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Post-tropical Cyclone Katia (12L) Expected to Bring Strong Winds to British Isles

47.0N 58.7W

September 10th, 2011 Category: Tropical Storms

Post-Tropical Cyclone Katia (12L) - September 9th, 2011

Track of TS 12L  - September 10th, 2011 © Univ. of Wisconsin

Track of TS 12L

Katia loses tropical characteristics over the far North Atlantic expected to bring strong winds to the British Isles as a powerful post-tropical cyclone on Monday.

At 11:00 AM AST (1500 UTC) the center of Post-tropical Cyclone Katia (12L) was located near latitude 44.7 north, longitude 47.7 west. The system is partially visible near the USA and Canada on the right side of the main image; the animated imagery offers a complete view of the storm and its recent movement.

Katia is racing toward the east-northeast near 53 mph (85 km/h) and this general motion is expected to continue for the next couple of days. On the forecast track, this system is expected to pass over or near the northern British Isles on Monday.

Maximum sustained winds are near 80 mph (130 km/h) with higher gusts. Katia is expected to remain a strong extratropical cyclone over the next 48 hours.

Hurricane-force winds extend outward up to 80 miles (130 km) from the center and tropical-storm-force winds extend outward up to 310 miles (500 km). Estimated minimum central pressure is 954 mb (28.17 inches).

Hazards affecting land include wind, surf and rainfall. Gale- to storm-force winds are expected to affect much of the British Isles on Monday, and could cause damage to trees and
disrupt transportation and other public services. Large swells generated by Katia will continue to affect US New England areas, Altantic Canada and Bermuda today, and spread eastward into the British Isles Sunday and Monday. These swells are likely to cause life-threatening surf and rip current conditions. Total rain accumulations of 50 to 100 millimeters (2 to 4 inches) are expected over the western mountains of Scotland.

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