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Week's Forecast

Teesdale weekly forecast, issued Sunday 13th August, valid Wednesday 16th to Sunday 20th August, next update by Sunday 20th.Another unsettled week.The jetstream remains strong this week channelling Atlantic depressions towards the UK. Once again it will be virtually overhead Teesdale bringing no let up to this unsettled, cool and showery summer. Shade temperatures are unlikely to top 20°C again and there will be showers or longer spells of rain. Between the rain bands expect some sunshine, especially in the lower dale as the westerly winds will favour us in the shelter of the high Pennines.This week's overall prediction for mid-Teesdale:- high 19°C (66°F), low 7°C (45°F) precipitation 25mm (1.0in), sunshine 40hr, high gust 30mph. Risks:- flooding medium, gale medium, ground frost medium.Tropical storms over the eastern seaboard of the USA have introduced humid, moist air into the high atmosphere and this will pep up the rainfall at times with some isolated thundery conditions and strong winds embedded within the low pressure systems. This is making forecasting difficult at the moment as will be seen for those using mobile phone apps. The computers struggle in these setups and input from meteorologists is needed to fine tune the forecasts.Last week's weather:- Screen temperature 11.7°C (normally 14.3°C) High 19°C(66°F) Thursday. Low 4°C (39°F) Sunday 13th. Windiest 36mph Friday. Precipitation 23mm (norm 16mm). Sunshine 37hr (norm 32hr).Many years ago it was noted that unsettled weather patterns around St Swithin’s Day (15th July) often tended to continue for many weeks. In fact the well-known saying suggests little change for 40 days and nights which would bring us nicely to St Bartholomew’s Day on 24th August. Thereafter a resurgence of summer can be expected. It is interesting how often this seems to happen especially in Teesdale where autumn can be the best season of the year. Ken Cook’s 12 hourly Teesdale forecasts, http:// www.kencook.magix.net



COPLEY CLIMATOLOGICAL STATION altitude 253metres(830feet) Met. Office manned observing site.