Tropical Weather Summary
2100 UTC 15 August 2008

Atlantic:

Tropical Storm Fay (06L), see tropical cyclone warning below.

Eastern Pacific (east of 180):

1. Tropical Storm Iselle (10E) is located near 17.8°N 111.2°W. Maximum sustained winds are 35 knots, gusting to 45 knots. Estimated minimum central pressure is 1004 hPa, and the system is moving westward at 5 knots. Iselle consists of moderate convection sheared west of an exposed low-level cloud swirl. The shear is expected to persist, followed by the system moving over cooler SSTs after 48 hours or so. 24-hour forecast position is 17.8°N 112.5°W with winds of 30 knots, gusting to 40 knots.

2. An area of low pressure (Invest 95E) is located near 14.6°N 120.5°W. Maximum winds are 20 knots with higher gusts, and minimum pressure is estimated to be 1009 hPa. This system is devoid of significant convection due to strong easterly shear. Tropical cyclone development is no longer expected in this area.

Western Pacific (west of 180):

1. Tropical Storm Vongfong (12W) is located near 32.5°N 139.6°E. Maximum winds are 50 knots, gusting to 65 knots, and minimum pressure is 987 hPa. The system is moving east-northeast at 18 knots. The storm is quite well organized, although it is now feeling the effects of the subtropical westerlies; the low-level circulation is becoming exposed as the system is shuttled off to the east-northeast. SSTs remain fairly warm, but by 24 hours Vongfong will likely have passed the 26°C isotherm and be undergoing extratropical transition. 24-hour forecast position is 34.0°N 144.5°E with winds of 40 knots, gusting to 50 knots.

2. The remnant low of Tropical Depression 11W is located over northern Honshu, Japan. Redevelopment of this system is not expected.

3. An area of disturbed weather (Invest 92W) has formed near 16.0°N 152.0°E. The system is nearly stationary. The system is located in a favorable upper air environment, with low wind shear and favorable divergence aloft. Global models take the system westward with a little intensification. The potential for the development of a significant tropical cyclone in this area within the next 24 hours is poor.

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