rebase and update based on changes to numpy

Author: kgoebber

src/metpy/plots/declarative.py

@@ -587,12 +587,14 @@ class SkewtPanel(PanelTraits, Panel):
     ylimits = Tuple(Int(), Int(), default_value=(1000, 100), allow_none=True)
     ylimits.__doc__ = """A tuple of y-axis limits to plot the skew-T.
 
-    Order is in higher pressure to lower pressure."""
+    Order is in higher pressure to lower pressure. Assumption is that y-limit values are
+    hPa."""
 
     xlimits = Tuple(Int(), Int(), default_value=(-40, 40), allow_none=True)
     xlimits.__doc__ = """A tuple of x-axis limits to plot the skew-T.
 
-    Order is lower temperature to higher temperature."""
+    Order is lower temperature to higher temperature. Assumption is that x-limit values are
+    Celsius."""
 
     ylabel = Unicode(default_value='pressure [hPa]')
     ylabel.__doc__ = """A string to plot for the y-axis label.

src/metpy/plots/skewt.py

@@ -622,21 +622,23 @@ def plot_labeled_skewt_lines(self):
         r"""Plot common skewt lines and labels.
 
         This function plots the three common SkewT lines, dry adiabats, moist adiabats,
-        and mixing ratio lines with labels using a default coloring.
+        and mixing ratio lines with labels using a default coloring. Function assumes
+        that temperature value limits are in Celsius and pressure value limits are in
+        hPa.
         """
         from metpy.constants import Cp_d, Rd
 
         # Get axes x, y limits
         xmin, xmax = self.ax.get_xlim()
-        ymax, ymin = self.ax.get_ylim()
+        ymax, _ = self.ax.get_ylim()
 
         # Pressure for plotting mixing ratio lines
         pressure = units.Quantity(np.linspace(500, ymax, 25)[::-1], 'hPa')
 
         # Set plotting certain mixing ratio values
         mixing_ratio = units.Quantity(np.array([0.1, 0.2, 0.4, 0.6, 1, 1.5, 2, 3,
                                                 4, 6, 8, 10, 13, 16, 20, 25, 30, 36, 42
-                                                ]).reshape(-1, 1), 'g/kg')
+                                                ]).reshape(-1, 1)[:, 0], 'g/kg')
 
         # Calculate the dewpoint at 500 hPa based on the mixing ratio (for plotting mixing
         # ratio values)
@@ -674,10 +676,7 @@ def plot_labeled_skewt_lines(self):
 
         # Add saturation mixing ratio labels
         for i in range(mixing_ratio.m.size):
-            if mixing_ratio.m[i, 0] % 1:
-                val = str(mixing_ratio[i, 0].m)
-            else:
-                val = int(mixing_ratio[i, 0].m)
+            val = str(mixing_ratio[i].m) if mixing_ratio.m[i] % 1 else int(mixing_ratio[i].m)
             _ = self.ax.text(plottd.m[i], 500, f'{val}', ha='center', va='bottom',
                              weight='bold', size=8, color='dodgerblue', clip_on=True,
                              rotation=30)

tests/plots/test_declarative.py

@@ -2247,8 +2247,7 @@ def test_declarative_plot_geometry_points(ccrs):
     return pc.figure
 
 
-@pytest.mark.mpl_image_compare(remove_text=True,
-                               tolerance=3.27 if MPL_VERSION.startswith('3.3') else 0.03)
+@pytest.mark.mpl_image_compare(remove_text=True, tolerance=0.03)
 def test_declarative_skewt_plot():
     """Test plotting of a simple skewT with declarative."""
     date = datetime(2016, 5, 22, 0)
@@ -2276,8 +2275,7 @@ def test_declarative_skewt_plot():
     return panel.figure
 
 
-@pytest.mark.mpl_image_compare(remove_text=True,
-                               tolerance=3.24 if MPL_VERSION.startswith('3.3') else 0.03)
+@pytest.mark.mpl_image_compare(remove_text=True, tolerance = 0.03)
 def test_declarative_skewt_plot_shade_cape():
     """Test plotting of a skewT with declarative and shading."""
     from metpy.calc import parcel_profile