Event Briefing – Excess Rainfall – Covered Area Rainfall Event – Saint Vincent and The Grenadines- July 1-3 2024 – Saint Vincent and the Grenadines

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Attachments

1 INTRODUCTION

This event briefing describes the impact of rainfall on Saint Vincent and The Grenadines, which was associated with a Covered Area Rainfall Event (CARE) starting on 1 July and ending on 3 July 2024. The Rainfall Index Loss (RIL) for the Covered Area Rainfall Event was below the attachment point of Saint Vincent and The Grenadines’ Excess Rainfall policy and therefore no payout is due to the Government of Saint Vincent and The Grenadines.

2 EVENT DESCRIPTION

On 29 June at 0300UTC, the US National Hurricane Center (NHC) reported that a tropical storm formed in the central tropical Atlantic Ocean, and it was named Beryl. The system proceeded westward with estimated forward velocity of 18 mph (30 km/h), along the southern periphery of a strong subtropical ridge. In the next 30 hours, the tropical storm rapidly intensified due to the low wind shear, the high moisture content and the warm surface temperature over the tropical Atlantic. Thus, on 29 June at 2100UTC it became a hurricane and on 30 June at 1530UTC, it evolved into a Category 4 hurricane, as reported by NHC. At this time, the centre of Beryl was sited near latitude 10.8° North, longitude 54.9° West, about 350 mi (565 km) ESE of Barbados, and it kept proceeding towards the Windward Islands with almost unvaried forward velocity and direction. The maximum sustained winds were estimated at 130 mph (215 km/h) and the minimum central pressure at 962 mb.

During the final hours of 30 June and the first hours of 1 July, despite the environmental conditions that were still supportive for the intensification of the hurricane, an eyewall replacement cycle hindered the further strengthening of the system. Indeed, a new outer eye formed outside the small inner core, weakening the latter and gradually becoming dominant. For this reason, when Beryl started to affect with tropical-storm conditions the Windward Islands, on the first hours of 1 July, it had weakened to a Category 3 hurricane, with maximum sustained winds estimated at 120 mph (195 km/h). During these hours, Beryl passed over the waters between Barbados and Tobago, spreading tropical-storm conditions over these islands, and headed towards Grenada (Figure 1). At 0900UTC the western outer rainband of the hurricane passed rapidly over Saint Vincent and the Grenadines and Grenada, bringing locally intense rainfall over these countries (Figure 3a).

Three hours later, at 1200UTC, Hurricane Beryl strengthened again, due to the completion of the eye replacement cycle and it become a Category 4 hurricane again. The satellite imagery showed the solid ring of deep convection surrounding the warming, well-defined eye of the hurricane (Figure 2). At this time, the precipitation associated with the hurricane’s core started to affect Saint Vincent and the Grenadines and Grenada (Figure 3b). In the following three hours, the precipitation became progressively more intense over these countries, due to the hurricane centre becoming closer, and at about 1500UTC, the NHC reported that Beryl made landfall over Carriacou (Grenada). At this time, the heavy rainfall with the eyewall was over the Grenadines and was brushing the southern coast of Saint Vincent (Figure 3c). During the next three to six hours, Saint Vincent and the Grenadienes experienced constantly moderate to locally intense precipitation as the northern and eastern quadrants of the hurricane, characterized by heavy rainfall, passed over the country (Figure 3d).At 2100UTC, Beryl moved away from the southern Windward Islands, and the associated rainfall ceased over Saint Vincent and the Grenadines. The hurricane continued to proceed west-northwestwards at almost 20 mph (31km/h), towards the central Caribbean Sea.

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Source link : https://reliefweb.int/report/saint-vincent-and-grenadines/event-briefing-excess-rainfall-covered-area-rainfall-event-saint-vincent-and-grenadines-july-1-3-2024 Author : Publish date : 2024-07-19 12:54:05 Copyright for syndicated content belongs to the linked Source .

Event Briefing – Excess Rainfall – Covered Area Rainfall Event – Saint Vincent and The Grenadines- July 1-3 2024 – Saint Vincent and the Grenadines

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