Astronomy, Photography and Weather

General Category => Weather & Atmospherics => Topic started by: martinastro on January 18, 2009, 09:55:39 am



Title: Snow Reports - Jan 18th-22nd
Post by: martinastro on January 18, 2009, 09:55:39 am
It has been snowing on and off here since 01.30 UT. This morning there's a good white dusting of snow on the ground. The showers in the post frontal air mass from yesterday's storm which are now moving in from the W are more organized than expected. There could be further snow today and tonight with a risk of thundersnow. Please inlcude your snow reports and images here for this period.


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 18, 2009, 10:50:47 am
Heavy snow!!

Thundersnow at Malin Head.


Title: Re: Snow Reports - Jan 18th-20th
Post by: stuart2588 on January 18, 2009, 11:12:38 am
We had a light dusting of snow this morning in Newtownabbey and had seen it start around 130am.

It has cleared away now so hoping for more today!


Title: Re: Snow Reports - Jan 18th-20th
Post by: Paul on January 18, 2009, 11:33:02 am
Just a light dusting of snow here (Larne) - more visible up on the hills, but now all melted and just started sleeting. The weather forecast seems to have changed beyond recognition - I was expecting to be snowed in tomorrow but that looks less likely now.


Title: Re: Snow Reports - Jan 18th-20th
Post by: brianb on January 18, 2009, 12:14:35 pm
Quote
Heavy snow!!

Thundersnow at Malin Head.
Maybe the same shower / minor trough but we got approx. 1 inch of very wet snow here between 11:15 & 11:45 - already all gone except for isolated slush patches - didn't hear any thunder or see any lightning & there's far too much cloud cover to see the heads of any convective clouds.

The snowfall did temporarily cut the signal on my satellite TV receiver.


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 18, 2009, 12:48:38 pm
Sun has melted 50% of the snow at ground level but there is plenty falling over Slieve Gallion (I have images), the mountain is a white-out at times. I can see convective clouds arriving now. Lots of small cu and orphan anvils blown in from the old storms in the W. During a clearance I did see a whopper cb which was rock solid in apperance!.  The greatest CAPE values are at 15.00 when convection should be greatest. It will drop during the evening but become more unstable later. I think the main snow is yet to come. Met Off have a weather warning about gales and snow tonight/Mon...we shall see.


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 18, 2009, 12:54:01 pm
Here's the sferics charts....

http://andvari.vedur.is/athuganir/eldingar/sferics/today.html

Huge CBs over the Sperrins now to my W.


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 18, 2009, 01:13:34 pm
Here's a few shots of the snow on Slieve Gallion and some convection moving in...

(http://i41.tinypic.com/14ac3gl.jpg)

(http://i44.tinypic.com/34f1t2p.jpg)


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 19, 2009, 03:45:13 pm
Snowing here now.


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 19, 2009, 09:02:36 pm
We had very heavy snow falling here for hours. It looked great. This evening it stopped and began to thaw rapidly which was quite shocking. Water was dripping from the tree branches so there wasm't much to shoot. I should have went out earlier when it was heavy. So took a few shots of the snow on the road side with passing cars...that's all.

(http://i40.tinypic.com/10z5yqs.jpg)

(http://i41.tinypic.com/fjkwlj.jpg)

(http://i39.tinypic.com/31339d4.jpg)

(http://i41.tinypic.com/2mwh2sy.jpg)

(http://i44.tinypic.com/2zewars.jpg)


Title: Re: Snow Reports - Jan 18th-20th
Post by: Roman White on January 19, 2009, 10:26:30 pm
Martin, the first shot looks great!  :)

P.S. Finally I have done my report, I will give a link after I solve the problem with upload.


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 20, 2009, 04:39:42 am
Thanks Roman. Looking forward to the report. Make sure you let us know.

Crazy snow falling here now (04.39). Massive flakes falling at high speed!


Title: Re: Snow Reports - Jan 18th-20th
Post by: rjgjr on January 20, 2009, 05:34:01 am
Great shots Martin. Looks very wet and cold! Love the ghostly image of the vehicle sitting at the intersection. I know this has been discussed in the forum before, how are you achieving the star pattern in the street lights, a star filter or decreasing the f/stop? Great effect!


