For example, onshore synoptic flow favors the sea breeze, while offshore synoptic flow impedes the sea breeze. The opposite is true for the land breeze. This cold front is referred to as the sea breeze front during the day and appears over land. Overnight, the cold front is referred to as the land breeze front and appears over water. The sea breeze usually penetrates inland about 25 miles without onshore synoptic flow, but can reach miles inland with onshore synoptic flow.