Hands-on Exercise Quantitative Precipitation Estimation
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1 Hands-on Exercise Quantitative Precipitation Estimation 8 February 2018 Takanori SAKANASHI Asia Pacific Severe Weather Center, Forecast Division, Forecast Department
2 Purpose of this hands-on training To understand the QPE algorithm, and the importance of observation data.
3 Contents Make QPE product using JMA observation data, and program for exercise.
4 Practice Tools QPE production tool Constant parameters Site list ( radar, rain-gauge) Tables Execute program, script ( windows batch) Not R/A itself. Verification worksheet ( Microsoft Excel)
5 Tool files Setting files Const folder qpe.ini, param_practice.ini timecard.txt Source, product data Data folder Execute program qpeexe.bat Verification tool Verification.xlsx
6 How to exercise Use qpeexe.bat to run QPE program Observation data source./data/raingauge/ is for rain-gauge../data/siteradardata/ is for radar. Output./Data/Composite/ is for QPE./Data/Verification/ is for CSV data to verify
7 Rain-gauge Data Please set rain-gauge data under the following directory. Filename is YYYYMMDDHH.txt Data format is Station ID Data
8 Radar data Every 10 minutes radar data. JMA s operational format data Not used elsewhere Site Code ( JMA Unique code) on file name Tokyo radar A3 Ex. RCAPA N302N.gz Sendai radar A5 Ex. RCAPA N302N.gz Shizuoka radar B5 Ex. RCAPB N302N.gz
9 Output First Estimation and Second Estimation is at./data/composite/ folder, and PNG is composite product. First Estimation Second Estimation
10 Case Typhoon case 2016 /8 /22 16:00 UTC Radar composite ( all site)
11 Observation Data Radar data Tokyo radar Sendai radar Shizuoka radar Rain-gauge Sendai radar Tokyo radar Shizuoka radar Radar composite ( all site)
12 Data Source Rain-gauge
13 As a truth Rain-gauge
14 Verification Verification.xlsx./Data/Verification/ Open Scatter.yyyyMMddHH.csv in Excel Set Filter
15 Uncheck -1, and 0 of rain-gauge and radar Paste data to Verification.xlsx
16 See verification result in plot Horizontal axis is rain-gauge Vertical axis is radar Radar Rain-gauge
17 Appendix
18 Visibility Sendai Altitude : 2km, 3km, 4km, Shizuoka Tokyo
19 Second Precipitation Estimation First Precipitation Estimation (E1) Rain-gauge Precipitation(R) Second Precipitation Estimation(E2) Calibrate again to express more smaller scale precipitation distribution. 1. Second Precipitation Estimation(E2) employ distribution of First Precipitation Estimation and rain-gauge observation. Precipitation distribution around rain-gauge should be expressed more clearly. 2. For E2, Second Calibration Factor(F2) is calculated with correcting First Calibration Factor(F1) which contains overall observation.
20 Second Precipitation Estimation First Precipitation Estimation (E1) Rain-gauge Precipitation(R) Second Precipitation Estimation(E2) Correction amount of First Calibration Factor Correction factor calculation 1. For rain-gauge grids Compare First Precipitation Estimation with precipitation observation by rain-gauge. 2. For all grids Weighed interpolation method referencing neighbor raingauge grids.
21 Second Precipitation Estimation Calculation of Correction Factor (C2) for rain-gauge grids Rain-gauge Precipitation (R) C 2 First Estimation (E 1 ) C2(i) = R(i)/E1(i) R(i) :Precipitation observed by rain-gauge #i E1(i):First Estimation at the grid of rain-gauge #i C2(i):Correction Factor at the grid of rain-gauge #i Rain-gauge grids *To be determined for all rain-gauge grids
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