"Due to easterly gales, with orographic lift, there could be exceptionally high amounts of snow for eastern parts of Wicklow and indeed southern parts of Dublin.
"South Dublin is normally in a rain shadow but in this case with a north-easterly wind, it's the opposite effect.
"In fact we could get up to a metre of snow and this will have a huge knock-on effect over the next few days.
"We in Met Eireann are seriously worried about flooding, over eastern parts, in particular the greater Dublin area."
Dublin Bus, Irish Rail and Luas have all cancelled all services for tomorrow.
Ryanair and Aer Lingus have axed almost all Irish flights scheduled for Friday.
Taoiseach Leo Varadkar has warned "the risk to life and limb should not be underestimated".
All of Munster and Leinster will remain on red alert up to 12 noon tomorrow - but a red weather warning for Connacht, Cavan, Monaghan and Donegal will be lifted at the earlier time of 6am on Friday.
Weather chiefs updated the warnings just before 2pm today after putting the entire country on red alert late last night.
The snow-ice warning for Leinster and Munster takes in 18 counties - Carlow, Dublin, Kildare, Kilkenny, Laois, Longford, Louth, Meath, Offaly, Westmeath, Wexford, Wicklow, Clare, Cork, Kerry, Limerick, Tipperary and Waterford.
And Met Eireann say southern and eastern coastal counties will be worst affected.
The Government say Storm Emma is going to be "as bad as anticipated" as people are urged to stay at home until 3pm tomorrow.
Meanwhile, Galway, Mayo, Sligo, Roscommon, Leitrim, Cavan, Monaghan and Donegal are also on red alert from this afternoon.
From 2018:We're seeing some incredible movement on Earth of late:
The cracks and ground movement have already started in 2012 in the region, however, in recent weeks, the situation has become too dangerous, with villagers evacuating homes and seeking refuge in other settlements far away.
On March 2, 2018, a new landslide occurred around 3 am and caused the collapse of 37 homes, the health center of the city, a stretch of 300 meters of road and threatens to destroy a primary and secondary school. There are now at least 53 large cracks - due to earthquakes and heavy rains - destabilizing the ground in the region.
Hundreds of acres of crops were damaged on Sunday after hailstorm hit some 36 villages in Uttar Pradesh's Mathura district.
Tehsil teams have been sent to ascertain the loss and the report will be out today, officials said. "No casualty has been reported," additional district magistrate Ravindra Kumar said.
Bahujan Samaj Party legislator Shyam Sundar Sharma said hundred per cent loss was reported in Raypur, Manakpuri, Musumna, Khuslagarhi, Tilkagarhi, Khanpur, Managarhi, Bhagwangadhi and adjoining villages, where wheat and mustard crops were damaged.
Rameshwar, block pramukh of Nandgaon, said 15 villages in his region suffered damages due to the hailstorm.
Sub-divisional magistrate Chatta Rajendra Pensiya assured that teams have been sent to affected villages to ascertain the loss as well provide adequate help to those in distress. He said some birds were killed in the hailstorm.
Comment: See also: 'This is a crisis' - Unusually brutal winter doubles farmers' costs and endangers cattle in Montana