High Keywan set for a long stay

Courtesy of wxcharts.com

It looks like high Keywan, as the BIM have named it, will stick around in the central Atlantic right out till day ten if this ECMWF hi-res forecast proves correct. It’s forecast to be as intense as 1053 hPa as it moves northwest by the weekend, before slowly declining to around 1032 hPa as it drifts southwest during next week. That means that the flow will be generally be more NW’ly rather than northerly, and allow depressions to run southeast from Iceland towards the northern North Sea, and as winds veer to more northerly in their wake, drag another pulse of cold air down across the country. Basically this is Lamb’s ANW type and not that unusual during spring.

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