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Parcel method on Skew-T Example
#Metview Macro
# **************************** LICENSE START ***********************************
#
# Copyright 2019 ECMWF. This software is distributed under the terms
# of the Apache License version 2.0. In applying this license, ECMWF does not
# waive the privileges and immunities granted to it by virtue of its status as
# an Intergovernmental Organization or submit itself to any jurisdiction.
#
# ***************************** LICENSE END ************************************
#
# read GRIB data
g = read("thermo_profile.grib")
# extract thermo profile
prof = thermo_grib(
coordinates : [5,0],
data : g
)
# compute parcel path - start from surface
parcel = thermo_parcel_path(prof)
# create plot object for parcel areas
parcel_area = thermo_parcel_area(parcel)
# create plot object for parcel path
parcel_vis = xy_curve(parcel.t, parcel.p,"charcoal","dash",6)
# use default visual definition for t and td profile
prof_vis= mthermo()
# define the thermodynamic view
view = thermoview( type : "skewt",
minimum_temperature : -140,
maximum_temperature : 40,
top_pressure: 50,
subpage_clipping: "ON")
# get profile info for title
info = thermo_data_info(prof)
# define title
title_txt = "Run: " & info.date & " " & info.time & " UTC Step: " & info.step &
" h Lat: " & info.lat & " Lon: " & info.lon
title = mtext(
text_lines: title_txt,
text_font_size: 0.5,
text_colour: "charcoal"
)
# define text lines for info box
txt = nil
txt = txt & [" Mode: " & parcel.start.mode ]
txt = txt & [" Start p: " & round(parcel.start.p,0) & " hPa"]
txt = txt & [" Start t: " & round(parcel.start.t,1) & " C"]
txt = txt & [" Start td: " & round(parcel.start.td,1) & " C"]
txt = txt & [" CAPE: " & round(parcel.cape,3) & " J/kg"]
txt = txt & [" CIN: " & round(parcel.cin,3) & " J/kg"]
if parcel.lcl <> nil then
txt = txt & [" LCL p: " & round(parcel.lcl.p,0) & " hPa"]
txt = txt & [" LCL t: " & round(parcel.lcl.t,1) & " C"]
end if
if parcel.lfc <> nil then
txt = txt & [" LFC p: " & round(parcel.lfc.p,0) & " hPa"]
txt = txt & [" LFC t: " & round(parcel.lfc.t,1) & " C"]
end if
if parcel.el <> nil then
txt = txt & [" EL p: " & round(parcel.el.p,0) & " hPa"]
txt = txt & [" EL t: " & round(parcel.el.t,1) & " C"]
end if
if parcel.top <> nil then
txt = txt & [" TOP p: " & round(parcel.top.p,0) & " hPa"]
txt = txt & [" TOP t: " & round(parcel.top.t,1) & " C"]
end if
# create info box - make sure font is monospace
info_box = mtext(
text_lines: txt,
text_font: "courier",
text_font_size: 0.3,
text_colour: "charcoal",
text_justification: "left",
text_mode : "positional",
text_box_x_position : 14.8,
text_box_y_position : 13.4,
text_box_x_length : 5.2,
text_box_y_length : count(txt)*0.35+0.4,
text_box_blanking : "on",
text_border : "on",
text_border_colour : "charcoal"
)
# define the output plot file
setoutput(pdf_output(output_name : 'parcel_path_skewt_grib'))
# plot the profile, parcel areas, parcel path and info box together
plot(view, parcel_area, prof, prof_vis, parcel_vis, title, info_box)
Parcel method on Skew-T Example
# **************************** LICENSE START ***********************************
#
# Copyright 2019 ECMWF. This software is distributed under the terms
# of the Apache License version 2.0. In applying this license, ECMWF does not
# waive the privileges and immunities granted to it by virtue of its status as
# an Intergovernmental Organization or submit itself to any jurisdiction.
#
# ***************************** LICENSE END ************************************
#
import metview as mv
# read GRIB data
g = mv.read("thermo_profile.grib")
# extract thermo profile
prof = mv.thermo_grib(coordinates = [5,0],
data = g)
# compute parcel path - start from surface
parcel = mv.thermo_parcel_path(prof)
# create plot object for parcel areas
parcel_area = mv.thermo_parcel_area(parcel)
# create plot object for parcel path
parcel_vis = mv.xy_curve(parcel["t"], parcel["p"], "charcoal", "dash", 6)
# use default visual definition for t and td profile
prof_vis = mv.mthermo()
# define the thermodynamic view
view = mv.thermoview( type = "skewt",
minimum_temperature = -140,
maximum_temperature = 40,
top_pressure = 50,
subpage_clipping = "ON")
# get profile info for title
info = mv.thermo_data_info(prof)
# define title
title_txt = "Run: {} {} UTC Step: {} h Lat: {:.2f} Lon: {:.2f}" \
.format(info["date"],info["time"],info["step"],info["lat"],info["lon"])
title = mv.mtext(
text_lines = title_txt,
text_font_size = 0.5,
text_colour = "charcoal"
)
# define text lines for info box
txt = []
txt.append(" Mode: " + parcel["start"]["mode"])
txt.append(" Start p: {:.0f} hPa".format(parcel["start"]["p"]))
txt.append(" Start t: {:.1f} C".format(parcel["start"]["t"]))
txt.append(" Start td: {:.1f} C".format(parcel["start"]["td"]))
txt.append(" CAPE: {:.3f} J/kg".format(parcel["cape"]))
txt.append(" CIN: {:.3f} J/kg".format(parcel["cin"]))
if parcel.lcl != None:
txt.append(" LCL p: {:.0f} hPa".format(parcel["lcl"]["p"]))
txt.append(" LCL t: {:.1f} C".format(parcel["lcl"]["t"]))
if parcel.lfc != None:
txt.append(" LFC p: {:.0f} hPa".format(parcel["lfc"]["p"]))
txt.append(" LFC t: {:.1f} C".format(parcel["lfc"]["t"]))
if parcel.el != None:
txt.append(" EL p: {:.0f} hPa".format(parcel["el"]["p"]))
txt.append(" EL t: {:.1f} C".format(parcel["el"]["t"]))
if parcel.top != None:
txt.append(" TOP p: {:.0f} hPa".format(parcel["top"]["p"]))
txt.append(" TOP t: {:.1f} C".format(parcel["top"]["t"]))
# create info box - make sure font is monospace
info_box = mv.mtext(
text_lines = txt,
text_font = "courier",
text_font_size = 0.3,
text_colour = "charcoal",
text_justification = "left",
text_mode = "positional",
text_box_x_position = 14.8,
text_box_y_position = 13.4,
text_box_x_length = 5.2,
text_box_y_length = len(txt)*0.35+0.4,
text_box_blanking = "on",
text_border = "on",
text_border_colour = "charcoal"
)
# define the output plot file
mv.setoutput(mv.pdf_output(output_name = 'parcel_path_skewt_grib'))
# plot the profile, parcel areas, parcel path and info box together
mv.plot(view, parcel_area, prof, prof_vis, parcel_vis, title, info_box)