[1] On April 29, 1986, he was the first base umpire when Roger Clemens of the Boston Red Sox achieved a record 20 strikeouts against the Seattle Mariners.

[2] Welke ejected Atlanta Braves manager Bobby Cox from game six of the 1996 World Series.

In a May 2, 2012 game between the Los Angeles Dodgers and Colorado Rockies at Coors Field, Welke made a controversial out call at first base against Jerry Hairston Jr. though first baseman Todd Helton's foot came well off the bag.

[4] In a September 16, 2014 game between the Washington Nationals and Atlanta Braves at Turner Field, immediately following an Ian Desmond two-run homer, Bryce Harper came up to bat.

Upon hearing what the fan said, Welke took off his mask and ordered a nearby usher to remove the heckler from the ballpark.

Harper struck out during the same at bat, but that did not stop the Nationals from clinching the NL East with a 3–0 win over the Braves.