Sirens will begin “warbling” at 1:50 p.m. tomorrow from six city locations to signal the beginning of the first air raid under the present Civil Defense administration in Lycoming County. The test which will last until 1:57 p.m. comes as a highlight of “Pennsylvania Week.”

Glenn L. Sherman, head of the communications service in the Lycoming County Council of Civil Defense, said today, that the following have been scheduled to cooperate in sounding the alert and the all-clear signals.

The Naval Reserve Training Center, in the East End, City Hall, Williamsport Furniture Company, Williamsport Technical Institute, Bethlehem Steel Company, and in the West End, Armour Leather Company.

Civil Defense will also be keynoted by the Red Cross Bloodmobile which is scheduled for a visit to the Naval Reserve Center tomorrow. The Red Cross is cooperating with the Federal Civil Defense Administration in stockpiling plasmas for possible Civil Defense emergencies. This is in addition to the war demands upon this Bloodmobile program.

Business at the Post Office building will be brought to a halt during the alert period. Windows will be closed, and all services stopped. Postmaster J. Mark Good said.

Postal employees in the main floor will be sent to the basement of the building, except for several left on the main floor for protective purposes in the financial division and at the ramp at the rear of the building.

Mail carriers will take shelter at the nearest points on the routes and mail trucks will be halted. Drivers will remain in the trucks during the alert.

Office personnel on the second and third floors of the building and the persons in the offices will be moved to the halls of the building during the period of the alert.