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Eugene

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Posts posted by Eugene

  1. Significant upward changes in AAM tendency finally underway which illustrate fully what had being anticipated a month or so back to provide a much more interesting end to the winter period than has been the case. 

     

    High amplitude GWO Phase 4/5 progression, much higher than led to the late Jan/early Feb rather marginal cold spell, underpins a large Asian Mountain Torque event which has ramifications for end of season stratospheric warming.

     

    Following such events, usually the stratosphere responds in about 12 days. I would expect the Berlin site to start advertising this warming in the coming days.

     

    http://www.atmos.albany.edu/student/nschiral/research/gwo/gfsgwo_1.png

     

    The significance of increasing torques and poleward AAM is to decrease the strength of ridging from the tropics - which has been the feature throughout this winter and created the dominant +NAO profile in the Atlantic and to increase easterly winds across higher latitudes and thus support blocking to higher latitudes than we have seen for some considerably long time - and prior to the winter season.

     

    Alongside the extra tropical GWO signal we have attendant tropical convective amplification MJO signal Phases 7/8 to support Scandinavian blocking

     

    http://i.imgur.com/kBqcw9l.gif

     

    If this scenario was occurring some weeks back it would be receiving much more interest on here than it is at this time

     

    This winter, as everyone knows, failed to produce the -AO feedbacks that created such potent cold pooling as was seen late winter and Spring in 2013 - the wintry conditions then were quite exceptional and are not a prospect this time.

     

    Much depends on orientation of the High which could simply just provide surface conditions ranging from chilly and cloudy stratus from the North Sea, to sunny with cool breezes and overnight frosts if the wind vector has more of a south easterly component. 

     

    All this said, there have been plenty of March cold spells from the north east through the years - so a typical sunshine and wintry showers scenario cannot be ruled out if the High orientates itself to bring sufficiently cold uppers this way. Most especially though aided by an element of retrogression which is quite conceivable as zonal winds at higher latitude become more amenable to this happening - and if the polar vortex dislodges itself from its Canadian/Greenland home.

     

    Too early to be sure, but this may happen as the effects of the +EAMT occur within the polar stratosphere :)

     

     

    Excellent as usual Tamara, yes southeasterlies would be our best hope of pleasant sunny conditions and crisp nights, still puzzled why a respected member still insists on southeasterlies being cloudy, as you say they are most likely to bring in a chilly clear undercut though of course solar power will prevent it feeling that cold in March but I do remember some exceptional cold dewpoints on a stagnant southeasterly drift in the past in March but not sure if the continent supports that this March, still think next winter is when we'll have to wait for the next proper cold spell, just doesn't feel right to me for this Spring even with the great winter like synoptics.

    • Like 5
  2. From looking at all the charts/Metoffice forecasts it does look awful for up here from tomorrow night onwards although with a few clear spells in between.

    Middle of March currently looks sunny, dry and settled - cool across much of the UK during daytime with frosts at night.

    Saturday looks a lovely Spring day for all of England though - it is always around this time of the year I get very jealous of folk living in the South East of England as they begin to see glorious Spring sunshine and pleasant temps. (Looks great for a few days from Saturday)

    Having lots of snow here in Winter makes up for a little bit of my jealously though!

    Get the mower and the beers out! 15 to 16 degrees is perfect early Spring weather (little warmer even better)

    I can't wait for my first spell like that!

    Enjoy!

    Cheers

     

     

    Just checked the UKMO website and for the West Midlands it says its looking rather cloudy next three days with light rain on Sunday and turning cooler with more rain pushing east on Monday, earlier in the week provided much more sunshine here.

    • Like 1
  3. There would be some ice days Chris if the 6z S/E flow rang true..

     

     

    Wow ice days on the 20th of March. :shok:

     

    Same easterly flow trend on GFS 12Z FI.

     

    Until then a mild southwesterly flow with pulses of rain pushing through and the odd ridge day, tuesdays wet weather arrives earlier on monday evening now leaving a fresher sunny tuesday before cloudy drizzly weather for Wednesday, i think a mixed picture sums it up.

    • Like 1
  4. Well fair play to you for confidence , but given the model divergence looking at Tuesday for a wet day is like saying it will be Snowing in Birmingham City Center on December 21st! :rofl: A more unsettled outlook yes, but the buts and whats and whens and hows and whys remain uncertain.....Oh yes and please tell me why you have big bold writing ,when most of us write in lower case! it feels like you are shouting!

     

     

    Yes the potential is there for some heavy rain next tuesday, sorry you can't see that but i can, also sorry for the caps, i posted that on my Xbox One and was having problems, my caps could have been edited instead of you pointing it out, it was no big deal.

  5. I agree,i do not see all this warm weather.The METO medium term has the rain word quite a few times.

    Apart from Sunday there is no real warmth on offer other than in sheltered parts, out of the shade, if its not breezy.

