... Frost advisory remains in effect from 10 PM this evening to
8 am PST Wednesday...
* temperatures... lowering to the upper 20s to low 30s by 6 am
Wednesday, the coldest spots may reach the mid 20s.
* Duration... several hours of temperatures sufficient for frost
tonight with 4 to 6 hours of near freezing conditions.
* Location... coldest in low-lying wind-sheltered areas.
* Impacts... near to sub-freezing temperatures can damage crops
and sensitive vegetation, and harm outdoor pets and livestock.
Extended exposure to cold can cause hypothermia.
A frost advisory means that widespread frost is expected.
Sensitive outdoor plants may be killed if left uncovered.
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San Diego County Inland Valleys Severe Watches & Warnings NOAA Weather Radio
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Issued: 4:36 PM PST Feb. 20, 2018 – National Weather Service