A HARD FREEZE EXPECTED FOR MUCH OF CENTRAL IOWA. A LARGE AREA OF HIGH PRESSURE WILL BECOME CENTERED ACROSSIOWA TONIGHT…WITH CLEAR SKIES AND LIGHT WINDS EXPECTED. THIS COMBINED WITH A CHILLY AIRMASS IN PLACE…WILL ALLOW TEMPERATURES ACROSS MUCH OF CENTRALIOWA TO FALL TO NEAR FREEZING OR BELOW BY SUNRISE SATURDAY.

Counties in dark blue are under a Freeze Warning; Light blue=Frost Advisory.

A FREEZE WARNING IS IN EFFECT FROM 1-AM UNTIL 9-AM SATURDAY FOR THE FOLLOWING AREA COUNTIES: SAC-CRAWFORD-CARROLL-AUDUBON-GUTHRIE-DALLAS-CASS-POTTAWATTAMIE-MILLS-MONTGOMERY-HARRISON AND SHELBY.

TEMPERATURES WILL FALL INTO THE MID 20S TO LOW 30S FOR SEVERAL HOURS OVERNIGHT.  A FREEZE WARNING MEANS SUB-FREEZING TEMPERATURES ARE IMMINENT OR HIGHLY LIKELY. THESE CONDITIONS WILL KILL CROPS AND OTHER SENSITIVE VEGETATION.