National Weather Service Situation Report
National Weather
National
WeatherService
Service
City, Moines,
State IA
Des
Situation
Situation Report
Report
Tuesday,
Tuesday,October
October 09,
09, 2018 4:40 AM
[HazardofHeadline]
Several More Rounds
Rain Today and Tonight
Message of the Day:
? Additional moderate to heavy rainfall exacerbates areal and flash
flooding concerns
? River flooding becoming more widespread as rain keeps falling
? Risk of severe storms later today ¨C damaging winds and a few
tornadoes possible
Important Forecast Changes
? Increasing severe weather threat later today
? Minor changes to rainfall amounts, mainly northwest
? Changes to some river flooding forecasts
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Situation Report
National Weather Service
Des Moines, IA
Tuesday, October 09, 2018 4:40 AM
Flooding Potential Through Tonight
Potential Impacts:
? Flash flooding possible
? Water over roads and rises on local creeks/streams
? More significant river flooding possible
Certainty & Considerations
? High confidence in rainfall
? Medium confidence in amounts and location
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National Weather Service
Des Moines, IA
Situation Report
Tuesday, October 09, 2018 4:40 AM
Severe
Today
Into Tonight
TwoStorm
More Risk
DaysLater
of Heat
& Humidity
Key Points
Hazards:
Strong, gusty winds
Tornadoes possible
Lightning
Areas Impacted:
Southeast half of Iowa
Timing & Duration:
Afternoon into early tonight
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Impacts:
Damage to Property/Vehicles
Damage to Trees
Tornado threat
Certainty & Considerations:
High confidence in storms
Low confidence in precise location
and in occurrence of tornadoes
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Situation Report
National Weather Service
Des Moines, IA
Tuesday, October 09, 2018 4:40 AM
Flood Watches Through Wednesday Morning
Potential Impacts:
? Considerable overland flooding in low lying areas
? Ponding of water on roads, possibly over roads
? Rises on local creeks/streams
Certainty & Considerations
? High confidence in rainfall
? Medium confidence in amounts and location
Flood and Flash Flood Watches for nearly all of Iowa
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National Weather Service
Des Moines, IA
Situation Report
Tuesday, October 09, 2018 4:40 AM
Expected River Flood Impacts This Week
Potential Impacts and notes:
? Flood category projections on next page are based both
on rain that has already fallen and on expected rainfall
? If the additional rainfall materializes as forecast,
widespread flooding will occur across much of Iowa
? Only Moderate or Major flooding forecasts noted here,
with minor flooding or within bank rises anticipated at
other sites
? Confidence low to medium in these forecasts due to
forecast rainfall uncertainties and future reservoir release
changes
Timing
? Flooding will begin today and continue through at least
this weekend at many sites
Note: Flooding along Des Moines River at 2nd Ave in
Des Moines is highly dependent upon Saylorville
Reservoir releases and not listed.
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