© Frank Le Blancq

Portelet, St Brelade, Jersey

Latitude: 49° 10' 23'' N

Longitude: 2° 10' 24'' W

11 January 2012 0910 (Local Time)
Camera direction: towards SW

Image P/S code: P.7.7

Image I.D.: 4714

C_L = 5, C_M = /, C_H = /

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  Stratocumulus stratiformis translucidus undulatus

  This extensive layer of rolls of grey and whitish cloud is typical of Stratocumulus stratiformis. The cloud is not very thick, with areas of blue sky visible through the layer, and the merged elements are arranged in nearly parallel lines; these features identify the varieties translucidus and undulatus. A nearby synoptic station reported a cloud base of 4 000 ft with an estimated cloud top of 5 500 ft from a representative sounding.

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  © Frank Le Blancq
  Portelet, St Brelade, Jersey
  Latitude: 49° 10' 23'' N
  Longitude: 2° 10' 24'' W
  11 January 2012 0910 (Local Time)
  
  
  Camera direction: towards SW
  C_L = 5, C_M = /, C_H = /
  Image P/S code: P.7.7
  Image I.D.: 4714
• 

  The area was dominated by an anticyclone which extended from eastern Europe across northern France to the East Atlantic, with one centre over Germany and another (1 037 hPa) over Brittany, France, close to the photo location. The nearest active fronts and lows were far to the north.

  © Deutscher Wetterdienst
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  The Brest, France (WMO 07110) sounding at 0000 UTC, taken in the same air mass, shows a gradual moistening of the air, especially from 900 hPa to 843 hPa. The moist layer is capped by a strong inversion of nearly 8 °C between 843 hPa (96 %RH) and 830 hPa (18 %RH), which is typical of a strong anticyclone as dry warming air from aloft descends to lower levels.

  © University of Wyoming