Jet Stream map - UK weather forecasts
Apr 15, 2013 10:22:23 GMT
Etienne Le Croq and goldfish like this
Post by Firefox on Apr 15, 2013 10:22:23 GMT
I came across this the other day:
www.netweather.tv/index.cgi?action=jetstream;sess=
It's all about the Jet Stream and the influence it has on UK weather. It can be played forward to predict the weather. Here's a Jet Stream tutorial.
www.netweather.tv/index.cgi?action=jetstream-tutorial;sess=
www.netweather.tv/index.cgi?action=jetstream;sess=
It's all about the Jet Stream and the influence it has on UK weather. It can be played forward to predict the weather. Here's a Jet Stream tutorial.
www.netweather.tv/index.cgi?action=jetstream-tutorial;sess=
Zonality and Meridional flow.
During periods when the jet stream is flat and strong with little amplification or meandering, the UK is likely to experience weather that is driven straight in from the Atlantic. This is characterized by wet and windy weather with temperatures near to average. This condition is often termed zonality as the warm and cold air masses are clearly defined by a straight fast flowing jet.
During periods when the jet stream is amplified the pattern will be different. This is often termed meridional with polar air travelling further south than usual and warmer sub tropical air travelling further north. The exact positioning of the amplification of the jet stream will determine whether or not the UK is in cold polar air or warmer air from lower latitudes. If a meridional pattern becomes stagnant then the UK may experience either of these conditions for a period of time and the pattern may be known as blocked.
Summary of the Jet Stream and the weather it creates:
The position of the jet stream over the UK determines the type of weather we experience.
If the polar front jet is situated significantly to the south of the UK we will experience colder than average weather.
If the polar front jet is situated to the north of the UK we will experience warmer than average weather.
If the polar front jet is situated over the UK we will experience wetter and windier than average weather.
If the polar front jet has a large amplification then cold air will travel further south than average and warm air will travel further north than average.
The direction and angle of the jet stream arriving at the UK will determine what source of air (i.e. cold, dry, warm, wet, from maritime or continental sources) the UK experiences.
(c) Ed O'Toole www.netweather.tv
During periods when the jet stream is flat and strong with little amplification or meandering, the UK is likely to experience weather that is driven straight in from the Atlantic. This is characterized by wet and windy weather with temperatures near to average. This condition is often termed zonality as the warm and cold air masses are clearly defined by a straight fast flowing jet.
During periods when the jet stream is amplified the pattern will be different. This is often termed meridional with polar air travelling further south than usual and warmer sub tropical air travelling further north. The exact positioning of the amplification of the jet stream will determine whether or not the UK is in cold polar air or warmer air from lower latitudes. If a meridional pattern becomes stagnant then the UK may experience either of these conditions for a period of time and the pattern may be known as blocked.
Summary of the Jet Stream and the weather it creates:
The position of the jet stream over the UK determines the type of weather we experience.
If the polar front jet is situated significantly to the south of the UK we will experience colder than average weather.
If the polar front jet is situated to the north of the UK we will experience warmer than average weather.
If the polar front jet is situated over the UK we will experience wetter and windier than average weather.
If the polar front jet has a large amplification then cold air will travel further south than average and warm air will travel further north than average.
The direction and angle of the jet stream arriving at the UK will determine what source of air (i.e. cold, dry, warm, wet, from maritime or continental sources) the UK experiences.
(c) Ed O'Toole www.netweather.tv