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KNMI – Tropical Cyclone bulletin

Dutch Meteorological Institute – KNMI



Date: Sunday September 03, 2017 Time: 05:09 local time


There are no watches or warnings in effect at this time. At 500 AM AST (0900 UTC), the eye of Hurricane Irma was located near latitude 18.0 North, longitude 47.5 West. Irma is moving toward the west-southwest near 15 mph (24 km/h), and this course at a slightly slower forward speed is expected through tonight. A turn toward the west is forecast on Monday. Maximum sustained winds have increased to near 115 mph (185 km/h) with higher gusts. Irma is a category 3 Hurricane on the Saffir-Simpson Hurricane Wind Scale. Some additional strengthening is forecast through Monday night. Hurricane-force winds extend outward up to 25 miles (35 km) from the center, and tropical-storm-force winds extend outward up to 80 miles (130 km).

Effect on local conditions

Winds: Tuesday evening and on Wednesday there is a moderate probability (around 60%) that tropical-storm-force winds (exceeding 34 kt) related to Hurricane Irma will reach the islands. The probability for Hurricane-force winds (exceeding 64 kt) is 20-30% during the same period.


Waves are building up to 10-15 ft and may reach values around 20 ft later on Wednesday.


From later on Tuesday till Thursday high amounts of rainfall are expected. Amounts of 2 to 4 inches are likely.

Local authorities and residents of Saba and St. Eustatius are advised to continue monitoring the further progress of this weather system and to take all necessary measures to safeguard life and property.

Center’s latest and forecast positions:

Sun Sep 03 05:00 (lt) 18.0N 47.5W Hurricane 1600 km east of Saba and St. Eustatius
Sun Sep 03 14:00 (lt) 17.5N 49.1W Hurricane 1430 km east of Saba and St. Eustatius
Mon Sep 04 02:00 (lt) 16.8N 51.3W Hurricane 1200 km east of Saba and St. Eustatius
Mon Sep 04 14:00 (lt) 16.5N 53.4W Hurricane 980 km east of Saba and St. Eustatius
Tue Sep 05 02:00 (lt) 16.5N 55.7W Hurricane 740 km east of Saba and St. Eustatius
Wed Sep 06 02:00 (lt) 17.8N 60.6W Hurricane 220 km east of Saba and St. Eustatius
Thu Sep 07 02:00 (lt) 20.0N 66.0W Hurricane 470 km northwest of Saba and St. Eustatius
Fri Sep 08 02:00 (lt) 22.5N 71.5W Hurricane 1100 km northwest of of Saba and St. Eustatius


TROPICAL CYCLONE INFORMATION BULLETIN: An information bulletin for possible tropical cyclone conditions, including possible sustained winds within the range ≥118 km/h (≥ 74 mph) (≥64 knots) are expected in specified areas in 72 hours or less.

Next bulletin: Sunday September 03, 2017, 17:09 local time

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KNMI: MODERATE risk for tropical storm winds from hurricane Irma (Updated)