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NOAA/NESDIS Operational Satellite OSVW Products

Presented by Paul S Chang. NOAA/NESDIS Operational Satellite OSVW Products. Objectives, Science and Benefit. Requirement Weather & Water: Increase lead-time and accuracy for weather and water warnings and forecasts

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NOAA/NESDIS Operational Satellite OSVW Products

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  1. Presented by Paul S Chang NOAA/NESDIS Operational Satellite OSVW Products

  2. Objectives, Science and Benefit Requirement Weather & Water: Increase lead-time and accuracy for weather and water warnings and forecasts Improve predictability of the onset, duration, and impact of hazardous and severe weather and water events Increase development, application, and transition of advanced science and technology to operations and services. Integrate local, regional, and global observation systems into NOAA’s weather and water services to increase the collaboration between NOAA and external environmental partners Reduce uncertainty associated with weather and water forecasts and assessments Enhance environmental literacy and improve understanding, value, and use of weather and water information and services Science Objective Provide highest quality Satellite Ocean Surface Vector Wind (OSVW) data in near real time (NRT) Benefit National Weather Service forecasters and their customers: Emergency planners General public (recipients of weather warnings)‏ International users

  3. Why Measure Ocean Surface Vector Winds An accurate measurement of wind speed and direction is of extreme importance in Search and Rescue, Aircraft missions, and accident investigation (oil spills, ships sinking)‏ • Weather forecasting • Storm warning • Ship routing • Oil production • Food production and Ocean Ecosystems • Climate Monitoring 1/3 of the total US fishing comes from Alaska waters NOAA Coral Reef Watch uses QuikSCAT wind data to identify regions of persistent low wind conditions Ocean vector wind measurements help forecast the movement, structure and intensity of storms at sea

  4. NESDIS Operational OSVW Products ASCAT (daily coverage)‏ QuikSCAT (daily coverage)‏ Daily ASCAT Ice Products

  5. NOAA ASCAT Data Flow

  6. Satellite Ocean Surface Vector Winds – Impact on NOAA Operations Initiate, continue and terminate marine warnings Marine wind and wave forecasts Properly identify features such as lows, highs, fronts and areas of convergence Real-time verification of numerical weather model guidance which improves wind and wave forecasts A Critical Data Source Supporting Marine Weather Forecasting and Warning Example: Marine Weather Discussion Apr 03, 2008 03/2330Z QUIKSCAT INDICATED EXPANSIVE AREA OF SE 25 TO 30 KT WINDS EXTENDING ACROSS ENTIRE OFFSHORE ZONES FROM CAPE FEAR TO JUST N OF HATTERAS CNYN. Offshore Forecast: HATTERAS CANYON TO CAPE FEAR. OVERNIGHT...SE WINDS 25 TO 30 KT BECOMING SW 20 TO 25 KT LATE. SEAS 9 TO 13 FT SUBSIDING TO 7 TO 11 FT.

  7. Use of ASCAT in NHC/CPHC Tropical Cyclone Discussions – 2007-2009 • Mention of ASCAT in TCDs has increased to nearly 10%, now about half that of QuikSCAT • Biggest limitations is limited coverage, which prevents snapshot of entire system • Quite useful in depressions and storms where rain inflation is mitigated by C-band, however low wind bias limits utility in strong tropical storms and hurricanes • 2007 – ASCAT data available in N-AWIPS only after 27 June • 2009 – Data through 22 September

  8. Example of ASCAT Use ZCZC MIATCDEP4 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION FOUR-E DISCUSSION NUMBER 1 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL EP042008 800 PM PDT TUE JUL 01 2008 ASCAT DATA AT AROUND 16Z SHOWED THAT THE LOW PRESSURE AREA SOUTHWEST OF MANZANILLO MEXICO HAD A BROAD CENTER ELONGATED NORTH-NORTHWEST TO SOUTH-SOUTHEAST. SINCE THAT TIME...SATELLITE IMAGERY INDICATES THAT THE CIRCULATION AND ASSOCIATED SHOWER ACTIVITY HAS SOMEWHAT CONSOLIDATED AT THE SOUTHERN END OF THE ELONGATION. BASED ON THIS...ADVISORIES ARE INITIATED ON TROPICAL DEPRESSION FOUR-E. THE INITIAL INTENSITY IS 30 KT IN AGREEMENT WITH SATELLITE INTENSITY ESTIMATES FROM TAFB AND SAB...AS WELL AS THE OBSERVED WINDS IN THE EARLIER ASCAT DATA. ... THE ASCAT DATA SHOWED 25-30 KT WINDS IN A BAND THAT IS CURRENTLY ABOUT 200 N MI FROM THE CENTER IN THE NORTHEASTERN QUADRANT. WHILE THE CENTER OF THE CYCLONE IS EXPECTED TO REMAIN WELL OFFSHORE... • Used as justification to initiate advisories on TD Four-E (later TS Douglas) and set initial intensity

  9. Future Work – Provide Operational OSVW Products from Future Scatterometer Missions Launch Date 08 09 21 18 19 20 11 14 15 16 17 22 10 12 13 C-band 10/06 Post EPS Europe Ku-band 6/99 QuickScatUSA Combined C- and Ku-band Operating

  10. Challenges and Path Forward Continuing science challenges Characterizing differences in C- and Ku-band scatterometer measurements in limiting environmental conditions in order to mitigate loss of QuikSCAT OSVW data and degradation in NWS wind warning and forecasting products. Next steps Improvements in ASCAT high wind retrievals Transitioning of OSVW measurements from foreign scatterometer missions into operations Path into applications/operations Experimental version of new STAR ASCAT product will be evaluated by users and disseminated to AWIPS and NAWIPS if approved

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