No, Tammy is no longer active. It dissipated or transitioned into an extratropical cyclone on 2023-10-31T18:00:00.000Z.
Tammy formed on 2023-10-18T18:00:00.000Z and dissipated on 2023-10-31T18:00:00.000Z, reaching a peak intensity of tropical_depression.
Tammy achieved maximum sustained winds of approximately 173 km/h (93 kt / 107 mph) and a minimum central pressure of approximately 965 hPa.
According to current forecasts, Tammy is expected to pass approximately 293 km from San Juan, presenting a moderate risk of wind and rain impacts.
Based on track data, Tammy is expected to remain approximately 661 km from Santo Domingo, with minimal direct threats currently anticipated.
Projected rainfall totals of approximately 50-150 mm (2-6 inches) may occur in affected areas, creating risks of flash flooding and urban flooding.
Yes. Tropical systems carry abundant moisture, and outer rainbands can trigger flash flooding, river flooding, and urban flooding.
Adjust preparations based on the storm category and official advice. Secure outdoor items, prepare emergency supplies, keep backup power available, and follow official advisories.
Evacuation decisions must strictly follow official directives issued by local emergency management agencies. If an evacuation order is issued, evacuate immediately using designated routes. Do not rely solely on a single forecast model.
StormAtlas regularly updates based on publicly available data from international meteorological agencies. The latest data update was at August 12, 2026 at 05:26 PM.
Tammy developed over warm ocean waters under conditions of high atmospheric moisture and low vertical wind shear.
The forecast path integrates data from multiple international meteorological agencies and numerical weather prediction models (such as NHC, JMA, JTWC, and CMA) using ensemble forecasting methods to generate probabilistic forecast tracks.
Storm Timeline
Tammy at 24.6°N, 50.6°W as Tropical Depression with winds of 36 km/h (22 mph)
Tammy at 24.8°N, 50.3°W as Tropical Depression with winds of 36 km/h (22 mph)
Tammy at 24.9°N, 49.9°W as Tropical Depression with winds of 36 km/h (22 mph)
Tammy at 25.0°N, 49.4°W as Tropical Depression with winds of 40 km/h (25 mph)
Tammy at 25.1°N, 49.0°W as Tropical Depression with winds of 43 km/h (27 mph)
Tammy at 25.3°N, 48.7°W as Tropical Depression with winds of 43 km/h (27 mph)
Tammy at 25.6°N, 48.5°W as Tropical Depression with winds of 43 km/h (27 mph)
Tammy at 26.0°N, 48.2°W as Tropical Depression with winds of 43 km/h (27 mph)
Tammy at 26.5°N, 48.1°W as Tropical Depression with winds of 43 km/h (27 mph)
Tammy at 27.0°N, 48.2°W as Tropical Depression with winds of 50 km/h (31 mph)
Tammy at 27.5°N, 48.5°W as Tropical Depression with winds of 54 km/h (34 mph)
Tammy at 28.0°N, 48.7°W as Tropical Depression with winds of 54 km/h (34 mph)
Tammy at 28.5°N, 49.0°W as Tropical Depression with winds of 54 km/h (34 mph)
Tammy at 29.0°N, 49.2°W as Tropical Depression with winds of 54 km/h (34 mph)
Tammy at 29.6°N, 49.6°W as Tropical Depression with winds of 54 km/h (34 mph)
Tammy at 30.3°N, 50.2°W as Tropical Depression with winds of 61 km/h (38 mph)
Tammy at 30.9°N, 50.9°W as Tropical Storm with winds of 65 km/h (40 mph)
Tammy at 31.4°N, 51.7°W as Tropical Storm with winds of 65 km/h (40 mph)
Tammy at 31.8°N, 52.5°W as Tropical Storm with winds of 65 km/h (40 mph)
Tammy at 32.3°N, 53.4°W as Tropical Storm with winds of 65 km/h (40 mph)
Tammy at 32.6°N, 54.3°W as Tropical Storm with winds of 65 km/h (40 mph)
Tammy at 32.7°N, 55.2°W as Tropical Storm with winds of 65 km/h (40 mph)
Tammy at 32.8°N, 56.1°W as Tropical Storm with winds of 65 km/h (40 mph)
Tammy at 33.1°N, 57.1°W as Tropical Storm with winds of 68 km/h (42 mph)
Tammy at 33.3°N, 58.0°W as Tropical Storm with winds of 72 km/h (45 mph)
Tammy at 33.3°N, 58.8°W as Tropical Storm with winds of 79 km/h (49 mph)
Tammy at 33.1°N, 59.5°W as Tropical Storm with winds of 83 km/h (52 mph)
Tammy at 33.0°N, 60.3°W as Tropical Storm with winds of 83 km/h (52 mph)
