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NOAA’s National Weather Service NDFD Conceptual Overview

NOAA’s National Weather Service NDFD Conceptual Overview. David P. Ruth Meteorological Development Laboratory National Digital Forecast Database Technical Workshop August 13, 2003. The NWS Strategic Plan.

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NOAA’s National Weather Service NDFD Conceptual Overview

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  1. NOAA’sNational Weather ServiceNDFD Conceptual Overview David P. RuthMeteorological Development Laboratory National Digital Forecast Database Technical WorkshopAugust 13, 2003

  2. The NWS Strategic Plan • Deliver a credible, timely, and relevant suite of seamless weather, water, and climate products and services which exploit technology to the fullest to meet customer and partner needs. • Post NWS products and data on the Internet in graphic-oriented format (2002) • Prepare and disseminate NWS forecast products in digital form (2003)

  3. Benefits to Interactive Forecast Preparation • Maximizes human contribution to forecast process • Provides more forecast detail in time and space • Enables more effective communication with users (e.g., graphics) • Increases the usefulness of NWS forecasts to customers and partners

  4. How does IFPS work? • A 7-day digital forecast database is established at each WFO • Forecasters interactively modify the contents of the database according to the latest observations and model guidance • NWS text, tabular, voice, and graphical products are generated from the database • The database itself is provided as an NWS product to customers and partners

  5. IFPS Grid Editor

  6. Computer Worded Forecast .TONIGHT...CLEAR. LOW IN THE MID 30S. LIGHT WIND EARLY BECOMING SOUTHWEST 10 TO 15 MPH AFTER MIDNIGHT. .SUNDAY...MOSTLY SUNNY AND WARMER. HIGH IN THE UPPER 60s. SOUTHWEST WIND 15 TO 25 MPH BECOMING NORTH DURING THE AFTERNOON. .SUNDAY NIGHT...CLEAR. LOW AROUND 30. LIGHT WIND. .MONDAY...SUNNY AND COOLER. HIGH IN THE MID 50S.

  7. Digital Forecast Matrix WVZ033-034-VAZ003-004-131124- BUCHANAN VA-DICKENSON VA-MCDOWELL WV-WYOMING WV- INCLUDING THE CITIES OF...CLINTWOOD VA...GRUNDY VA...PINEVILLE WV... WELCH WV 324 PM EST SAT JAN 12 2002 SUN 01/13/02 MON 01/14/02 EST 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 POP 12HR 40 20 10 30 40 QPF 12HR .01-.10 0 0 .01-.10 .01-.10 MAX QPF .01-.10 0 0 .01-.10 SNOW 12HR 00-00 00-00 00-00 MN/MX 27 31 32 36 40 42 22 28 30 36 40 41 30 32 34 TEMP 45 41 37 32 33 36 39 39 36 33 30 28 30 34 38 39 DEWPT 31 31 30 30 29 29 28 28 26 26 26 25 25 26 28 30 RH 58 67 76 92 85 75 64 64 67 75 85 88 81 72 67 70 WIND DIR SW W W W NW NW NW NW W W W SW S S SW SW WIND SPD 10 12 15 15 15 15 15 12 10 8 8 8 12 15 15 10 10 10 5 5 CLOUDS SC B1 B2 B2 B1 B1 B1 SC SC SC SC SC B1 B1 B1 B1 B2 B2 B2 B2 RAIN C C C SNOW C C C C C C C WIND CHILL 26 18 11 13 17 21 24 23 23 19 17 12 14 19 27

  8. Experimental web product

  9. NDFD Definition • 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

  10. NDFD Benefits • Provides weather information to “drive” custom applications developed by private sector • - Decision support systems that fit the forecast to the problem • - Weather information along a path • - Text generation in more than one language • - Forecasts for vehicles and hand-held devices with GPS • - Controls for smart appliances (e.g., heating, cooling, irrigation) • - Graphics for mass media

