Introduction
In this document I will explore how to create the first part of the evaluation system I proposed. The working title of this is the “Forecast-Hour Evaluation.” The idea here is that we are looking at the performance of the model by looking at how it performed with different start times (using the most recent 00-hr forecast as input).
## Warning in rgl.init(initValue, onlyNULL): RGL: unable to open X11 display## Warning: 'rgl.init' failed, running with 'rgl.useNULL = TRUE'.Read Model and Observation Data
Read WRF Data
For this evaluation system we need to look at three different output folders. Here we use the folders named, forecast_day_minus_0, forecast_day_minus_1, forecast_day_minus_2. The contents of each of these folders will be similar: wrfout files for 86 forecast hours and time-series data for different locations of interest. Here we will first read the forecast data.
Read the OBS Data
Now we will read the observation data from the ASOS stations. The script that downloads the data is in ./obs_station_day_minus_0/dl_ny_asos.py. The lines for the dates to download need to be changed before running it. Once the files are download, the lines below reads the data and adds column names.
Unit Conversion
Model and observation data do not share the same units for the same variable. For temperature, WRF is in Kelvin and ASOS is in degreesF. For winds, WRF is in m/s and ASOS is in knots. The formulas used to convert the numbers to a common system is shown here. For temperature I will use Kelvin, and m/s for wind speeds.
Combined Data Frames
Now we have one data frame for all the observations, and three (3) data frames of the WRF data (one data frame per forecast init time). The lines below provide a visual of the data frames.
## Date.Time year mon day hour min sec Temperature Mixing.Ratio
## 1 2020-05-14 00:00:05 2020 5 14 0 0 5.0004 283.5710 0.00663
## 2 2020-05-14 00:00:10 2020 5 14 0 0 10.0008 283.7147 0.00663
## 3 2020-05-14 00:00:15 2020 5 14 0 0 15.0012 283.8395 0.00663
## 4 2020-05-14 00:00:20 2020 5 14 0 0 20.0016 283.9507 0.00663
## 5 2020-05-14 00:00:24 2020 5 14 0 0 24.9984 284.0515 0.00664
## 6 2020-05-14 00:00:29 2020 5 14 0 0 29.9988 284.1440 0.00664
## U_WIND V_WIND Wind.Speed Wind.Direction Station
## 1 -0.21702 4.49034 4.495581 177.2330 JFK
## 2 -0.25730 4.26258 4.270339 176.5457 JFK
## 3 -0.28874 4.09738 4.107541 175.9691 JFK
## 4 -0.31095 3.95381 3.966019 175.5032 JFK
## 5 -0.32786 3.83933 3.853303 175.1191 JFK
## 6 -0.33654 3.73945 3.754563 174.8574 JFK## Date.Time year mon day hour min sec Temperature Mixing.Ratio
## 1 2020-05-13 00:00:05 2020 5 13 0 0 5.0004 285.7411 0.00392
## 2 2020-05-13 00:00:10 2020 5 13 0 0 10.0008 285.8155 0.00392
## 3 2020-05-13 00:00:15 2020 5 13 0 0 15.0012 285.8827 0.00392
## 4 2020-05-13 00:00:20 2020 5 13 0 0 20.0016 285.9429 0.00392
## 5 2020-05-13 00:00:24 2020 5 13 0 0 24.9984 285.9981 0.00392
## 6 2020-05-13 00:00:29 2020 5 13 0 0 29.9988 286.0501 0.00393
## U_WIND V_WIND Wind.Speed Wind.Direction Station
## 1 2.82657 -2.56698 3.818231 312.2445 JFK
## 2 2.78120 -2.50359 3.742063 311.9930 JFK
## 3 2.74043 -2.43561 3.666354 311.6297 JFK
## 4 2.70147 -2.38634 3.604519 311.4557 JFK
## 5 2.65996 -2.34432 3.545592 311.3909 JFK
## 6 2.61993 -2.29520 3.483099 311.2201 JFK## Date.Time year mon day hour min sec Temperature Mixing.Ratio
## 1 2020-05-12 00:00:05 2020 5 12 0 0 5.0004 284.4861 0.00540
## 2 2020-05-12 00:00:10 2020 5 12 0 0 10.0008 284.6521 0.00540
## 3 2020-05-12 00:00:15 2020 5 12 0 0 15.0012 284.7949 0.00540
## 4 2020-05-12 00:00:20 2020 5 12 0 0 20.0016 284.9193 0.00540
## 5 2020-05-12 00:00:24 2020 5 12 0 0 24.9984 285.0302 0.00541
## 6 2020-05-12 00:00:29 2020 5 12 0 0 29.9988 285.1306 0.00541
## U_WIND V_WIND Wind.Speed Wind.Direction Station
## 1 6.50246 -1.04592 6.586041 279.1378 JFK
## 2 6.30699 -1.01466 6.388087 279.1394 JFK
## 3 6.14529 -0.98820 6.224237 279.1353 JFK
## 4 6.00212 -0.96661 6.079456 279.1486 JFK
## 5 5.86643 -0.94247 5.941654 279.1269 JFK
## 6 5.74277 -0.91471 5.815161 279.0501 JFK## Station Date.Time Temperature Relative.Humidity Wind.Direction
## 1 JFK 2020-05-13 00:00:00 NaN NaN 320
## 2 JFK 2020-05-13 00:05:00 NaN NaN 330
## 3 JFK 2020-05-13 00:10:00 NaN NaN 320
## 4 JFK 2020-05-13 00:15:00 NaN NaN 320
## 5 JFK 2020-05-13 00:20:00 NaN NaN 320
## 6 JFK 2020-05-13 00:25:00 NaN NaN 310
## Wind.Speed year mon day hour min sec
## 1 7.201646 2020 5 13 0 0 0
## 2 6.687243 2020 5 13 0 5 0
## 3 5.658436 2020 5 13 0 10 0
## 4 5.658436 2020 5 13 0 15 0
## 5 5.658436 2020 5 13 0 20 0
## 6 5.658436 2020 5 13 0 25 0Locations for Plots
Match Times for Model and Observations
Select Day of Interest
Time-matching is performed using a routine that can be found in Analysis01-Time_Matching_Problem.Rmd. The time matching will be done per variable. For the Forecast-Hour Evaluation product, we will focus on the temperature, wind speed and wind direction variables. Also, now that we have read all the TS data and ASOS data, we need to extract the day of interest, or doi for the time-series.
