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Understanding H-VTEC: Enhancing Flood Warning Systems in the TV Area

H-VTEC is a standardized coding system implemented by the National Weather Service (NWS) to improve the clarity and consistency of flood warnings, advisories, and watches. Currently testing in Tennessee, Alabama, and Kentucky, H-VTEC utilizes a specific format that includes critical information like flood severity, immediate cause, and time frames for flood events. As NWS expands this system, accurate forecasting plays a crucial role in public safety, ensuring communities receive timely alerts to prevent disaster during flooding situations.

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Understanding H-VTEC: Enhancing Flood Warning Systems in the TV Area

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  1. H-VTEC in Hydro Products Jason ElliottNWS Huntsville

  2. What is H-VTEC? • Standardized coding that will appear in all watch/warning/advisory products • NWS is testing this code in point-based river flood warnings and statements now. • In the TVA area, the following WFOs are participating in the test: • MRX (Morristown, TN) • HUN (Huntsville, AL) • PAH (Paducah, KY) • All other offices are scheduled to begin using the code in the summer of 2007

  3. The H-VTEC Line • stC001-002-ddhhmm- • /k.aaa.cccc.pp.s.####.yymmddThhnnZB-yymmddThhnnZE+6/ • /nwsli.s.ic.yymmddThhnnZB.yymmddThhnnZC.yymmddThhnnZE.fr/ • hhmm am/pm time_zone day mon dd yyyy • A • nwsli .......................NWS Location Identifier • s ..............................Flood Severity Code • ic .............................Immediate Cause • yymmddThhnnZB ..Flood Beginning Date/Time • yymmddThhnnZC ..Flood Crest Date/Time • yymmddThhnnZE ..Flood Ending Date/Time • yymmdd - Year, Month, and Day • hhnn - Hour and Minute in UTC • “T” & “Z” - non-numeric characters (FIPS/ANSI) • fr .............................Flood Record Status

  4. The Forecast is Important! • stC001-002-ddhhmm- • /k.aaa.cccc.pp.s.####.yymmddThhnnZB-yymmddThhnnZE+6/ • /nwsli.s.ic.yymmddThhnnZB.yymmddThhnnZC.yymmddThhnnZE.fr/ • hhmm am/pm time_zone day mon dd yyyy The forecasts issued by the RFCs and TVA will directly drive the times put in the code. Crest forecasts (when issued) will also directly populate the crest time in the code.

  5. /TEST1.1.ER.061019T0320Z.061019T0600Z.061019T2230Z.NO/ Calculations of Code Times 24 hr Forecast Flood Stage Action Stage Observed Data

  6. /TEST1.1.ER.061019T0331Z.061019T1400Z.061020T0320Z.NO/ Calculations of Code Times 6 hr Forecast Crest Forecast Flood Stage Action Stage Observed Data

  7. The Biggest Pitfall? • stC001-002-ddhhmm- • /k.aaa.cccc.pp.s.####.yymmddThhnnZB-yymmddThhnnZE+6/ • /nwsli.s.ic.yymmddThhnnZB.yymmddThhnnZC.yymmddThhnnZE.fr/ • hhmm am/pm time_zone day mon dd yyyy NWS software recommendations always assume that the forecast is correct! This means you (TVA) may be hearing from us (NWS) more during flood situations…especially as the “fall below flood stage” time approaches or occurs. Because of the coding, we must make a “call” on flood warnings within six hours of the time when the point is forecast to fall below flood stage.

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