Sunday, April 29, 2012

Final Spring Series Racing - post Ark-like weather



 SYNOPTIC SITUATION
The UK has been affected by some fairly stormy conditions this week and this morning starts off as no exception
A low pressure sits n the English channel and unusually so will track WNW maintaining severe gale force NE that will back and moderate by 1100 to near gale force airflow.
The airmass is currently extremely stable and there form despite the strong airflow the surface wind conditions are lower than you might expect- but the maximum gust is still high

Air temperature 13-15 Celsius

Weather: Overcast with moderate rain and drizzle until 1300-1400 then scattered cloud

Portsmouth:   HW 0450    LW 1029




KEY POINTS
- big mean to gust ratio- so will be squally- www.bramblemet.co.uk
- rain and drizzle easing  0900-0930- cloud lifting but not breaking indicating veer to east
- cloud breaking and clearing 1330-1400 further veer to the SE
-Gusty to begin with- with long period shifts
- shift period decreasing with clearing skies and further increasing wind


Time
Wind direction
Wind speed (KT)
MAX
Comments
0900-1100
030-060 veering 070-090
25-30 decreasing 16-21
35-40
Warm front clears through 0930-1000 wind veers and decreases
1100-1300
070-090
16-21, occasionally 12
30
Still overcast with isolated rain and drizzle
1300-1500
070-090 becoming 130-150
16-21 increasing 20-25
30
Cloud clearing increasing instability- wind building
1500-1700
130-150
20-25
30
Little change

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