diff --git a/.circleci/conda_env.yml b/.circleci/conda_env.yml
deleted file mode 100644
index 4df7936..0000000
--- a/.circleci/conda_env.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-name: wrf-python
-channels:
-  - conda-forge
-dependencies:
-  - gcc_linux-64
-  - gfortran_linux-64
-  - setuptools
-  - python
-  - numpy
-  - wrapt
-  - xarray
-  - netcdf4
diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 469988b..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,99 +0,0 @@
-# Python CircleCI 2.0 configuration file
-#
-# Check https://circleci.com/docs/2.0/language-python/ for more details
-#
-version: 2
-jobs:
-  lint:
-    docker:
-      - image: circleci/python:3.6.1
-
-    working_directory: ~/repo
-
-    steps:
-      - checkout
-      - run:
-          name: install pycodestyle
-          command: |
-            sudo pip install pycodestyle
-      - run:
-          name: run pycodestyle
-          command: |
-            pycodestyle src test
-
-  build:
-    docker:
-      # specify the version you desire here
-      # use `-browsers` prefix for selenium tests, e.g. `3.6.1-browsers`
-      - image: circleci/python:3.6.1
-
-      # Specify service dependencies here if necessary
-      # CircleCI maintains a library of pre-built images
-      # documented at https://circleci.com/docs/2.0/circleci-images/
-      # - image: circleci/postgres:9.4
-
-    working_directory: ~/repo
-
-    steps:
-      - checkout
-
-      # Download and cache dependencies
-      - restore_cache:
-          keys:
-          - v1-dependencies-{{ checksum ".circleci/conda_env.yml" }}
-
-      - run:
-          name: install conda and dependencies
-          command: |
-            test -d ~/miniconda3 && exit 0
-            echo "Installing a fresh version of Miniconda."
-            MINICONDA_URL="https://repo.continuum.io/miniconda"
-            MINICONDA_FILE="Miniconda3-latest-Linux-x86_64.sh"
-            curl -L -O "${MINICONDA_URL}/${MINICONDA_FILE}"
-            bash $MINICONDA_FILE -b
-            source ~/miniconda3/bin/activate root
-            conda env create -f .circleci/conda_env.yml
-
-      - save_cache:
-          paths:
-            - ~/miniconda3
-          key: v1-dependencies-{{ checksum ".circleci/conda_env.yml" }}
-
-      - run:
-          name: build wrf-python
-          command: |
-            source ~/miniconda3/bin/activate wrf-python
-            unset FFLAGS
-            unset LDFLAGS
-            unset CFLAGS
-            cd fortran/build_help
-            $FC -o sizes -fopenmp omp_sizes.f90
-            LD_LIBRARY_PATH=~/miniconda3/envs/wrf-python/lib python sub_sizes.py
-            cd ..
-            $FC -E ompgen.F90 -fopenmp -cpp -o omp.f90
-            cd ..
-            python setup.py config_fc --f90flags="-mtune=generic -fopenmp" build_ext --libraries="gomp" build
-            python setup.py install --single-version-externally-managed --record=record.txt
-
-
-      # run tests!
-      # this example uses Django's built-in test-runner
-      # other common Python testing frameworks include pytest and nose
-      # https://pytest.org
-      # https://nose.readthedocs.io
-      - run:
-          name: run tests
-          command: |
-            source ~/miniconda3/bin/activate wrf-python
-            cd test/ci_tests
-            python utests.py
-
-      - store_artifacts:
-          path: test-reports
-          destination: test-reports
-workflows:
-  version: 2
-  build_and_lint:
-    jobs:
-      - build
-      - lint
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..8f51670
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,56 @@
+name: CI
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+  # schedule:
+  #    - cron: '0 0 * * *' # Daily “At 00:00”
+
+jobs:
+  test:
+    # if: |
+    #   github.repository == 'NCAR/wrf-python'
+    name: Python (${{ matrix.python-version }}, ${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash -l {0}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ "ubuntu-latest", "macos-latest"]
+        python-version: [ "3.6", "3.7", "3.8", "3.9" ]
+
+    steps:
+      - name: Cancel previous runs
+        uses: styfle/cancel-workflow-action@0.9.0
+        with:
+          access_token: ${{ github.token }}
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          token: ${{ github.token }}
+      - name: Conda setup
+        uses: conda-incubator/setup-miniconda@v2
+        with:
+          activate-environment: wrf_python_build
+          python-version: ${{ matrix.python-version }}
+          channels: conda-forge, ncar
+      - name: Conda install (Darwin)
+        if: matrix.os == 'macos-latest'
+        run: |
+          conda env update --file build_envs/Darwin.yml --prune
+      - name: Conda install (Linux)
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          conda env update --file build_envs/Linux.yml --prune
+      - name: Build WRF-Python
+        run: |
+          cd build_scripts
+          ./gnu_omp.sh
+          cd ..
+      - name: Run tests
+        run: |
+          cd test/ci_tests
+          python utests.py
diff --git a/osx.yml b/build_envs/Darwin.yml
similarity index 89%
rename from osx.yml
rename to build_envs/Darwin.yml
index a9190d0..044292e 100644
--- a/osx.yml
+++ b/build_envs/Darwin.yml
@@ -1,20 +1,21 @@
 # Create full conda environment for development, including some useful tools
-name: develop
+name: wrf_python_build
 channels:
   - conda-forge
 dependencies:
   - python=3
-  - wrapt
-  - numpy
+  - basemap
+  - cartopy
+  - clang_osx-64
+  - gfortran_osx-64
+  - jupyter
   - matplotlib
   - netcdf4
-  - xarray
-  - jupyter
+  - numpy
+  - pycodestyle
+  - setuptools
   - sphinx
   - sphinx_rtd_theme
-  - pycodestyle
-  - cartopy
-  - basemap
-  - clang_osx-64
-  - gfortran_osx-64
+  - wrapt
+  - xarray
 
