NWS / NOAA weather: Extreme Heat Warning issued July 3 at 9:41AM EDT until July 4 at 9:00PM EDT by NWS Baltimore MD/Washington DC

* WHAT...Dangerously hot conditions each afternoon with heat index
values between 110 to 115 expected.

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

* WHEN...For the first Extreme Heat Warning, until 9 PM EDT this
evening. For the second Extreme Heat Warning, from 10 AM to 9 PM
EDT Saturday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.

* ADDITIONAL DETAILS...Early morning low temperatures in the 70s and
80s combined with oppressive humidity will result in little to no
overnight relief. Prolonged excessive heat may impact power,
water, and transportation systems. Heat index values around 100
are possible again Sunday afternoon.

Source: NWS / NOAA weather.