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A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!

 
Luisport

User ID: 34831322
Portugal
02/20/2013 03:40 PM

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A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!
Storm Forecast
Valid: Thu 21 Feb 2013 06:00 to Fri 22 Feb 2013 06:00 UTC
Issued: Wed 20 Feb 2013 18:16
Forecaster: GATZEN
A level 1 was issued for the south-east Mediterranean mainly for large hail.

A level 1 was issued for the south Iberian Peninsula mainly for tornadoes.

SYNOPSIS

Cold and dry air masses are present across northern and central Europe through-out the period. Southern Europe is affected by the polar jet stream. A deep lifting trough will move north-eastward during the period reaching Greece on Friday morning. Upstream, a short wave trough will rapidly cross the Iberian Peninsula during the night hours. Ahead of these features, low-level moisture exceeding 8 g/kg low-level mixing ratio will advect north-eastward.

DISCUSSION

East Mediterranean

A deep trough currently centred across Algeria will move north-eastwards during the period. Ahead of this trough, QG forcing will likely result in large-scale lift. The affected air mass is dry and cold at low levels as indicated by latest observations, and stable conditions are expected initially.

Mid-level lapse rates will likely increase especially after Thursday evening when the trough center moves across the Aegean Sea while low-level warm air advection will continue. Additionally, models indicate rapidly increasing boundary-layer moisture near the warm front with low-level mixing ratios of about 8 g/kg. Although this moisture increase is somewhat questionable, some instability may result on Friday morning especially at mid-levels.

As a consequence, some thunderstorms are expected on Thusday starting near Sicily and spreading eastward into the south Aegean on Friday morning. Given the strong deep layer vertical wind shear exceeding 25 m/s, multicells and supercells are not ruled out. Limiting factor will be the rather stable boundary-layer and associated widespread precipitating clouds. However, isolated large hail events may be possible.

Iberian Peninsula

An intense short-wave trough and associated strong mid-level jet streak will enter Iberia on Thursday afternoon, leading to strong QG forcing. A tongue of rich low-level moisture will spread into southern Portugal and Spain ahead of this trough. Lapse rates are rather poor and CAPE is very limited.

However, daytime heating may result in CAPE during the afternoon hours across southern Portugal and Spain, and some thunderstorms may develop. Storm that form may organize into multicells given the strong vertical wind shear exceeding 15 m/s in the lowest 3 km. Additionally, some mesocyclones may form. These may produce an isolated tornado given the strong low-level shear. Limiting factor will be the weak CAPE. During the night hours, low-level cooling will result in decaying storms.
[link to www.estofex.org]

Last Edited by Luisport on 02/22/2013 06:57 AM
Luisport (OP)

User ID: 34831322
Portugal
02/20/2013 04:04 PM

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Re: A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!
[link to www.ecmwf.int]
Luisport (OP)

User ID: 34831322
Portugal
02/20/2013 04:06 PM

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Re: A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!
[link to www.ecmwf.int]
Luisport (OP)

User ID: 34937875
02/22/2013 06:36 AM

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Re: A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!
Storm Forecast
Valid: Fri 22 Feb 2013 06:00 to Sat 23 Feb 2013 06:00 UTC
Issued: Thu 21 Feb 2013 20:45
Forecaster: TUSCHY
A level 1 was issued for the Aegean Sea, Crete and W/SW Turkey mainly for heavy rain, large hail and an isolated tornado event.

A level 1 was issued for parts of the SW Mediterranean mainly for severe wind gusts and an isolated tornado event.

A level 1 was issued for extreme SW Spain and parts of Portugal mainly for an isolated tornado event.

SYNOPSIS

A major high over low blocking pattern is in progress and affects the weather over most of Europe during the following days. Before this pattern finally establishes, a belt of numerous more or less organized vortices extends from the Atlantic all the way to the eastern Mediterranean. Gradually strengthening and structuring of a dominant vortex over S-France/N-Italy finally generates a better defined focus for CI over SW Europe. Also, with more healthy looking WAA further downstream, weak troughs over the E-Mediterranean start to dissolve while shifting a bit north towards the N-Aegean Sea.

