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Alps Weather Blog 30th March 2013

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[b]Alps Overview[/b]


Some fresh snow over the past week, have once gain improved snow conditions, as we now coming to the latter part of the season, spring snow is becoming an issue into the afternoon with slushy conditions on lower slops later in the day.

[b]Synoptic Summary[/b]

Breaking with tradition I’ll start this week with where we were at the time of the last blog, on Saturday (23[sup]rd[/sup] March)

Extensive Northern Blocking pattern at the moment with a Greenland High at 1056mb, with 1040mb right the way through to Norway, feeding bitter air over Eastern Scandinavia and into Eastern Europe. And westwards over parts of Northern Britain, this general pattern never really changes with the colder air covering all of the UK from around Monday to Friday.

Today also sees a low pressure system centred to the South West of the UK, which has caused very heavy snowfall over Central parts of the UK and heavy rainfall for more southern areas (where it has been milder with SW winds). South Easterly winds are in place for the Alps, which never seems to tap into the coldest air this week, and with the coldest air the further north and East you go. However there is generally low pressure, which is the reason for the showers, which tend to develop more especially into the afternoon.

The general theme of the weather has not really moved away that much from last week,
Currently there is low pressure to the West and South West of the UK (964mb) over the Atlantic, High Pressure over Greenland (1032mb) with low pressure over Svalbard and N Scandinavia, with High Pressure over Russia, with the UK and much of mainland Europe with low pressure in between but generally cool/cold Easterly winds. This has kept the very cold for the time of year conditions for the past number of weeks, the Alps has seen close to average temps, never quite seeing the coldest air, but the mildest weather to the far SW of Europe also being kept in bay.

[attachment=167262:29 Mar ACT.JPG]

As has been the case over the past few weeks any changers to the weather pattern are slow. Remaining on the cold side with a ridge developing over the UK (1016mb) but this seems enough to keep low pressure away to the SW, at the moment the Atlantic Jet seems very weak. For the Alps, A NE feed on the SE flank of the HP ridge, and colder winds associated with low pressure over Italy, cold being some snowy weather here.

[attachment=167258:30 Mar.JPG]

[size=4]By Monday, again not that much change with the ridge now over northern parts of the UK, with low pressure remaining to the west of the UK, as it seems to set to do all week. A cool E/SE flow is expected over more southern parts, of the UK and a cool
Easterly flow over the Alps, with the coldest air always for the Northern Alps this week. [/size]

[size=4][attachment=167259:1 Apr.JPG]

By midweek the ridge builds more into Southern Scandinavia with an easterly feed with an easterly feed re-establishing itself over the UK and the Alps,
[attachment=167260:3 Apr.JPG]

The general pattern remains until the weekend with the high pressure further west again with a NE flow over the UK and the Alps.[/size]

[size=4][attachment=167261:5 Apr.JPG]

[b]Alps Detail [/b][/size]

[size=4][b][font=Calibri","sans-serif]Sat 30 March[/font][/b][/size]
[size=4][font=Calibri","sans-serif]Early Precipitation over northern parts of the Alps, tending to fade as more general precipitation pushes up from the south. By early evening , this covering the French Alps, Switzerland, Southern Germany and most of Austria, however the heaviest of any precipitation for Italy and associated border parts of France, Italy and Switzerland. This continuing into the early hours and concentrating more over Austria, and Eastern Germany and Italy. [/font]

Freezing Level (3pm) Southern Germany 1200m-1400m, French Alps 1400-1800m, Switzerland 1400-2100m (NW to SE), Italian Alps 1600m-2000m, Austria 900m-2000m (NE to SW)[/size]

[size=4][attachment=167268:30 Mar Alps.JPG][/size]

[size=4][b][font=Calibri","sans-serif]Sun 31 March[/font][/b][/size]
[size=4][font=Calibri","sans-serif]Moderate or heavy precipitation over eastern parts of the Alps for the morning, drier over France and Switzerland and over Western parts of Germany and Italy. Slowly through the day precipitation amounts fading but still moderate in eastern area during the afternoon. As temps fall, much of the precipitation will fall as snow. [/font]

Freezing Level (3pm) Southern Germany 600m-800m, French Alps 1000-1600m (NW to SE), Switzerland 700-1600m (N to S), Italian Alps 1400m-1600m (E to W), Austria 400m-1200m (NE to SW)..[/size]

[size=4][attachment=167269:31 Mar Alps.JPG][/size]

[size=4][size=4][b][font=Calibri","sans-serif]Mon 1 April [/font][/b][/size][/size]

[size=4][font=Calibri","sans-serif]A very cold morning, with freezing levels down to sea level for many Central and Northern Alpine areas. Drier than over the weekend, with only a few showers developing into the afternoon. [/font]

Freezing Level (3pm) – a bit milder than Sunday for S and more especially SW areas- Southern Germany 700-1000m (E to W), French Alps 1800-2000m (NW to SE), Switzerland 800-2000m (N to SW), Italian Alps 1400-2000m (E to W), Austria 400m-1600m (NE to SW).[/size]

[size=4][attachment=167267:1 Apr Alps.JPG][/size]

[b][size=4][font=Calibri","sans-serif]Tue 2 April[/font][/size][/b]

[size=4][font=Calibri","sans-serif]Dry again to start, but precipitation developing over Italy pushing North and some moderate showers are possible during the afternoon for France, Switzerland and especially Austria and Italy. [/font]

Freezing Level (3pm) – a bit milder again - Southern Germany 1000-1200m (E to W), French Alps 1800-2000m (NW to SE), Switzerland 1200-2000m (N to S), Italian Alps 1800-2000m (E to W), Austria 900m-1900m (NE to SW).

[attachment=167266:2 Apr Alps.JPG][/size]

[size=4][b][font=Calibri","sans-serif]Wed 3 April[/font][/b] [/size]
[size=4]A west east split on terms of precipitation on Wednesday largely dry in the west, although the odd showers cannot be ruled out, however further east, more general precipitation, falling as snow to at least mid slopes level.

Freezing Level (3pm) Southern Germany 1000-1200m (N to S), French Alps 1600-2000m (NW to SE), Switzerland 1100-2000m (NW to SE), Italian Alps 1800-2000m, Austria 600m-1600m (NE to SW).[/size]

[size=4][attachment=167265:3 Apr Alps.JPG][/size]

[size=4][b][font=Calibri","sans-serif]4 April[/font][/b] [b][font=Calibri","sans-serif]and 5 April[/font][/b][/size]
[size=4][font=Calibri","sans-serif]Perhaps more in the way of general precipitation in the Far East of Austria to start Thursday, but apart from this mostly dry early and late, but with showers developing in the afternoon generally. [/font][/size]
[size=4]At this stage, tuning unsettled from the South West, with some heavy precipitation edging in for Western areas on the Thursday and this moving into the east for the Friday, but a lot of uncertainty this far out.[/size]
[size=4]Freezing levels tending to rise on both Thursday and Friday. [/size]
[size=4]Friday Freezing Level (3pm) - Southern Germany 1000-1800m (E to W), French Alps 2000-2200m (NW to SE), Switzerland 1800-2200m (N to S), Italian Alps 1800-2200m (E to W), Austria 800m-2200m (NE to SW)[/size]

[size=4][attachment=167264:4 Apr Alps.JPG]

[attachment=167263:5 Apr Alps.JPG][/size]


The general pattern this week seems set, winds from a general easterly direction, moderate precipitation over the weekend, showers thereafter, more especially into the afternoon, and always coldest the further North and North East east you go. However the exact wind flow could make a big difference in terms of on the ground temps.
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