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Re: Transcriber Weather
Posted: Fri Jan 08, 2021 1:22 am
by Morgan
Randi wrote:
Snow has advantages
Porch pirate gets stuck in snowbank during attempted getaway
It took him just a little too long!
That is weather justice!
We just replaced the rain gauge, now for some rain!
Re: Transcriber Weather
Posted: Sat Jan 16, 2021 4:17 pm
by Randi
Snow!
There isn't too much on the ground yet, but it is coming down pretty enthusiastically
Re: Transcriber Weather
Posted: Sat Jan 16, 2021 5:02 pm
by Michael
This is how the Norwegian Met Service interprets the European Community Medium Range Weather Forecast numerical data for Pittsburgh...
Code: Select all
YYYY/MM/DD/ Hour Day Weather TT DDD/FFF Pcp
2021/01/16/12:00 Saturday Sleet 2 WSW/004 0.7
2021/01/16/13:00 Saturday Snow 1 WSW/011 0.8
2021/01/16/14:00 Saturday Cloudy 1 WSW/011 0.1
2021/01/16/15:00 Saturday Light sleet 2 WSW/011 0.1
2021/01/16/16:00 Saturday Snow 2 WSW/014 0.3
2021/01/16/17:00 Saturday Light snow 0 W/018 0.1
2021/01/16/18:00 Saturday Partly cloudy 0 W/014 0
2021/01/16/19:00 Saturday Partly cloudy 0 WSW/014 0.1
2021/01/16/20:00 Saturday Light flurries -1 WSW/014 0.2
2021/01/16/21:00 Saturday Partly cloudy -1 WSW/014 0.1
2021/01/16/22:00 Saturday Partly cloudy -2 WSW/014 0
2021/01/16/23:00 Saturday Partly cloudy -2 WSW/014 0
Here's how I interpret the Canadian Met Service Regional Model forecast data for Pittsburgh...
Code: Select all
Date Hour Wx TT Dir/Spd RH Pcp Max/Min
Sat Jan 16 1 PM Light Snow 0 SSW/005 100 1.4
Sat Jan 16 2 PM Light Snow 0 SW/005 100 1.6
Sat Jan 16 3 PM Light Snow 0 WSW/007 100 1.0
Sat Jan 16 4 PM Cloudy 1 WSW/008 93 0
Sat Jan 16 5 PM Cloudy 1 WSW/009 93 0
Sat Jan 16 6 PM Mainly Cloudy 0 WSW/009 100 0
Sat Jan 16 7 PM Mainly Cloudy 0 WSW/009 100 0
Sat Jan 16 8 PM Cloudy 0 WSW/011 100 0
Sat Jan 16 9 PM Mainly Cloudy 0 WSW/011 100 0
Sat Jan 16 10 PM Cloudy 0 WSW/013 100 0 Max 3
Sat Jan 16 11 PM Cloudy 0 WSW/013 100 0
Re: Transcriber Weather
Posted: Sat Jan 16, 2021 5:25 pm
by Randi
For the moment the snow has stopped and it is overcast
Re: Transcriber Weather
Posted: Tue Jan 19, 2021 7:23 am
by jil
Just at the start of an Amber warning for rain from
Storm Christophe that goes on until Thursday. I'm only just inside the area covered so I'm hoping it won't be too bad. Bring back the snow and ice!
Re: Transcriber Weather
Posted: Tue Jan 19, 2021 7:33 pm
by Morgan
I am interested in your "Amber Alert." I presume from looking at the website that this is a warning midpoint between "red" or high and something "green" and lower level? In California an "Amber" alert is a broadcast warning of a child abduction. It is named for a young girl named "Amber." If, in a group of people, everyone's phone goes off at the same time, we know an alert has been issued. Occasionally there will be a weather related alert and we are just starting to get seismic alerts this way. But "Amber" is for Amber.
Re: Transcriber Weather
Posted: Tue Jan 19, 2021 8:37 pm
by studentforever
Yes, it represents the middle light on our traffic lights which signals 'be prepared to act'. In the case of floods it suggests in properties at risk that you start moving belongings upstairs, packing emergency bag, including insurance details, passport, driving licence etc and prepare any house defences you have etc,
The red warning often means evacuating for properties at risk. Obviously, in the red areas not all properties will be at risk but it also says that you are likely to find many roads flooded so moving around the district may be dangerous. If the plans are working well then inhabitants of properties at risk should be guided on safe evacuation routes and there should be emergency shelter available - often halls, schools or similar for people who haven't got family or friends who can offer shelter - my brother used to be on the team manning his local 'command' centre.
