Heat: A tale of two airflows

The past few days have offered a couple of perfect examples of how wind direction can have a massive effect on the resulting maximum temperature at this time of year.

Friday, August 12th and Monday, August 15th, were both very similar in that any morning cloud completely cleared by 11am. But while the wind blew from a SW’ly direction on Friday, nudging Wanstead up to a very warm 28.1C, by Monday the high pressure had drifted north, drawing in a cool NE’ly flow off the North Sea. The high temperature in Wanstead on Monday was nearly four degrees cooler at 24.4C.

Under these conditions temperatures will be warmer the further west you go, as the graphs below show.

12082016

Highs to 6pm on 12th were: Wanstead 28.1C with Northolt reaching 27C

fax12082016

15082016

Highs to 6pm on 15th were Northolt at 25C. Gravesend, being furthest east and most influenced by the cooling North Sea breeze reached 22.6C

fax15082016

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