update GFS product names (#1203)

* update GFS product names

* update GFS product names, what's new

* Update docs/sphinx/source/whatsnew/v0.9.0.rst

Co-authored-by: Will Holmgren <william.holmgren@gmail.com>

Author: dpostolovski

docs/sphinx/source/whatsnew/v0.9.0.rst

@@ -116,6 +116,7 @@ Bug fixes
   (:issue:`1065`, :pull:`1140`)
 * Reindl model fixed to generate sky_diffuse=0 when GHI=0.
   (:issue:`1153`, :pull:`1154`)
+* Update GFS product names for GFS v16. (:issue:`1202`, :pull:`1203`)
 
 Testing
 ~~~~~~~
@@ -143,3 +144,4 @@ Contributors
 * Adam R. Jensen (:ghuser:`AdamRJensen`)
 * Joshua Stein (:ghuser:`jsstein`)
 * Tony Lorenzo (:ghuser:`alorenzo175`)
+* Damjan Postolovski (:ghuser:`dpostolovski`)

pvlib/forecast.py

@@ -725,11 +725,11 @@ def __init__(self, resolution='half', set_type='best'):
             'total_clouds':
                 'Total_cloud_cover_entire_atmosphere_Mixed_intervals_Average',
             'low_clouds':
-                'Total_cloud_cover_low_cloud_Mixed_intervals_Average',
+                'Low_cloud_cover_low_cloud_Mixed_intervals_Average',
             'mid_clouds':
-                'Total_cloud_cover_middle_cloud_Mixed_intervals_Average',
+                'Medium_cloud_cover_middle_cloud_Mixed_intervals_Average',
             'high_clouds':
-                'Total_cloud_cover_high_cloud_Mixed_intervals_Average',
+                'High_cloud_cover_high_cloud_Mixed_intervals_Average',
             'boundary_clouds': ('Total_cloud_cover_boundary_layer_cloud_'
                                 'Mixed_intervals_Average'),
             'convect_clouds': 'Total_cloud_cover_convective_cloud',