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Dangerous Heat and Spotty Storms Mark Independence Day Weekend Across Much of the U.S.

Forecasters say a slow-moving heat dome has pushed heat-index values into the triple digits while a frontal system will likely increase rain and cool temperatures early next week.

A woman walks her dog through Alamo Square Park in San Francisco in June. It should be another lovely weekend in San Francisco and across the Bay Area.
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Overview

  • This Independence Day weekend many areas are enduring hot, humid conditions with heat-index values commonly at or above 100°F and some places reporting feels-like readings over 105°F.
  • An official Extreme Heat Warning continues for parts of the Susquehanna Valley through Saturday evening and Heat Advisories cover nearby counties, urging people to avoid prolonged outdoor exposure.
  • Scattered to isolated showers and thunderstorms are possible late Friday and Saturday evening but are expected to be highly spotty so most fireworks events should stay dry for now.
  • When storms do form they can bring heavy rain, frequent lightning, gusty or damaging winds and isolated hail, and meteorologists warn these cells can develop and move quickly.
  • Forecast models show a low-pressure/front system bringing broader showers and cooler, more seasonable temperatures Sunday into Monday while western deserts remain at risk of extreme 110°F-plus heat next week driven by a persistent heat dome and seasonal factors.