Arlington County will be under a Heat Advisory on Wednesday afternoon and an Excessive Heat Watch for Thursday afternoon.
The National Weather Service said today that high temperatures and humidity will reach dangerous levels as the week goes on. Heat index values of 105-110 degrees are possible on Thursday.
Friday is expected to be nearly as hot, but no heat advisories have been issued yet for that day. The area will cool to more moderate summer temperatures this weekend.
More on the heat advisory and watch from NWS:
…HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM EDT WEDNESDAY…
…EXCESSIVE HEAT WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH
THURSDAY EVENING…* WHAT…For the Heat Advisory, heat index values will range from around 100 degrees west of Interstate 95 to around 105 degrees near and east of Interstate 95. For the Excessive Heat Watch, dangerously hot conditions are possible with heat indices possibly ranging from around 105 degrees west of Interstate 95 to around 110 degrees near and east of Interstate 95.
* WHERE…The Washington, Baltimore, and Fredericksburg areas, central and southern Maryland, northern Virginia, and the eastern panhandle of West Virginia.
* WHEN…For the Heat Advisory, from noon to 8 PM EDT Wednesday. For the Excessive Heat Watch, from Thursday afternoon through early Thursday evening.
* IMPACTS…Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities.
PRECAUTIONARY/PREPAREDNESS ACTIONS…
Monitor the latest forecasts and warnings for updates on this situation. Be prepared to drink plenty of fluids, stay in an air- conditioned room, stay out of the sun, and check up on relatives and neighbors.
Young children and pets should never be left unattended in vehicles under any circumstances. This is especially true during warm or hot weather when car interiors can reach lethal temperatures in a matter of minutes.
Excessive Heat Watch is in place for areas mostly East of Blue Ridge for Thursday 12PM through 8PM. Heat Index to reach between 105 west of I-95, and 110 near and east of I-95. Stay hydrated out there! #vawx #mdwx #dcwx #wvwx pic.twitter.com/qkFXx41cof
— Washingtonian Weather Geeks (@WashingtonianWx) August 10, 2021