I am interested in working with the Tornadoes data available in Geo-spatial data tag in Wolfram data collection. How can I find if the value in cell is missing and fill in a suitable value ( for example here in this can I want to fill a constant temporarily. ) You can find the data set here.
You could use ReplaceAll: yourdata /. _Missing -> 0 (or whatever constant instead of 0 you desire).
yourdata /. _Missing -> 0