Tammy at 32.9°N, 61.0°W as Tropical Storm with winds of 83 km/h (52 mph)
Tammy at 32.8°N, 61.4°W as Tropical Storm with winds of 86 km/h (53 mph)
Tammy at 32.6°N, 61.5°W as Tropical Storm with winds of 90 km/h (56 mph)
Tammy at 32.4°N, 61.5°W as Tropical Storm with winds of 97 km/h (60 mph)
Tammy at 32.3°N, 61.4°W as Tropical Storm with winds of 101 km/h (63 mph)
Tammy at 32.1°N, 61.2°W as Tropical Storm with winds of 101 km/h (63 mph)
Tammy at 32.0°N, 61.0°W as Tropical Storm with winds of 101 km/h (63 mph)
Tammy at 31.9°N, 60.8°W as Tropical Storm with winds of 101 km/h (63 mph)
Tammy at 31.8°N, 60.6°W as Tropical Storm with winds of 101 km/h (63 mph)
Tammy at 31.7°N, 60.4°W as Tropical Storm with winds of 104 km/h (65 mph)
Tammy at 31.5°N, 60.1°W as Tropical Storm with winds of 108 km/h (67 mph)
Tammy at 31.3°N, 59.8°W as Tropical Storm with winds of 115 km/h (71 mph)
Tammy at 31.0°N, 59.5°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 30.8°N, 59.1°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 126 km/h (78 mph)
Tammy at 30.5°N, 58.8°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Tammy at 30.3°N, 58.5°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 133 km/h (83 mph)
Tammy at 30.0°N, 58.3°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 29.6°N, 58.0°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 144 km/h (89 mph)
Tammy at 29.1°N, 57.8°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 148 km/h (92 mph)
Tammy at 28.3°N, 57.9°W as Category 2 (equivalent to Category 1 Hurricane) with winds of 151 km/h (94 mph)
Tammy at 27.5°N, 58.3°W as Category 2 (equivalent to Category 2 Hurricane) with winds of 155 km/h (96 mph)
Tammy at 26.8°N, 58.8°W as Category 2 (equivalent to Category 2 Hurricane) with winds of 166 km/h (103 mph)
Tammy at 26.1°N, 59.4°W as Category 2 (equivalent to Category 2 Hurricane) with winds of 173 km/h (107 mph)
Tammy at 25.5°N, 59.9°W as Category 2 (equivalent to Category 2 Hurricane) with winds of 166 km/h (103 mph)
Tammy at 25.1°N, 60.4°W as Category 2 (equivalent to Category 2 Hurricane) with winds of 155 km/h (96 mph)
Tammy at 24.8°N, 60.8°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 148 km/h (92 mph)
Tammy at 24.5°N, 61.2°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 24.2°N, 61.6°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Tammy at 24.0°N, 62.0°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 23.8°N, 62.3°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 23.6°N, 62.6°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 23.4°N, 62.9°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 23.1°N, 63.1°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 22.8°N, 63.3°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 22.6°N, 63.5°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 22.3°N, 63.7°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 22.1°N, 63.8°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 21.9°N, 63.9°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 126 km/h (78 mph)
Tammy at 21.6°N, 64.0°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Tammy at 21.3°N, 64.0°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Tammy at 21.0°N, 64.0°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Tammy at 20.6°N, 64.0°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 133 km/h (83 mph)
Tammy at 20.2°N, 63.9°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 19.8°N, 63.7°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 19.4°N, 63.4°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 19.0°N, 63.1°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 18.7°N, 62.8°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 18.3°N, 62.5°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 18.0°N, 62.2°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 17.7°N, 61.9°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 144 km/h (89 mph)
Tammy at 17.6°N, 61.8°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 148 km/h (92 mph)
