A freeze warning is a warning issued by the National Weather Service when sub-freezing temperatures are expected in the next 36 hours. This can occur with or without

frost Frost is a thin layer of ice on a solid surface, which forms from water vapor in an above-freezing atmosphere coming in contact with a solid surface whose temperature is below freezing, and resulting in a phase change from water vapor (a gas) ...

. When a freeze warning is issued in the fall, that will usually signify the end of the

growing season A season is a division of the year marked by changes in weather, ecology, and the amount of daylight. The growing season is that portion of the year in which local conditions (i.e. rainfall, temperature, daylight) permit normal plant growth. Whil ...

, as sub-freezing temperatures will usually kill all remaining crops. Farmers and gardeners should take action to protect or harvest their

herbaceous plants Herbaceous plants are vascular plants that have no persistent woody stems above ground. This broad category of plants includes many perennials, and nearly all annuals and biennials. Definitions of "herb" and "herbaceous" The fourth edition of t ...

if a freeze warning is issued. A freeze warning is issued several hours after a freeze watch if a freeze continues to be expected.

Example

110
WWUS74 KMOB 081005
NPWMOB

URGENT - WEATHER MESSAGE
National Weather Service Mobile AL
405 AM CST Thu Mar 8 2018

...FREEZING TEMPERATURES EXPECTED ACROSS NORTHERN PORTIONS OF THE
AREA LATE TONIGHT INTO EARLY FRIDAY MORNING...

.Temperatures are expected to drop to near or just below freezing
across portions of interior southeast Mississippi and interior
southwest Alabama late tonight into early Friday morning. Areas of
frost will also be possible across the area during the same time
period.

ALZ051>058-MSZ067-081900-
/O.UPG.KMOB.FZ.A.0001.180309T0600Z-180309T1400Z/
/O.NEW.KMOB.FZ.W.0001.180309T0600Z-180309T1400Z/
Choctaw-Washington-Clarke-Wilcox-Monroe-Conecuh-Butler-Crenshaw-
Wayne-
Including the cities of Butler, Lisman, Silas, Chatom, Millry,
Grove Hill, Jackson, Thomasville, Camden, Pine Hill, Homewood,
Monroeville, Evergreen, Greenville, Brantley, Luverne,
and Waynesboro
405 AM CST Thu Mar 8 2018

...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM CST
FRIDAY...

The National Weather Service in Mobile has issued a Freeze
Warning, which is in effect from midnight tonight to 8 AM CST
Friday. The Freeze Watch is no longer in effect.

* TEMPERATURE...A range of 30 to 32 degrees is expected.

* IMPACTS...Temperatures at or below freezing, along with areas
  of frost, could kill sensitive plants and vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

References

External links

National Weather Service

Federal Emergency Management Agency
{{SevWea nav Weather warnings and advisories

Example

See also

References

External links