...
2. Description of the event
We are missing precipitation observations from Sri Lanka.The observations below are instead from ogimet.com with the first plot valid on 20 May (20May 00z- 21 May 00z) and last 31 May. The worst precipitation episode in south-eastern Sri Lanka took place on 24-26 May with 535 mm at one station.
28 May missing
The plots below show the precipitation from HRES during the first 24 hours, as a proxy for the analysis. It is apparent that the short forecasts missed the events between 24-26 May, while it had heavy precipitation on 29-30 May, which seems to have been higher than observed.
3. Predictability
3.1 Data assimilation
...