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<h1>Upper air BUFR Soundings</h1>
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<p>The following script takes you through the steps of retrieving an Upper Air vertical profile from an AWIPS EDEX server and plotting a Skew-T/Log-P chart with Matplotlib and MetPy.</p>
|
|
<p>The <strong>bufrua</strong> plugin returns separate objects for parameters at <strong>mandatory levels</strong> and at <strong>significant temperature levels</strong>. For the Skew-T/Log-P plot, significant temperature levels are used to plot the pressure, temperature, and dewpoint lines, while mandatory levels are used to plot the wind profile.</p>
|
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<pre><code class="python">%matplotlib inline
|
|
from awips.dataaccess import DataAccessLayer
|
|
import matplotlib.tri as mtri
|
|
import matplotlib.pyplot as plt
|
|
from mpl_toolkits.axes_grid1.inset_locator import inset_axes
|
|
import numpy as np
|
|
import math
|
|
from metpy.calc import get_wind_speed, get_wind_components, lcl, dry_lapse, parcel_profile
|
|
from metpy.plots import SkewT, Hodograph
|
|
from metpy.units import units, concatenate
|
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|
|
# Set host
|
|
DataAccessLayer.changeEDEXHost("edex-cloud.unidata.ucar.edu")
|
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request = DataAccessLayer.newDataRequest()
|
|
|
|
# Set data type
|
|
request.setDatatype("bufrua")
|
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availableLocs = DataAccessLayer.getAvailableLocationNames(request)
|
|
availableLocs.sort()
|
|
|
|
# Set Mandatory and Significant Temperature level parameters
|
|
MAN_PARAMS = set(['prMan', 'htMan', 'tpMan', 'tdMan', 'wdMan', 'wsMan'])
|
|
SIGT_PARAMS = set(['prSigT', 'tpSigT', 'tdSigT'])
|
|
request.setParameters("wmoStaNum", "validTime", "rptType", "staElev", "numMand",
|
|
"numSigT", "numSigW", "numTrop", "numMwnd", "staName")
|
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request.getParameters().extend(MAN_PARAMS)
|
|
request.getParameters().extend(SIGT_PARAMS)
|
|
|
|
# Set station ID (not name)
|
|
request.setLocationNames("72562") #KLBF
|
|
|
|
# Get all times
|
|
datatimes = DataAccessLayer.getAvailableTimes(request)
|
|
|
|
# Get most recent record
|
|
response = DataAccessLayer.getGeometryData(request,times=datatimes[-1].validPeriod)
|
|
|
|
# Initialize data arrays
|
|
tdMan,tpMan,prMan,wdMan,wsMan = np.array([]),np.array([]),np.array([]),np.array([]),np.array([])
|
|
prSig,tpSig,tdSig = np.array([]),np.array([]),np.array([])
|
|
manGeos = []
|
|
sigtGeos = []
|
|
|
|
# Build arrays
|
|
for ob in response:
|
|
if set(ob.getParameters()) & MAN_PARAMS:
|
|
manGeos.append(ob)
|
|
prMan = np.append(prMan,ob.getNumber("prMan"))
|
|
tpMan = np.append(tpMan,ob.getNumber("tpMan"))
|
|
tdMan = np.append(tdMan,ob.getNumber("tdMan"))
|
|
wdMan = np.append(wdMan,ob.getNumber("wdMan"))
|
|
wsMan = np.append(wsMan,ob.getNumber("wsMan"))
|
|
continue
|
|
if set(ob.getParameters()) & SIGT_PARAMS:
|
|
sigtGeos.append(ob)
|
|
prSig = np.append(prSig,ob.getNumber("prSigT"))
|
|
tpSig = np.append(tpSig,ob.getNumber("tpSigT"))
|
|
tdSig = np.append(tdSig,ob.getNumber("tdSigT"))
|
|
continue
|
|
|
|
# Sort mandatory levels (but not sigT levels) because of the 1000.MB interpolation inclusion
|
|
ps = prMan.argsort()[::-1]
|
|
wpres = prMan[ps]
|
|
direc = wdMan[ps]
|
|
spd = wsMan[ps]
|
|
tman = tpMan[ps]
|
|
dman = tdMan[ps]
|
|
|
|
# Flag missing data
|
|
prSig[prSig <= -9999] = np.nan
|
|
tpSig[tpSig <= -9999] = np.nan
|
|
tdSig[tdSig <= -9999] = np.nan
|
|
wpres[wpres <= -9999] = np.nan
|
|
tman[tman <= -9999] = np.nan
|
|
dman[dman <= -9999] = np.nan
|
|
direc[direc <= -9999] = np.nan
|
|
spd[spd <= -9999] = np.nan
|
|
|
|
# assign units
|
|
p = (prSig/100) * units.mbar
|
|
T = (tpSig-273.15) * units.degC
|
|
Td = (tdSig-273.15) * units.degC
|
|
wpres = (wpres/100) * units.mbar
|
|
tman = tman * units.degC
|
|
dman = dman * units.degC
|
|
u,v = get_wind_components(spd, np.deg2rad(direc))
|
|
|
|
# Create SkewT/LogP
|
|
plt.rcParams['figure.figsize'] = (8, 10)
|
|
skew = SkewT()
|
|
skew.plot(p, T, 'r', linewidth=2)
|
|
skew.plot(p, Td, 'g', linewidth=2)
|
|
skew.plot_barbs(wpres, u, v)
|
|
skew.ax.set_ylim(1000, 100)
|
|
skew.ax.set_xlim(-30, 30)
|
|
|
|
title_string = " T(F) Td "
|
|
title_string += " " + str(ob.getString("staName"))
|
|
title_string += " " + str(ob.getDataTime().getRefTime())
|
|
title_string += " (" + str(ob.getNumber("staElev")) + "m elev)"
|
|
title_string += "\n" + str(round(T[0].to('degF').item(),1))
|
|
title_string += " " + str(round(Td[0].to('degF').item(),1))
|
|
plt.title(title_string, loc='left')
|
|
|
|
# Calculate LCL height and plot as black dot
|
|
l = lcl(p[0], T[0], Td[0])
|
|
lcl_temp = dry_lapse(concatenate((p[0], l)), T[0])[-1].to('degC')
|
|
skew.plot(l, lcl_temp, 'ko', markerfacecolor='black')
|
|
|
|
# Calculate full parcel profile and add to plot as black line
|
|
prof = parcel_profile(p, T[0], Td[0]).to('degC')
|
|
skew.plot(p, prof, 'k', linewidth=2)
|
|
|
|
# An example of a slanted line at constant T -- in this case the 0 isotherm
|
|
l = skew.ax.axvline(0, color='c', linestyle='--', linewidth=2)
|
|
|
|
# Draw hodograph
|
|
ax_hod = inset_axes(skew.ax, '30%', '30%', loc=3)
|
|
h = Hodograph(ax_hod, component_range=max(wsMan))
|
|
h.add_grid(increment=20)
|
|
h.plot_colormapped(u, v, spd)
|
|
|
|
# Show the plot
|
|
plt.show()
|
|
</code></pre>
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<p><img alt="png" src="../../images/output_1_0.png" /></p>
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</body>
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