Heat index values around the Washington region at 1:10 p.m. Tuesday. (National Weather Service) (This post, originally published at 1:49 p
m, was updated at 2:30 p.m. to add information about the excessive heat warning placed into effect
) * Excessive heat warning through 8 p.m. * The National Weather Service has issued an excessive heat warning for the Washington and Baltimore regions through 8 p
m. Tuesday, the most severe heat alert. "The combination of extreme temperatures and high humidity will create a dangerous situation in which heat illnesses are expected," the Weather Service said
At 1:10 p.m., the air temperature in Washington soared to 97 degrees while the dew point, an indicator of humidity, stood at 75 degrees
That combination produced a stifling heat index, or measure of how hot the air feels, of 110 degrees
The Weather Service issues a heat warning when heat index values reach 110 or are predicted to rise that high
Area under excessive heat warning through 8 p.m. (National Weather Service) Both the air temperature of 97 and the heat index of 110 early Tuesday afternoon marked the highest levels of the summer of 2018 so far
The Weather Service advised checking in on relatives and neighbors. Older adults and anyone without access to air-conditioning are most vulnerable to heat-related illness
"Take extra precautions if you work or spend time outside," it said. "When possible, reschedule strenuous activities to early morning or evening
Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water
" Tuesday has produced the week's most extreme heat and humidity despite earlier forecasts which called for Sunday and Monday to be the hottest days of this heat wave
On Sunday, the high temperature was 93 with peak heat index values in the low 100s
Monday hit 95 with a heat index as high as 107. Tuesday marked the fifth straight day with highs of at least 90 degrees
The heat in Washington started early in the day Tuesday. The morning's low temperature only fell to 80 degrees which, if it stands, will mark a record high low temperature for the date, passing the previous mark of 79 from 1898 and 2002
By 10 a.m., the temperature in Washington was the highest in the nation on Weather
com's map: It's unlikely, however, that Washington will set a record high maximum temperature
The record high of 101, last set in 1966 (and before that in 1873 and 1872), should not be reached
Nonetheless, the heat and humidity have generated plenty of griping among Washingtonians
"D.C. is a hellscape, and I am not referring to the politics," tweeted Naomi Eide
"Every day I think it's going to be the hottest day, then the next day is worse," tweeted Nancy Duley
Wednesday, July 4, should actually show some improvement as the wind flow comes off the ocean, capping highs to around 90, though it will remain quite humid
Heat index values should still come close to 100.
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