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Wetterzentrale

This section is simply describing what the various lines, coloured areas are, what interval/units the contours, isobars, colour-filled areas use etc. The use, org meteorological significance of the fields are dealt with in a separate section ... here.

The Wetterzentrale site is here.

IMPORTANT: I am not going to attempt a description of the full range of products, just the ones that might be most useful to those who want to 'dip-in' without much knowledge. Also, the fields presented below are not necessarily from the same situation, run-time etc. They are there simply to aid a quick identification of each product. You will note that the products from this site are mirrored on the 'Westwind' site, so many of the notes are applicable to each.


 

WETTERZENTRALE: 'TOPKARTEN'

 

UK Met Office (UKMO)

NB: scales referred to in the table below only appear on this site for individual frames, NOT on composite or looped imagery.

 Example: Brief description of parameters (etc.) on charts shown.
 500 hPa & Bodendruck (MSLP)EC 500 and mslp White lines: MSLP isobars (units = hPa / interval = 5 hPa)
Colour shading: 500hPa height, colour coded as at scale by diagram. (units = dekametres [dam] / interval = 4 dam). Orange/Red high values - blue/indigo etc., low values.
Black line: the 552 dam contour (of the 500 hPa surface) - highlighted as the approx. median value to trace major troughs/ridges in pattern.

 

UKMO modified (FAX) product

 Example: Brief description of parameters (etc.) on charts shown.
 FAX output (final product)
UKMO FAX output
These charts are simply standard 'FAX' charts which depict MSLP isobars (4 hPa intervals), fronts, pressure centres etc., to conventional symbology. For more on these, see the FAQ entry here) and for Conventional frontal symbology: click here for examples & further notes.

 

ECMWF products (ex EC site)

 Example: Brief description of parameters (etc.) on charts shown.
 MSLP isobars and 850hPa predicted wind speed
EC mslp pattern
Black lines: MSLP isobars. (units = hPa / interval = 5 hPa: every 20 hPa, e.g. 980, 1000, 1020, 1040 hPa the lines are bolder - this aids detection of major changes in the pattern.)
Yellow/Green infill: 850hPa wind speed - see scale on right-hand side.
 500 hPa contours
EC 500 hPa pattern
Blue lines: 500 hPa Contours. (units = dekametres [ dam ] / interval = 6 dam.)

 

 ECMWF products (on the Wetterzentrale site)

 Example: Brief description of parameters (etc.) on charts shown.
 500 hPa & Bodendruck (MSLP)EC 500 and mslp White lines: MSLP isobars (units = hPa / interval = 5 hPa)
Colour shading: 500hPa height, colour coded as at scale by diagram. (units = dekametres [dam] / interval = 4 dam). Orange/Red high values - blue/indigo etc., low values.
Black line: the 552 dam contour (of the 500 hPa surface) - highlighted as the approx. median value to trace major troughs/ridges in pattern.

 

GFS (formerly known as AVN / MRF) products

(if any products are missing from this list, see the display at the 'Westwind' site ..... here