Re: Transcriber Weather
Posted: Tue Jan 19, 2021 10:10 pm
by jil
The UK Met Office has 3 levels of alert Yellow, Amber & Red all used for the different problematic weather conditions rain, wind, snow/ice. Then the Environment Agency (who deal with river and sea flooding in England) also have 3 levels but call them something different although the symbol for lowest one is a yellowy/orange colour and the 2 serious ones are coloured red.
Re: Transcriber Weather
Posted: Wed Jan 20, 2021 1:21 am
by Michael
I have been having fun analyzing the data produced by the Canadian Meteorological Centre. The amount of data is HUGE, but I have been using just a select few datafiles. For these two images, I have been calculating the height at which rain changes to snow, and comparing it to the elevation at a given point. In this case, I downloaded the High Resolution data for western Canada, which gives data for about 50 vertical levels for points on a 2.5x2.5 km grid. The grid itself has 332,226 points and Google Earth just can't cope with that many. So, I selected points just to cover Vancouver Island. In this case, from a few days ago, Rain is Green and Snow is White. You can see in this image that Victoria is blessed by being in the rain shadow from the Olympic Peninsula across the Strait of Juan de Fuca.
For this image, I zoomed in with Google Earth. You can see the density of the points, and the amount of snow forecast in the six hour period for the one point that I clicked on.
If I had more time, more computer horsepower and better display tools, I could generate images like this to show Snow and Rain moving in from the Pacific Ocean over a 48 hour period. CMC does have data that covers the world on a 25x25 km grid every three hours out for ten days, so I could do a similar thing for Scotland or any other part of the world.
Re: Transcriber Weather
Posted: Wed Jan 20, 2021 4:59 pm
by Morgan
WOW! This is really interesting. This is a long ways from handwritten logs!
Re: Transcriber Weather
Posted: Wed Jan 20, 2021 8:12 pm
by jil
Cool maps, Michael!
If you're interested in the Met Office weather warnings have a look at
Thursday's map. I don't think I've ever seen so many different ones at once: Yellow for rain, snow, wind & ice; Amber for rain and snow.
The temperature's definitely dropping, it was 10C overnight last night, about 5C now and predicted to drop to 1C tonight.
Re: Transcriber Weather
Posted: Wed Jan 20, 2021 8:25 pm
by Randi
Sunny here for the moment!
Re: Transcriber Weather
Posted: Wed Jan 20, 2021 11:37 pm
by AvastMH
Great maps Michael
Here's the Met Office that jil posted:
And here's the Warning impact matrix that you get in the details:
Forget the umbrella - fetch a boat
Re: Transcriber Weather
Posted: Thu Jan 21, 2021 12:00 am
by Randi
We had sun today although it stayed below freezing almost the whole day.
Re: Transcriber Weather
Posted: Thu Jan 21, 2021 6:53 am
by jil
Joan, I'm glad you posted that image. This morning the weather (or the Met Office!) has calmed down and most of the rain and wind warnings have gone, so the link doesn't look as impressive now. Although I think the warnings were originally in effect until noon.
Re: Transcriber Weather
Posted: Thu Jan 21, 2021 1:30 pm
by studentforever
This is the market town where I grew up and my brother still lives. Fortunately his house is at the top of the river valley so safe from flooding. However, a friend of my late father lives in Weaver Court so I hope he is OK.
https://www.bbc.co.uk/news/uk-england-m ... e-55750420
Re: Transcriber Weather
Posted: Thu Jan 21, 2021 2:34 pm
by Michael
That's terrible! Poor people.
Re: Transcriber Weather
Posted: Thu Jan 21, 2021 4:25 pm
by Randi
And what a mess to come home to
Re: Transcriber Weather
Posted: Thu Jan 21, 2021 5:19 pm
by studentforever
They're now evacuating people
https://www.bbc.co.uk/news/uk-england-m ... e-55750420
Mind you, I don't remember it but I was assured that when I was a baby the floods were several feet deep in the town centre. The WHOLE town centre was raised by some 3 feet. Because of medieval salt mines (small and unrecorded) subsidence was common so all buildings were built with rafts, including some of the wooden framed ones. So, clear the foundations, jack up building, put in extension to services, connect up and brick up extension. I do remember seeing some of those buildings, including my future bank, being raised. They've now attempted to stabilise things with lots of grout but I await developments. I do remember seeing a mark part way up the stairs of the local cinema marking the extent of the flood.
Re: Transcriber Weather
Posted: Thu Jan 21, 2021 9:46 pm
by jil
It's bad enough being flooded out in normal times but extra stressful at the moment.