Issued by NWS Baltimore MD/Washington DC at 1:50 PM on October 18.
What: Sub-freezing temperatures as low as 30 expected.
Where: In Maryland, Carroll and Frederick Counties. In Virginia, Culpeper, Fauquier, and Western Loudoun Counties.
When: From 1 AM to 9 AM EDT Monday.
Impacts: Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Additional Details: Expect the coldest temperatures in valleys and other low lying areas.
What to do
Take steps now to protect tender plants from the cold.
Source: National Weather Service. Alerts may be updated, extended or cancelled; see weather.gov for the latest.
Read the original article at the original source