantic Ocean.

Generally, battering waves in nearshore areas are forecast to begin on Sunday, particularly during high tide periods. Coastal flooding is also likely in low-lying coastal areas, which will be enhanced by Spring Tides. Beach and coastal erosion are likely, particularly along Northern and sheltered coastlines. Overall, there is a high risk of rip currents and large waves at beaches through next Saturday, so disruptions to beachgoers and marine interests are expected.

Information from the Trinidad and Tobago Meteorological Service concerning the Hazardous Seas Alert for October 27th to November 2nd 2019

“Long-period north-easterly swells are forecast to affect nearshore activity in northern, sheltered and to a lesser extent eastern coastal areas. Effects are usually in the form of occasional battering waves, which can lead to disruption to sea bathing and other nearshore coastal activities. In some cases, mild coastal flooding and damage/erosion is also possible. Spring tides are also in effect, which will enhance near-shore impacts during high tides.” according to the Trinidad and Tobago Meteorological Service. This “alert” status takes into account the possibility of the event occurring. This hazardous seas event is likely.

The color of the alert indicates the severity of the event and the probability of the event occurring. Currently, the alert level is at Yellow. This means that the hazard is likely and you need to be aware of the impacts of hazardous seas in your area. Moderate impacts are expected, so there is the chance of possible injuries and persons would need to take action to ensure safety. There may be minor damage to property.

Image Credit: Trinidad and Tobago Meteorological Service
Image Credit: Trinidad and Tobago Meteorological Service

Sea Conditions For The Next 7 Days

The Takeaway: Based on the latest model guidance and analysis, long period swells are forecast through next week, beginning on Sunday and lasting through next Saturday. Spring Tides are forecast to subside by Thursday. A Hazardous Seas Alert goes into effect at 11:00 AM on Sunday.

During high tide periods, as noted below, coastal flooding is likely along Mosqutio Creek and other low-lying coastal areas. Peak swells are forecast on Sunday night through Tuesday night, and again on Thursday night into Saturday.

Peak Spring Tides occurs from Saturday 26th October to Thursday 31st October.

Approximate high tides for Trinidad and Tobago are seen below. Mosquito Creek can expect coastal flooding during these times, particularly 30 minutes prior and 30 minutes after when peak high tides occur. Similar conditions are forecast elsewhere during these high tide periods in low-lying coastal areas throughout the week.

High Tide Forecast for Trinidad over the next 7 days as the Hazardous Seas Alert goes into effect at 11 AM Sunday through 2 PM Saturday.
High Tide Forecast for Trinidad over the next 7 days as the Hazardous Seas Alert goes into effect at 11 AM Sunday through 2 PM Saturday.
High Tide Forecast for Tobago over the next 7 days as the Hazardous Seas Alert goes into effect at 11 AM Sunday through 2 PM Saturday.
High Tide Forecast for Tobago over the next 7 days as the Hazardous Seas Alert goes into effect at 11 AM Sunday through 2 PM Saturday.

On days where localized, afternoon, thunderstorms and heavy showers occur, mainly across Western Coastal Trinidad, onshore winds resulting from this activity may exacerbate coastal flooding.

The general sea state throughout the week is as follows:

PM Sunday 27th Oct. – PM Tuesday 29th Oct.: Moderate to Rough, with waves generally above 1.5 meters to 2.0 meters in open waters, occasionally above to 2.5 meters, particularly across Eastern coastal waters. In sheltered areas, near 1.0 meters but choppy. Long Period Swells ongoing.

AM Wednesday 30th Oct. – PM Thursday 31st Oct.: Slight to Moderate, with waves generally between 1.5 meters to 2.0 meters in open waters, occasionally above 2.0 meters. In sheltered areas, near 1.0 meters but choppy. Long Period Swells ongoing.

PM Thursday 31st Oct. – PM Monday 4th November (beyond the expiration of the Hazardous Seas Alert): Moderate, with waves above 1.5 meters, up to 2.0 meters and occasionally up to 2.5 meters, particularly in Eastern Coastal waters on Saturday into Sunday. In sheltered areas, near 1.0 meters but choppy. Long Period Swells to subside by late Saturday.

Impacts to T&T’s Shorelines

High tides combined with onshore wind and swell actions could result in localized coastal flooding and beach erosion.

Saltwater will likely splash onto low-lying coastal roads such as the South Trunk Road at Mosquito Creek, the Guayaguayare Mayaro Road at the Guayaguayare Sea Wall, and the Manzanilla-Mayaro Road.

Coral reefs may experience increased stress and damages, in addition to localized beach erosion, particularly in areas where battering waves focus.

There is also the potential for loss of life. There is a high risk of rip currents, strong currents that can carry even the strongest swimmers out to sea.

Rip currents are powerful channels of water flowing quickly away from the shore, which occur most often at low spots or breaks in the sandbar and near structures such as groins, jetties, and piers. If caught in a rip current, relax and float. Don’t swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.

There is also the potential for injuries to beachgoers; beach closures; localized disruptions to marine recreation and businesses and financial losses.

High surfs can knock spectators off exposed rocks and jetties. Breaking waves may occasionally impact harbours making navigating the harbour channel dangerous. This may be exacerbated during the afternoon, localized thunderstorms and heavy showers across Western coastal Trinidad.

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