NWS / NOAA weather: Extreme Heat Warning issued July 4 at 12:47AM EDT until July 4 at 9:00PM EDT by NWS Baltimore MD/Washington DC
* WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values 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...From 10 AM this morning to 9 PM EDT this 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...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 to
104 are possible again Sunday afternoon.
Source: NWS / NOAA weather.