diff --git a/.github/workflows/ci3.yml b/.github/workflows/ci3.yml
new file mode 100644
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--- /dev/null
+++ b/.github/workflows/ci3.yml
@@ -0,0 +1,144 @@
+name: MODFLOW 6 continuous integration
+on:
+  push:
+    branches:
+      - master
+      - develop
+      - ci-diagnose*
+      - ncci
+    paths-ignore:
+      - '**.md'
+      - 'doc/**'
+  pull_request:
+    branches:
+      - master
+      - develop
+    paths-ignore:
+      - '**.md'
+      - 'doc/**'
+jobs:
+
+  netcdf_test_win:
+    name: netcdf4 testing
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ windows-2022 ]
+        #hdf5: [ 1.12.2 ]
+        #netcdf: [ v4.7.4, v4.8.1, v4.9.0, main ]
+        #netcdf: [ v4.9.0, main ]
+    defaults:
+      run:
+        shell: bash -l {0}
+    env:
+      FC: gfortran
+      GCC_V: 12
+    steps:
+
+      - name: Checkout modflow6
+        uses: actions/checkout@v3
+        with:
+          path: modflow6
+
+      - name: Setup MSYS2
+        uses: msys2/setup-msys2@v2
+        with:
+          update: true
+          install: |
+            git
+            make
+            mingw-w64-x86_64-gcc
+            mingw-w64-x86_64-python
+            mingw-w64-x86_64-python-pip
+            mingw-w64-x86_64-python-pytest
+
+      - name: Setup GNU Fortran ${{ env.GCC_V }}
+        uses: awvwgk/setup-fortran@main
+        with:
+          compiler: gcc
+          version: ${{ env.GCC_V }}
+
+      - name: Install System dependencies
+        shell: msys2 {0}
+        run: |
+          pacman -Syu
+          pacman -S --noconfirm --needed base-devel unzip mingw-w64-x86_64-toolchain mingw-w64-x86_64-libtool mingw-w64-x86_64-cmake
+
+      - name: Setup Micromamba
+        uses: mamba-org/setup-micromamba@v1
+        with:
+          environment-file: modflow6/environment.yml
+          create-args: >-
+            pkg-config
+            netcdf-fortran
+          init-shell: >-
+            bash
+            powershell
+          cache-environment: true
+          cache-downloads: true
+
+      - name: Build modflow6
+        working-directory: modflow6
+        run: |
+          #echo "LD_LIBRARY_PATH=/d/a/_temp/msys64/mingw64/lib" >> $GITHUB_ENV
+          #echo "PATH=/d/a/_temp/msys64/mingw64/bin" >> $GITHUB_ENV
+          #echo "PATH=/d/a/_temp/msys64/mingw64/bin:/d/a/modflow6/modflow6/modflow6/bin:/d/a/modflow6/modflow6/ncf/netcdf-fortran-4.6.0/fortran/.libs" >> $GITHUB_ENV
+          which nf-config
+          which nc-config
+          meson setup builddir -Ddebug=false --prefix=$(pwd) --libdir=bin
+          meson install -C builddir
+
+      - name: Show Meson logs
+        if: failure()
+        working-directory: modflow6
+        run: cat builddir/meson-logs/meson-log.txt
+
+      - name: Check exe
+        working-directory: modflow6/autotest
+        env:
+          REPOS_PATH: ${{ github.workspace }}
+        run: |
+          which dumpbin
+          which dumpbin.exe
+          echo "LD_LIBRARY_PATH:"
+          echo $LD_LIBRARY_PATH
+          echo "PATH:"
+          echo $PATH
+          ls -l /d/a/modflow6/modflow6/modflow6/bin
+          echo "FILE:"
+          file /d/a/modflow6/modflow6/modflow6/bin/mf6.exe
+          echo "LDD1:"
+          ldd /d/a/modflow6/modflow6/modflow6/bin/mf6.exe
+          which mf6.exe
+          #mf6.exe
+          DYLD_LIBRARY_PATH=/d/a/modflow6/modflow6/modflow6/bin mf6.exe --version
+
+      - name: Update flopy
+        working-directory: modflow6/autotest
+        run: python update_flopy.py
+
+      - name: Get executables
+        working-directory: modflow6/autotest
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        run: pytest -v --durations 0 get_exes.py
+
+      - name: Test nc4 program
+        working-directory: modflow6/autotest
+        env:
+          REPOS_PATH: ${{ github.workspace }}
+        run: |
+          pytest -v test_gwf_chd01.py -s --keep temp
+          cat temp/test_mf6model[chd01]0/mfsim.lst | grep -i netcdf
+
+      - name: Test programs
+        working-directory: modflow6/autotest
+        env:
+          REPOS_PATH: ${{ github.workspace }}
+        run: |
+          branch="${{ github.ref_name }}"
+          marker="not large"
+          markers=$([ "$branch" == "master" ] && echo "$marker and not developmode" || echo "$marker")
+          pytest -v -n auto --durations 0 -m "$markers"
+