Freeze Warning issued September 20 at 4:32AM PDT until September 21 at 8:00AM PDT by NWS

...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... The National Weather Service in Medford has issued a Freeze Warning...which is in effect from 2 AM to 8 AM PDT Thursday. A Frost Advisory has also been issued. This Frost Advisory is in effect from 2 AM to 8 AM PDT Thursday.

from Current Watches, Warnings and Advisories for the United States Issued by the National Weather Service http://ift.tt/2wGxZ4J