First snow of the season

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Richard Hunt
Posts: 33
Joined: Sat Dec 12, 2015 8:16 pm
Location: Hornsea, East Yorkshire. 10m AMSL

First snow of the season

Post by Richard Hunt » Thu Jan 14, 2016 1:55 pm

I say snow, it's mainly sleet and sqaully rain, nothing is going to lay.

Also my 16th consecutive rain day with the monthly total standing at 46.1mm up to 0900 UTC.

Last dry day was 29th December 2015, the garden is sopping wet.
COL Station: 25020

N 53°54'.185". W000°10'.235"

10m AMSL

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Edward Graham
Posts: 20
Joined: Sat Dec 12, 2015 8:13 pm
Location: Stornoway, Scotland
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Re: First snow of the season

Post by Edward Graham » Thu Jan 14, 2016 10:13 pm

Snow lying (2cm) here in Stornoway since yest (Wed 13th) am - with lightning, thunder and large hail tonight (Thurs 14th). The snow is lying right down to sea-level (in the distance in the photo, perhaps not visible).
12509894_963132590401826_8501536233734131991_n.jpg
12509894_963132590401826_8501536233734131991_n.jpg (48.61 KiB) Viewed 9022 times
Yest (Wed 13th) was actually colder than today (max +2.5C, min -0.9C), due to lighter winds and mostly clear blue skies promoting strong radiation conditions. Even at the 'peak' of the day the grass thermometer didn't rise above -1C, and was down at -5C or -6C most of the day, meaning the salt/grit on the roads hardly functioned.

Today, there's been more of a NW breeze, bringing in modified marine air (max 3.5C, min -1.0C), so the more frequent showers have brought a mix of snow, hail, rain and sleet - but they are freezing immediately on the surface due to continued subzero surface conditions and an 'ice-bulb' effect (dewpoint/wet bulb temp are subzero). Away from the grit/salt, the snow is white, squeaky and hard-packed.

Actually not even our heaviest fall this winter (there was up to 5cm locally in the town on 29th-30th Nov, but what is REALLY WELCOME this time is the much drier, brighter and lower humidity northerly Arctic airmass (after endless weeks of Altlantic greyness, rain and gales) - precip totals are down to 1-2mm/day at present (compared to a typical 6-8mm/day or more in a maritime polar airmass, and 10-35mm/day for a maritime tropical flow).

Eddie Graham, Stornoway
Twitter: https://twitter.com/eddy_weather Blog Aimsir Innse Gall | Hebridean Weather Blog: http://bit.ly/1aVMqGx

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