Hi @benparkes , thanks for your message. Are you sure that the particular alert does meet all conditions – not only snow but also all other aspects that you activated for that alert? The criteria operator is "AND", which means that within a single alert ALL conditions must be met so that you receive an email alert.
See this instruction: https://blog.windy.com/email-alert
If you suspect you are not receiving alerts that do meet all conditions, please send us the ID of the alert(s) via info[at]windy.com and we will check it out.