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Short range model discussion - into 2018

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On 07/09/2018 at 07:48, knocker said:

The ecm not dissimilar to the gfs Mon/Tues

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And the 0600 geostationary image

geo.thumb.JPG.940b23826bbdbb39c965389e93d05c5e.JPG

Can I ask where you find the visible satellite images?  Thanks.

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The main wodge of rain, currently north of Manchester, will move into the North Sea this evening giving way to squally showers in northern Scotland where it will also become quite windy as the low pressure area tracks east. But through the night the line of rain associated with the front will track slowly south

PPVE89.thumb.gif.ccfd5a6cc4338bb560eeab868b3f2aff.gifg01.thumb.png.6580d80e90e71766294bf618aa872e6b.pngg04.thumb.png.553999cbd8ac0373a5cc4720fc599cee.png

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1 hour ago, knocker said:

The main wodge of rain, currently north of Manchester, will move into the North Sea this evening giving way to squally showers in northern Scotland where it will also become quite windy as the low pressure area tracks east. But through the night the line of rain associated with the front will track slowly south

 

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Not too much for folks in the south to get excited about rainfall wise in the south then, Knocker?

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10 minutes ago, Dorsetbred said:

Not too much for folks in the south to get excited about rainfall wise in the south then, Knocker?

No Dorset

totalprecip_d02_48.thumb.png.a0563cf03949f57629af22702ebd8628.png

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The ecm this evening curves TS Helene up into the central Atlantic where it phases with the trough ans eventually hitches a ride with the very intense upper low that has been ejected from northern canada. Well that's the current theory

ecmwf_uv850_vort_atl_5.thumb.png.93f491619f556fb9b5dc7a8b945d4efa.pngecmwf_uv850_vort_atl_6.thumb.png.03300bdb537ce7223809b3240605c5f8.png120.thumb.png.9a3f103477b60c035ba2077309c8fa5c.png

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A changeable but relatively quiet week, albeit still inclined to to a NW/SE split but with an invigorated vortex and the remnants of tropical storms in the mix the possibility of some wet and windy weather in the near future is becoming a favored option. But that's getting ahead of ourselves so the current NH profile and surface analysis at midnight.

gfs_z500a_nh_1.thumb.png.f0f672b5be4e9cb1fe902cc18d948502.pnggfs_uv250_nh_1.thumb.png.e712d0669373c4ae88581db766d51dbf.pngPPVA89.thumb.gif.11127d7754222b1285f408b58498d02c.gif

The rain associated with the fronts is currently over northern England and Wales and this will move slowly south during the day tending to fizzle out as it goes. But the movement of the waving front and precipitation intensity is not straight forward and pulses of rain tend to run along it as it slows, and even trots north again for a  time, intensifying the rain once more. So the south/south east will remain dry whilst further north over west Scotland the squally showers will persist.

PPVE89.thumb.gif.9c080b8c9ae62d438df90f8853747a80.gifgfs_t2max_c_uk2_4.thumb.png.a4f7d7a27ebd31a485456f05ac8dd491.pngg.thumb.png.dded9972afdbd5e29ed0afd9e44b7c75.png

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So during the evening and overnight the intensifying band of rain will move north for a while before once again tracking south and clearing the south coast by midday Wednesday. Meanwhile the blustery showers will continue, mainly over western Scotland but also some activity over N. Ireland and north west England. By the end of the day all of the UK is in the cooler air.

PPVG89.thumb.gif.fe970ec29aa28339334ea4ef14f0efb8.gifPPVI89.thumb.gif.838241704203dc5e19dfd00a9d817d20.gifgfs_t2max_c_uk2_8.thumb.png.0d603468dba178c9d8019c7ffe494058.png

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By Thursday we are in a N/S scenario with sunny interval and dry over much of England and Wales whilst further north, as low pressure skirts Scotland and the weakening cold front tracks south, blustery showers will again be the order of the day.

