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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