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Published byPhilomena May Modified over 9 years ago
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1 Historic Spring Flooding Ohio River Valley and Mississippi River Ernie Wells Hydrologic Services Division
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2 Snow Water Equivalent Substantial stored water in the snow pack represents significant flooding potential in the North Central and Northeast as the spring thaw begins March 18, 2011
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3 National Hydrologic Assessment Spring 2011 – Issued March 17, 2011
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4 River Observations May 3 Observations of major to record crest levels in the Ohio River Valley along the Mississippi River http://water.weather.gov
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5 Observed Precipitation April 18, 2011 – May 2, 2011 During the previous 2 weeks, a broad area of Central US received 10-20+ inches of precipitation; 600% of normal precipitation
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6 Forecasted Precipitation May 2, 2011 – May 7, 2011 During the next 5 days, a broad area of Central US received 0.5 - 2 inches additional rain (much has already fallen)
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7 Extended Range Forecasts 6-10 Day Forecasts Precipitation (May 8-12)Precipitation (May 10-16) 8-14 Day Forecasts
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8 Hydrologic “Perfect Storm” WFO Paducah, KY Confluence of Ohio River and Mississippi River
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9 Hydrologic “Perfect Storm” Cairo, IL - Confluence of Ohio River and Mississippi Historic levee break at New Madrid relieving flood crest at Cairo
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10 Hydrologic “Perfect Storm” WFO - Memphis Crest Moving downstream – expect flooding through June
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11 River Forecasts May 3 – next 48 hours Short-term streamflow forecasts predict minor to major crest levels in the Northeast, Ohio River Valley, and Alabama and Mississippi http://water.weather.gov
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