The Hazardous Seas Alert
The ongoing Hazardous Seas Alert has been extended for the 4th time until 4:00 PM Friday 17th January 2020. This extension is in line with global wave modeling as rough seas continue in our open waters. Finally, seas are forecast to return to moderate levels overnight tonight into early Friday in line with the alert and global wave models.
Trinidad and Tobago is NOT under any tropical storm threat, watch or warning.
Based on the latest model guidance and analysis, rough seas are forecast to subside by late Thursday into early Friday, with rough seas (waves in excess of 2.5 meters) subsiding into Friday. Hence, this should be the final extension of this alert.
Generally, battering waves in nearshore areas are forecast to continue through tomorrow, particularly during high tide periods. Coastal flooding is also likely in low-lying coastal areas. Beach and coastal erosion are likely, particularly along Northern and Eastern coastlines. Overall, there is a high risk of rip currents and large waves at beaches so disruptions to beachgoers and marine interests are expected.
Information from the Trinidad and Tobago Meteorological Service concerning the Hazardous Seas Alert for January 8th to January 17th, 2020.
“The strength of low-level winds has decreased, however, waves are still reaching up to 3.0 m in open waters based on numerous reports. Rough sea conditions are expected to continue until Friday 17th January 2020.” 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 observed.
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 observed 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.
7-Day Sea Forecast
Rough and hazardous seas began on late last Thursday as a strong high-pressure system builds across the entire region, bringing strong low-level winds between 20 to 25 knots (37-46 KM/H), and gusts to 70 KM/H.
Strong low-level winds have agitated coastal waters, predominantly eastern coastal areas of Trinidad and all coastal areas of Tobago over the last week and will continue through tomorrow. This rough seas event is carded to end tomorrow, with seas returning to moderate levels by late Friday through Sunday.
Another short-lived rough seas event is forecast to begin on Sunday through Tuesday 21st January 2020.
In addition, long period swells (with 11-16 second periods) are forecast to begin affecting T&T’s coastal waters, originating from the North and Northeast. These swells will mainly affect Northern, Eastern, and Western coastal waters of both islands between Sunday 19th January and Tuesday 21st January.
The general sea state through the next 7 days is as follows:
Thursday 16th January 2020: Rough, with waves generally between up to 3.0 meters in open waters, occasionally up to 3.5 meters. In sheltered areas, near 1.0 meters. This is the last day of the ongoing rough seas event which plagued the Caribbean region for the last week.
Friday 17th through Saturday 19th January 2020: Moderate, with waves up to 2.5 meters throughout the period. Long-period northerly swells are forecast to persist. Winds will be between 10-15 knots from the east to northeast. In sheltered areas, waves are forecast to be near or below 1.0 meters.
Monday 20th January 2020: Rough, with waves generally between up to 3.0 meters in open waters, occasionally up to 3.5 meters. In sheltered areas, near 1.0 meters, occasionally up to 1.5 and choppy. Long Period Swells to affect the region yet again. This the peak of this brief rough seas event.
Tuesday 21st January 2020: Rough, with waves up to 3.0-3.2 meters throughout the day, gradually subsiding to 2.5 meters into Wednesday 22nd January 2020.
Approximate high tides for Port of Spain, Trinidad, and Scarborough, Tobago are seen below. Low-lying coastal areas may experience coastal flooding, particularly 30 minutes prior and 30 minutes after when peak high tides occur.
Marine interests are advised to prepare for adverse sea conditions and beachgoers are advised to refrain from heading to bays and beaches beginning late Thursday.
Impacts on T&T’s Shorelines
Impacts possible from rough seas include the following:
- Loss of life;
- Sea search and rescue disruptions;
- Disruptions to sea transportation;
- Scarcity of seafood;
- Damage or loss of boats and fishing equipment;
- Disruptions to marine recreation and businesses
- Economic losses.
Other impacts from the high winds, apart from hazardous seas, include:
- Coastal erosion;
- Localized disruptions of businesses;
- Disruption to outdoor and sporting activities;
- Disruption of transportation (air and especially sea) and
Wind of this strength could make some outdoor activities uncomfortable, if not outright dangerous. High winds can create dangerous fallen or blowing objects.
The strongest winds and the highest and most dangerous seas will begin on Thursday. The highest seas will take place in the Atlantic waters of the islands.
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 tides combined with onshore wind and swell actions could result in localized coastal flooding and beach erosion.
High surfs can knock spectators off exposed rocks and jetties. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous.
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. Bays and beaches may become inundated.
Coral reefs may experience increased stress and damages, in addition to localized beach erosion, particularly in areas where battering waves focus.
Note that for those still heading to the beaches, particularly along Eastern coastlines, a significant amount of seafoam may be whipped up due to strong winds.