 Example: Brief description of parameters (etc.) on charts shown.
 500 hPa height, T (Temperature) & Bodendruck (MSLP)
500 hPa HTB
White lines: MSLPisobars (units = hPa / interval = 5 hPa).
Dark grey/dash & double-dot lines: temperature at 500 hPa (units = degC / interval = 5 degC).
Colour shading: 500hPa height, colour coded as at scale by diagram. (units = dekametres [dam] / interval = 4 dam). Orange/Red high values - blue/indigo etc., low values.
Black line: the 552 dam contour (of the 500 hPa surface) - highlighted as the approx. median value to trace major troughs/ridges in pattern.
 850 hPa height & Temperatur
850 ht & T
White lines: contours of 850 hPa isobaric surface (units = dam / intervals = 4 dam).
Black lines: isotherms of 850 hPa temperature. (units = degC / interval = 5 degC).
Colour shading: temperature at 850 hPa - see scale at side of chart. (units = degC / interval = 2 degC, blue = cold, orange/red = warm).
 Bodendruck (MSLP), Wolken (Cloud) in %, ReTop (Thickness) 500/1000
Wolken,BodenD
White lines: MSLP isobars. (units = hPa / interval =  5 hPa)
Coloured lines: 500-1000hPa thickness isopleths (units = dekametres [dam]; interval 18 dam)
Monochrome shading: % cloud cover based on medium level moisture (i.e. 'frontal') - see scale by side of diagram (black low % cloud values, light grey/white high % cloud values)
 6h - Niederschlag (Precipitation)
6hr Niederschlag
Colour shading: 6 hourly precipitation (rain, snow etc.) in the period up to the time of the chart. See scale at side of chart - the deeper the blue the more precipitation - purple / violet etc., exceptional rainfall / snowfall accumulations. (units = mm): note that on this display there is NO discrimination between rain and snow.
Red dashed-lines: labelled as 'Konvektion', which I interpret as the model detects a high degree of instability in the area.
 2m Temperatur
2m temperature
Black/thin contours: 2m (i.e. 'screen' - level) temperature. (units = degC / interval = 10degC).
Colour shading: 2m temperature as scale at side of diagram. (units = degC / interval = 3 degC). Orange/Red high values - blue low values.
 700hPa und Vertikalbew. (Vertical motion)
700 ht&VB
White lines: contours of 700hPa isobaric surface. (units = dekametres [dam]/ interval 4 dam)
Black line: highlighted 700hPa contour at 300 dam. Useful to trace major changes in the pattern.
Colour shading: vertical motion as scale at side of diagram - yellow to red to violet: upward values; green to blue to violet: downward values. (units = hPa/h; interval 4 hPa/h)
NB: negative is upward motion!
 Bodendruck (MSLP) und 850 Aeq.PT (Theta-E)
Bodendruck & 850TE
White lines: contours of 850hPa isobaric surface. (units = dekametres [dam]/ interval 4 dam)
Black solid/dashed lines: temperature at 850 hPa (solid >= 0degC; dashed < 0degC: units = degC / interval = 5 degC.)
Colour shading: value of Theta E (equivalent potential) temperature at 850 hPa as per shading chart at side/interval = 2 degC.) A better tracer than temperature alone, because it is based upon the dew-point as well as air temperature.
 2m Taupunkt (Dew Point temperature)
2m dewpoint temperature
Black lines (thin): dew point temperature at 'screen' level. (units = degC / interval = 10 degC, but selected values only.)
Colour-shading: See scale at right of diagram: blue, cold & orange/red, warm. ( units = degC / interval = 2 degC.)
 CAPE und Lifted Index
GFS_CAPE and LI output
Grey or White-lines: Lifted Index (units =  degC / interval = 2 degC for values above zero, 1 degC values below zero); solid grey lines > 0 (poor LI values), dashed white lines<=0degC (moderate or 'good' LI values)
Colour-shading: See scale at right of diagram: blue/green - low values of CAPE; orange/red - high values of CAPE (units  = J/kg / interval  = variable, but generally 100 J/kg over much of range.)
 Nds in mm (rot=konvektiv) + 0° - Grenze in m
Freezing Level example
Brown lines: height of freezing level (in metres, above mean sea level).
Colour shading: indication of rainfall (or equivalent rainfall) accumulation per 3 hr.
Individual figures: PPN accumulation in mm (remember, if snow, then it is the equivalent water).

 

NCEP (GFS) Ensemble products (ENS)

 Example: Brief description of parameters (etc.) on charts shown.
 500 hPa mean contour pattern
500 hPa ensemble mean
Colour-fill: Mean 500 hPa pattern for the entire ensemble - see scale at right. Blue, low values to orange/red high values. (units = dam / interval  = 4 dam)
Black line: the mean position of the 552 dekametre [dam] contour at this time step - useful when comparing with other products with same highlight, and to check run-to-run consistency.
 500 hPa contour Spaghetti plot
500 hPa spaghetti plot
Blue, red, yellow, green etc. lines: Individual members of a particular ensemble run for 500 hPa contours at 516, 552 and 576 dekametre [dam]. (Click HERE for a brief explanation of Spaghetti plots)
 850 hPa mean temperature pattern
850 ensemble mean temperature
Grey lines: the ensemble meanpattern of 850 hPa temperature. Dashed below zero degC, solid at and above freezing. (units = degC / interval = 5 degC)
Colour-fill: see scale at right. Blue, cold to orange/red warm. (units = degC / interval  = 2 degC)
 850 hPa isotherm Spaghetti plot
850 spaghetti plot of temperature
Blue, red, yellow, green etc. lines: Individual members of a particular ensemble run for 850 hPa isotherms at -15, 0, +15 degC. (Click HERE for a brief explanation of Spaghetti plots)
 Meteogramme
Meteogram
 For explanation of these diagrams (also known as 'plumes'), see HERE