Find out what the lines, arrows and letters mean on synoptic weather charts. The word 'synoptic' simply means a summary of the current situation. In weather terms, this means the pressure pattern, fronts, wind direction and speed and how they will change and evolve over the coming few days. Temperature, pressure and winds are all in balance and the atmosphere is constantly changing to preserve this balance. This is why the UK sees such changeable weather. Pressure pattern The circular lines you see on the chart are isobars, which join areas of the same barometric pressure. The pressure pattern is important because we can use it to tell us where the wind is coming from and how strong it is. It also shows areas of high and low pressure. Air moves from high to low pressure along a gradient (similar to squash that is left in a glass of water becoming evenly distributed as it becomes less concentrated). If the difference between areas of high and low pressure is greater then we have a large gradient and the air will move faster to try and balance out this difference.
Forecast Wednesday 0% 82 ° 82 ° Night - Breezy. Winds E at 18 to 22 mph (29. 0 to 35. 4 kph). The overnight low will be 82 °F (27. 8 °C). Breezy with a high of 82 °F (27. Winds variable at 16 to 19 mph (25. 7 to 30. 6 kph). Thursday 0% 82 ° 82 ° Breezy today with a high of 82 °F (27. 8 °C) and a low of 82 °F (27. Friday 0% 83 ° 82 ° Breezy today with a high of 83 °F (28. 3 °C) and a low of 82 °F (27. Saturday 0% 83 ° 82 ° Breezy today with a high of 83 °F (28. Sunday 5% 83 ° 82 ° Thunderstorms today with a high of 83 °F (28. Monday 0% 83 ° 82 ° Breezy today with a high of 83 °F (28. Tuesday 0% 83 ° 82 ° Windy today with a high of 83 °F (28. Wednesday 0% 83 ° 82 ° Windy today with a high of 83 °F (28. Thursday 0% 83 ° 81 ° Windy today with a high of 83 °F (28. 3 °C) and a low of 81 °F (27. 2 °C). Friday 0% 83 ° 82 ° Windy today with a high of 83 °F (28. Precipitation Night Overnight Early Morning Morning 0% 0% 0% 0% Wind & Pressure Details Feels like 91° Humidity 83% Visibility 10. 00 miles UV Index 0 (Low) Tonight - Breezy.