THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 21 IN EFFECT UNTIL 6 AM CST SATURDAY FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 6 COUNTIES IN SOUTHWEST ILLINOIS CALHOUN JERSEY MADISON MONROE RANDOLPH SAINT CLAIR IN MISSOURI THIS WATCH INCLUDES 18 COUNTIES IN CENTRAL MISSOURI AUDRAIN BOONE CALLAWAY OSAGE IN EAST CENTRAL MISSOURI CRAWFORD FRANKLIN GASCONADE JEFFERSON LINCOLN MONTGOMERY SAINT CHARLES SAINT LOUIS SAINT LOUIS CITY WARREN WASHINGTON IN NORTHEAST MISSOURI PIKE IN SOUTHEAST MISSOURI SAINT FRANCOIS SAINTE GENEVIEVE THIS INCLUDES THE CITIES OF ALTON, BELLEVILLE, BOWLING GREEN, CAHOKIA, CHESTER, COLUMBIA, EDWARDSVILLE, FARMINGTON, FULTON, MEXICO, SAINT CHARLES, SAINT LOUIS, SPARTA, SULLIVAN, UNION, AND WASHINGTON.