frost warning 霜凍警告

frost warning
繁：霜凍警告
简：霜冻警告

清晨7時，天文台錄得市區溫度為8.2℃，濕度為52%。寒冷天氣警告、紅色火災危險警告以及霜凍警告同時生效。天文台提醒農友及有關人士，早上時間新界北部可能出現地面霜。

大帽山再跌破零度　霜凍警告生效　農田未見結霜（2018年2月5日）。香港 01，取自 https://www.hk01.com/article/156890

As the city continued to be gripped by a week-long cold spell, a second frost warning was issued on Sunday afternoon by the Hong Kong Observatory, which said ground frost was likely to occur early on Monday morning in the northern part of the New Territories.

Hong Kong Observatory issues second frost warning as cold snap continues. (2018, February 5). South China Morning Post. Retrieved from http://www.scmp.com/news/hong-kong/community/article/2131949/second-frost-warning-weekend-issued-hong-kong-observatory