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The Omaha, Nebraska Flash Flood of 7 August 1999 Matthew Kelsch Hydrometeorologist UCAR/COMET ® (Cooperative Program for Operational Meteorology, Education.

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Presentation on theme: "The Omaha, Nebraska Flash Flood of 7 August 1999 Matthew Kelsch Hydrometeorologist UCAR/COMET ® (Cooperative Program for Operational Meteorology, Education."— Presentation transcript:

1 The Omaha, Nebraska Flash Flood of 7 August 1999 Matthew Kelsch Hydrometeorologist UCAR/COMET ® (Cooperative Program for Operational Meteorology, Education and Training) Boulder, Colorado USA

2 The Omaha, Nebraska Flash Flood of 7 August 1999 Rainfall duration: thunderstorms regenerate on quasi-stationary front which is reinforced by cool outflow air (mesohigh) Rainfall intensity: enhanced by strong transport of low level warm, moist air Urbanization increased hydrologic response (more rapid runoff)

3 0600 UTC, 7 August 1999

4 0000 UTC, 7 August 1999

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6 0500 UTC 7 Aug UTC 7 Aug 1999

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8 Aftermath of 7 August 1999 Omaha flash flood

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11 The Omaha, Nebraska Flash Flood of 7 August 1999 Meteorological boundaries act as atmospheric terrain to focus thunderstorms Human engineered drainages can have rapid and severe responses (streams go back to where nature put them)


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