It says there are 98 people in Altnagelvin Emergency Department (ED) and 53 at the South West Acute Hospital (SWAH) ED.
And 39 people are awaiting admission to Altnagelvin and 16 to SWAH
“This is an urgent appeal for staff to temporarily come and support their colleagues tonight and over the next number of days,” said the Western Trust in a statement on its Facebook and Twitter pages.
“We are extremely busy across our Emergency Departments and throughout our hospitals.
“Maintaining our bed capacity across all our hospital settings in Altnagelvin and South West Acute Hospital is crucial.
“And the ability to do so is dependent on creating a pool of available staff.
“We are looking in particular for Nurses (all bands) and Nursing and Care Assistants, Support Services staff and Housekeepers.
“If you feel you can offer some time to help please contact your Ward/Departments regarding any availability. Bank
“Staff should contact the banking office directly.”