Jump to content
Snow?
Local
Radar
Cold?
IGNORED

Stratosphere and Polar Vortex Watch


Paul

Recommended Posts

Posted
  • Location: Hoyland,barnsley,south yorkshire(134m asl)
  • Weather Preferences: severe storms,snow wind and ice
  • Location: Hoyland,barnsley,south yorkshire(134m asl)
13 hours ago, Allseasons-si said:

At 30hpa

yesterday v today.

pole30_nh.thumb.gif.c4f48221c3e59ee2cf363e18e77e4cd3.gif1362062468_pole30_nh1.thumb.gif.256be1ba9ce1665fc656561b0eabb29e.gif

Keep on pumping?️

979556066_pole30_nh2.thumb.gif.19a4fbcfd7fb23c363fbcffdb8feedb0.gif

the jma went for a split last night.

JN264-5.thumb.GIF.ab617d0fa9c39cab95d8b2347e77aa19.GIF

Link to comment
Share on other sites

Posted
  • Location: Hoyland,barnsley,south yorkshire(134m asl)
  • Weather Preferences: severe storms,snow wind and ice
  • Location: Hoyland,barnsley,south yorkshire(134m asl)

Thanks Lorenzo

Latest FV3 totally different from the last few days but showing another warming.

gfsnh-10-384.thumb.png.f800053fab4745463a20e0f43223a7f7.png

Link to comment
Share on other sites

Posted
  • Location: Netherlands close to the coast
  • Location: Netherlands close to the coast
18 minutes ago, bluearmy said:

The eps maintaing that split is good enough for me 

 

Eps still confident, even in the mean 

Edited by ArHu3
  • Like 1
Link to comment
Share on other sites

Posted
  • Location: New Forest (Western)
  • Weather Preferences: Fascinated by extreme weather. Despise drizzle.
  • Location: New Forest (Western)

It sure is puzzling with respect to GFS & FV3.

I've seen the suggestions that it has both insufficient layer density in the upper stratosphere and a shortfall of observation data on the Ural High, but in that case, how come yesterday it temporarily seemed to latch on to something much closer to the other modelling?

Odds are we're on course for seeing just how tragic GFS is as a model, and sadly how even the new FV3 still manages to fall short. The alternative outcome just doesn't bear thinking about... the reputation of the Euro/UK + Japan models would be left in tatters, and we'd be left waiting for yet more warming events to finish the job - by which time the tropical cycle would probably be less ideally positioned to maximise impacts for the UK.

 

https://earth.nullschool.net/#current/wind/isobaric/10hPa/overlay=temp/orthographic=-11.99,86.44,337

Too bad the 10 hPa pattern doesn't have the physical capability to translate perfectly downward right now .

 

Really @northwestsnow, it's taken that long to do so? 

Edited by Singularity
;)
  • Like 3
Link to comment
Share on other sites

Posted
  • Location: Netherlands
  • Location: Netherlands
Link to comment
Share on other sites

Posted
  • Location: sheffield
  • Weather Preferences: cold ,snow
  • Location: sheffield

Just a quick question.has a SSW been verified and taken place at this moment in time ?tia

Link to comment
Share on other sites

Posted
  • Location: Brighton (currently)
  • Location: Brighton (currently)
33 minutes ago, northwestsnow said:

GFS still not interested in any split..

Over to EC..

In fact the vortex is strengthening towards the end albeit displaced. 

Link to comment
Share on other sites

Posted
  • Location: Longden, Shropshire
  • Location: Longden, Shropshire
30 minutes ago, karyo said:

In fact the vortex is strengthening towards the end albeit displaced. 

No closer to resolving this!

Link to comment
Share on other sites

Posted
  • Location: Longden, Shropshire
  • Location: Longden, Shropshire
2 minutes ago, northwestsnow said:

Nope.. parrallel also completely backed off as well..

 

A little concerning ........ Are we going to now see the ECM back off also?

Edited by Don
Link to comment
Share on other sites

Posted
  • Location: Slovenia (Maribor)
  • Location: Slovenia (Maribor)

Greetings. This is my first post.

GFS06Z ensemble mean is seeing split vortex in the beginning of january, which is very important. The control one still doesnt see it, but in this kind of events ensembles  are probably the one we need to look at for an accurate forecast. There are 20 ensembles available for us if we look at GFS model, and 50 if we look at EMCWF. I trust the ECMWF much more, that the GFS weather model. it also has a better resolution if  we analyse this two models. I am also very pleased, that there are so many people on this forum, that are monitoring the situation in the stratosfere. Keep on the good work.

