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January is odd sometimes. Yesterday south-westerlies of all things brought temperatures below freezing as a result of the then low air temps over the North Sea. Today, the wind direction is from farther north, coming in from Norway and somehow it's still milder - about 2-3°C in spite of being way too early for the sun to be able to bring temps above freezing through sun strength alone. Most often sun = -2°C or colder this time of the year, but not today. Rather reversed patterns compared to normal.
do you get wind with the temperature shift? Our temperatures dropped 10-15°F in the last few days, strong wind with the shift
do you get wind with the temperature shift? Our temperatures dropped 10-15°F in the last few days, strong wind with the shift
Not really, it's just weak direction changes and low wind these last few days and probably that does explain why the thermal effects on the wind direction have been so offset from the normal patterns. With strong winds, Azorean air would be pushed north-eastward rather than the cold air over England, hence south-westerlies are often much warmer when the wind direction is strong. Usually the first double-digit day of spring for example is a south-westerly originating from the Azorean High. That leads to 12°C March weather with gusts of 12-15 metres/second.
With strong north-westerlies on the other hand, today would've been below freezing. The air doesn't move fast enough, so the maritime influence of the ice-free seas of both sides of Sweden are more than capable of keeping temps around 0°C when they're not overwhelmed by continental gusts or the Atlantic strong winds. Usually when "Scotland" arrives here though, the low-pressure off Ireland is rather intense and water temperatures are high. That's when 3-5°C rain occurs. Today's 2°C sun is rather abnormal conditions for January. So both south-westerlies (Azores) and straight westerlies (Scotland/Ireland) can bring temps above freezing, but they have vastly different effects.
Looks like a late January potentially severe cold spell is indeed on the cards for UK then, in the wake of the Stratospheric Warming earlier in the month. Some interesting discussion taking place on netweather.tv.
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