Thursday starts mostly sunny and already muggy, with temperatures in the low 70s early and light wind. It will not stay quiet for long. Clouds build through the late morning, and by afternoon the chance for thunderstorms picks up. Expect a humid day with a high near 83. If you are out during the warmest part of the day, it may feel more like 92. Winds stay fairly light, generally around 5 to 10 mph.
Through the afternoon, rain chances run about 55%, with thunderstorms developing in spots. The bigger concern arrives this evening and overnight, when showers and heavier thunderstorms become much more likely. Rain chances climb to nearly certain levels tonight, and some storms could dump heavy rainfall in a short time. The low overnight will be around 69 as the humid air hangs on.
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A Flood Watch is in effect from 1 p.m. Thursday through Friday morning for the area, including Alton, because repeated rounds of thunderstorms could lead to flash flooding. If you live near a low-lying or flood-prone spot, keep an eye on conditions later today.
The allergy index is moderate today, with grass pollen the main allergen. Mold, ragweed and tree pollen are low.
Friday brings another unsettled day, with a high near 79 and a low around 70. Showers and thunderstorms remain likely, and some could again produce heavy rain.
Get the latest updates on weather conditions here: RiverBender.com/weather.
