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Iowa Spring Flood Potential Briefing

Iowa Spring Flood Potential Briefing. Jeff Zogg Senior Hydrologist National Weather Service Des Moines, IA February 5, 2009. “America’s Weather Enterprise: Protecting Lives, Livelihoods, and Your Way of Life”. Highlights. Spring flood risk: near to above normal in most places

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Iowa Spring Flood Potential Briefing

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  1. Iowa Spring Flood Potential Briefing Jeff Zogg Senior Hydrologist National Weather Service Des Moines, IA February 5, 2009 “America’s Weather Enterprise: Protecting Lives, Livelihoods, and Your Way of Life”

  2. Highlights • Spring flood risk: near to above normal in most places • River basins of most concern: • Cedar-Iowa (upper & lower) • Des Moines (upper & middle) • Rock (upper) • Floyd (upper) • Ice jam risk: near to above normal

  3. Highlights (cont’d) • Assumptions: next few months—near normal weather and snow melt conditions • Typical highest water time frames • Inland Iowa streams & Big Sioux River: mid March to early April • Mississippi River: mid April to early May • Missouri River: mid March to early April* * potentially affected by regulation

  4. Flood risk (NWS)

  5. Flood risk (cont’d) (NWS)

  6. Flood risk (cont’d) (NWS)

  7. Flood risk (cont’d) (NWS)

  8. Flood risk (cont’d) (NWS)

  9. Flood risk (cont’d) (NWS)

  10. Stream flow (USGS) Past month Now

  11. Soil moisture (NOAA) Now Past month

  12. Snow pack (NOAA) Minus normal Snow depth

  13. Snow water equivalent (NOAA) 1 year ago Now

  14. 3-month outlook (NOAA) Precipitation Temperature

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