the nws/ncar “forecaster over the loop” fort worth operational demonstration
DESCRIPTION
The NWS/NCAR “Forecaster Over the Loop” Fort Worth Operational Demonstration. Human Enhancement of a Thunderstorm Nowcasting System. Eric Nelson, Rita Roberts, Tom Saxen and Huaqing Cai. Ft. Worth Auto-Nowcaster Demonstration. 2 Year Demonstration - PowerPoint PPT PresentationTRANSCRIPT
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The NWS/NCAR The NWS/NCAR “Forecaster Over the “Forecaster Over the
Loop” Fort Worth Loop” Fort Worth Operational Operational
DemonstrationDemonstrationHuman Enhancement of a Human Enhancement of a Thunderstorm Nowcasting Thunderstorm Nowcasting
SystemSystem
Eric Nelson, Rita Roberts, Tom Saxen and Huaqing Cai
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Ft. Worth Auto-Nowcaster Ft. Worth Auto-Nowcaster Demonstration Demonstration
2 Year Demonstration2 Year Demonstration Transfer Auto-Nowcaster Transfer Auto-Nowcaster
capabilities to NWS for gridded capabilities to NWS for gridded aviation forecasts.aviation forecasts.
Demonstrate improved forecast skill Demonstrate improved forecast skill incorporating human forecast input.incorporating human forecast input.
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Auto-Nowcaster RoleAuto-Nowcaster Role
Forecaster USERDATA
ANC
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Demonstration Demonstration ComponentsComponents
NWS CWSUDATA
ANC
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NCAR Auto-NowcasterNCAR Auto-Nowcaster
Routine (5mins) short-term (0-1hour) forecasts of Routine (5mins) short-term (0-1hour) forecasts of thunderstorm initiation, growth and decay.thunderstorm initiation, growth and decay.
Uses fuzzy logic to combine observations, NWP and Uses fuzzy logic to combine observations, NWP and forecaster input to generate nowcasts.forecaster input to generate nowcasts.
Extrapolation
Initiation Forecasts
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Environmental conditions (RUC)Environmental conditions (RUC) Frontal likelihoodFrontal likelihood Layered stabilityLayered stability CAPE (max between 900 and 700 mb)CAPE (max between 900 and 700 mb) CIN (mean value between 975 and 900 CIN (mean value between 975 and 900
mb)mb) Mean 875 to 725 mb Relative HumidityMean 875 to 725 mb Relative Humidity Theta-e gradientTheta-e gradient
Boundary-layerBoundary-layer ConvergenceConvergence LI (based on METARS)LI (based on METARS) Vertical velocity along boundary (maxW)Vertical velocity along boundary (maxW) Boundary-relative steering flowBoundary-relative steering flow New storm development along boundaryNew storm development along boundary
CloudsClouds Clear or CumulusClear or Cumulus Vertical develop as observed by drop in Vertical develop as observed by drop in
IR tempsIR temps Other fieldsOther fields
3hr precip accum3hr precip accum
Blue Regions - Blue Regions - Little chance of storm Little chance of storm developmentdevelopment
Green Regions - Green Regions - Moderate likelihoodModerate likelihoodRed Regions - Red Regions - Areas of forecast initiationAreas of forecast initiation
Predictor Fields used forPredictor Fields used for Combined Likelihood of Initiation Combined Likelihood of Initiation
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Data Sets Analysis Algorithms Predictor Fields
Forecaster Input
Fuzzy Logic Algorithm - Membership functions - weights - Combined likelihood field
Final Prediction
Flow Chart for the Auto-Nowcaster System
Boundaries
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Data Sets Analysis Algorithms Predictor Fields
Forecaster Input
Fuzzy Logic Algorithm - Membership functions - weights - Combined likelihood field
Final Prediction
Flow Chart for the Auto-Nowcaster System
Boundaries
RegimeSelectionPolygo
nsNudging
&
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Initiation Likelihood with No Initiation Likelihood with No Polygon WeightPolygon Weight
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Initiation Likelihood with Polygon Initiation Likelihood with Polygon WeightWeight
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Initiation Likelihood Initiation Likelihood NudgingNudging
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Dryline Initiation CaseDryline Initiation CaseForecast: 2030 UTCRadar: 2030 UTC
Forecast: 2030 UTCRadar: 2130 UTC
April 21, 2005
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Forecast: 2036 UTCRadar: 2036 UTC
Forecast: 2036 UTCRadar: 2136 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2042 UTCRadar: 2042 UTC
Forecast: 2042 UTCRadar: 2142 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2048 UTCRadar: 2048 UTC
Forecast: 2048 UTCRadar: 2148 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2100 UTCRadar: 2100 UTC
Forecast: 2100 UTCRadar: 2200 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2118 UTCRadar: 2118 UTC
Forecast: 2118 UTCRadar: 2218 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2142 UTCRadar: 2142 UTC
Forecast: 2142 UTCRadar: 2242 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2206 UTCRadar: 2206 UTC
Forecast: 2206 UTCRadar: 2306 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2224 UTCRadar: 2224 UTC
Forecast: 2224 UTCRadar: 2324 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2236 UTCRadar: 2236 UTC
Forecast: 2236 UTCRadar: 2336 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2248 UTCRadar: 2248 UTC
Forecast: 2248 UTCRadar: 2348 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2300 UTCRadar: 2300 UTC
Forecast: 2300 UTCRadar: 0000 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Forecast: 2312 UTCRadar: 2312 UTC
Forecast: 2312 UTCRadar: 0012 UTC
White Contour: 60min Initiation Nowcast; Color Shades=Reflectivity >20dbz
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Improvements and Improvements and Continuing WorkContinuing Work
User interface transfer to NWS User interface transfer to NWS AWIPS systemAWIPS system
New regime for elevated convectionNew regime for elevated convection Fine tuning and evaluation of Fine tuning and evaluation of
existing regimesexisting regimes Quantitative statistics on overall Quantitative statistics on overall
human impact on forecastshuman impact on forecasts