A look at the areal coverage of annual CONUS precipitation standardized anomly grid counts from +/-1 to +/-3 sigma since 1977. This year will be 2X the area of +3 sigma occurring in 1983. Also, a trend toward larger areas of highly anomalous precipitation shows up since 1990s. pic.twitter.com/33Blas9K1R

— Greg Carbin ☮️ (@GCarbin) December 16, 2018