David Ruth Meteorological Development Laboratory National Weather Service, NOAA. Measuring Forecast Continuity
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1 David Ruth Meteorological Development Laboratory National Weather Service, NOAA Measuring Forecast Continuity
2 National Digital Forecast Database (NDFD) Contains a seamless mosaic of NWS digital forecasts Is available to all users and partners public and private Allows users and partners to create wide range of text, graphic, and image products Measuring Forecast Continuity 2
3 NDFD Elements MaxT, MinT Weather, Wind, Wind Gusts Sky, PoP12, QPF, Snow Temp, Dew, AppT, RH Wave Height, Tropical Winds Hazards, Convection, Climate Outlooks Measuring Forecast Continuity 3
4 How is NDFD Produced? National Centers Model Guidance Grids Detailed Interactive Collaborative Local Digital Forecast Database Field Offices Collaborate Data and Science Focus National Centers NWS Automated Products User-Generated Products Text Digital National Digital Forecast Database Graphic Voice Measuring Forecast Continuity 4
5 MaxT Change Accumulation One week example of forecasts valid on January 31, 2006 Measuring Forecast Continuity 5
6 MinT Change Accumulation One week example of forecasts valid on January 31, 2006 Measuring Forecast Continuity 6
7 GMOS MaxT GMOS MaxT Accum Change GMOS MaxT Net Change Measuring Forecast Continuity 7
8 NDFD MaxT NDFD MaxT Accum Change NDFD MaxT Net Change Measuring Forecast Continuity 8
9 Forecast Convergence Score The Forecast Convergence Score (FCS) is an index that measures the number and size of swings in forecasts made over a series of forecast cycles for forecasts valid at the same time. The FCS has four terms: FCS = ( T1 + T2 ) ( T3 + T4 ) Measuring Forecast Continuity 9
10 Forecast Convergence Score FCS = ( T1 + T2 ) ( T3 + T4 ) The first term (T1) is the number of forecasts that changed insignificantly (less than a threshold) from the previous forecast Fi-1 OR moved closer to the next forecast Fi+1, where i varies from 2 to n. When i=n, the observation is used as the next forecast Fi+1. T 1 = n i= 2 1 if 1 if 0 F F if i i F F i 1 i+ 1 neither of < threshold < F i F above i 1 Measuring Forecast Continuity 10
11 Forecast Convergence Score FCS = ( T1 + T2 ) ( T3 + T4 ) The second term (T2) is the difference between the first and last forecast scaled by the significance threshold T = Fn F 2 1 threshold Measuring Forecast Continuity 11
12 Forecast Convergence Score FCS = ( T1 + T2 ) ( T3 + T4 ) The third term (T3) is the number of possible forecast changes. T3 = n 1 Measuring Forecast Continuity 12
13 Forecast Convergence Score FCS = ( T1 + T2 ) ( T3 + T4 ) The fourth term (T4) is the sum of forecast changes scaled by the significance threshold. n T4 = Fi Fi 1 i= 2 threshold Measuring Forecast Continuity 13
14 Forecast Convergence Score ( T1 + T2 ) FCS = ( T3 + T4 ) # of swings + size of swings The T1 and T3 terms account for the actual and possible number of swings, respectively. The T2 and T4 terms account for the size of the swings. A significance threshold specifies the minimum change necessary to count as a swing The FCS can range from near 0 (many large swings away from the next forecast) to 1.0 (no swings). Measuring Forecast Continuity 14
15 Case Study - NDFD Measuring Forecast Continuity 15
16 Case Study - GMOS Measuring Forecast Continuity 16
17 Case Study from TABLE 1. Ruth et al NDFD KSLC KORD KBOS Issuance NDFD MOS GMOS NDFD MOS GMOS NDFD MOS GMOS 0000 UTC 24 Apr F UTC 24 Apr F UTC 25 Apr F UTC 25 Apr F UTC 26 Apr F UTC 26 Apr F UTC 27 Apr F UTC 27 Apr F UTC 28 Apr F UTC 28 Apr F UTC 29 Apr F UTC 29 Apr F UTC 30 Apr F UTC 30 Apr F Ob Measuring Forecast Continuity 17
18 FCS Calculation - KSLC significant swing for threshold = 3 FCS= (T1 + T2) / (T3 + T4) NDFD FCS= (13 + 1/3) / ( /3) = 0.69 MOS FCS= (12 + 7/3) / ( /3) = 0.65 GMOS FCS= (13 + 5/3) / ( /3) = 0.79 Measuring Forecast Continuity 18
19 FCS Calculation - KORD significant swing for threshold = 3 FCS= (T1 + T2) / (T3 + T4) NDFD FCS= (13 + 5/3) / ( /3) = 0.65 MOS FCS= ( 9 + 1/3) / ( /3) = 0.37 GMOS FCS= (13 + 4/3) / ( /3) = 0.73 Measuring Forecast Continuity 19
20 FCS Calculation - KBOS significant swing for threshold = 3 FCS= (T1 + T2) / (T3 + T4) NDFD FCS= (13 + 2/3) / ( /3) = 0.72 MOS FCS= (10 + 3/3) / ( /3) = 0.38 GMOS FCS= (13 + 2/3) / ( /3) = 0.67 Measuring Forecast Continuity 20
21 FCS Significance Thresholds Measuring Forecast Continuity 21
22 FCS by NWS Region CR = Central Region ER = Eastern Region SR = Southern Region WR = Western Region Measuring Forecast Continuity 22
23 FCS by Month of Year Measuring Forecast Continuity 23
24 Summary Score measures continuity of forecasts from one issuance to the next Score was developed and used to improve forecast continuity of Gridded MOS NDFD, MOS, and Gridded MOS continue to be scored on a monthly basis Score is described in 2009 manuscript published in Weather and Forecasting Measuring Forecast Continuity 24
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Climate Division: CA 7 NWS Call Sign: Month (1) Min (2) Month(1) Extremes Lowest (2) Temperature ( F) Lowest Month(1) Degree s (1) Base Temp 65 Heating Cooling 100 Number of s (3) 58.8 34.3 46.6 81+ 1948
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Climate Division: CA 7 NWS Call Sign: Month (1) Min (2) Month(1) Extremes Lowest (2) Temperature ( F) Lowest Month(1) Degree s (1) Base Temp 65 Heating Cooling 100 Number of s (3) 56.0 35.7 45.9 83 1975
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Climate Division: CA 2 NWS Call Sign: Month (1) Min (2) Month(1) Extremes Lowest (2) Temperature ( F) Lowest Month(1) Degree s (1) Base Temp 65 Heating Cooling 100 Number of s (3) 53.7 32.7 43.2 79 1962
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Climate Division: CA 7 NWS Call Sign: Month (1) Min (2) Month(1) Extremes Lowest (2) Temperature ( F) Lowest Month(1) Degree s (1) Base Temp 65 Heating Cooling 1 Number of s (3) 64.8 45.4 55.1 85 1971
More informationClimatography of the United States No
Climate Division: CA 2 NWS Call Sign: Month (1) Min (2) Month(1) Extremes Lowest (2) Temperature ( F) Lowest Month(1) Degree s (1) Base Temp 65 Heating Cooling 100 Number of s (3) 53.3 31.8 42.6 74+ 1975
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