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Summer kicks off hot and humid
It's the first day of summer! The summer solstice begins with warm and humid conditions and chances for thunderstorms. Early morning temperatures were in the mid- to upper-70s across eastern Nebraska into central Iowa, with dew point temperatures in the 70s. Some minimum high temperature records may occur the next few days.
A low level southerly jet stream of warm, soupy air is feeding a squall line of thunderstorms dropping south into northern Iowa and southern Wisconsin out of Minnesota early this morning. Hot dry air remains to the west over the Plains. More thunderstorms are forecast tonight into early tomorrow morning as this sharp contrast of dry air meets the moist unstable air over northern Nebraska, eastern South Dakota, southern Minnesota, Wisconsin, and northern Iowa. Some of these storms may even develop into central Iowa overnight and later again on Sunday morning. High temperatures will climb into the upper 80s and low 90s over the weekend.
In the central and eastern Corn Belt states, morning temperatures were in the 70s and 60s this morning. Expect warm and humid conditions throughout the weekend with highs in the upper 80s to mid-90s and warm lows in upper 60s and 70s. Hazy weather is forecast during the day with scattered showers and thunderstorms overnight.
By Sunday night or early Monday, a weak cold front will start to move south across northern Illinois bringing an increasing chance of thunderstorms to the region. This frontal boundary will slowly shift southward next week bringing cooler daytime temperatures (in the 80s) to much of the region. Parts of central and southern Illinois may not feel much temperature and humidity relief from hot weather until late next week.
It does look like a cold front will slowly push into the southern Corn Belt at that time. This frontal boundary will help increase the chances of thunderstorm activity throughout the region into next weekend.
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