North of that belt of vortices, conditions remain very hostile for DMC and even better defined shower streets over the Baltic Sea won't be a focus anymore for sporadic lightning activity as high pressure continues to strengthen with increasing subsidence. Therefore any thunderstorm activity remains confined to the Mediterranean and adjacent areas.

DISCUSSION

... Crete and surrounding areas ...

Negative tilted trough with a gradual decrease in strength dictates the thunderstorm development and scattered thunderstorms likely evolve during the forecast. An ill defined LL depression over SE Greece still produces enough convergent flow over the Aegean Sea to offer mean LL mixing ratios in excess of 8 g/kg. This moisture beneath steep mid-level lapse rates of 8 K/km and more helps to boost MLCAPE to 400 - 800 J/kg with local peaks AOA 1000 J/kg.
Kinematics reveal adequate strength for organized DMC with 15 m/s (3 km) and up to 20 m/s (6 km bulk shear) next to enhanced SRH-3km especially along the NE fringe of the aforementioned LL depression (e.g. along the SW coast of Turkey).

An UVV maximum grazes the area to the south but inserts enough lift for CI and hence, scattered thunderstorm development will be already underway during the start of the forecast and continues all day long. There will be a gradual decay of convection from west to east as backside subsidence of the through spreads east. The main risk will be large hail, especially with the more discrete storms over Crete and potential tail-end charlie storms along the SW coast of Turkey. Inland moving clusters of showers and thunderstorms are expected at least until the afternoon hours, as a 20 m/s LLJ points ashore before backing/weakening thereafter. Beside the hail risk, heavy rain will accompany clustering storms. With the weakening trough, dynamics also do not look impressive and hence the storm clusters should not reveal any higher degree of organization but slow eastward movement of the clusters should offer enough time for some flash flood problems and hence the level 1 was expanded far north along the W-coast of Turkey. The tornado risk is not augmented, but given the expected strong to severe storms atop the Mediterranean with some LLCAPE and enhanced LL shear along the coast, a "mesoscale accident" can't be ruled out and an isolated tornado event is therefore possible.

... Portugal, parts of Spain and the W-Mediterranean ...

The structuring vortex over S-C Europe connects with another vortex over the E-Atlantic, which approaches the Iberian Peninsula during the forecast from the west. This finally fosters the development of an extensive low pressure channel, which runs from Spain to the NE. A plume of subtropical moisture advects to the east ahead of this trough and supports some onshore CAPE although weak mid-level lapse rates within the evolving warm conveyor belt keeps magnitude marginal at best. Hence only 100 - 500 J/kg MLCAPE with slightly higher MUCAPE values are expected. Despite strong shear (6 km bulk shear in excess of 25 m/s), marginal CAPE will likely limit the severe risk and only a few strong thunderstorms are anticipated over S-Portugal/SW Spain. Gusty winds and marginal hail accompany that activity. A marginal level 1 was issued for far SW Spain, where nocturnal thunderstorm activity may see some increase in LL buoyancy. Onshore moving storms therefore may be accompanied by an isolated tornado event.

Cold-core convection further upstream (e.g. most of N-Portugal) evolves in a weakly sheared environment. Nevertheless the lower levels reveal some buoyant signals with stronger LL shear along the coasts so a few cold-core funnels and isolated waterspouts can be expected with that activity. Further inland, an increase of the T-Td spread in the BL may limit that risk somewhat. The main time frame of interest will be 12-00Z with peak activity during the afternoon hours. That's the time, for which a marginal level 1 was issued.

... W-C Mediterranean ...

Over the W/C Mediterranean, numerous cyclonic vortices support an enhanced thunderstorm risk mainly south of the Balearic Islands towards the Tyrrhenian Sea. The main feature of interest will be a disturbance, which moves off Spain at roughly 00Z and moves atop a barolcinic zone just south of the Balearic Islands. A developing depression will be the result which spawns an unstable and sheared warm sector (MLCAPE of 500-1000 J/kg and strong LL shear and DLS). Latest data show the warm sector just to the south of the Islands, but only a small model deviation to the north places the region in the strongly sheared warm sector. A few well organized multicells are forecast with strong to severe wind gusts and isolated large hail. The tornado risk is not zero as SRH remains enhanced within the warm sector but also along an E-W aligned boundary over the Balearic Islands where storms might ingest adequate helicity for some updraft rotation. The activity translates rapidly east and approaches Sardinia during the end of the forecast period.
[link to www.estofex.org]
Anonymous Coward
User ID: 34936544
Greece
02/22/2013 06:38 AM
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Re: A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!
Severe gales here now. Literally can't stand up outside.
Luisport (OP)

User ID: 34937875
02/22/2013 06:41 AM

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Re: A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!
There was some surprise in the evolution of this squall line during the afternoon now, and seems to have been a deepening of the short-wave in which that line was integrated.

