National Weather Service United States Department of Commerce

Heat Across the Center of the Nation; Severe Thunderstorms Across the Great Lakes and Ohio Valley

Heat expands across the Desert Southwest, Plains, Mississippi Valley and Midwest into Monday. Fire weather concerns continue for portions of the Intermountain West. Active monsoonal moisture fuels thunderstorms over the Southwest with possible flash flooding. Tropical cyclone Fausto in the Pacific, should weaken as it approaches Hawaii; Dangerous surf, swells and rip currents are expected. Read More >

Dew points across the area are already in the mid-70s to low 80s, and despite areas of cloud cover, it will feel very humid to oppressive area-wide through this evening and potentially into Monday as well!
Heat and humidity continues to build with peak heat indices between 105-110 degrees expected today and Monday for much of the outlook area! Extreme Heat Warnings and Heat Advisories are in effect today, and there is an area-wide Extreme Heat Watch for Monday.
Low coverage showers and storms are possible today, with slightly higher chances overnight (20 - 40%). Confidence remains low on areal coverage, but with an unstable air mass in place a few of the storms could be strong to severe. The primary concerns are localized damaging winds, frequent lightning, and heavy downpours.
Here is the latest Heat Index forecast and trends through Monday (7/27).
With humid conditions once again in the forecast, please remember to practice heat safety tomorrow and Monday! If outside, drink plenty of water and take frequent breaks in the shade.