A Multi-Radar, Multi-Sensor-based Hail Climatology for the CONUS: 2000-2011 Derek Rosseau, Kiel Ortega, Anthony Reinhart, and Holly Obermeier
OU/CIMMS & NOAA/OAR/NSSL
Introduction • ThisprojectusesdatafromMul4-YearReanalysisofRemotelySensedStorms(MYRORSS)
foryears2000-2011.• MYRORSSwasaprojectthatinvolvedreprocessingthearchiveofWSR-88Dlevel-IIdata
forthecon4guousUnitedStates• MYRORSSdatacombinesWSR-88DradardatawithRUC/RAPmodelanalysesand
producesMul4-RadarMul4-Sensor(MRMS)grids,suchasMaximumExpectedSizeofHail(MESH).
Quality Control (QC)
• Analyze daily accumulations of MESH. • Errors in reflectivity data result in erroneous MESH values. • The bad data were removed, if possible, then reprocessed the day. • Once a full year was reprocessed, the data was accumulated. • Accumulations ran through a series of smoothers to clean up the field.
Results
Issues Future Work
• Persistent QC problems (e.g. coastal interaction, radar spikes) affect the hail days per year climatology • Cannot manually remove some errors due to other precipitation in the area
IncorrectMESHvaluesduetocoastalinterac4onleadtonoiseintheclimatology
ThisposterwaspreparedbyDerekRosseauwithfundingprovidedbyNOAA/OfficeofOceanicandAtmosphericResearchunderNOAA-UniversityofOklahomaCoopera4veAgreement#NA11OAR4320072,U.S.DepartmentofCommerce.Thestatements,findings,conclusions,andrecommenda4onsarethoseoftheauthor(s)anddonotnecessarilyreflecttheviewsofNOAAortheU.S.DepartmentofCommerce.
12yearAccumula4onMaximumMESH(unsmoothed)
12yearAccumula4onMaximumMESH(smoothed)
DaysperYearAnyHail
DaysperYearSevereHail
JanuaryAnyHail FebruaryAnyHail MarchAnyHail AprilAnyHail MayAnyHail JuneAnyHail
JulyAnyHail AugustAnyHail SeptemberAnyHail OctoberAnyHail NovemberAnyHail DecemberAnyHail
Radarspikesduetoterrain:anothercommonQCissue
• Explorevariabilityofhailes4matespergivennear-stormenvironment
• Developaclimatologythates4matesthelikelihoodofseverehailusingcoarsergridspacing
• CompareMESHtootherMRMSgridstoseeifanymajordifferencesinaradar-derivedhailclimatologyexistbetweenproducts
• RawMESHfieldswereaccumulatedwithamul4plehypothesistechnique.Accumula4onsweresmoothedusingmul4pledila4onanderosionfilters,preservingsmallertrackswhileelimina4ngnoise,andfinishedwithaGaussianfilter.