Several rounds of showers and thunderstorms June 2-5 brought heavy rains to the area with some reports as high as 4 inches. This eventually lead to major river flooding on the Wapsipinicon River near De Witt June 6-7.
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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 rounds of showers and thunderstorms June 2-5 brought heavy rains to the area with some reports as high as 4 inches. This eventually lead to major river flooding on the Wapsipinicon River near De Witt June 6-7.
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 6, 6:23 AM CST, 4 hours 7 minutes earlier.
Area Forecast Discussion National Weather Service Quad Cities IA IL 723 AM CDT Sat Jun 6 2020 .UPDATE... Issued at 721 AM CDT Sat Jun 6 2020 Weak upper level disturbance moving through the area is providing just enough lift on the resident moisture to produce isolated showers and sprinkles. Thus the forecast is being updated to reflect isolated showers and sprinkles that will dissipate with time this morning. && .SYNOPSIS... Issued at 400 AM CDT Sat Jun 6 2020 A weak upper level disturbance, combined with mid level moisture advection, and steeper mid level lapse rates has triggered a band of showers and thunderstorms across north central and northeast IA early this morning. The storms have tracked e and se into the nw portions of the dvn cwa. Lightning and brief heavy rainfall has been common with these storms. These storms are expected to fall apart as they keep moving eastward away from the better parameters. && .SHORT TERM...(Today and Tonight) ISSUED AT 400 AM CDT Sat Jun 6 2020 Today: Mostly sunny to partly cloudy across the cwa with sprawling high pressure across Ontario and the Great Lakes region. Northeast to east winds will bring comfortable humidity levels to much of the area, making for a rather pleasant day. Highs will range from around 80 along Hwy 20 to the mid 80s south. Tonight: Continued pleasant weather with clear to partly cloudy skies and comfortable conditions. Lows will range from the mid 50s northeast cwa to the lower to mid 60s southwest. .LONG TERM...(Sunday through Friday) ISSUED AT 400 AM CDT Sat Jun 6 2020 Overview: Quiet and very warm weather is expected Sunday and Monday with highs in the 80s Sunday and lower 90s Monday. Humidity will increase from Sunday afternoon into Monday with dewpoints likely in the 60s. The remnant low from tropical system Cristobal is forecast to track from the Deep South into the Mid and Upper Mississippi Valley, potentially bringing a swath of heavy rain to parts of the local area on Tuesday. Sunday and Monday An amplified upper ridge will slowly slide across the Central U.S. leading to dry conditions and above normal temperatures. Forecast highs on Sunday range from the low 80s NE to mid/upper 80s central and west. The humidity Sunday morning will be very comfortable with dewpoints only in the upper 40s/low 50s. By the afternoon, expect the humidity to become noticeable as evapotranspiration and southeast surface winds push dewpoints into the low to mid 60s. The warmest day of the week will be Monday with highs in the lower 90s for much of the outlook area. Dewpoints in the mid to upper 60s will make it feel like the mid 90s during the afternoon. The upper ridge should keep us dry into Monday night. Tuesday and Wednesday The remnant low from tropical system Cristobal is forecast to track almost due north from the Louisiana Gulf Coast into the Mid and Upper Mississippi Valley. Models have the system reaching central Missouri by late Monday night, still maintaining a ~992mb central pressure. As Cristobal's mid-level vorticity max begins to interact with a broad right entrance region of a mid-latitude upper jet, and becomes negatively tilted, the surface low is expected to strengthen to below 990mb once it reaches southern Wisconsin. Based on the current forecast track, a widespread 1 to 3 inches of rain is possible across the outlook area by Wednesday morning. There could end up being a narrow band of 3 to 5 inches, but it's too early to know where this will set up. Not surprisingly, integrated water vapor transport vectors are directed from the Gulf into the local area from Monday night through Tuesday. During this time, a surge of tropical moisture, with PWATs up to 2.3", may overspread eastern Iowa and northwest Illinois. These values are about 3 standard deviations above the mean for early June in the NAEFS data. Of greatest concern would be areas that receive 3"+ of rainfall, which could lead to areal flooding and eventual river flooding. The strengthening extra-tropical (which means not tropical) low will race northward into the northern Great Lakes into Wednesday, leading to windy and cooler conditions locally. Thursday On Quiet weather and lower humidity is forecast for the end of the week. Model blend highs are in the 70s with lows in the 50s. Very comfortable for this time of year! Uttech && .AVIATION...(For the 12Z TAFS through 12Z Sunday Morning) ISSUED AT 628 AM CDT Sat Jun 6 2020 VFR conditions will dominate this TAF cycle. Northeast to east winds around 10 kts, will veer southeast tonight as high pressure builds across the Great Lakes region. && .HYDROLOGY... Issued at 925 PM CDT Fri Jun 5 2020 Recent swaths of heavy rainfall has led to rises on some area rivers, especially on the Iowa tributaries. The Wapsipinicon River near De Witt will crest in the moderate flood range at 12.3 feet on Saturday, while higher stream flows continue on portions of the Iowa and Cedar Rivers. The Cedar River at Conesville experienced a secondary crest bump just under the flood stage earlier this afternoon, but is now falling and projected to fall below the 12 foot action stage by early Sunday morning. The Mississippi continues to run over action stage or even the minor flood stage on much of the stretch of the river from the Quad Cities on southward. Tributary input, localized heavy rain run-off and routed flow all contributing to these broad rises along these sections of the mainstem. Looking ahead to next week, potential heavy rainfall from the remnants of tropical system Cristobal Tuesday into Wednesday, could have significant impacts on the local waterways. Widespread heavy rainfall would lead to additional rises on area rivers, and aggravate already high levels on several of these waterways. At this time it is still too early to tell where the brunt of the heavy rain will lay out, and thus the associated extent of the impacts the run- off would have on the rivers. ..12.. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && UPDATE...08 SYNOPSIS...Haase SHORT TERM...Haase LONG TERM...Uttech AVIATION...Haase HYDROLOGY...12
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 416 AM CDT Sat Jun 6 2020 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-070930- 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- 416 AM CDT Sat Jun 6 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...TODAY AND TONIGHT Area rivers are experiencing flooding. Please see the latest Flood Statements and Flood Warnings for details. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY The remnants of tropical system Cristobal is expected to track from Louisiana to eastern Iowa Tuesday through Wednesday. This may bring heavy rainfall and severe weather but it is too early to determine details. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight. Haase
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 1030 AM CST on June 6 and fell back below major flood stage around 1245 on June 7. The river crested at 12.57 feet at 5 PM CST on June 6.
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: 900034.