Periods of rain, moderate to heavy showers, and thunderstorms have affected Trinidad and Tobago over the last two days. This activity has mainly been associated with an active Intertropical Convergence Zone (ITCZ). With the ITCZ remaining present, Tropical Wave 25 on the approach, and river levels elevated, the Met Office has replaced the Localized Flood Alert with a Riverine Flood Alert.
What you need to know
— Rainfall: Through the next 24-48 hours, additional rain, moderate to heavy showers, and isolated thunderstorms are forecast, interrupting variably cloudy skies across both islands. Peak intense activity, including isolated heavy to violent showers and intense thunderstorms, is forecast from the early morning through the afternoon, gradually settling by the evening. Additional showers and thunderstorms are forecast to develop during Saturday morning across Trinidad. Overall rainfall totals between 25 and 75 millimeters are forecast across both islands, trending higher across eastern and southern areas of Trinidad and Tobago, as well as along western coastal Trinidad. Isolated totals may accumulate up to 150 millimeters, particularly across the eastern half of Trinidad.
— Hazards: Chances for street/flash flooding are high to very high through Saturday, with riverine flooding ongoing. Severe flooding, similar to the October 2018 Greenvale Floods, is not expected. Gusty winds in excess of 45 KM/H accompanying heavy showers or thunderstorms are likely. Lightning will accompany thunderstorms. Landslides are possible across northeastern areas of Trinidad and Tobago.
— Alerts/Watches/Warnings: The Trinidad and Tobago Meteorological Service has upgraded the Localized Flood Alert (Yellow Level) to a Riverine Flood Alert (Yellow Level) on Thursday at 8:56 PM. The alert goes into effect at 9:00 PM Thursday, August 4th, 2022, and remains in effect through 8:00 PM Friday, August 5th, 2022. There are no tropical storm or hurricane watches or warnings in effect for T&T at this time.
The Riverine Flood Alert
The Trinidad and Tobago Meteorological Service has upgraded the Localized Flood Alert (Yellow Level) to a Riverine Flood Alert (Yellow Level) on Thursday at 8:56 PM. The alert goes into effect at 9:00 PM Thursday, August 4th, 2022, and remains in effect through 8:00 PM Friday, August 5th, 2022.
Trinidad and Tobago is not under any tropical storm watch or warning at this time.
“The Localized Flood Alert is now being upgraded to a Riverine Flood Alert. Trinidad’s major water courses have reached or exceeded threshold capacities. TTMS has received numerous reports of ongoing riverine flooding across Trinidad, particularly from the Caroni and South Oropouche rivers and their tributaries with flood waters currently rising in a few communities. Periods of rainfall are forecasted for tonight and tomorrow with a 60% chance of heavy showers and/or thunderstorms expected, which may delay the subsidence of flood waters. This can be exacerbated at high tides which is currently ongoing (peak high tide was at 8:29 p.m) and again at approximately 9 a.m. and 9 p.m. (5th August).” according to the Trinidad and Tobago Meteorological Service. This “alert” status takes into account the possibility of the event occurring. This riverine flood event has been observed.
The color of the alert indicates the severity of the event and the probability of the event occurring. Currently, the alert level is Yellow. This means that the hazards have been observed, but the severity of impacts is moderate for this particular alert. You should be aware of the hazards in your area associated with street, flash, and possible minor to moderate riverine flooding.
For a moderate Riverine Flood Alert, there is the potential for possible injuries, where behavioral changes are required to ensure safety. There may be minor damage to property, with income-earning temporarily disrupted and a couple of communities affected.
The Met Office is advising the public to carefully monitor weather conditions and river/water levels. Monitor updates from official sources and plan safety measures, and do not take unnecessary risks. Avoid driving or wading through flood waters. Follow the instructions of government officials.