Several rounds of showers and thunderstorms occurred along the Highway 20 corridor during the afternoon and evening hours. Spotters and Emergency Managers reported rainfall amounts of 2 to 6 inches on already saturated ground, which caused flash flooding of roads and along creeks and streams.
Every event with a place to put it. Tap one for its entry below.
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 occurred along the Highway 20 corridor during the afternoon and evening hours. Spotters and Emergency Managers reported rainfall amounts of 2 to 6 inches on already saturated ground, which caused flash flooding of roads and along creeks and streams. Highway 52 in Dubuque County was closed along with roads in Delaware County and Buchanan County.
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 Oct 1, 12:16 PM CST, 1 hour 59 minutes earlier.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Hazardous Weather Outlook National Weather Service Quad Cities IA IL 1125 AM CDT Mon Oct 1 2018 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-021630- 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- 1125 AM CDT Mon Oct 1 2018 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 Severe thunderstorms are expected to develop late this afternoon across eastern Iowa and much of northern Illinois then diminish late in the evening. The primary risks will be damaging winds and large hail. Isolated tornadoes will also be possible. The storms will be moving rapidly eastward at 35 to 45 mph. The main timing of the severe weather potential is between 4 PM and 10 PM. The Storm Prediction Center has placed a slight risk for severe storms over much of the outlook area. The storms will also have the capability of producing locally heavy rainfall of up to at least an inch. Area rivers are experiencing flooding. Please see the latest Flood Statements and Flood Warnings for details. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY Southwest wind gusts between 35 to 40 mph are forecast from late Wednesday morning through the afternoon. The strong winds combined with very warm temperatures will increase the risk for wildfire starts in cured agricultural fields. If a fire were to ignite, it would spread rapidly. There are chances for thunderstorms Wednesday night through Friday night, and again Saturday night into Sunday. There is a marginal risk of severe storms Wednesday evening, northwest of an Orangeville, Illinois to Keosauqua, Iowa line. Several inches of rain are possible, which would lead to rises on area rivers and another round of river flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation will be needed late this afternoon and evening especially from 4 pm to 10 pm. Haase
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html><!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html><!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>The Quad Cities radar (KDVN), 143 km away, was scanning. The volume nearest the first event began at 20:13 UTC.
3 flash flood. Local standard time, as filed.
Flash flooding caused washouts of gravel roads, and closed some roads in the Winthrop area.
Flash flooding closed numerous roads in Delaware County. Flash flooding along a creek resulted in three feet of standing water and stranded cars in Manchester.
Water from Coffee Creek was backed up into the New Vienna post office at the start of this event time, with additional flooding through the city of Dubuque through the late evening hours.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2018Every state in 2018This day in weather historyWarnings in Iowa, October 2018
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 2026-10-01. Each event’s entry at NCEI: 791919, 786611, 786613.