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Ocean Winds Workshop – TPC 06/05-07/2006 The Use of Remotely Sensed Ocean Surface Winds at the NOAA Ocean Prediction Center Joe Sienkiewicz, Joan Von Ahn.

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Presentation on theme: "Ocean Winds Workshop – TPC 06/05-07/2006 The Use of Remotely Sensed Ocean Surface Winds at the NOAA Ocean Prediction Center Joe Sienkiewicz, Joan Von Ahn."— Presentation transcript:

1 Ocean Winds Workshop – TPC 06/05-07/2006 The Use of Remotely Sensed Ocean Surface Winds at the NOAA Ocean Prediction Center Joe Sienkiewicz, Joan Von Ahn 1, Greg McFadden 2 Outline 1. QuikSCAT impact on operations 2. SST impacts on winds 3. Hurricane Force Extratropicals 4. Sea-level pressure retrievals 5. Ongoing evaluations QuikSCAT WindSat 6. Summary 1 STG, Inc 2 SAIC

2 Ocean Winds Workshop – TPC 06/05-07/2006 High Seas Wind Warning Categories GALE – 34-47 knots Force 8/9 STORM – 48-63 knots Force 10/11 HURRICANE FORCE - >64 knots Force 12

3 Ocean Winds Workshop – TPC 06/05-07/2006 QuikSCAT impact on operations QuikSCAT wide swath 2 passes per day consistency large wind range Cultural change revolutionized analysis and forecast process more wind warnings, increased accuracy differentiate between warning categories focus on Hurricane Force conditions SST gradients on surface winds SLP retrievals – improve analyses **Lesson learned - Success due to timely availability in forecaster workstations

4 Ocean Winds Workshop – TPC 06/05-07/2006 SST impact on winds GOES SST Composite

5 Ocean Winds Workshop – TPC 06/05-07/2006 SST impact on winds GOES – Magnitude of SST Gradient QuikSCAT 25 km wind speeds

6 Ocean Winds Workshop – TPC 06/05-07/2006 SST impact on winds GOES – Magnitude of SST Gradient QuikSCAT GFS 10 wind speed difference (knots)

7 Ocean Winds Workshop – TPC 06/05-07/2006 SST impact on winds GOES – Magnitude of SST Gradient 30 day wind speed bias (knots) slightly stable PBL

8 Ocean Winds Workshop – TPC 06/05-07/2006 SST impact on winds GOES – Magnitude of SST Gradient 30 day wind speed bias (knots) slightly unstable PBL

9 Ocean Winds Workshop – TPC 06/05-07/2006 Hurricane Force Extratropicals

10 Ocean Winds Workshop – TPC 06/05-07/2006 5 Year total Atlantic 134 Pacific 126 12.5 km resolution QuikSCAT became available

11 Ocean Winds Workshop – TPC 06/05-07/2006 Atlantic Tracks 2005-06 LOW GALE STORM HURCN FORCE

12 Ocean Winds Workshop – TPC 06/05-07/2006 Pacific Tracks 2005-06 LOW GALE STORM HURCN FORCE

13 Ocean Winds Workshop – TPC 06/05-07/2006

14 0 66% 75%

15 Ocean Winds Workshop – TPC 06/05-07/2006 Composite of maximum winds (knots) 300nm 200nm 100nm HF FORCE STORM GALE 300nm 200nm 100nm North AtlanticNorth Pacific 11 QuikSCAT passes32 QuikSCAT passes

16 Ocean Winds Workshop – TPC 06/05-07/2006

17 SLP Retrievals QuikSCAT Winds University of Washington PBL Model Calculates Pressure Gradient Seed with Observations (mean SLP) SLP

18 Ocean Winds Workshop – TPC 06/05-07/2006

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21 Quikscat Evaluation QuikSCAT Old Rain Flag

22 Ocean Winds Workshop – TPC 06/05-07/2006 Quikscat Evaluation QuikSCAT New Rain Flag

23 Ocean Winds Workshop – TPC 06/05-07/2006 Quikscat Evaluation QuikSCAT Old Wind Speeds

24 Ocean Winds Workshop – TPC 06/05-07/2006 Quikscat Evaluation QuikSCAT New Wind Speeds

25 Ocean Winds Workshop – TPC 06/05-07/2006 WindSat Evaluation

26 Ocean Winds Workshop – TPC 06/05-07/2006 WindSat Evaluation Interpolated to grid Wind Speed Wind Direction Cloud Liquid Water Total Precip Water Rain Rate SST WindSat WS – Filled Contours QuikSCAT Wind Barbs

27 Ocean Winds Workshop – TPC 06/05-07/2006

28 Interpolated to grid Wind Speed Wind Direction Cloud Liquid Water Total Precip Water Rain Rate SST WindSat Evaluation

29 Ocean Winds Workshop – TPC 06/05-07/2006 Interpolated to grid Wind Speed Wind Direction Cloud Liquid Water Total Precip Water Rain Rate SST WindSat Evaluation

30 Ocean Winds Workshop – TPC 06/05-07/2006 Interpolated to grid Wind Speed Wind Direction Cloud Liquid Water Total Precip Water Rain Rate SST WindSat Evaluation

31 Ocean Winds Workshop – TPC 06/05-07/2006 WindSat Wind Speed CLW QuikSCAT Wind barbs Equatorial Atlantic

32 Ocean Winds Workshop – TPC 06/05-07/2006

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34 E of Newfoundland

35 Ocean Winds Workshop – TPC 06/05-07/2006

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39 Summary - Remotely Sensed Surface Winds Integral part of analysis and warning process –Revolutionized operations QuikSCAT –differentiate between warning categories –SST influences –Consistency –Rain contamination –SLP Retrievals – extends applicability QuikSCAT changes –Positive WindSat –Additional EDR’s crucial –Sensitivity to Cloud Liquid Water Low threshold (overestimate WS) High CLW – underestimate WS –Lacks consistency (warning criteria) –Still evaluating – have not introduced to forecasters Paper – Operational Impact of QuikSCAT Winds at the NOAA Ocean Prediction Center – Von Ahn et al. 2006 next issue Weather and Forecasting

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