Jefferson Lab to Conduct Test of its Tornado Warning Siren at 10:30 a.m. on Friday

NEWPORT NEWS, Va. – The Thomas Jefferson National Accelerator Facility will conduct a of test its tornado warning siren at 10:30 a.m. on Friday, Sept. 6. Depending on weather conditions at the time of the test, the siren could be heard by anyone within a 1.5-mile radius of the lab.

The test will be carried out over a period that could last from 30 seconds to three minutes. The test will be of the wavering tone (also called high-low-high or 10-4-10).

Jefferson Lab uses the siren to quickly alert members of the lab community who are working outdoors to "take cover" in the event of tornadoes and tornado warnings in the immediate vicinity of the lab.

Questions about Jefferson Lab's tornado siren may be directed to its Public Affairs office at

Contact: Deb Magaldi, Jefferson Lab Public Affairs, 757-269-5102,


Jefferson Science Associates, LLC, a joint venture of the Southeastern Universities Research Association, Inc. and PAE Applied Technologies, manages and operates the Thomas Jefferson National Accelerator Facility, or Jefferson Lab, for the U.S. Department of Energy's Office of Science.DOE’s Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, visit