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 20, 2009, 03:44:09 pm
HI Richard, the star burst effect was caused by using a closed aperture...that usually seems to do the trick. For those images I think the aperture was between F/6 and F/7.1.

I went out before dawn last night (after the above post) and took some video of the snow falling below the street lights lol...I was up for Lulin but there was no chance of that.


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 20, 2009, 11:30:06 pm
Here's a few images and a video clip of the snow before dawn this morning. These were taken at 05.00 UT. I was up for Lulin but that wasn't going to happen. The snow was great though and looked wonderful falling under the street lights. It was so calm and quiet with no human activity about at this hour so it was very special. Images are time exposures, no flash used.

(http://i39.tinypic.com/2chw4zq.jpg)

(http://i43.tinypic.com/33lnk8y.jpg)

(http://i44.tinypic.com/4gg9ie.jpg)

http://www.youtube.com/watch?v=nEAk6XBtRn4


Title: Re: Snow Reports - Jan 18th-20th
Post by: brianb on January 21, 2009, 03:28:35 am
Well at least your weather was interesting - here the promised "sunny periods" was just intermittent rain from definitely non intermittent cloud! Cleared up around 9pm and the sky is really good at the moment, just taking a break, also needed to use the computer to report a (rare) outburst of SW UMa which I detected. Maybe it'll stay clear long enough to see Lulin!


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 21, 2009, 03:44:43 am
Congratulations Brian on catching that outburst!.

Good luck with Lulin. I'm up late waiting to have a go for the comet also. It's a stunning clear freezing night here. Noticed showers moving in from the W on the radar, I just hope to goodness they don't get any closer.

Best of luck.


Title: Re: Snow Reports - Jan 18th-20th
Post by: brianb on January 21, 2009, 12:09:48 pm
Quote
Congratulations Brian on catching that outburst!.
Gonna have to go back on that .... possibly a short lived flare to mag. 13, possibly a mistook :o (in which case there's something else wrong with the field.... Really need an image to check.) Anyway a couple of hours later when I checked it was back to usual (invisible though I could see the mag. 15.2 comparison).

Lulin didn't play ball, there was one small patch of cloud, guess where! Then invaded by stratocumulus at approx. 6:30.

Maybe another chance tomorrow - depending on the timing of the front/trough which is supposed to run through overnight.


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 21, 2009, 04:54:16 pm
I'm sure something had changed within the field for you to notice that it looked different. Keep an eye on it!

Those showers on the radar arrived here but they were in fact more snow!. So I had light snow showers again so no chance of seeing Lulin last night. I reckon you could be correct about the next front moving in, there could be a clearance later. We really need to see this comet!

Good luck.


Title: Re: Snow Reports - Jan 18th-20th
Post by: Tyler on January 21, 2009, 11:45:47 pm
sorry to hear your guy'es troubles, I had a clear night last night, and tested my barndoor tracker, only trouble is that I have to get away from light pollution - so its going to be a while before ill post images from that. But I fixed up my scope today, and am looking forward to some observing tonight! and I really hope I wake up for Lulin in the morning...


Title: Re: Snow Reports - Jan 18th-20th
Post by: Roman White on January 22, 2009, 12:29:24 am
Good luck, Tyler  :)

No chances to see the comet here in the week ahead due to weather  :(


Title: Re: Snow Reports - Jan 18th-20th
Post by: brianb on January 22, 2009, 10:21:06 am
Quote
I reckon you could be correct about the next front moving in, there could be a clearance later.
Hmm, I set the alarm for 5am, sky was clear except for a band of cloud in the W, got dressed & started getting kit ready (in "red light" conditions so as to save dark adaptation time), by 0520 the sky was completely socked in .... checked Met Office web site & discovered large lump of cloud approaching, the clearance was approx. 0415 to 0515 here. Back to sleep (on sofa).


Title: Re: Snow Reports - Jan 18th-20th
Post by: martinastro on January 22, 2009, 04:34:10 pm
I like your red light method Brian. This is something I must do myself, I spend too much time looking at a computer screen which really slows my dark adaption down.

I didn't even get any clear sky (See Lulin thread) but maybe tonight. Good luck.

Since this is a snow thread....there's nice snow on Slieve Gallion this afternoon.  :)