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UPDATE:

Heat advisory remains in effect until 10 pm edt Thursday, June 21
 
* heat index values...100 to 105 degrees today and around 105 degrees Thursday. Overnight heat index remaining above 80 degrees in the suburbs and near 90 degrees in the urban centers.
 
* Temperatures...high temperatures today and Thursday in the upper 90s to around 100. Low temperatures tonight in the mid-70s and lower 80s.
 
* impact...those outdoors for an extended period of time as well as those particularly sensitive to the heat will be at risk for heat exhaustion and other heat-related illness.
 
A heat advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check in on relatives and neighbors. 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 9 1 1.

 The national weather service in Baltimore md/Washington has issued a heat advisory...which is in effect from noon to 8 pm edt today.

* Heat index values...between 100 and 105.

* Temperatures...middle and upper 90s.

* impact...those outdoors for an extended period of time as well
  as those particularly sensitive to the heat will be at risk for
  heat exhaustion and other heat-related illness.

Precautionary/preparedness actions...

A heat advisory means that a period of hot temperatures
is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check in on relatives and neighbors.

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.
Heat stroke is an emergency - call 9 1 1.