KNMI: Tropical Cyclone Bulletin 11 – Isaac

Weather Saba & Sint Eustatius
Tropical Cyclone Bulletin

Weather Saba & Sint Eustatius
Tropical Cyclone Bulletin

TROPICAL CYCLONE BULLETIN NO. 11

ADVISORY MESSAGE NO. 1

Date: Thursday September 13, 2018 Time: 10:53 local time

Key Messages / Watches and warnings:

—– Tropical Storm wind conditions no longer pose a threat to Saba and St. Eustatius. Therefore, the Tropical Storm Watch for Saba and St. Eustatius has been discontinued.

—– A Tropical Cyclone Advisory concerning rough seas due to Tropical Storm Isaac remains in effect for both Saba and St. Eustatius

—– Isaac is expected to pass 280-310 km (180-190 miles) south of Saba and St. Eustatius this evening.

—– 10% risk of 1.0-2.0 inch rainfall accumulation on Thursday, Friday and Saturday.

—– Highest waves, 8-11 ft this afternoon and evening.

Effect on local conditions

Winds:

This afternoon and evening strong breeze to near gale, 6-7 Bft, gusts up to 45 mph (around 70 km/h). Wind direction is east to northeast. Early Friday winds will become east to southeast and speed will gradually decrease to moderate or fresh, 4-5 Bft.

Seas:

Wave heights of 8-11 ft this afternoon and evening, mainly from easterly directions, with 3-4 ft swell heights. Friday wave heights will gradually decrease to 3-6 ft.

Rainfall:

0.5-1.0 inch, 10% risk of 1.0-2.0 inch rainfall accumulation on Thursday, Friday and Saturday.

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:

SABA:
Till Mon Sep 17 08:00 AST, the nearest position is estimated at:
Thu Sep 13 16:00 AST 14.9N 63.1W Tropical Storm 304 km (189 mi) S of Saba

Thu Sep 13 11:00 AST 14.9N 61.8W Tropical Storm 340 km (211 mi) SSE of Saba
Thu Sep 13 20:00 AST 14.9N 64.2W Tropical Storm 321 km (199 mi) SSW of Saba
Fri Sep 14 08:00 AST 14.9N 67.0W Tropical Storm 504 km (313 mi) SW of Saba
Fri Sep 14 20:00 AST 14.9N 69.8W Tropical Storm 763 km (474 mi) WSW of Saba
Sat Sep 15 08:00 AST 15.0N 72.3W Tropical Storm 1010 km (628 mi) WSW of Saba
Sun Sep 16 08:00 AST 15.5N 76.5W Tropical Storm 1433 km (890 mi) W of Saba
Mon Sep 17 08:00 AST 17.0N 80.5W Tropical Depression 1833 km (1139 mi) W of Saba

ST. EUSTATIUS:
Till Mon Sep 17 08:00 AST, the nearest position is estimated at:
Thu Sep 13 15:00 AST 14.9N 62.9W Tropical Storm 288 km (179 mi) S of St. Eustatius

Thu Sep 13 11:00 AST 14.9N 61.8W Tropical Storm 314 km (195 mi) SSE of St. Eustatius
Thu Sep 13 20:00 AST 14.9N 64.2W Tropical Storm 316 km (196 mi) SSW of St. Eustatius
Fri Sep 14 08:00 AST 14.9N 67.0W Tropical Storm 517 km (321 mi) SW of St. Eustatius
Fri Sep 14 20:00 AST 14.9N 69.8W Tropical Storm 783 km (487 mi) WSW of St. Eustatius
Sat Sep 15 08:00 AST 15.0N 72.3W Tropical Storm 1033 km (642 mi) WSW of St. Eustatius
Sun Sep 16 08:00 AST 15.5N 76.5W Tropical Storm 1458! km (906 mi) W of St. Eustatius
Mon Sep 17 08:00 AST 17.0N 80.5W Tropical Depression 1861 km (1156 mi) W of St. Eustatius

Definitions:

ADVISORY BULLETIN: Heavy rainfall and or rough sea conditions are expected in the specific areas. No Tropical Storm or hurricane is expected

Check out also the US Hurricane Center HERE.

No visit of PCN representative to Saba in September
IND closed August 27-31

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