CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Watch is in effect for...
- Bermuda A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. For storm information specific to your area, please monitor products issued by your national meteorological service.

WIND: Tropical storm conditions are possible across Bermuda and the nearby waters on Tuesday, particularly to the south of the island.

At 500 AM AST (0900 UTC), the center of Tropical Depression Eight was located near latitude 32.4 North, longitude 62.9 West. The depression is moving toward the south southwest near 5 mph (7 km/h) and this motion is expected to continue this morning. A slow clockwise turn toward the southwest and west is anticipated during the next couple of days, followed by a continued westward motion on Wednesday. On the forecast track, the center of the depression will pass to the southeast and south of Bermuda during the next few days. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Slow strengthening is forecast and the system is forecast to become a tropical storm later today. The estimated minimum central pressure is 1012 mb (29.89 inches).

Satellite imagery and radar data from Bermuda indicate that the tropical depression located about 100 nmi east of Bermuda has been moving southward and also remains a sheared tropical cyclone -- the ongoing saga of the Atlantic basin thus far this hurricane season. Convection has increased and developed closer to the center and a late-arriving ASCAT-C overpass indicated surface winds of 26-27 kt to the south of the well-defined circulation center. Based on those data, the slightly improved convective structure noted in both satellite and radar data, and satellite classifications of T2.0/30 kt, the initial intensity has been increased to 30 kt.

The initial motion estimate is 195/04 kt. The small cyclone is starting to make the clockwise turn toward the south-southwest and eventually southwest that the global and regional models have been advertising the past couple of days. The latest NHC model guidance now shows less of a turn to the northwest after 72 hours, with the exception of the GFS, GFS-ensemble, and HMON models, which continue to take the cyclone northward and northeastward around Bermuda on day 4 and 5. The latest NHC track forecast is similar to the previous advisory track through 60 hours, and then widens the track slightly thereafter, but still shows a complete clockwise turn. This track scenario is to the right of the consensus models at all forecast periods, and is of low confidence on days 4 and 5.

The vertical wind shear is forecast to remain at or below 10 kt for the next 36 hours or so, and that is most likely the time when the cyclone will strengthen. Thereafter, an increase in the shear to 20 kt or more is expected to cap the intensification process. The HWRF model turn the cyclone into a major hurricane by 72 hours, but this scenario is considered to be an extreme outlier given the amount of shear forecast to affect the system on days 3-5. So far this season, the HWRF model has been very shear resistant and has had a high intensity bias. The official intensity forecast closely follows a blend of the IVCN and HCCA consensus models through 60 hours, and then is below those models due to the high-bias contribution of the HWRF model.