Misspellings in weatherCodes

[joeledvina]

I found two spelling errors in the weatherCodes data:

For pwc code 12, "distant lightening" should be "distant lightning".

For pwc code 26, "thunderstorms (with or without precipiatation)" should be "thunderstorms (with or without precipitation)"

I was led to investigate because the table I was producting and styling with kable has several instances of "distant lightening". I scanned the rest of the entries and did not see any other misspellings.

Cheers, Joe