This can be a symptom of a greater depth than the model that put off depression (strengthening short by a surge in jet).

So I will raise the level of warning for tomorrow, by its own initiative, because models manteem + - the same pattern.

(6f ---- 08h 16h 6f)

We'll have a cold front tomorrow so well marked in the middle and upper levels, while to the surface air masses manteem up roughly homogeneous, forming a line of rather strong convergence.

The front enters the coast, pushing in front of her a mass of relatively warm air (10-12 ° C dew, locally more), and advance during the morning and mid-afternoon until the interior, keeping associated with a wolf in strong divergent levels Tall and very humid air masses.
If depression basement more than the model predicts, it is possible that there is a rebustecimento warm advection.

The models do not pose much CAPE / LI, however scattered values between 500 and 800J/Kg are possible within the front and pre frontal.
Also are modeled reasonably high levels of balance, and how I think the model may be to overestimate the effect of night cooling and hot sector, it is possible that there is also a substimação instability and equilibrium levels.

However forcing guaranteed dynamic seems to be very strong, and well offset any lack of CAPE ..

As for shear, we have a lot (60 + kts) and especially in the center and south, where there are also good rotational profiles.

These conditions are generally favorable to the occurrence of heavy rainfall, strong winds, and locally well-organized convective phenomena with possible gusts exceeding 100km.h.
Not be excluded because tornadoes levels of condensation baixose the presence of helicity and STP, as well as almost superadiabaticos gradients between 2m and 500m, are quite favorable.





Yellow

- Chance of showers and thunderstorms sometimes moderate
- Possibility of heavy rainfall, locally excessive

Orange

- Chance of showers and thunderstorms
- Chance of precipitation locally excessive
- Possibility of gusts above 80-100km.h
- Possible tornado


(6f 15h 04h ---- Sat)


Attention to the post frontal period.
To predict air masses in the lower levels of origin maritima, with very cold air above.

The CAPE / LI / TT will be high, and it is expected the formation of several lines of convergence where there will be increased helicity in low levels.

The shear is weak in general, but given the instability, creating lines of convergence and very cold air at height are possible cells capable of generating heavy rainfall, hail and even some trunk (especially on the coast).
Also may occur downdrafts / microbursts associated with strong winds (vertical gradient of high theta-e).



Yellow

-Possibility of showers / thunderstorms sometimes moderate

Orange

- Chance of showers / thunderstorms sometimes strong
- Possible hail
- Possibility of strong gusts


SNOW

During the day tomorrow we will have snow sometimes strong in the north and center over 1200m down the quota to 600-800m during the night and early hours of Saturday.

There may be accumulations of up to 30cm above 1500m, with almost blizzard conditions.
[link to www.meteopt.com]
Luisport (OP)

User ID: 34937875
02/22/2013 06:43 AM

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Re: A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!
Severe gales here now. Literally can't stand up outside.
 Quoting: Anonymous Coward 34936544


yes to Greece and all mediterranean region it's bad too... please see the estofex map!
Anonymous Coward
User ID: 34930933
Russian Federation
02/22/2013 06:51 AM
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Re: A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!
[link to www.sat24.com]
[link to www.sat24.com]
damned
Luisport (OP)

User ID: 34939921
Portugal
02/22/2013 07:33 AM

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Re: A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!
Thread: Athens under water after several hours of rainfall!!! Italy too!!! More to come!!!
Anonymous Coward
User ID: 788508
Spain
02/22/2013 07:52 AM
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Re: A level 1 was issued for the South Iberian Peninsula and Mediterranean region for Tornadoes!!!
what about Madrid..will we get snow?..
I want snow!banana2