  11. NDFD forecast elements • The NDFD will contain: • Weather, water, and climate forecasts from WFOs, RFCs, and NCEP Service Centers • Elements that support generation of current WFO products • Digital watch, warning, and advisory information • Elements that would attract user development of graphics and decision tools • The official NWS forecast for each element

  12. Current NDFD experimental elements • Daytime maximum and nighttime minimum temperature • Probability of Precipitation (12 hour) • Significant weather • Sky cover • Temperature • Dewpoint temperature • Wind direction and speed • Precipitation amount (QPF) • Snow amount • Wave height

  13. NDFD Resolution • Spatial resolution: • - 5 km grids for now • - 2.5 km grids when AWIPS hardware allows • Temporal resolution: • - 3 hourly for days 1-3 • - 6 hourly for days 4-7 • - as available from CPC beyond day 7 • Update frequency: every hour

  14. NDFD Prototype 2001- 2002

  15. IFPS 2003 Operational Readiness Demonstration

  16. NDFD ORD success criteria • Timeliness: New day 7 grids from each WFO are available by 1800 UTC each day 95 percent of the time • Availability: Grids available 95 percent of the time • Consistency: Meteorological consistency along WFO CWA boundaries of all transmitted grids within prescribed thresholds 90 percent of the time • Verification: Point verification statistics for maximum and minimum temperature and PoP within natural variability bounds as compared with past years for same dates (June 16 – July 15)

  17. Current NDFD performance (August 2003) • Timeliness: New day 7 grids from each WFO are available by 1800 UTC each day 85-95 percent of the time. [varies by element] • Availability: Grids available 95 percent of the time. • Consistency: Meteorological consistency along WFO CWA boundaries of all transmitted grids are within prescribed thresholds 90-95 percent of the time. [varies by element]

  18. NDFD ORD verification

  19. NDFD ORD verification

  20. NDFD ORD verification

  21. NDFD beyond 2003 • Finer temporal and spatial resolution • Additional forecast elements • Derived parameters, fire weather, marine • Probabilistic • Digital forecasts from NCEP service centers • 3D grids capable of supporting aviation services • Watches, Warnings, and Advisories • based on Valid Time Event Codes • excluding short-fused convective • Meteorological objects (in BUFR) • Interactive web services

  22. NDFD elements under development • Apparent temperature (Heat index + wind chill) • Relative humidity • Floating PoP12 index (?) • Wind gust speed • Max/min relative humidity • Lightning Activity Level • Mixing height • Transport wind direction and speed • Haines index • Visibility • Ice coverage • Swell height and direction

  23. Probabilities in NDFD(August 2003) • PoP12 • Floating PoP12 index (internal) • Prob/Cvrg Codes for specific precip types (e.g., snow, tstm) • Slight Chance/Isolated (20%) • Chance/Scattered (30%-50%) • Likely/Numerous (60%-70%) • Occasional/Definite/Widespread (80%-100%)

  24. Probabilities in NDFD (proposed) • Percent probability of frozen precipitation • Percent probability of freezing precipitation • Percent probability of thunderstorms • Exceedence forecasts for preset confidence levels • Max QPF • Max wind speed • Max wave height • Max max temp (summer) • Min min temp (winter) • Max snow amount

  25. Digital forecasts from NCEP Service Centers • CPC – Temperature and precipitation anomalies • HPC – Surface front forecasts (BUFR) • OPC & TPC – Offshore and high seas wind, wave, and pressure forecasts • AWC – Aviation objects in BUFR (phase 1) – 3D grids (phase 2)

  26. 3D grids capable of supporting aviation services • Important to NWS, but... • Manipulating grids of clouds and weather is not simple • Cloud layers , ceilings, visibilities, and PROB40 not easy to represent digitally • Will need help of user community and FAA

  27. IFPS/NDFD in a nutshell …to digital data streams from teletype text…

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