351 AM CDT MON APR 9 2012 NWS Des Moines

…FREEZE WARNING IN EFFECT FROM 3 AM TO 9 AM CDT TUESDAY…

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FREEZE WARNING…WHICH IS IN EFFECT FROM 3 AM TO 9 AM CDT TUESDAY, FOR ALL COUNTIES ALONG AND NORTH OF HIGHWAY 30, PLUS AUDUBON-CASS–SHELBY- HARRISON- AND POTTAWATTAMIE COUNTIES IN SOUTHWEST IOWA.

THE FREEZE WATCH ISSUED SUNDAY AFTERNOON FOR THOSE COUNTIES, IS NO LONGER IN EFFECT.

TEMPERATURES WILL COOL SIGNIFICANTLY OVERNIGHT…DROPPING BELOW FREEZING BY EARLY TUESDAY MORNING. TEMPERATURES MAY REMAIN BELOW FREEZING FOR SEVERAL HOURS BEFORE QUICKLY WARMING AFTER SUNRISE TUESDAY. MOST AREAS WILL EXPERIENCE MORNING LOW TEMPERATURES IN THE MID TO UPPER 20S. THE COLDEST READINGS WILL BE GENERALLY ALONG AND NORTH OF HIGHWAY 30…AND IN LOW LYING AREAS ALONG THE NISHNABOTNA RIVER VALLEY. FROST MAY ACCOMPANY THESE COOL TEMPERATURES AS WELL.

YOUNG TENDER VEGETATION MAY BE KILLED OR DAMAGED BY THESE COOL TEMPERATURES AND FROST. a FREEZE WARNING MEANS SUB-FREEZING TEMPERATURES ARE IMMINENT OR HIGHLY LIKELY. THESE CONDITIONS WILL KILL CROPS AND OTHER SENSITIVE VEGETATION.

IN ADDITION, A FREEZE WATCH REMAINS IN EFFECT FROM LATE MONDAY NIGHT THROUGH EARLY TUESDAY MORNING, FOR THOSE COUNTIES SOUTH OF HIGHWAY 92, AND THOSE COUNTIES EAST OF CASS COUNTY, ALONG AND SOUTH OF INTERSTATE 80 (INCLUDING ADAIR, GUTHRIE, MADISON, & DALLAS).