diff --git a/linux.yml b/build_envs/Linux.yml
similarity index 89%
rename from linux.yml
rename to build_envs/Linux.yml
index 85df06d..60af2aa 100644
--- a/linux.yml
+++ b/build_envs/Linux.yml
@@ -1,20 +1,21 @@
 # Create full conda environment for development, including some useful tools
-name: develop
+name: wrf_python_build
 channels:
   - conda-forge
 dependencies:
   - python=3
-  - wrapt
-  - numpy
+  - basemap
+  - cartopy
+  - gcc_linux-64
+  - gfortran_linux-64
+  - jupyter
   - matplotlib
   - netcdf4
-  - xarray
-  - jupyter
+  - numpy
+  - pycodestyle
+  - setuptools
   - sphinx
   - sphinx_rtd_theme
-  - pycodestyle
-  - cartopy
-  - basemap
-  - gcc_linux-64
-  - gfortran_linux-64
+  - wrapt
+  - xarray
 
diff --git a/win64.yml b/build_envs/Win64.yml
similarity index 85%
rename from win64.yml
rename to build_envs/Win64.yml
index 7c68e41..e9bb70a 100644
--- a/win64.yml
+++ b/build_envs/Win64.yml
@@ -1,19 +1,21 @@
 # Create full conda environment for development, including some useful tools
-name: develop
+name: wrf_python_build
 channels:
   - conda-forge
+  - msys2
 dependencies:
   - python=3
-  - wrapt
-  - numpy
+  - basemap
+  - cartopy
+  - jupyter
+  - m2w64-toolchain
   - matplotlib
   - netcdf4
-  - xarray
-  - jupyter
+  - numpy
+  - pycodestyle
+  - setuptools
   - sphinx
   - sphinx_rtd_theme
-  - pycodestyle
-  - cartopy
-  - basemap
-  - m2w64-toolchain
+  - wrapt
+  - xarray
 
diff --git a/doc/source/contrib.rst b/doc/source/contrib.rst
index e1f1d44..3b2e0ed 100644
--- a/doc/source/contrib.rst
+++ b/doc/source/contrib.rst
@@ -301,19 +301,19 @@ contributing is:
   
   .. code::
   
-     conda env create -f osx.yml
+     conda env create -f build_envs/Darwin.yml
      
   Linux:
   
   .. code::
   
-     conda env create -f linux.yml
+     conda env create -f build_envs/Linux.yml
      
   Win64:
   
   .. code::
   
-     conda env create -f win64.yml
+     conda env create -f build_envs/Win64.yml
      
   Note: For Win64, you will also need VS2015 installed on your system.
   
@@ -321,7 +321,7 @@ contributing is:
 
   .. code::
   
-     conda activate develop
+     conda activate wrf_python_build
      
 - CD to the build_scripts directory.
 
diff --git a/testenv2.yml b/testenv2.yml
deleted file mode 100644
index a3ef85c..0000000
--- a/testenv2.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-# Create full conda environment for development, including some useful tools
-name: testenv2
-channels:
-  - conda-forge
-dependencies:
-  - python=2
-  - wrapt
-  - numpy
-  - matplotlib
-  - netcdf4
-  - xarray
-  - jupyter
-  - sphinx
-  - sphinx_rtd_theme
-  - pycodestyle
-  - cartopy
-  - basemap
-  - clang_osx-64
-  - gfortran_osx-64
-  - pynio
-  - ncl
-  
\ No newline at end of file
diff --git a/testenv3.yml b/testenv3.yml
deleted file mode 100644
index 356bd53..0000000
--- a/testenv3.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-# Create full conda environment for development, including some useful tools
-name: testenv3
-channels:
-  - conda-forge
-dependencies:
-  - python=3
-  - wrapt
-  - numpy
-  - matplotlib
-  - netcdf4
-  - xarray
-  - jupyter
-  - sphinx
-  - sphinx_rtd_theme
-  - pycodestyle
-  - cartopy
-  - basemap
-  - clang_osx-64
-  - gfortran_osx-64
-  - pynio
-  - ncl
-  
\ No newline at end of file