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North West England Regional Discussion Thread 15/1/2018 onwards


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Now remind me why I dont post in the MOD thread oh yes that is it,post deleted because I Mentioned lack of snow and it been coldest part of winter.yet you can post about your Granny and that is o

HEAVY SNOW WOOOHOOOO! 

Mod thread is like stepping into the SE regional thread. Snow in the SE innit fam? Lots of snow...you understand blud?  

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31 minutes ago, Mokidugway said:

Maybe if very lucky 2 0r 3 grams :closedeyes:

Not milligrams??

It'll be very interesting to see where the precipitation turns red on the weather type radar as that will outline where the true cold is.

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Goood good. Actually it's very unusual to see pink/red echoes from the remains of the showers covering well out into the Irish sea which means there's no chance of rain or sleet on the coast even. It'll be just snow all the way.

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GFS 12Z is showing  some precipitation for Wednesday morning associated with a veering of the flow under 517 dam thicknesses and -9°C 850s. Could be exciting. It is also still Showing -9 850s for Friday and again on Monday. 

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Just now, Chris.R said:

 Just a note: I was given to understand that the precipitation type radar was based on model forecasts rather than real-time data. Can’t confirm this though

It might be but it's probably a fairly accurate indicator of where snow is falling .. it's definitely not 100% proof as I've experienced but in general it gives a fairly representation of the situation.

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12 minutes ago, SP1986 said:

It might be but it's probably a fairly accurate indicator of where snow is falling .. it's definitely not 100% proof as I've experienced but in general it gives a fairly representation of the situation.

 Agreed. 

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Some information on precipitation type radar. A bit general but gives you an idea.

Precipitation types

Some displays provided by commercial weather sites, like The Weather Channel, show precipitation types during the winter month : rain, snow, mixed precipitations (sleet and freezing rain). This is not an analysis of the radar data itself but a post-treatment done with other data sources, the primary being surface reports (METAR).[22]

Over the area covered by radar echoes, a program assigns a precipitation type according to the surface temperature and dew point reported at the underlying weather stations. Precipitation types reported by human operated stations and certain automatic ones (AWOS) will have higher weight.[23]Then the program does interpolations to produce an image with defined zones. These will include interpolation errors due to the calculation. Mesoscale variations of the precipitation zones will also be lost.[22]More sophisticated programs use the numerical weather prediction output from models, such as NAM and WRF, for the precipitation types and apply it as a first guess to the radar echoes, then use the surface data for final output.

Until dual-polarization (section Polarization below) data are widely available, any precipitation types on radar images are only indirect information and must be taken with care.

 
 

 

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4 minutes ago, Weather-history said:

Looks it, Euro 4 12z looks out already, precipitation into Ulster now, east of Londonderry.

18020518_0512.gif

Of course it will slow down a bit as it comes up against the block.. it's quite impressive how that block may slow it down though if you think it would normallt take 5 hours or so to get here when the precipitation is not being pressed back. But it could actually taken another 8-9 hours to reach the west coast

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4 minutes ago, Chris.R said:

Some information on precipitation type radar. A bit general but gives you an idea.

Precipitation types

Some displays provided by commercial weather sites, like The Weather Channel, show precipitation types during the winter month : rain, snow, mixed precipitations (sleet and freezing rain). This is not an analysis of the radar data itself but a post-treatment done with other data sources, the primary being surface reports (METAR).[22]

Over the area covered by radar echoes, a program assigns a precipitation type according to the surface temperature and dew point reported at the underlying weather stations. Precipitation types reported by human operated stations and certain automatic ones (AWOS) will have higher weight.[23]Then the program does interpolations to produce an image with defined zones. These will include interpolation errors due to the calculation. Mesoscale variations of the precipitation zones will also be lost.[22]More sophisticated programs use the numerical weather prediction output from models, such as NAM and WRF, for the precipitation types and apply it as a first guess to the radar echoes, then use the surface data for final output.

Until dual-polarization (section Polarization below) data are widely available, any precipitation types on radar images are only indirect information and must be taken with care.

 
 

 

Oh that's really interesting and useful.. so it takes in actual real time data to process the weather type in most cases. 

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8 minutes ago, Day 10 said:

Evening my fellow nutjob's! God it's blooming cold out there now, are we all ready for Snowmageddon!!! :rofl:

Well some of us will dream and some will sample reality.

Great to be in the cosy NW reg thread. I have decided to muse over the MOD thread as any comment (relevant) is still deleted.

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