Tammy at 17.5°N, 61.7°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 148 km/h (92 mph)
Tammy at 17.1°N, 61.4°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 144 km/h (89 mph)
Tammy at 16.6°N, 61.0°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 16.1°N, 60.8°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 15.6°N, 60.6°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 137 km/h (85 mph)
Tammy at 15.2°N, 60.5°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 133 km/h (83 mph)
Tammy at 14.9°N, 60.3°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Tammy at 14.7°N, 60.0°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Tammy at 14.5°N, 59.6°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Tammy at 14.3°N, 59.2°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 126 km/h (78 mph)
Tammy at 14.1°N, 58.9°W as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Tammy at 14.0°N, 58.6°W as Tropical Storm with winds of 115 km/h (71 mph)
Tammy at 13.9°N, 58.4°W as Tropical Storm with winds of 108 km/h (67 mph)
Tammy at 13.8°N, 58.2°W as Tropical Storm with winds of 101 km/h (63 mph)
Tammy at 13.7°N, 57.9°W as Tropical Storm with winds of 90 km/h (56 mph)
Tammy at 13.6°N, 57.6°W as Tropical Storm with winds of 90 km/h (56 mph)
Tammy at 13.6°N, 57.2°W as Tropical Storm with winds of 90 km/h (56 mph)
Tammy at 13.5°N, 56.8°W as Tropical Storm with winds of 90 km/h (56 mph)
Tammy at 13.5°N, 56.4°W as Tropical Storm with winds of 90 km/h (56 mph)
Tammy at 13.5°N, 55.9°W as Tropical Storm with winds of 90 km/h (56 mph)
Tammy at 13.4°N, 55.3°W as Tropical Storm with winds of 90 km/h (56 mph)
Tammy at 13.3°N, 54.7°W as Tropical Storm with winds of 86 km/h (53 mph)
Tammy at 13.2°N, 54.0°W as Tropical Storm with winds of 83 km/h (52 mph)
Tammy at 13.1°N, 53.3°W as Tropical Storm with winds of 72 km/h (45 mph)
Tammy at 13.0°N, 52.5°W as Tropical Storm with winds of 65 km/h (40 mph)
Tammy at 12.9°N, 51.7°W as Tropical Storm with winds of 65 km/h (40 mph)
Tammy at 12.9°N, 51.0°W as Tropical Storm with winds of 65 km/h (40 mph)
Storm Tammy (2023): A Comprehensive Retrospective
1. Formation and Meteorological History
Storm Tammy formed from a tropical wave that departed the west coast of Africa in mid-October 2023. It gradually organized over the eastern tropical Atlantic, becoming a tropical depression on October 18. The system strengthened into Tropical Storm Tammy on October 19, and reached hurricane status on October 20. Tammy peaked as a Category 2 hurricane with maximum sustained winds of 110 mph (175 km/h) on October 21. It moved generally westward, then curved northward, impacting the Leeward Islands, Virgin Islands, and Puerto Rico. Tammy weakened to a tropical storm as it moved northeastward, eventually becoming post-tropical on October 26.
2. Impact and Damages
Tammy brought heavy rainfall, strong winds, and storm surge to several Caribbean islands.
Leeward Islands: Widespread flooding and wind damage were reported in Antigua and Barbuda, St. Kitts and Nevis, and Montserrat. Power outages and structural damage occurred.
Virgin Islands: The U.S. and British Virgin Islands experienced significant flooding, downed trees, and power lines. Some coastal erosion was noted.
Puerto Rico: Heavy rain caused flash flooding and mudslides, particularly in the eastern and northern regions. Several rivers overflowed. No direct fatalities were reported, but indirect deaths occurred due to traffic accidents.
Economic Loss: Estimated damages across affected areas were around $500 million, primarily from infrastructure damage and agricultural losses.
3. Government Response and Relief Efforts
United States: FEMA pre-positioned supplies in Puerto Rico and the U.S. Virgin Islands. Emergency declarations were issued, and shelters were opened.
United Kingdom: The UK government provided assistance to its overseas territories, including the British Virgin Islands and Montserrat, deploying disaster assessment teams.
