Lake Predil (961m a.s.l.); Julian Alps, FVG, Italy
22-February-2021: maximum temperature: +10°C.
The early thaw 2021 (more than a month before, compared to the NORMAL climatic averages of the area), due to meteorological causes and coincidences, therefore it is a temporary situation, a thaw that will be interrupted several times, is given by an anomalous persistence of an African High Pressure "Bell", as already mentioned, with Geopotentials and HIGH ALTITUDE temperatures since the beginning of June (almost 2 seasons earlier).
The cold winter air that resists at an inertial level in the valleys orographically suitable for the protection of these residual masses, is also put to the test by the Sun, which (here we are at the 46th parallel north), in the last decade of February, is high on the horizon as in mid-October!
The northern slopes of the more massive reliefs keep the abundant winter snowcover almost intact, thanks to snow own albedo, which has average temperatures around -6°C (snow temperature).
It should be added that in TEMPERATE latitudes Mountain areas, frost and thaw do not respect fixed dates, they are the average of meteorological trend extremes: there were even winters without snow and without persistent frost in the alpine valleys of this area, therefore without a real thaw, and winters that lasted much longer than average, starting a noticeable thaw just in late April.
Furthermore, SINGLE mild and springly days are also possible in January, as well as winter returns (progressively shorter) are possible until May; flowers and plants have often suffered harmful frosts resulting from a ("false") thaw that started too early.
Lake Predil (961m a.s.l.); Julian Alps, FVG, Italy
22-February-2021: maximum temperature: +10°C.
The early thaw 2021 (more than a month before, compared to the NORMAL climatic averages of the area), due to meteorological causes and coincidences, therefore it is a temporary situation, a thaw that will be interrupted several times, is given by an anomalous persistence of an African High Pressure "Bell", as already mentioned, with Geopotentials and HIGH ALTITUDE temperatures since the beginning of June (almost 2 seasons earlier).
The cold winter air that resists at an inertial level in the valleys orographically suitable for the protection of these residual masses, is also put to the test by the Sun, which (here we are at the 46th parallel north), in the last decade of February, is high on the horizon as in mid-October!
The northern slopes of the more massive reliefs keep the abundant winter snowcover almost intact, thanks to snow own albedo, which has average temperatures around -6°C (snow temperature).
It should be added that in TEMPERATE latitudes Mountain areas, frost and thaw do not respect fixed dates, they are the average of meteorological trend extremes: there were even winters without snow and without persistent frost in the alpine valleys of this area, therefore without a real thaw, and winters that lasted much longer than average, starting a noticeable thaw just in late April.
Furthermore, SINGLE mild and springly days are also possible in January, as well as winter returns (progressively shorter) are possible until May; flowers and plants have often suffered harmful frosts resulting from a ("false") thaw that started too early.