Tropical Storm Dorian Producing Significant Flooding Across Martinique

© GRÉGORY GABOURG The village of Rivière-Pilote flooded.

As Tropical Storm Dorian moves across the Windward Islands, showers and thunderstorms have dumped copious amounts of rainfall across Martinique, triggering widespread street and flash flooding across the island. Gusty winds are also ongoing across the island as a Tropical Storm Warning remains in effect.

Caribbean Radar Composite Imagery as bands of Tropical Storm Dorian moves across the Lesser Antilles on Tuesday morning.
Caribbean Radar Composite Imagery as bands of Tropical Storm Dorian moves across the Lesser Antilles on Tuesday morning.

As of 8:45 AM, peak sustained winds of 37 KM/H and wind gusts to 57 KM/H have been recorded at the Le Lamentin Airport, Martinique. Over the last 8 hours, nearly 100 millimeters have fallen across the region.

France weather services, Meteo France, recorded on average more than 60mm of rainfall in the south (Sainte-Luce, Trois-Ilets, Ducos, in particular).

Flash flooding ongoing across Rivière-Pilote, Martinique. Video: Frédérique Corriols
Flash flooding ongoing across Saint-Esprit, Martinique. Video: Gaëtan M-Bz
Flash flooding ongoing across Rivière-Salée, Martinique. Video: Julien Villet

Update on Tropical Storm Dorian

As of 8:00 AM, Tropical Storm Dorian is located 25 kilometers west-northwest of St. Lucia in the Caribbean Sea.

The center of Tropical Storm Dorian was located by surface observations and Martinique radar data near latitude 14.0 North, longitude 61.2 West. Dorian is moving toward the west-northwest near 20 KM/H, and this motion is expected to continue through tonight, followed by a turn toward the northwest on Wednesday.

On the forecast track, the center of Dorian will move across the eastern and northeastern Caribbean Sea during the next few days, passing near or south of Puerto Rico on Wednesday, move near or over eastern Hispaniola Wednesday night, and move north of Hispaniola on Thursday.

Watches & Warnings (8:00 AM Tuesday)

Hurricane Watch: Puerto Rico and the Dominican Republic from Isla Saona to Samana. A Hurricane Watch means that hurricane conditions are possible within the watch area. A watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous.

Tropical Storm Warning: Martinique, St. Vincent and the Grenadines and Puerto Rico. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. Note that this warning only considers tropical-storm-force winds and not associated rainfall, storm surge, and other hazards.

Tropical Storm Watch: Dominica, Grenada and its dependencies, Saba and St. Eustatius and the Dominican Republic from Isla Saona to Punta Palenque as well as the Dominican Republic from Samana to Puerto Plata. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. Note that this warning only considers tropical-storm-force winds and not associated rainfall, storm surge, and other hazards.

Interests in the Virgin Islands should monitor the progress of Dorian.

Maximum sustained winds are near 85 KM/H with higher gusts to 100 KM/H. Slow strengthening is forecast during the next 48 hours, and Dorian is forecast to be near hurricane strength when it moves close to Puerto Rico and eastern Hispaniola.

Tropical-storm-force winds extend outward up to 75 kilometers from the center. The estimated minimum central pressure is 1005 millibars.

Hazards Affecting Land

Rainfall: Dorian is expected to produce the following rain
accumulations through Thursday:

  • Barbados – Additional rainfall up to 1 inch (25 mm), storm total around 6 inches (150 mm).
  • The Windward Islands from Martinique to Saint Vincent – 3 to 6 inches (75-150 mm), isolated 10 inches (250 mm).
  • Grenadines to Grenada – 1 to 3 inches (25-75 mm).
  • The Leeward Islands from Guadeloupe to Dominica – 1 to 4 inches (25-100 mm).
  • Puerto Rico and Saint Croix – 2 to 4 inches (50-100 mm), isolated 6 inches (150 mm).
  • Dominican Republic – 2 to 4 inches (50-100 mm), isolated 6 inches (150 mm).

This rainfall may cause life-threatening flash floods, especially where totals exceed 4 inches.

Wind: Tropical storm conditions are occurring in portions of the tropical storm warning area in the Lesser Antilles and these conditions are expected to continue during the next several hours. Tropical storm conditions are expected and hurricane conditions are possible in Puerto Rico on Wednesday.

Hurricane conditions are possible in the hurricane watch area in the Dominican Republic by late Wednesday and tropical storm conditions are possible in the tropical storm watch area beginning late Wednesday. Tropical storm conditions are possible within the tropical storm watch area in the Lesser Antilles today.

Seas: Swells generated by Dorian are affecting portions of the Lesser Antilles and they should continue during the next several hours. Swells are expected to increase along the southern coasts of Puerto Rico and Hispaniola on Wednesday and they could cause life-threatening surf and rip current conditions. Please consult products from your local weather office.

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