It comes into effect from 6pm and will stay in place until 9am tomorrow. 

Any overnight mist or foggy patches are expected to lift later this morning.

Some were closed for up to four days after low temperature and ice warnings were in place.

The low temperature and ice alert starts at 7pm this evening and ends at 8am tomorrow morning.

Sub-zero temperatures have resulted in dozens of school and business closures across the region.

A new status orange low temperature and ice warning is in place until 11 o'clock tomorrow morning, for Longford, Leitrim and Roscommon.

Parts of the Shannonside region could see temperatures as low as minus 6 degrees tonight with an orange weather alert coming into effect from 6pm.

Dangerous travelling conditions are being reported with many rural roads and footpaths resembling ice rinks while freezing fog is lingering across the day.