NWS Bismarck will begin issuing Frost/Freeze highlights May 13th

The National Weather Service office in Bismarck will begin issuing Frost Advisories, Freeze Watches, and Freeze Warnings for western and central North Dakota on Friday May 13th which is the start of the local growing season.
 
A Frost Advisory will be issued when the temperature is expected to be 33 to 36 degrees Fahrenheit over a geographically significant area during the next 24 hours, with favorable conditions for frost development. Some injury to sensitive vegetation is expected as a result of these conditions.
 
A Freeze Watch will be issued when the temperature is expected to be 32 degrees Fahrenheit or below, for longer than one hour, over a geographically significant area during the next 12 to 48 hours.

A Freeze Warning will be issued when the temperature is expected to be 32 degrees Fahrenheit or below, for longer than one hour, over a geographically significant area during the next 24 hours. Significant damage to vegetation is possible as a result of these conditions.

The graphic below from the Midwest Regional Climate Center shows the median date for the last 32°F Freeze, based on the 30 year climate record from 1980 - 2010. Most areas in western and central North Dakota fall in the May 11 - 20 period. However, parts of the southeast fall in the May 1 - 10 period, while some areas in the northwest fall in the May 21 - 31 period.



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