diff --git a/Makefile b/Makefile
index b6f17fd..74643fe 100644
--- a/Makefile
+++ b/Makefile
@@ -11,20 +11,25 @@ CURRENT_DIR = $(shell pwd)
 ###############################
 # Create python virtual environment
 
-. PHONY: venv_init
-
+.PHONY: venv-init
 venv-init: ##@environment Setup virtual environment
-	conda env create -f environment.yml --prefix=.venv python=3.7
+	conda env create -f environment.yml --prefix=.venv python=3.6
 
+.PHONY: venv-activate
 venv-activate: ##@environment Activates the virtual environment
 	activate $(CURRENT_DIR)/.venv
 
+.PHONY: venv-update
 venv-update: ##@environment Updates to latest packages
 	conda update ipykernel && conda update --prefix .venv --all
 
+.PHONY: venv-requirements-install
 venv-requirements-install: ##@environment Ensures environment.yml packages are installed
 	conda env update
 
+# The environment.yml file should really be created by hand, but
+# this provides a good starting point.
+.PHONY: venv-requirements-export
 venv-requirements-export: ##@environment Exports current environment to environment.yml
 	conda env export --file environment.yml
 
@@ -125,6 +130,17 @@ impacts: ./data/interim/impacts_forecasted_foreshore_slope_sto06.csv ./data/inte
 	--slope "mean" \
 	--output-file "./data/interim/twl_mean_slope_sto06.csv"
 
+./data/interim/twl_poststorm_mean_slope_sto06.csv: ./data/interim/waves.csv ./data/interim/tides.csv ./data/interim/profiles.csv ./data/interim/sites.csv ./data/interim/profile_features.csv
+	activate ./.venv && python ./src/cli.py create-twl-forecast \
+	--waves-csv "./data/interim/waves.csv" \
+	--tides-csv "./data/interim/tides.csv" \
+	--profiles-csv "./data/interim/profiles.csv" \
+	--profile-features-csv "./data/interim/profile_features.csv" \
+	--runup-function "sto06" \
+	--slope "mean" \
+	--profile-type "poststorm" \
+	--output-file "./data/interim/twl_poststorm_mean_slope_sto06.csv"
+
 ./data/interim/impacts_observed.csv: ./data/interim/profiles.csv ./data/interim/profile_features.csv
 	activate ./.venv && python ./src/cli.py create-observed-impacts \
 	--profiles-csv "./data/interim/profiles.csv" \
@@ -143,6 +159,12 @@ impacts: ./data/interim/impacts_forecasted_foreshore_slope_sto06.csv ./data/inte
 	--forecasted-twl-csv "./data/interim/twl_foreshore_slope_sto06.csv" \
 	--output-file "./data/interim/impacts_forecasted_foreshore_slope_sto06.csv"
 
+./data/interim/impacts_forecasted_poststorm_mean_slope_sto06.csv: ./data/interim/profile_features.csv ./data/interim/twl_foreshore_slope_sto06.csv
+	activate ./.venv && python ./src/cli.py create-forecasted-impacts \
+	--profile-features-csv "./data/interim/profile_features.csv" \
+	--forecasted-twl-csv "./data/interim/twl_poststorm_mean_slope_sto06.csv" \
+	--output-file "./data/interim/impacts_forecasted_poststorm_mean_slope_sto06.csv"
+
 
 ###############################
 # Misc commands