IEM Daily Feature
Wednesday, 03 October 2018

Many Heavy Rainfalls

Posted: 03 Oct 2018 05:42 AM

For Waterloo, September 2018 was the wettest month on record. October has started off very wet as well with over two inches reported on the first. For the year, the site is about 17 inches above average. Is that difference due to receiving many more significant rainfalls or just having many rain days? The featured chart addresses that question. Using the period of record data, the daily rainfall totals are binned into five equal contribution ranges. This year's totals are then placed in those bins. The percentage departure for precipitation amount is then shown by the red values with the number of days represented by the bars. The chart clearly shows that the reason the site is so far above average this year is due to the heaviest bin, daily values above 1.49 inches. There have been 11 such days so far versus an average of 2.7. Sadly, more days with heavy rainfall are expected over the coming seven days.

Good = 9
Bad = 1