* WHAT…For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 111. For the Heat Advisory, heat
index values up to 108 expected.
* WHERE…Portions of DC, central, north central, northeast,
northern, and southern Maryland, and central, northern, and
northwest Virginia.
* WHEN…For the Extreme Heat Warning, until 9 PM EDT this evening.
For the Heat Advisory, from 11 AM to 9 PM EDT Wednesday.
* IMPACTS…Heat related illnesses increase significantly during
extreme heat and high humidity events. Hot temperatures and high
humidity may cause heat illnesses.