Armagh Observatory, fifth December 2023.
Armagh Observatory studies that November 2023 was barely hotter, sunnier and drier than common. Taking September, October, and November collectively the meteorological autumn at Armagh was a lot wetter, and hotter and sunnier than common.
Complete precipitation was 60.05 mm (2.36 inches) together with 7 hint values, or 59.7 mm if hint values are ignored. That is roughly 81% of the 183-year (1838–2020) long-term common November precipitation at Armagh (73.85 mm) and 73% of the newest (1991– 2020) 30-year common (81.87 mm). The wettest day was the twelfth with 21.6 mm (0.85
inches) of rainfall adopted by the nineteenth with 6.9 mm and the seventeenth with 6.0 mm.
There have been two named storms this month, particularly Storm Ciarán and Storm Debi. Northern Eire was lucky to find itself situated practically centrally between two very deep areas of low stress throughout the first two days of the month, resulting in comparatively quiet circumstances and little or no wind or precipitation related to the violent Storm Ciarán.
This precipitated havoc to northern France and southern Britain because it drove by way of the southern approaches earlier than swinging north and weakening because it moved into the North Sea. Against this, Storm Debi later within the month introduced heavy rain and wind to Armagh on the evening of the twelfth/thirteenth, with winds approaching close to gale pressure on the morning and early afternoon of the thirteenth.
Partial rainbows have been noticed on the afternoons of the third and seventh, and a whole rainbow on the eighth. The 4th was noteworthy in having an unusually low atmospheric stress for November, the bottom at Armagh for 13 years. Astronomers additionally noticed the daylight occultation of Venus by the Moon on the morning of the ninth. An aurora borealis was seen from close to Armagh and throughout the UK and Eire on the evening of the fifth/sixth. Round 6.30pm on the night of the fifth, auroral exercise included the very uncommon short-lived area climate phenomenon generally known as STEVE, that’s, a Sturdy Thermal Emission Velocity Enhancement. The visible look of STEVE, which is usually described as cometary and is sometimes vivid, is poorly understood however is considered produced by a ribbon of high-temperature (a number of thousand levels Celsius), excessive velocity (a number of kilometres per second), low-density, ionised gasoline at nice heights within the Earth’s ambiance. Photographs of this phenomenon, along with a video posted on the web by Mr Davy Patton, could be discovered on the web.
The imply temperature this November was 7.5 levels Celsius (45.5 Fahrenheit), practically 1.3 C hotter than the 225-year (1796–2020) long-term common November temperature at Armagh (6.22 C) and 0.2 C hotter than the newest (1991–2020) 30-year common (7.33 C). It’s attention-grabbing to notice that once we take into account the distinction between the (1961–
1990) 30-year common at Armagh and the newest (1991–2020) interval November exhibits the best warming, roughly 1.2 C in thirty years or 0.4 C per decade. Such a change is noticeable even with no thermometer. For instance, leaves at the moment are remaining on timber till fairly late in November, and lawns nonetheless should be reduce proper as much as the top of the month and generally into early December. Such phenomena would have been nearly unparalleled 30 years in the past.
The best most temperature or warmest day was 14.8 C on the afternoon of the 18th adopted by 13.1 C, which occurred on the afternoons of the twenty second and twenty third. The climate grew to become a lot cooler in the direction of the top of the month, resulting in the good day or lowest most air temperature being 3.4 C on the twenty ninth adopted by 6.0 C on the thirtieth. The warmest evening or highest minimal air temperature was 11.1 C, conventionally attributed to the twenty third, adopted by 10.3 C within the early hours of the nineteenth. The best evening or lowest minimal air temperature was -1.8 C on the thirtieth adopted by -1.6 C on the twenty ninth. There have been 16 nights with floor frost, the coldest three of which occurred on the thirtieth (- 8.8 C), the twenty fifth (-7.7 C) and the twenty ninth (-7.6 C). Not like November 2022 when there have been no nights with air frost, this November recorded three nights when the air temperature fell under freezing, particularly the thirtieth (-1.8 C), the twenty ninth (-1.6 C), and the twenty fifth (-1.5 C). There have been 82.6 hours of sturdy sunshine this November, roughly 39% greater than the 140-year (1881–2020) long-term common November sunshine at Armagh (59.5 hours) and practically 34% greater than the newest (1991–2020) 30-year common (61.6 hours).
This was the ninth sunniest November on file at Armagh. The sunniest day was the fifteenth with 7.0 hours of sturdy sunshine adopted by the tenth with 6.5 hours and the fifth and thirtieth with 6.0 hours. Taking the three autumn months September, October and November collectively, September was the third warmest September on file at Armagh and wetter and sunnier than common, and October was the wettest October on file and really delicate and sunnier than common. Consequently, the meteorological autumn at Armagh was a lot wetter than common, and each hotter and sunnier than common. Complete autumn precipitation was 347.2 mm, roughly 56% greater than the 140-year (1838–2020) long-term common at Armagh (223.2 mm) and 52% than the newest (1991–2020) 30-year common (227.9 mm). Autumn 2023 is now the fourth wettest autumn on file at Armagh. The imply autumn temperature was nearly 11.5 C, roughly 2.0 C hotter than the 225-year (1796–2020) long-term common autumn temperature at Armagh (9.41 C) and 1.1 C hotter than the newest (1991–2020) 30-year common (10.40 C). This being the fifth warmest autumn on file at Armagh, all the highest seven warmest autumns at Armagh have occurred within the 2000s. There have been 304.3 hours of sturdy sunshine this autumn, practically 18% greater than the 140-year (1881–2020) long-term common at Armagh (259.0 hours) and 14% greater than the newest (1991–2020) 30-year common (61.6 hours).
These knowledge confer with observations at Armagh Observatory, which has been recording the climate at Armagh since 1795.
FOR FURTHER INFORMATION PLEASE CONTACT:
Mark Bailey on the Armagh Observatory, Faculty Hill, Armagh, BT61 9DG.
Tel.: 028-3752-2928
mark.bailey@armagh.ac.uk;
