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Hurricane Matthew Anatomy of a Flood

Hurricane Matthew Anatomy of a Flood. Impacts and Forecasts. Bill Sammler Warning Coordination Meteorologist National Weather Service – Wakefield, VA. Overview. Third Significant Rainfall Event in 6 weeks Interaction with Cold Front Enhanced Winds near the coast (SE VA/NE NC)

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Hurricane Matthew Anatomy of a Flood

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  1. Hurricane Matthew Anatomy of a Flood Impacts and Forecasts Bill Sammler Warning Coordination Meteorologist National Weather Service – Wakefield, VA

  2. Overview • Third Significant Rainfall Event in 6 weeks • Interaction with Cold Front Enhanced Winds near the coast (SE VA/NE NC) • Matthew Not Truly Tropical • Storm Surge/Beach Erosion a Problem • Track Forecasts Were As Not Helpful in Assessing Potential Impacts As They Normally Are

  3. Tropical Cyclone Rainfall Hurricane Irene – 2011 vs. Floyd - 1999 Track

  4. Tropical Cyclone Rainfall Hurricane Irene – 2011 vs. Isabel - 2003 Track

  5. Hurricane Matthew Track

  6. Hurricane Matthew Rainfall Track

  7. The Anatomy of the Flood

  8. Salient Points • Widespread Major Floods Rarely Result from a Single Heavy Rain Event • Antecedent Moisture Conditions Play a Critical Role • Heavy Rainfall in September Made Matthew’s Flooding Possible • Rainfall Pattern Resulted in Unusual Impacts

  9. September Rainfall

  10. Hurricane Matthew Rainfall

  11. Where Does the Water Go? Max Rainfall September through Matthew

  12. Tidal vs. River Graphs

  13. Tidal vs. River Graphs

  14. Tidal vs. River Graphs South Mills, NC - 9/15 to 10/18 Record Stage 6 Days above “record” stage!!

  15. The End!! Now for a Discussion of the Impacts william.sammler@noaa.gov

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