Several more rounds of heavy rain across the Wapsipinicon River basin during the last week of June brought a third round of major river flooding to the Wapsipinicon River near De Witt. This flooding continued into the early morning hours of July 1.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS DVN wrote it up.
Several more rounds of heavy rain across the Wapsipinicon River basin during the last week of June brought a third round of major river flooding to the Wapsipinicon River near De Witt. This flooding continued into the early morning hours of July 1.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Quad Cities, IA wrote its last area forecast discussion before the first event at Jun 28, 2:24 PM CST, 2 hours 36 minutes earlier.
Area Forecast Discussion National Weather Service Quad Cities IA IL 324 PM CDT Sun Jun 28 2020 .SYNOPSIS... Issued at 325 PM CDT Sun Jun 28 2020 The upper level ridge which has been stymied over the area is shifting east as a potent shortwave centered over northwest Iowa continues moves northeast. The warm and humid air mass over the region persists, though temps have been limited by the persistent cloud cover associated with the overnight MCS that clipped the southern CWA. Meanwhile a warm lies across the CWA south of I-80. && .SHORT TERM...(This Evening through Monday) ISSUED AT 325 PM CDT Sun Jun 28 2020 The potential for isolated to scattered thunderstorms exists latter this afternoon and early even. Given flow aloft and high precipitatible values, can't rule out locally heavy rain. Later tonight the main action looks to be mainly north of the CWA with development of another MCS. However, CAMs suggest some potential for the northern part of the CWA to get clipped, so overnight PoPs reflect this scenario. Monday...looks like much of the CWA will be fully in the warm sector and reach near 90 degrees. With dew points in the lower 70s, this will push heat indicies well into the mid-upper 90s. This might be the highest values we've seen so far this warm season. While below advisory criteria, this could be impactful and worth messaging as the first event of the season. .LONG TERM...(Monday Night through Sunday) ISSUED AT 325 PM CDT Sun Jun 28 2020 Key messages: 1) Active pattern into mid week but dry hours in between. 2) Hot and dry late in the week and beyond. Details: Monday night through Thursday: Pattern remains locked in with deep trough in the Rockies, Closed low in New England, and weak ridging in the Midwest. This weak ridging/weak cap allows for daily chances for scattered thunderstorms, especially in the afternoon/evening. Very warm and humid conditions will prevail with highs in the 80s and lows in the upper 60s to lower 70s. Pops will be generally in the 30 to 40 percent range each day. However, there will also be plenty of dry hours in between any rounds of storms. Friday through next weekend: GFS/ECMWF build the upper level ridge in the central United States with a strengthening cap. This should suppress convection allowing for plenty of sunshine and hot and humid conditions. Highs should push 90+ with lows near 70. This pattern looks to be persistent so this very warm to hot weather should continue through at least the first week of July. Haase && .AVIATION...(For the 18Z TAFS through 18Z Monday Afternoon) ISSUED AT 1241 PM CDT Sun Jun 28 2020 Isolated to scattered thunderstorms are again possible today through tomorrow, with the most organized storms likely overnight but mainly north of the area. Storm chances are too low to include in the TAFs at this point. CID and DBQ will see chances increase after 06z, but still too low to include in the TAFs at this time. && .HYDROLOGY... Issued at 1205 PM CDT Sun Jun 28 2020 Minor to moderate flooding continues on parts of the Cedar and Iowa rivers. Most locations in these basins are nearing crest or have crested. Palo Blairs Ferry Road has fallen below flood stage and the warning was cancelled. Meanwhile on the Wapsipinicon River, major flooding is still forecast at De Witt. On the Mississippi River, flood warnings remain in effect for Gladstone and Burlington for minor flooding. Meanwhile, a Flood Watch remains in effect for Keithsburg where there is uncertainty on routed flow with the latest forecast trends having lowered and now is shown to just reach minor flood stage on Tuesday. An active pattern will linger over the region for the next week or so. While widespread heavy rains are not anticipated at this time, some locally heavy rains will be possible, which may result in continued or new flooding concerns at some locations. However, confidence is low on rain amounts and any impacts on rivers. It should also be noted that there will be plenty of dry, rain free, hours as well. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && SYNOPSIS...Wolf SHORT TERM...Wolf LONG TERM...Haase AVIATION...Wolf HYDROLOGY...Haase
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 1251 PM CDT Sun Jun 28 2020 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-291800- Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson- Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll- Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson- Warren-Hancock-McDonough-Scotland-Clark- 1251 PM CDT Sun Jun 28 2020 This Hazardous Weather Outlook is for portions of north central Illinois...northwest Illinois...west central Illinois...east central Iowa...northeast Iowa...southeast Iowa and northeast Missouri. .DAY ONE...THIS AFTERNOON AND TONIGHT Isolated to scattered thunderstorms are possible this afternoon and tonight, especially along the US Highway 20 corridor overnight. Threats from these storms include lightning, heavy rain, and strong winds. Area rivers are experiencing flooding. Please see the latest Flood Statements and Flood Warnings for details. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY There are chances of showers and thunderstorms through the period. It is too early to determine the severe weather potential each day. Monday will be a hot and humid day with heat indices across the area in the mid to upper 90s on Monday afternoon. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed for portions of the Outlook area this morning, and again late this afternoon through evening. Wolf
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
The Wapsipinicon River near De Witt rose above its major flood stage of 12.5 feet around 5 PM CST on June 28 and remained above major flood stage through the end of the month. The river crested at 12.83 feet around 730 PM on June 28.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2020Every state in 2020This day in weather historyWarnings in Iowa, June 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 901197.