Heat Advisory issued July 1 at 10:27AM EDT until July 1 at 8:00PM EDT by NWS Baltimore MD/Washington DC

* WHAT...
For the Heat Advisory, heat index values up to 108 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 112 possible.

* WHERE...
Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia.

* WHEN...
For the Heat Advisory, until 8 PM EDT this evening. For the Extreme Heat Watch, from Thursday morning through Friday evening.

* IMPACTS...
Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.

* ADDITIONAL DETAILS...
Dangerous heat may linger into Saturday.
Prolonged extreme heat could impact power, water, and transportation systems.

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