The alerts act as warnings for those planning to be outside.
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In some cases they also allow for activation of emergency warming shelters for anyone in need.
The following counties have issued Code Blue alerts:
Philadelphia 7 p.m. Friday - 7 a.m. Sunday
Montgomery County, Pa. 8 p.m. Friday - 8 a.m. Saturday
Burlington County, N.J. 7 p.m. Friday - 7 a.m. Saturday
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Cumberland County, N.J. All day Friday - 6 a.m. Saturday
Check local websites for more details on Code Blue alerts in your area.
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