In Maryland, Anne Arundel, Howard, Prince George's Carroll, Charles, Baltimore and Montgomery Counties, and in Virginia Arlington, Falls Church, Alexandria and Fairfax are all under the warning until 8 p.m.
There may be scattered clouds this afternoon, but abundant sunshine will effectively add another 5 to 15-degrees to the heat indices, making conditions extremely unsafe.
The ridge of heat will gradually shift east by the second half of the week, which enable storm chances to increase slightly over the area. Some of the storms will be slow-movers bringing lots of rain to some towns while others nearby get nothing at all. Activity should diminish between 7-9 PM drying out for fireworks displays.
The most intense heat wave was in July of 1991 when we had 3 consecutive days of 100-degree heat! 5 down, 2 to go!
Temperatures will remain a bit cooler on Monday, with a high of 85 and a low of 65, according to a local meteorologist.
Bethany Beach will see some clouds on Tuesday, with highs reaching just 80 degrees.
Today: Partly Cloudy, Scattered Showers/Storms (30%). By the 4th of July temps will be down to 90 in NY and 93 in Philadelphia, Samuel said.
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The Centers for Disease Control and Prevention has specific recommendations for the symptoms of heat exhaustion and the even-more serious heat stroke.
Storms return early next week.
The heat wave in the Northeast will continue through the Fourth of July holiday, forecasters say. Chance for an isolated shower/storm in the afternoon. High near 88. Low around 67.
Looking ahead, the National Weather Service has issued an excessive heat watch Wednesday, to affect a seven-county area in Minnesota.
FRIDAY: Very humid with showers and storms developing. Lightning and thunder are also possible, but severe weather is not expected.
A heat dome, or an area of high pressure at high altitudes, is expected to cover most of the United States by the middle of the week, according to the Washington Post.