Note that for this product the “day of interest” will always be the UTC date of the day before.
We now have filtered data frames for the observations and model data for the day of interest.
Next, we will select only the temperature data for comparing the model and observations. This needs to be done on a per station basis. Note that we use the function drop_na() to drop rows which contain NaN or NA data. Since each variable is measured at different intervals, not all variables will have data available at every time step in the ASOS data. The functions may be too sensitive to missing data and thus we take care to remvove it here from the observations, after we have isolated a particular variable.
Temperature Time-Matching
Location: JFK
Location: LGA
Location: NYC
Wind Speed Time-Matching
Location: JFK
Location: LGA
Location: NYC
Wind Direction Time-Matching
Location: JFK
Location: LGA
Location: NYC
Forecast Hour Evaluation for JFK
For the temperature data I will use Bias, RMSE and MAE for the comparison statistics
| Forecast.Init | BIAS | RMSE | MAE | |
| 1 | WRF D-0 | 1.171 | 1.847 | 1.452 |
| 2 | WRF D-1 | 0.002 | 1.327 | 1.116 |
| 3 | WRF D-2 | -0.035 | 2.261 | 2.011 |
| Forecast.Init | BIAS | RMSE | MAE | |
| 1 | WRF D-0 | -0.778 | 1.457 | 1.154 |
| 2 | WRF D-1 | -0.563 | 1.771 | 1.411 |
| 3 | WRF D-2 | -0.278 | 1.782 | 1.323 |
| Forecast.Init | RMSE | MAE | |
| 1 | WRF D-0 | 52.427 | 32.619 |
| 2 | WRF D-1 | 66.379 | 48.641 |
| 3 | WRF D-2 | 79.558 | 62.772 |
Forecast Hour Evaluation for LGA
| Forecast.Init | BIAS | RMSE | MAE | |
| 1 | WRF D-0 | 0.041 | 1.017 | 0.823 |
| 2 | WRF D-1 | -0.758 | 1.176 | 1.007 |
| 3 | WRF D-2 | -1.486 | 2.147 | 1.577 |
| Forecast.Init | BIAS | RMSE | MAE | |
| 1 | WRF D-0 | -1.583 | 2.061 | 1.730 |
| 2 | WRF D-1 | -1.218 | 1.889 | 1.616 |
| 3 | WRF D-2 | -1.177 | 1.822 | 1.529 |
| Forecast.Init | RMSE | MAE | |
| 1 | WRF D-0 | 56.875 | 36.699 |
| 2 | WRF D-1 | 79.066 | 56.197 |
| 3 | WRF D-2 | 85.185 | 60.313 |
Forecast Hour Evaluation for NYC
| Forecast.Init | BIAS | RMSE | MAE | |
| 1 | WRF D-0 | 0.877 | 1.549 | 1.434 |
| 2 | WRF D-1 | -0.037 | 0.791 | 0.658 |
| 3 | WRF D-2 | -0.868 | 1.484 | 1.139 |
| Forecast.Init | BIAS | RMSE | MAE | |
| 1 | WRF D-0 | -0.554 | 1.102 | 0.921 |
| 2 | WRF D-1 | -0.501 | 1.070 | 0.897 |
| 3 | WRF D-2 | -0.470 | 1.040 | 0.878 |
| Forecast.Init | RMSE | MAE | |
| 1 | WRF D-0 | 49.938 | 39.738 |
| 2 | WRF D-1 | 88.018 | 67.906 |
| 3 | WRF D-2 | 75.908 | 53.342 |
uWRF and ASOS Time-Series Visualization
Temperature
## Warning: Removed 51 rows containing missing values (geom_point).## Warning: Removed 10 rows containing missing values (geom_path).
Wind Speed
Wind Direction
