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Weather Weather An Overview for Walkers What is Weather? Weather weath·er n. The state of the atmosphere at a given time and place, with respect to variables such as temperature, moisture, wind velocity, and barometric pressure Where do we find out about it? Weather •Met Office (Website, Telephone- VERY good for mountain areasnow accessible via www.stmarysdofe.co.uk !) •BBC Website (www.bbc.co.uk/weather - includes postcode search) •TV, Radio, Newspapers •Tourist Information Centres •Mountain Rescue Centres •Look! Air Masses Weather Weather Fronts Weather Cold Front. Cold air replaces warm air. Where warm air is pushed up and rises over cold air, it is forced to cool and condense. This produces rain. Warm Front. Warm air replaces cold air- Good weather! Precipitation Weather Weather Wind All of This Wind… Weather Squeezes Through this Gap! Cloud Types Weather Cirrus Clouds •Thin and circular •High in the sky •Left over after a thunder storm, come from aeroplanes or mark the sign of the start of an approaching weather system (= disturbance) •In themselves: no precipitation Note: Cumulus clouds are fluffy Stratus clouds are long Nimbus means rain Cloud Types Weather Alto Clouds •In the middle of the sky •Wavy and rounded •Mark end of a cold front •If you see them early in the morning on a warm day it often means that there’ll be a thunder storm later in the day Cloud Types Weather Stratus Clouds •Thick layers of cloud (stratus is Latin for blanket) •Low in the sky •Reduce visibility •Often bring drizzle but not heavy rain Cloud Types Weather Cumulo Nimbus Clouds •Thick and fluffy •Often grey / black •Cause severe weather •Mostly cause rain! Likely expedition weather Weather •Rain (constant…) •Showery and Overcast •Sunny with Showers •Sunny and Hot •Windy •If you’re lucky… Sun with occasional cloud cover and a light cooling breeze Weather when you’re walking •Clothing- Hot and Cold •Health- Hot and Cold •Morale •Dropping out Weather Weather and the expedition •Extreme Weather •Camping •Bad Weather Route Weather Weather Weather Questions? Weather