National Weather Service Houston/Galveston Lance Wood Science and Operations Officer Assessing the Impact of MODIS SST Utilizing a local WRF.

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Presentation transcript:

National Weather Service Houston/Galveston Lance Wood Science and Operations Officer Assessing the Impact of MODIS SST Utilizing a local WRF

HGX Local WRF Configuration Workstation Cluster: Two Dell Precision 690 Workstations Intel Quad Xeon Processor with four 2.33 GHz CPUs (8 CPUs) RAM: 4 GB OS: RHEL 5.4 Model: WRF EMS v beta2 Dimension: 129 X 129 Spacing: 4 KM Levels: 35 Length: 30 HR Timestep: 24 seconds Initialized with: NAM218 2 runs every 6 hours (00, 06, 12, 18 UTC) First run utilizes MODIS SST Second run utilizes RTG SST HR Run time: 175 minutes Microphysics: Lin et al. Planetary Boundary Layer: Yonsei University Scheme

WRF at HGX Began utilizing operationally in AWIPS in May 2009 Began utilizing operationally in AWIPS in May 2009 Began two runs (MODIS vs. No MODIS or RTG-SST- HR-Analysis) in late December 2009 for SPoRT assessment Began two runs (MODIS vs. No MODIS or RTG-SST- HR-Analysis) in late December 2009 for SPoRT assessment Began creating images for web on developmental server late January 2010 (Thanks MLB!). Began creating images for web on developmental server late January 2010 (Thanks MLB!). Plan to make WRF images available on web. Plan to make WRF images available on web. Plan to expand domain for CWSU and WFO LCH Plan to expand domain for CWSU and WFO LCH Plan to output text files for individual stations for verification purposes. Plan to output text files for individual stations for verification purposes.

Winter Dec 09 – Feb 10 Examples: Focused on evaluating winds/temps. Focused on evaluating winds/temps. Looked at different flow regimes (onshore - WAA, offshore- CAA, near coast surface low development ). Looked at different flow regimes (onshore - WAA, offshore- CAA, near coast surface low development ). Have archived images that I am still assessing (1/14/2010 to present). Have archived images that I am still assessing (1/14/2010 to present). Work is still preliminary, and is continuing. Work is still preliminary, and is continuing.

Some Geography… NW Gulf Continental Shelf Shallow near-shore waters

Onshore Flow WAA Case Jan UTC F4 HR

UTC F10 HR

UTC F16 HR

UTC F22 HR

UTC F28 HR

SFC Low Development Jan UTC F3 HR

UTC F6 HR SFC Low Development Jan. 16

UTC F9 HR

SFC Low Development Jan UTC F12 HR

SFC Low Development Jan UTC F15 HR

SFC Low Development Jan UTC F18 HR

SFC Low Development Jan UTC F21 HR

SFC Low Development Feb 12 0 UTC F6 HR

SFC Low Development Feb 12 3 UTC F9 HR

SFC Low Development Feb 12 6 UTC F12 HR

SFC Low Development Feb 12 9 UTC F15 HR

SFC Low Development Feb UTC F18 HR

SFC Low Development Feb UTC F21 HR

December 30 th Near Coast SFC Low Development December 30 th Near Coast SFC Low Development

Behind Strong Cold Front 2/24/10 03 UTC

Behind Strong Cold Front 2/24/10 04 UTC

Behind Strong Cold Front 2/24/10 05 UTC

Behind Strong Cold Front 2/24/10 18 UTC

Reflectivity pattern with offshore precipitation - Feb 19 Reflectivity pattern with offshore precipitation - Feb 19 MODIS (image) vs. No MODIS

Reflectivity pattern with offshore precipitation - Feb 19 Reflectivity pattern with offshore precipitation - Feb 19 Actual (image) vs. No MODIS

Reflectivity pattern with offshore convection – Feb 26 Reflectivity pattern with offshore convection – Feb 26 MODIS (image) vs. No MODIS

HGX Reflectivity – Feb 26 HGX Reflectivity – Feb 26Actual

Reflectivity pattern with offshore convection – Feb 26 Reflectivity pattern with offshore convection – Feb 26MODIS

No MODIS

What I have observed this Winter: WAA pattern: WRF inland temps were too cool and generally cooler with MODIS SST runs as compared to the runs without MODIS. Over the nearshore waters, surface temps with the MODIS SST data runs were generally too cool and the NO MODIS runs generally produced better surface temp results. surface temp results. Behind strong cold fronts (CAA): WRF temps appeared as good or better over water with MODIS SST, but were still too warm. Winds were very similar in both MODIS and NO MODIS. Nearshore surface low development: Temps appeared to be as accurate, or more accurate across nearshore waters and coastal stations with MODIS SST data included. Reflectivity: There was a slightly different reflectivity forecast over the water and inland areas when the runs (MODIS vs. NO MODIS) were compared.

Going Forward Historical Cases: Would like to run the WRF for a couple of heavy rainfall events (April ). Warm Season Assessment: Sea/Bay Breeze and Convective Initialization Reflectivity patterns in general Use text output to regularly verify temps/dew points at coastal/ near coastal sites. Thanks for support from Mark Keehn (HGX ITO), Scott Overpeck (HGX WRF focal point), and Bob Rozumalski (NWS Nat’l SOO) Questions ????