From the National Weather Service * WHAT… Sub-freezing temperatures as low as 28 expected. * WHERE… Portions of northeast Missouri, east central, northeast and southeast lowa and north central, northwest and west central Illinois. * WHEN… From 1 AM to 8 AM CDT Tuesday. * IMPACTS… Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS… Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly.