Colleen McHugh Motivation On 29 July 2013 Philadelphia International Airport PHL recorded a record breaking daily rainfall total of 2037 mm The previous record was 1684 mm set on 16 September 1999 Hurricane Floyd ID: 602040
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Slide1
28-29 July 2013 Philadelphia Heavy Rainfall Event
Colleen
McHughSlide2
Motivation
On 29 July 2013, Philadelphia International Airport (PHL) recorded a record breaking daily rainfall total of 203.7 mm
The previous record was 168.4 mm set on 16 September 1999 (Hurricane Floyd)
Made July 2013 the second wettest month on record behind August 2011 (Hurricane Irene) and ahead of September 1999 Record occurred in the presence of a frontal passage and heavy rainfall embedded in slow moving thunderstorms, not a tropical cyclone186.7mm fell in a four hour period from 2000 UTC to 0000 UTCSlide3
Methodology
Synoptic conditions
Surface analysis plots from WPC
Archived radar from NCAR MMM shows the rain fell between 2000 UTC 28 July and 0600 UTC 29 JulyCFS reanalysisMesoscale conditionsSPC RAP archiveSoundings from University of WyomingStage IV Precipitation DataAnalyzed conditions from 1200 UTC 28 July to 0600 UTC 29 July 2013 Slide4
Key FindingsSlide5
Key FindingsSlide6
Conclusions
Constant southerly flow due to a surface cyclone over the Great Lakes and 500
hPa
heights that were -3.5 sigma850-300 hPa mean wind was also southerly PHL in a right entrance region of the jetHigh PWAT values transported into the region by the southerly flowModerate MUCAPE values helped initiate convection and constant southerly flow and IVT helped to add to training effect and record breaking rainfall