 

48414970-2074959089217171-34776766249193

Edited by Redbull165
  • Like 2
Link to comment
Share on other sites

Posted
  • Location: Ås, Norway
  • Location: Ås, Norway
22 minutes ago, Redbull165 said:

GFS06Z ensemble mean is seeing split vortex in the beginning of january, which is very important. The control one still doesnt see it, but in this kind of events ensembles  are probably the one we need to look at for an accurate forecast. 

 

 

Cheers on your first post!

For the record: the GEFS still shows a technical SSW but keeps pushing it back. Meanwhile, the hump in the short term is getting higher and higher (conform the operational runs). 

epsmean10hPa60N.png

Edited by Ruben Amsterdam
Link to comment
Share on other sites

Posted
  • Location: Netherlands
  • Location: Netherlands

From the study I mentioned earlier this day I selected these charts. Predictability of downward propagation of major sudden stratospheric warmings Alexey Yu. Karpechko,et al

Major Sudden Stratospheric warmings (SSW) are striking phenomena of wintertime stratospheric circulation usually defined as a reversal of zonal mean circulation from westerlies to easterlies. SSWs often have significant impacts on tropospheric circulation and cause anomalies in surface climate lasting for up to two months. For this reason, dynamics and predictability of SSW receive considerable attention. It is however well-known that not all SSW cause significant, long-lasting impacts on the troposphere. In order to explain differences in tropospheric impacts following SSWs,
several reasons have been previously proposed, including differences in type of SSW (split or displacement), persistence of stratospheric anomalies, preconditioning of the tropospheric circulation, and whether or not SSW was accompanied by a planetary wave reflection in the stratosphere. Here we address the predictability of tropospheric impacts by SSWs by seeking for early precursors of the impacts. We separate mid-winter SSWs into two groups: those which are followed by significant, long-lasting impacts on the tropospheric circulation (defined in terms of anomalous northern annular mode) and those not followed by significant anomalies in the annular mode. We show that SSWs characterised by a more negative Northern Annular Mode index in the lower stratosphere around 150 hPa and enhanced wave activity propagation to the stratosphere during the first few days following the central date have a larger probability to be followed by
tropospheric impacts, both in reanalyses and in climate model runs. These anomalies play more important role for the subsequent downward propagation of the signal to the troposphere than the type of SSW: whether it is a split or a displacement, or absorptive or reflective SSW. We propose that using these anomalies as precursors of tropospheric impacts of SSW can enhance climate predictability.

Please notice the difference between dSSW and nSSW. With dSSW there is a negative AO around the first day of the SSW. Displacment or split doesn't matter. Tonight's NH-profile shows a positive AO. So according to this study there will be no downwelling to the troposphere.  

lijst avn ssws.PNG

plaatje 1.PNG

ECMOPNH12_240_1.png

Edited by sebastiaan1973
Link to comment
Share on other sites

Guest
This topic is now closed to further replies.
  • UK Storm and Severe Convective Forecast

    UK Severe Convective & Storm Forecast - Issued 2024-03-28 09:16:06 Valid: 28/03/2024 0800 - 29/03/2024 0600 SEVERE THUNDERSTORM WATCH - THURS 28 MARCH 2024 Click here for the full forecast

    Nick F
    Nick F
    Latest weather updates from Netweather

    More rain on the way: Storm Nelson brings gales Thursday, but rain and wind easing for Easter

    Spells of rain or showers with sunshine in between affecting most areas today, snow over northern hills. Storm Nelson arrives tomorrow, bringing gales to southern coasts and windy elsewhere with further showers. Showers and wind easing somewhat into the Easter Weekend. Read the full update here

    Netweather forecasts
    Netweather forecasts
    Latest weather updates from Netweather

    UK Storm and Severe Convective Forecast

    UK Severe Convective & Storm Forecast - Issued 2024-03-27 09:35:27 Valid: 27/03/2024 0900 - 28/03/2024 0600 THUNDERSTORM WATCH - WEDS 27 MARCH 2024 Click here for the full forecast

    Nick F
    Nick F
    Latest weather updates from Netweather
×
×
  • Create New...