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Everything posted by Waterspout
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Model Output Discussion - 15th March onwards
Waterspout replied to Cambrian's topic in Forecast Model Discussion
Just my explanation as I work with GM charts. Temperature is in kelvin so the formula is C = K - 273.15 when producing a chart. If a frame is faulty or missing, which does happen, then the K grid can get filled with -1s or 0’s , which if you don’t account for will give you lots of -273c conversions! I usually deal with this by carrying across the last good frame, which at least prevents a ridiculous looking graph! -
Model discussion - hunt for cold - Christmas countdown
Waterspout replied to Paul's topic in Forecast Model Discussion
Just a comment on UKMET. Link here: Numerical weather prediction models WWW.METOFFICE.GOV.UK The Unified Model is run operationally in a number of configurations for weather forecasting at the Met Office. 6 Days they describe as Short to Medium range. So it goes 1 perhaps. 2 days into what I would understand as medium, hence it’s understandable why some posters don’t believe it’s geared up to be accurate beyond T96 to 120. It is just the way it was designed I guess! Hence why lots of countries invested in the ECMWF, which is a true > Medium range model. -
Model output discussion - is the beast awakening?
Waterspout replied to Paul's topic in Forecast Model Discussion
This was meant to be tomorrow the 3rd, but the upgrade of the IT infrastructure, which is also why some connectivity issues have happened in recent weeks, is behind schedule. It needs to handle twice the Data for v16. This has now moved to “March 2021”. It’s unfortunate as from tomorrow we wouldn’t have had to look at the current version anymore! It would have been consigned to the dustbin, I guess like the 06z Op! As it stand now we have at least another month of v15! -
North West Regional Discussion 30 December 2020 onwards
Waterspout replied to cheshire snow's topic in Regional
Snowing now in Pendlebury, Salford. Covering cars and grass quite quickly. -
The v16 code was actually signed off and approved back in May 2020 by the Ops Director. This Parallel running October to the end of this month is purely “IT” related. The actual verification improvements were assessed by EMC based on the previous year’s initialisation data to evaluate performance compared to v15. They won’t pull the code on a project that started back in 2019, on those Stats you published for the 3 week period you illustrated. This is the new and improved code, even if it’s an overall 1% increase, it’s still improved after extensive testing on long term previous starting data spanning a longer period than those weeks you highlighted.
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North West Regional Discussion 30 December 2020 onwards
Waterspout replied to cheshire snow's topic in Regional
It was thought to be a 1-50 year event, at the least, so later in the Century perhaps.......! 10 years is too soon. But another one could happen in the next 80 years according to the law of averages! Based on 2 per Century? -
North West Regional Discussion 30 December 2020 onwards
Waterspout replied to cheshire snow's topic in Regional
My Cameras picked this up too! Started about 5ish. You’d swear it was snowing! -
North West Regional Discussion 3 June 2020 onwards
Waterspout replied to damianslaw's topic in Regional
Think the Radar watching was the most thrilling part of this event! Got a brief covering from the light stuff, now rain here in Pendlebury, not even our increased elevation of 80m here in one of the higher parts of Salford could help out! Bet that was about half a degree the wrong side of marginal! Next please! -
North West Regional Discussion 3 June 2020 onwards
Waterspout replied to damianslaw's topic in Regional
Unexpected showers formed the last hour, just NW of Manchester moving SE! Perhaps a flake here shortly! -
Model Output Discussions 12z 01/09/2016
Waterspout replied to phil nw.'s topic in Forecast Model Discussion
I really enjoy reading your posts Frosty, and rarely post in here, but let's not get too carried away with hyperbole regarding Autumn Hot spells. A brilliant article by Mr Eden Sums it up, and we are not even Late September yet...... http://www.bbc.co.uk/news/magazine-15127159 -
Model Output Discussion - 05/01/2016 18z onwards
Waterspout replied to Captain Shortwave's topic in Forecast Model Discussion
As Steve and others have pointed out, comparing the GFS 06z to 24 hrs ago highlights the massive changes in pressure distribution to our NE and NW: As an Overlay: As an Error Signal: Circa 30-40 mb in 24 hours - starkly changing between T+120 and T+168 on this mornings run. -
Extracting a dataset from GFS GRIB
Waterspout replied to Qalupalik's topic in Spring Weather Discussion
The Wind dataset in a GRIB file should be stored as 'U' and 'V' components. Extracting the Speed is then SQR(U^2 + V^2) Extracting the Direction a bit more complex: (180 / PI) * ATN( U / V) But then adjust the angle relative to North as follows: If V > 0 Add 180 if U>0 and V<0 Add 360 -
North West England Regional Discussion 18/01/13 12z---->
Waterspout replied to A.J's topic in Regional
Snowing again in Sandbach. I think this band is merging with the one coming up from Stoke. I think this is heading to South Manchester. Gaps really filling in again. -
North West England Regional Discussion 18/01/13 12z---->
Waterspout replied to A.J's topic in Regional
Shows as just West of you on the 1815 - it's definately expanding as it encroaches. -
North West England Regional Discussion 18/01/13 12z---->
Waterspout replied to A.J's topic in Regional
Seems to have merged now with that little finger coming down from Runcorn/Widnes(1815 Radar). Looks like it's reached Crewe now, just West of me. Wind increasing here, and moon now gone completely. -
North West England Regional Discussion 18/01/13 12z---->
Waterspout replied to A.J's topic in Regional
Yep, 18:00 radar shows band still coming and some echoes now popping up ahead of it. Just losing the Moon again now in Sandbach. My Snowman is a good talisman I think -
North West England Regional Discussion 18/01/13 12z---->
Waterspout replied to A.J's topic in Regional
Finally stopped snowing in Sandbach about an hour or 2 ago, probably 8-9 hours in total of varying intensities.. Snowman done - was rather dry so problems rolling the head, but got there in the end! I do have my eye on that 'blob' of precipitation now finally moving NE from East of Chester - seems to be getting it's skates on now comparing the 1730 / 1715 radars. I have claimed it - come along now....... -
North West England Regional Discussion 18/01/13 12z---->
Waterspout replied to A.J's topic in Regional
That must be the UHI of Crewe! Just 3 miles East of you, in Wheelock, still -0.6 C LOL! -
North West England Regional Discussion 18/01/13 12z---->
Waterspout replied to A.J's topic in Regional
DIscounting any drifts (which are about 6" up the windows) about 3" here Nr Sandbach @ -0.9 C. Very fine and light now, blowing about alot. Looks like something pepping up again to the South West. So, may be not done yet! -
North West England Regional Discussion 18/01/13 12z---->
Waterspout replied to A.J's topic in Regional
Well, the 11:15 radar shows the really heavy band now squeazed from a line Middlewich down through Sandbach/Crewe and down to Stoke. Still very heavy outside here, so it seems stuck here LOL! (and the recyling bin just came in a Blizzard and 3-4 inches of snow! - that would never have happened when I lived in LIverpool - LOL!