Hot weather to last through the Fourth of July

Jul 02, 2018, 02:55
Hot weather to last through the Fourth of July

Clear, warm, and sticky.

A heat wave is officially marked by three consecutive days of temperatures 90 degrees or above.

The unsafe heat and humidity can also affect people who are accustomed to working in the heat.

High temperatures Thursday in Philly are expected to top out at 89 degrees, but there is a chance a few locations across the region could hit 90.

Another hot and humid day expected today with highs once again in the 90s and heat index values above 100 degrees. Temperatures near - and above - 100 degrees Fahrenheit are combining with thick humidity to present serious health hazards. We're looking at a high of 95. Our all-time record high for today was 95°F set back in 1941.

The Weather Channel added that strong upper-level ridges of high pressures - or "heat domes" - contribute to the hot temperatures. By this afternoon, dew points inch up into the low 60s which makes the humidity a bit more of a factor. The records for both Friday and Saturday were 100° and Sunday's is 99°.

Philadelphia, which hit 92 degrees on Sunday with a heat index of 105, similarly sounded the alarm to its residents and visitors about the unsafe heat. This will take heat indices in to the upper 90°s. Hot temperatures will last into next week, and possibly right through Independence Day.

Given it's the first heat wave of the summer, it is important to remember and practice hot weather safety measures. If you must be outside during the late-morning/afternoon, stay out of the sun as much as possible, seek shade and drink plenty of water.

Heat illnesses are possible for those active outdoors or those susceptible to heat illnesses, such as children and the elderly. Hot weather, especially long duration heat waves, is surprisingly high on the list of most unsafe types of weather in terms of injuries or deaths each year. Expect dangerously hot temperatures Thursday through Saturday with peak heat index values between 100-105 degrees. Very high humidity will be sustained and even increased due to still wet soils from recent rains, evapotranspiration from a growing corn crop and a replenishing of already high dew-point air flowing into our area from the Plains and Mississippi Valley.

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