The center of #Harvey is well-defined but consists of just a swirl of clouds, no t-storms. All of the extreme convection is over Houston – Dr. Ryan Maue via Twitter

Based on my not-fully-vetted record compilation, Harris County Flood Control District gauge #110 just broke the all-time record for greatest 3-day total at a regular reporting station in the United States (outside of Hawaii).  The August 26-28 total is 36.80”, with 4.5 hours and about 2” still to come.  The previous record is from 1997 at Dauphin Island, Alabama, 36.14”.  The record at any non-station remains 48” at Medina, Texas, August 1978, and the Hawaii regular reporting station record remains 48.75” at Honokane in 1942.

   Total rainfall in 20,000 sq mi area over 72 hours, expressed as multiples of the average daily discharge of the Mississippi River (call them Mississippi-days), top United States storms:

18.8 Harvey
14.8 Beulah 1967 TX/MX
13.9 1899 TX
13.2 Georges 1998 FL
12.6 1994 TX
12.6 Floyd, NC
12.0 1940 (May) LA
11.3 1940 (Nov) TX
10.1 2010 TN
9.7 Alberto 1994 GA