Full Notification

The National Weather Service in Baltimore MD/Washington has upgraded the Heat Advisory to an Excessive Heat Warning, which is in effect from 11 AM this morning to 9 PM EDT this evening. The Heat Advisory is no longer in effect.

* HEAT INDEX VALUES...Near 110 degrees today, then potentially 110 to 115 degrees Saturday and Sunday due to temperatures in the upper 90s to around 100 degrees and dewpoints in the lower to middle 70s.

* Impacts...Dangerously high temperatures and humidity could quickly cause heat stress or heat stroke if precautions are not taken.

* AFFECTED AREAS: DISTRICT OF COLUMBIA ... CARROLL ... EASTERN LOUDOUN ... ANNE ARUNDEL ... FAIRFAX ... ARLINGTON/FALLS CHURCH/ALEXANDRIA ... NORTHERN BALTIMORE ... PRINCE WILLIAM/MANASSAS/MANASSAS PARK ... PRINCE GEORGES ... NORTHWEST HOWARD ... NORTHWEST HARFORD ... CENTRAL AND SOUTHEAST HOWARD ... CENTRAL AND SOUTHEAST MONTGOMERY ... WESTERN LOUDOUN ... FREDERICK ... SOUTHEAST HARFORD ... NORTHWEST MONTGOMERY ... SOUTHERN BALTIMORE

Instructions:

An Excessive Heat Warning means that a prolonged period of dangerously high temperatures will occur. The combination of extreme temperatures and high humidity will create a dangerous situation in which heat illnesses are expected. Check in on relatives and neighbors. An Excessive Heat Watch means that a prolonged period of dangerously high temperatures is possible. Prepare for extreme temperatures and high humidity which would create a situation in which heat illnesses are expected. Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency - call 911.