Warmer temperatures and partly sunny skies will make a brief appearance Wednesday in the metro-east.
But the weather will make a drastic change during the afternoon hours, according to the National Weather Service.
The high will reach 65 before thunderstorms start to move into the area after 4 p.m. After that, heavy rain, gusty winds up to 25 mph and plunging temperatures are expected.
The overnight low will drop to 42.
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There is a 20 percent chance of rain in the forecast for Thursday with the best chance of precipitation coming before 1 p.m. It will be much cooler with a high of 50 and an overnight low of 31.
The Friday forecast calls for sunny skies. But the downhill slide for the mercury continues. The high will be 44 with a low of 26.
The average high for late March in the St. Louis area is 60 degrees, meaning the high temperature Friday will be 16 degrees below normal.