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A very similar day on Friday with the showers moving a tad further south

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Saturday will mostly be dry and fairly sunny with just a few showers still in the north west but by early evening rain will be approaching Ireland from the next frontal system.

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And the NH profile at T120 and the onset of the shenanigans from the vortex and the TS remnants

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Edited by knocker
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Meanwhile with Florence stalling due to a lack of any steering mechanism such as an upper trough

 

Edited by knocker

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The ecm has TS Helene drifting north and starting to engage with the Atlantic trough. The key to future movement may well be down the strength and direction of ridging to the east and thus wind and rain impacts on the UK and possible WAA

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Edited by knocker
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Greetings- nice thread,hope you don't mind me butting in...David

As well as the tropical systems I think it's worth pointing out the conveyor belt of moisture affecting the NW UK. The pattern is just mobile enough to avoid very high accumulations over the Lakes and SW Scotland and the max in IVT (Integrated [water] Vapor Transport) is moving into the North Sea this morning. Radar accumulations suggest only ~50mm in 24hr in parts of the NW  rather than the 100mm+ totals associated with 'Atmospheric River' flooding events.

IR image

https://aviationweather.gov/satellite

MIMIC Total Precipitable Water

http://tropic.ssec.wisc.edu/real-time/mtpw2m/product.php?color_type=tpw_nrl_colors&layer=tpw&prod=natl&timespan=24hrs&anim=html5

IVT product courtesy Ben Moore, 

http://www.atmos.albany.edu/student/bmoore/natlantic_ivt.html

20180911_0645_sat_irbw_h.jpg

mimic_tpw_201809110600.png

201809110600_gfst6_IVT_2_2.png

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The 0900 UTC sat image illustrates quite well the low pressure to the NW and the trailing front. And the 0800 surface chart

geo.thumb.JPG.31c3926da1984815f9c497c26efbd116.JPG08.thumb.gif.19982be05a49c4b256644150f1a0b9b2.gifPPVA89.thumb.gif.7abceac5fb2fb8461552ad5413dc46f1.gif

 

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Blended WV & IR, GFS T+6 850hPa wind vectors (coloured by speed) and windspeed isotachs at 250 hPa valid 06 UTC.

201809110600_gfst6_wvblend.png

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The high res. MODIS at 1300 with the rain currently fizzling out on the front leaving the band of cloud but the next pulse is due this evening Breezy with showers still across N. Ireland and Scotland

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Further to the above and looking at the latest updates it appears that the distribution and intensity of the rain that apparently has been causing one or two headaches is down to an upper cold front swinging in from the south west and following behind the established front with the rain finally not clearing the south until lunchtime tomorrow.

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Further trough ejections from the vortex, north of the blocking HP, is crucial to the following evolution

gfs_z500a_nh_17.thumb.png.65908ff7acc31c0cb864d14344f5e292.pnggfs_z500a_nh_21.thumb.png.ef716eb9ff4398fb717ff9ed75676e70.pnggfs_uv250_nh_21.thumb.png.29aa9862a986627bb2d93c0324cfa2bd.png

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The ecm merges Helene with the developing Atlantic upper trough, which backs the jet stream and initiates height rises to the east resulting in Helene continuing to track NNE west of Ireland.

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And apart from anything else flooding is going to be a problem with Florence

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As a forerunner to what is potentially a wet and windy period for the western half of the UK quite a wet and breezy Sunday in the north

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The cloud and any rain will clear the south east this evening (some ac but clear sky to the north west here now)

1500 UTC

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resulting in a clear night and a touch of ground frost in some places. A continuation of the blustery showers over Scotland shorthly giving way to more persistent rain, fragmenting,  as the front tracks south east during the night.

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Slightly outside the remit of this thread but the ecm this evening is running Helene straight across the UK. Looking at gusts around 80kts along the west coast

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jet.thumb.png.a4fac7675973e7ca010829d8f7395915.png

 

Edited by knocker

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It's apparent that there are two jet streaks around the upper trough. Is Helene getting a boost near the right exit of the easterly one? Any thoughts anyone?

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