    Any high looks likely to set up to our East not slap bang on top.

    MT8_Manchester_ens.png

     

     

    Indeed and the cooler 850's from the northwest on Sunday are moving in much more swiftly than first thought on lots of ensemble runs and UKMO 12Z, GFS 12Z ensembles are all over the place too for next week, confidence must be very low for next week.

     

    Anybody seen our friend from the Met Office?... Would love to hear his views for next week.

  6. It does seem that the brief warm spell has come out of nowhere, just as some of our cold spells did at short notice over the winter. Look at how much the METO update has changed in 48-72 hours; from talk of cold to very cold to mild to very mild!

     

    Crazy place this UK of ours isnt it, but much fun all the same :D

     

    Having said that, all the chopping and changing probably means we still havent found the final solution yet.....

     

     

    Trust me we have.

     

    However this doesn't preclude further cold spells this Spring, this anticyclonic spell could be a precursor to a cold spell.

     

    Spring isn't one warm season unlike Summer and sees great variation in conditions.

  7. Wouldn't be banking on particularly mild just yet. I suggest expectations of average and then any warmer verification will be a nice surprise. it's a funny time of year for temps. I note Atlanta predicted afternoon T2maxes this week of 21c on wed and 1c Thursday.

     

     

    Voice of reason, similar looking charts in early March before have given chilly days under persistent fog, initialy it could be very mild from the SW but rather cloudy with moist atlantic air but when the high moves over us it will turn cooler esp at night, strange to see charts get praise when just 6 weeks ago they would be called dire.

  8. Yes a bit of a juncture at the moment with various options on the table, ECM firmly sticking with the colder continental feed later next week with a robust scandi high, whereas GFS showing a much less amplified flow flattening any build of pressure quickly..

     

    There are changes forecast over northern hemisphere which will be more conducive to a colder continental feed, should they fall into place i.e. a weakened PV leaving its winter home of NE Canada, but it may take a bit of time to see these changes manifest in a change here.. much will depend on where energy in the forecasted split jet flow will be transferred, next week will see a further plunge of deep cold into NE USA keeping an energised Jetstream.

     

    I'd say 50/50 chance of GFS and ECM verifying.. lots of potential for further swings in the models, easterlies are notoriously difficult to forecast, very often they can only be predicted with confidence 72-96 hrs ahead.

     

    In the meantime topsy turvy weather, early next week will be cold especially in the north.

    Yes a bit of a juncture at the moment with various options on the table, ECM firmly sticking with the colder continental feed later next week with a robust scandi high, whereas GFS showing a much less amplified flow flattening any build of pressure quickly..

     

    There are changes forecast over northern hemisphere which will be more conducive to a colder continental feed, should they fall into place i.e. a weakened PV leaving its winter home of NE Canada, but it may take a bit of time to see these changes manifest in a change here.. much will depend on where energy in the forecasted split jet flow will be transferred, next week will see a further plunge of deep cold into NE USA keeping an energised Jetstream.

     

    I'd say 50/50 chance of GFS and ECM verifying.. lots of potential for further swings in the models, easterlies are notoriously difficult to forecast, very often they can only be predicted with confidence 72-96 hrs ahead.

     

    In the meantime topsy turvy weather, early next week will be cold especially in the north.

    Yes a bit of a juncture at the moment with various options on the table, ECM firmly sticking with the colder continental feed later next week with a robust scandi high, whereas GFS showing a much less amplified flow flattening any build of pressure quickly..

     

    There are changes forecast over northern hemisphere which will be more conducive to a colder continental feed, should they fall into place i.e. a weakened PV leaving its winter home of NE Canada, but it may take a bit of time to see these changes manifest in a change here.. much will depend on where energy in the forecasted split jet flow will be transferred, next week will see a further plunge of deep cold into NE USA keeping an energised Jetstream.

     

    I'd say 50/50 chance of GFS and ECM verifying.. lots of potential for further swings in the models, easterlies are notoriously difficult to forecast, very often they can only be predicted with confidence 72-96 hrs ahead.

     

    In the meantime topsy turvy weather, early next week will be cold especially in the north.

  9. Looking very interesting to say the least . But let's remeber the infamous failed easterly of dec 2012 , we get led up the garden path time and time again , agreed the teleconnections do tie up this time with the jet digging South , and WAA from the amplified low digging out the states pushing well North , the following pressure rise initially looks a good bet , it's what happens after that that's up for debate , does it sink ? Does it head east ? Does it sit over us ? Even if it heads East we need perfect orientation of the high to drag bitter cold air towards us .

    I really do hope we get this , we deserve it lol . My heart says yes gonna happen , my head tells me the heart is treacherous and don't get sucked in again !

     

     

     

    I'd rather remember the great legendary easterly of March 2013/early April 2013.

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