Saturday, 19 September, 2020
Forecasts for Ireland
TRENDS for the week of 19 to 25 September 2020
-- Temperatures will be near normal values, with a downward trend reaching 2-3 below normal near end.
-- Rainfall will be 50 to 75 per cent of normal values.
-- Sunshine will be near average for this time of year.
TODAY will see some cloud, mostly of higher types, spreading across the south, but some sunshine will continue to break through. The moderate east winds will cool off the eastern counties to around 15 C, while further west highs of 19 or 20 C are likely.
TONIGHT will be partly cloudy with some fog patches forming and cool, with lows 3 to 7 C.
SUNDAY will be partly cloudy again once any persistent fog dissipates, with somewhat less cooling from easterly breezes as they drop off to lighter values, highs still in the 15 to 20 C range.
MONDAY will be partly cloudy to overcast with increasing lower cloud decks expected across parts of the north, leading to rain late in the day there. Lows 3 to 7 C and highs 15 to 20 C.
TUESDAY will become quite breezy and considerably cooler with intervals of light rain followed by partial clearing, winds westerly 40 to 70 km/hr, lows near 8 C and highs near 14 C.
The outlook for mid-week and towards the following weekend is generally rather cool and occasionally wet as Atlantic frontal systems return. Highs will be in the 12 to 16 C range and nights sometimes close to frost levels.
There is still some uncertainty in the longer term forecast due to Teddy, which is still most likely to head north from near Bermuda this weekend into some part of eastern Canada then on towards Greenland as a remnant low. The current guidance does not show much left of Teddy's circulation by the time it gets past the middle of the Atlantic but that could conceivably change if the track is only a glancing blow of Newfoundland and not as earlier thought a longer run into the Canadian provinces of Nova Scotia and Newfoundland-Labrador.
The tropical action was fast and furious, with the Atlantic storm I mentioned getting the name Wilfred (it is not predicted to have much of a future), then a regular Atlantic low near Portugal briefly acquiring enough subtropical storm characteristics to snag the name Alpha, so that the Gulf of Mexico storm now has the name Beta. As happened in 2005, Beta shows signs of becoming a hurricane (Alpha peaked at 50 knots and dissipated overnight in the Iberian peninsula). This year's Beta is a month earlier than 2005 Alpha (the 23rd named storm of each season) but as I mentioned, this is no guarantee of outdoing 2005 by end of play, although clearly there is no hesitation in naming just about anything this year.