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Our picks
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Major USA tornado outbreak possible
WeatherArc posted a post in a topic,
A major tornado outbreak is possible in Kansas and Oklahoma on Sunday 6th, May.
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Paul, -
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How to quote a part (or all) of someone's post
Paul posted a guide in Posts and Posting,
While we trial the new 'reply-to' rather than quote button on the community, you may be wondering how to quote someone's post - click here to read a quick guide.-
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Paul, -
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Magpie Mine Aurora
weatherobsuk posted a gallery image in Non-weather related photos,
A spectacular Aurora display over Magpie Mine late evening on Friday 1st Dec 2023.-
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Picked By
Paul, -
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Post in Storms and Convective discussion - July 2023
Zak M posted a post in a topic,
Fantastic lightning earlier at 5am. Super bright too.
Time to get into bed...
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Latest Weather News
Warmth for the weekend but when will it turn to rain?
Temperatures are rising, and with plenty of sunshine on Saturday, we should see 18 to 26 Celsius. A showery breakdown changes things for the start of the new week, but Sunday could still be very warm. Read the full update here
A more settled week, feeling warmer with sunny spells
The showers will fade with more warm sunny spells and rising temperatures. Rain for the far northwest. Increasing air pollution levels in the fine, steady weather. Read the full update here
April 2024 - Was it that cold overall? A look at the statistics
General perception from many is that April was a cold month, but statistics would suggest otherwise, with the average temperature for the whole month coming in just above the 30 year average for the UK as a whole. A warm first half to to the month averaged out the cold second half. View the full blog here
Question
Earthshine
Hi all,
I'm sorry for the very specific question, I've been researching how actually generate a linear tangent model from a ray-tracing algorithm. The papers I've read so far haven't been particularly clear how this is done. The formulation of using a tangent model and gradient descent methods is described here: https://www.ecmwf.int/sites/default/files/elibrary/2018/18542-tangent-linear-and-adjoint-models-data-assimilation.pdf
If anyone is in the field of GNSS radio-occultation or other propagation-based methods I'd greatly appreciate any guidance!
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