Sunday, April 22, 2012

Day two of the Spring Championships and another blustery day!

Yesterday saw some fairly heavy showers and hail for some and with that some large changes in wind speed and direction- words such as squally, blustery often spring to mind.
Clouds are always a very interesting feature and often a race winning one.

SYNOPTIC SITUATION
Low pressure dominates the area with a strong WNW airflow throughout the day
Initially showers are at the periphery of the country but the airmass is deeply unstable and again expect large clouds and showers to readily develop

Air temperature: 09-11 Celsius

Portsmouth LW 0606   HW 1255

KEY POINTS
- Clouds will become the key feature from 1100 as clouds build over land
- While the wind will initially track left expect these large clouds/showers to provide up to 30 deg wind shifts and increase the wind markedly up to 25-30 KT with a small probability of 35-40 KT where there is hail associated



Time
Wind direction
Wind Speed (KNOTS)
Comments
0900-1100
260-290
10-14 occasional 17
Building breeze with increasing temperatures and cumulus developing overland
1100-1300
260-290 backing 230-260
10-14 building 16-20 occasional 22
Cumulus clouds readily turning to showers and providing squally conditions- wind speeds up to 25-30 KT and directions 300-310
1300-1500
230-260
16-20 occasional 22
1500-1700
230-260 becoming 250-270
16-20 decreasing 12-16
Gradient easing but still risk of squally showers

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