EXCESSIVE HEAT WARNING until 7pm Sunday for the following counties: Cass, Champaign, Christian, Clark, Coles, Cumberland, De Witt, Douglas, Edgar, Effingham, Fayette, Greene, Logan, Macon, Macoupin, Mason, Menard, Montgomer, Morgan, Moultrie, Piatt, Sangamon, Scott, Shelby, and Vermilion. Heat indices Sunday will be near 110°. Prolonged exposure to the extreme heat and humidity may lead to illness.
HEAT RELIEF IS IN SIGHT.
Springfield (WICS) - Outdoor conditions continue to be unbearable during the noon to 7pm time frame as heat index values have easily been around 105° today. Temperatures are in the low 90s and dew points mid to upper 70s. This is a direct result of being underneath the Heat Dome, or large high pressure ridge which has dominated a significant portion of the U.S. this weekend. Underneath the dome, little in the way of showers and storms will be possible and that includes central Illinois through tonight. A disturbance in southern Wisconsin and northern Illinois will have a high likelihood for thunderstorms and severe weather as this activity is found and the edge of the Heat Dome. Worse case scenario, an isolated storms will be found as far south of I-74 before midnight.
Sunday's weather will be nearly identical with heat indices above 100° by noon, and up to 110° at times. A cold front approaching from the west will moving into Illinois late Sunday as the Heat Dome flattens and weaken just enough. Thunderstorm activity will be likely after 6pm Sunday, but the western extent of thunderstorm coverage is still a little unclear. So a 50/50 chance of storms is likely due to the cold front passage in central Illinois with a more likely chance in eastern Illinois. A MARGINAL RISK for severe weather is the current risk for all of our viewing area with gusty winds the main risk.
The cold front passes early Monday morning, but stalls in southern Illinois, so thunderstorms along or south of I-70 are possible in the morning hours. Otherwise more typical summer likely conditions will be felt with highs in the upper 80s and dew points in the low 70s. This will be far from the dangerous heat we've experience the past several days. Tuesday's weather is similar without the mention of any rain chances.
The rest of the forecast becomes unsettled, but still typical of summer time. Highs each day will be in the mid 80s Wednesday through Saturday with daily chances for rain and storms. Thursday looks like the next best chances as of now, but we'll continue to monitor model trends and bring more details as these events get closer.
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THE 7-DAY TEMPERATURE OUTLOOK: Look for highs in the mid 90s Sunday; upper 80s Monday and Tuesday, and mid 80s Wednesday through Saturday. Overnight lows will fall to the mid 70s Saturday and Sunday night; upper 60s Monday and Tuesday night; low 70s Wednesday night; upper 60s Thursday night; and mid 60s Friday night.
Thomas Patrick - Storm Team 20 Meteorologist
Today's Record Temperatures