Rapid cyclogenesis in action!

Figure 1

Low Carola is deepening very quickly at the moment, and the curl of cloud she is spinning up makes an impressive site in the latest satellite imagery to the southwest of Ireland (fig 1), as do the plotted observations and barograph from the weather buoy 62029 better known as ‘K1’ (figs 2 & 3).

Figure 2

As far as I can see Carola easily breaks the barrier for rapid cyclogenesis of 24 hPa in 24 hours, the pressure there has fallen by 37.4 hPa in 12 hours, in fact I don’t think I have ever seen sustained pressure falls like that on a chart from an extra tropical low.

Figure 3

No doubt the French will have claimed this low and come up with their own name for it, but I noticed it didn’t even get a mention in the BBC forecast at 12.58 pm from Sarah Keith-Lucas.

Spain’s snow-covered mountains

Figure 1 – Courtesy of NASA

Rather more geographical than meteorological I know, but I think I’ve identified these four snow-covered mountain ranges in Spain which are standing out so well on today’s satellite picture (fig 1). I reckon that after a bit of research they are:

  1. The large striking Montes de León range of which the highest peak is Teleno at 2,188 M.
  2. The isolated Peña Canchera at 1,592 M is the highest point in the Sierra de Gata range.
  3. The Sierra de Gredos range peaking out from some cloud of which the highest point is Pico Almanzor at 2,592 M.
  4. The snow-covered mountains close to the south coast are of course the Sierra Nevada’s or ‘snowy mountains’ in Spanish, which for some reason I had always believed lay further west. The highest point is Mulhacén at 3,478 metres which is also the highest point of continental Spain.

– Here endeth the geography lesson – 

21 March 2018 – Interesting satellite image

Figure 1 – Courtesy of NOAA

An interesting satellite picture day of clouds across the bay of Biscay from the NOAA Worldview website (fig 1). If anything, the grey scale image from the Met Office taken a little later looks even better (fig 2). As far as I can tell it all looks like a sheet of low stratocumulus cloud at under the anticyclone, with a cloud base of around 4,000 feet, but I could be wrong.

Figure 2 – Courtesy of EUMETSAT and the Met Office

Cirrus spissatus over the Maldives

Figure 1

I got fed up with programming in JavaScript and HTML, so I thought I’d take a look at the world using Worldview from NASA and see what I could see. Beautiful cirrus plumes across the Indian Ocean (fig 1).

Figure 2

Strange goings on in the Sahara desert south of Cairo (fig 2).

Figure 3

What looks like medium level altocumulus, but’s probably a much lower sheet of stratocumulus to the north of the Canary Islands (fig 3).

 

A spot of déjà vu in the southwest this morning

A very similar sunny start to the day in the southwest of England (fig 1) when compared to yesterday (fig 2), with another curl of cloud over eastern districts.

Figure 1
Figure 2

It’s certainly cyclonic and very changeable at the moment, and still cold enough to produce snow further north especially over higher ground (fig 3).

Figure 3

March has certainly come in like a lion this year, and Monday looks like it could end up being quite stormy across southern areas if this GFS forecast comes off (fig 4).

Figure 4

5 February 2018 – wind chill at 10 UTC

Figure 1

Lovely morning down here in the southwest, but the wind is adding a bit of a bite to it even so, with a-5.6°C wind chill at nearby Dunkeswell at 10 UTC (fig 1). The SC sheet that’s lying across northern England and Wales seems to be aligned with the lighter winds down the axis of the ridge (fig 2).

Figure 2

There’s talk of a SSW event later in the month, which may explain why the GFS model has been in a total quandary for a while now, with little consistency from run to run beyond T+120.

Scotland under snow

Figure 1 – Courtesy of NASA WorldView

Classic picture of the snow over Scotland earlier today thanks to this NASA visible satellite image from earlier today (fig 1). Most of the country is under snow, and over higher ground that’s now a very deep cover, it’s not that often that the Isle of Lewis gets a complete cover of at least 8 cm like it has, but rather strangely most of Aberdeenshire is snow free. There are Cumulonimbus clouds and associated snow showers pushing south across the northern Isles, and some broken frontal cloud across the southwest.

Temperatures at many places across the north have stayed sub-zero today, and at Altnaharra at 15 UTC it’s -5.6°C. The 35 cm snow depth at Tulloch Bridge is slightly less than it was yesterday, this due to consolidation rather than any thawing (fig 2).

Figure 2