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 >

Areas of Fog into Early This Morning

Dangerous Heat Continues Into Monday

Heat Index Forecast Through Monday Evening

Thunderstorm Chances This Afternoon/Tonight

Heat Safety Tips

Areas of fog have developed across portions of eastern Iowa and northwest Illinois due to light winds and very humid conditions. The fog could become locally dense with visibilities down to a quarter mile at times. If traveling, make sure to slow down and keep plenty of stopping distance in front of you.

Heat and humidity sticks around this afternoon and into Monday with peak heat indices between 100-110 degrees expected areawide with areas of 110+ possible! Extreme Heat Warnings and Heat Advisories remain in effect through Monday evening.

Here is the latest hourly heat index forecast through Monday evening (7/27).

Low coverage showers and storms are possible this afternoon (5-15%), with slightly higher chances overnight (15-50%). Confidence remains low on areal coverage, but with such an unstable air mass in place, a few storms could be strong to severe, especially in/near northwest Illinois. The primary concerns are localized damaging winds, frequent lightning, and heavy downpours.

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.

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

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