The synoptics look like average summer warm spell so very interesting to see a record broken in N Ireland . Perhaps worrying also.
Just a little background into the new NI temperature record.
The station at Ballywatticock is close to the town of Newtownards in North Down.
Interestingly, the 30.8C (which was the old record recorded in west Fermanagh on 30th June 1976 and at Shaws Bridge (south Belfast) on 12th July 1983) was also equalled at Killowen (Southeast Down) on Saturday afternoon.
It has been extremely dry across Northern Ireland over the last 6 weeks. Just 52% of normal in June and 20% of average so far in July. The ground is baked rock hard and many lawns / grassed areas have turned brown. This will have allowed temperatures to rise a couple of degrees above what normal low level thickness forecasts would suggest.
There has been marked subsidence warming under high pressure for several days now across Northern Ireland and by today, low level thicknesses had exceeded 139 Dam….very high for this part of the world.
Friday saw temperatures widely reach 26-28C across Northern Ireland.
Saturday had a gin clear sky with not even a whisp of cirrus and a light westnorthwesterly drift giving the east and southeast of NI the benefit of the longest land track for the air. Sun elevation was just two degrees off maximum -being less than 4 weeks since solstice.
The Met Office UKV model from midnight last night was forecasting max’s around 31C in east/southeast Down having eventually caught up with how warm the low level air was.
Having had sight of the station temperature traces it would appear that the absolute max’s occurred when winds dropped out flat calm just before a sea breeze kicked in at both sites which led to a significant drop in temperatures.
So it would appear all the factors came together to allow a new extreme high max for NI.
Admittedly of course we didn’t have a huge value to beat in comparison to other parts of GB or indeed ROI so the fact that we’ve taken so long to beat the previous record is perhaps the surprise.
Suffice to say unless the station inspection reveals something unacceptable (which I’d be surprised at given that the site is visited and maintained regularly)…I would expect this value to be confirmed in due course.
Hope this is useful.
John.
The orange County of Armagh.