AtlanticFlamethrower
-
Posts
1,747 -
Joined
-
Last visited
-
Days Won
1
Content Type
Forums
Blogs
Gallery
Events
Learn About Weather and Meteorology
Community guides
Posts posted by AtlanticFlamethrower
-
-
-
-
5 cm here. heavy snizzle continues.
-
4 cm in SWF on hard, flat exposed surface.
all sniZzzzzzle.
Good for snowballs.
They are not too sticky and not too powdery and exploded nicely on impact.
I scrunched some up with my bare hands and 10 seconds later my hands weren't cold or wet.
-
Hi AFF
Nothing Marginal about this
http://www.southendweather.net/
Cant believe your depths down the road, kerbs have gone here and cannot see the grass anymore, and seeing as you are in close proximity to Dan, maybe I am going through to the next round!
The temperature for Southend shows -0.3C. Between 12 pm - 3 pm in urban areas this will almost certainly get above zero. Not saying no snow to fall, but the depths in urban areas will be slightly less had this occurred over night.
I made be under-estimating our snow depth here. We have about an inch.
We'll need another inch to cover the grass tops though.
-
I don't really understand why it would be marginal? Temps here on the south coast aren't even above zero and are not progged to be all day, dew points are low enough all over our region as are the uppers.
In urban areas the temps will get above zero and there should be a slight thaw compacting the snow, making it less deep.
Snow should fall but depending on the intensity the depth won't rise as fast.
-
Temperature is going to enter marginal territory during the midday.
So although I expect snow to fall from the sky, temperature and dew points low enough, I would expect an ongoing thaw especially in urban areas.
I'm expecting the depth to not rise as much as the PPN one might expect would suggest.
-
I wouldn't call this a great snow event as this is all heavy snizzle. 1 cm accumulated over 2 hrs Zzzzzzzzzzzzzzzzzz.
Looking at 3 cm by end of day unless we get a midday thaw as snowfalls.
It won't go down as one of the better events until the grass is gone. We might need more snow during the week to make it notable.
-
South Woodham Ferrers reporting in.
We have a dusting.
-
-
Posting this for general interest.
Site where you can get a graph of current stratospheric temperature, so you can track the ssws.
70mb (90N - 65N)
http://www.cpc.ncep.noaa.gov/products/stratosphere/temperature/
This chart
http://www.cpc.ncep.noaa.gov/products/stratosphere/temperature/70mb9065.gif
-
1
-
-
-
-
Sorry, day late.
10.8C.
My September forecast was terrible and I'm doing badly overall this year. Can't wait for end November, if/when this great contest starts over.
-
Sorry, I forgot! 15.5C.
-
-
16.7C
-
Thanks for the replies John and WS! I'll look through the links when I get some time and the weather changes.
-
-
6.5C
-
Thanks for the link and the explanation. I'm not sure if I'm going to get my head around dry adiabatic lapse rates and such without actually working through examples, but it's fun, and a start, to learn how to read the temperature - and apply it. Sort of, bearing in mind these are forecasts and not highly accurate.
Monday 400-500mb - short / dissipating contrails
Temp: -25°C
Dew Point: -41°C
http://i42.tinypic.com/2hs94p3.png
Tuesday 250mb - long / dissipating contrails
Temp: -58°C
Dew Point: -65°C
http://i42.tinypic.com/4gp4wk.png
Don't know what to make of that yet... need some more observations. Eventually the errors may even out and a pattern may emerge.
-
Don't you just draw a line up? The x-axis says "temperature". Unless you are saying you follow the blue line, in which case what line to you use for the dew point?
-
Wow, never seen a sky with contrails like that.
I think you might want to check your temps for 36,000ft. Basically the length of time that contrails exist is dependent on speed of sublimation which is dependant on the WV content of the air. The less WV in the air the quicker they dissipate and the reverse is true if the air is nearly saturated. If they persist they are spread by the upper winds and you can get almost complete cover the sky.. And don't forget that's a forecast diagram and won't be completely accurate. And of course you can also get distrails due to heat evaporating cloud droplets.
I take you have looked at the Netweather article on the subject? Thanks John.
-20C dew point must be pretty low on the water vapour.
Temp at 250mb (roughly 36'000 feet according to the link I posted) looks to be -10C.
If you have any links to make these observations more accurate, please post!
-
Just had another fly by. It wasn't on flightradar24 but it looked about the same height. The contrail is behaving exactly the same way. Really long contrail but it's dissipating rapidly and will probably all disappear.
March 2013 CET (2012/13 CET Competition)
in Spring Weather Discussion
Posted
6.5C