Tropical Storm Hanna

Tropical Storm Hanna is packing 40-kt (45-mph) winds, moving ESE at 13 kt (15 mph). Expected to stay over open water.

At 500 AM AST (0900 UTC), the center of Tropical Storm Hanna was located near latitude 35.2 North, longitude 46.2 West. Hanna is moving toward the east-southeast near 15 mph (24 km/h) and and this motion is forecast to continue over the next day or two followed by a turn to the east-northeast. Maximum sustained winds are near 45 mph (75 km/h) with higher gusts. Small intensity fluctuations are forecast during the next couple of days. Hanna is likely to become a post-tropical cyclone by the latter part of this week. Tropical-storm-force winds extend outward up to 90 miles (150 km) from the center. The estimated minimum central pressure is 1002 mb (29.59 inches).— National Hurricane Center · public advisory 4

Hanna tracks over open water — no coast is in the outlook. Along its path, our forecast reads:

This is the Atlantic · 32°N–40°N, 48°W–32°W. Hanna’s forecast track is the dotted spine — the labelled dots mark its position each day. Every cell is shaded by how many hours it spends inside Hanna’s gale-force (≥34 kt · 39 mph) wind across the whole forecast, the damaging core counted double.

Read it two ways at once. Colour is the total — the hours of gale-force wind a place piles up. A slow storm writes its danger in duration, not in any single gust, so the longer the wind sits over a place, the deeper its colour. Opacity is confidence — solid where the official probability of that wind is high, faint where it is only a chance. So a deep, solid cell is a place the wind will work for a long time and likely will; a pale, faint one is a brief, uncertain brush at the edge of the cone.