TORRO CONVECTIVE OUTLOOK issued on Friday July 9 2010. A broad upper trough to the west of the British Isles will sharpen as it approaches during the next 36-48 hours. A frontal wave will develop in response to this, and deepen into a surface depression, which is then progged to track NNE through western Eire and into western Scotland through Saturday. Close to the track of the depression, weak instability is expected to develop in a fairly strongly sheared environment. Cloud will be rather extensive but any breaks will allow somewhat larger instability to develop locally across Eire and N Ireland. An extensive area of rainfall will accompany the frontal system across Eire, N Ireland and Scotland, although a few embedded thunderstorms are expected too. The highest risk of severe weather appears to be across Eire/N Ireland, where isolated tornadoes and damaging wind is possible. A lower risk for Scotland, N Wales and N England, but this could increase through the evening. The extensive cloudiness associated with the warm sector (tropical maritime origin) along fairly neutral lapse rates currently indicate the overall risk is fairly low. However, the situation will be monitored tomorrow, and if cloud breaks more than currently expected in the warm sector, the overall risk would likely be somewhat higher. Forecaster: RPK.TORRO