Changes to RRFS lwtp plot. (#246)

* Changing AKRange subdomain for Alaska.

* Adding a new plot, which is an amalgamation of a new field (lightning) and 1h total precip.

* Some changes made for lwtp plot: removed lower precip contour levels.

adb_graphics/default_specs.yml

@@ -1115,9 +1115,9 @@ ltng: # Lightning
     unit: strikes / hr
 lwtp: # Lightning with total precip
   sfc:
-    clevs: [0.002, 0.01, 0.05, 0.1, 0.25, 0.50, 0.75, 1.0, 2.0]
+    clevs: [0.25, 0.50, 0.75, 1.0, 2.0]
     cmap: gist_ncar
-    colors: pcp_colors
+    colors: pcp_colors_high
     contours:
       ltng_sfc:
         colors: black

adb_graphics/specs.py

@@ -303,6 +303,16 @@ def pcp_colors(self) -> np.ndarray:
                           ([25, 50, 60, 70, 80, 85, 90, 115])
         return np.concatenate((grays, ncar))
 
+    @property
+    def pcp_colors_high(self) -> np.ndarray:
+
+        ''' High values color map for Hourly Precipitation '''
+
+        grays = cm.get_cmap('Greys', 2)([0])
+        ncar = cm.get_cmap(self.vspec.get('cmap'), 128) \
+                          ([70, 80, 85, 90, 115])
+        return np.concatenate((grays, ncar))
+
     @property
     def pmsl_colors(self) -> np.ndarray: