|Scattered showers and thunderstorms developed during the|afternoon and continued into the evening hours. These showers and thunderstorms were nearly stationary and produced heavy rainfall.
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.
A warm and humid air mass was in place across eastern Iowa on August 28, 2016.|Scattered showers and thunderstorms developed during the|afternoon and continued into the evening hours. These showers and thunderstorms were nearly stationary and produced heavy rainfall. This rain caused some flash flooding in Lousia and Washington Counties. The places that did receive rainfall reported 3 to 6 inches.
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 Aug 28, 5:49 PM CST, 3 hours 26 minutes earlier.
Area Forecast Discussion National Weather Service Quad Cities IA IL 649 PM CDT SUN AUG 28 2016 ...AVIATION UPDATE... .SYNOPSIS... Issued at 300 PM CDT Sun Aug 28 2016 Scattered air mass thunderstorms have formed across a zone from NW Missouri to E Iowa/NW Illinois to N Indiana through this afternoon. Locally, storm coverage was a little lower than areas to the east and west. A few of the storms have produced very heavy localized rainfall amounts. Dual-pol estimated up to 2-3 inches a few miles to the NE of Iowa City in east-central Johnson County. For areas that have not received rain today, which is most of the CWA, it was warm and humid with temps in the mid to upper 80s and dewpoints in the lower to middle 70s. && .SHORT TERM...(This Evening through Monday) ISSUED AT 300 PM CDT Sun Aug 28 2016 This Evening and Tonight...Isolated storms will continue to develop through the evening hours. Anomalously high PWATs near ~1.8 inches according to the SPC Mesoanalysis means a very moist, tropical-like air mass is present, which is supportive of localized heavy rainfall rates of 1-2"/hr. Shear is expected to remain low, thus do not foresee severe weather. For the remainder of tonight, periods of clearing and light winds should set the stage for localized shallow ground fog formation in low-lying areas. Lows are forecast in the middle to upper 60s. Monday...Weak upper-level flow and stagnant warm and humid air mass warrants mention of 20-40% POPs. Models a bit more aggressive on the areal coverage of thunderstorms compared to today (Sunday) within preferential zone of slightly enhanced 0-1 km convergence - especially over the SW half of the forecast area. In this region, lower tropospheric wind flow or streamlines appear as nothing more than a zone of weak confluence. Thunderstorm Threats: As mentioned, the atmosphere remains largely unchanged. Therefore, heavy rainfall rates and localized flash flooding are the main concerns from the strongest storms. Uttech .LONG TERM...(Monday Night through Sunday) ISSUED AT 300 PM CDT Sun Aug 28 2016 Monday night into Tuesday, a weak boundary and moist airmass will support more scattered showers and storms. Weak wind fields will likely result in more slow moving/backbuilding storms with localized heavy rainfall, but a low severe weather threat. Tuesday night into Wednesday, lingering storms are favored mainly south as the front clears out of the region. Mainly dry weather is forecast Wednesday night into Saturday as a large upper ridge pushes slowly east through the region. Expect cooler and slightly below normal temperatures late Wednesday into Friday, followed by another modest warm-up next weekend. The next wave may bring scattered showers and storms to the area late Saturday and Sunday. && .AVIATION...(For the 00Z TAFS through 00Z Monday Evening) ISSUED AT 646 PM CDT Sun Aug 28 2016 Isolated heavy thunderstorms appear likely to miss the eastern Iowa and northwest Illinois TAF sites but flying interests will certainly encounter these storms enroute, as they are located just west of the Mississippi river from southeast Iowa up through east central Iowa. Heavy rains and small hail could accompany any of these storms. By 02Z, dry weather will return to the region, with fog developing again overnight, which will be locally LIFR at times. Fog will clear our by 14 to 15Z Monday, and VFR conditions will return for the day. More scattered to isolated thunderstorms will be over the area again from late morning through evening Monday. ERVIN && .HYDROLOGY... Issued at 1118 AM CDT Sun Aug 28 2016 Rises on several area rivers are forecast to continue this week due to recent heavy rainfall. Increased confidence in the amount of routed water and recent hydrograph trends now support issuing flood watches for the Cedar River near Conesville, as well at the mainstem Mississippi River at Keithsburg, Gladstone, and Burlington. All points are forecast to rise above minor flood stage in the next 2 to 3 days, with later warnings likely if recent trends continue. Elsewhere, on the Wapsipinicon River near DeWitt, the forecast rise above flood stage is not expected until next Friday. Still do not have enough confidence to issue a watch for this point right now, due to a history of under-performing crests this summer. && .DVN Watches/Warnings/Advisories... IA...NONE. IL...NONE. MO...NONE. && SYNOPSIS...Uttech SHORT TERM...Uttech LONG TERM...RP Kinney AVIATION...Ervin HYDROLOGY...RP Kinney
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 324 PM CDT SUN AUG 28 2016 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-292030- 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- 324 PM CDT SUN AUG 28 2016 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 THUNDERSTORMS WILL CONTINUE THROUGH THIS EVENING. THE MAIN THREAT FROM THESE STORMS IS HEAVY RAIN AND LIGHTNING. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE ACROSS THE OUTLOOK AREA MONDAY AND TUESDAY BEFORE DIMINISHING ON WEDNESDAY. THE POTENTIAL FOR SEVERE WEATHER IS LOW. HOWEVER...LOCALIZED HEAVY RAINFALL WILL BE POSSIBLE WITH SLOW MOVING STORMS. RISES ON SEVERAL AREA RIVERS WILL CONTINUE THIS WEEK. MINOR FLOODING IS POSSIBLE ON PORTIONS OF THE CEDAR AND WAPSIPINICON RIVERS...AS WELL AS THE MISSISSIPPI DOWNSTREAM OF NEW BOSTON. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED THROUGH TONIGHT...ALTHOUGH REPORTS OF LOCALLY HEAVY RAIN ARE APPRECIATED. RP KINNEY
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA/IL 614 PM CDT SUN AUG 28 2016 IAC045-282345- CLINTON- 614 PM CDT SUN AUG 28 2016 ...A STRONG THUNDERSTORM WILL AFFECT WESTERN CLINTON COUNTY UNTIL 645 PM CDT... AT 614 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR CALAMUS...OR 12 MILES SOUTH OF MAQUOKETA. THE STORM IS NEARLY STATIONARY. WIND GUSTS UP TO 50 MPH ARE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... WHEATLAND...GRAND MOUND...DELMAR...LOST NATION...CALAMUS...WELTON... TORONTO...SHERMAN PARK...ELWOOD AND WALNUT GROVE PARK. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. LAT...LON 4177 9060 4178 9090 4201 9090 4201 9054 TIME...MOT...LOC 2314Z 179DEG 3KT 4189 9072 ERVIN
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
617 PM CDT SUN AUG 28 2016
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0615 PM HEAVY RAIN LOWDEN 41.86N 90.92W
08/28/2016 M1.32 INCH CEDAR IA CO-OP OBSERVER
IN 30 MINUTES
&&
DCSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA/IL 632 PM CDT SUN AUG 28 2016 IAC045-097-290000- CLINTON-JACKSON- 632 PM CDT SUN AUG 28 2016 ...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN CLINTON AND SOUTHWESTERN JACKSON COUNTIES UNTIL 700 PM CDT... AT 632 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR LOST NATION...OR 9 MILES SOUTH OF MAQUOKETA...MOVING NORTH AT 8 MPH. WINDS IN EXCESS OF 40 MPH ARE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... MAQUOKETA...DELMAR...LOST NATION...WELTON...MONMOUTH...TORONTO... NASHVILLE...BALDWIN...MAQUOKETA MUNICIPAL AIRPORT... WALNUT GROVE PARK...BUCKHORN...ELWOOD... EDEN VALLEY REFUGE AND JACKSON COUNTY FAIRGROUNDS. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. LAT...LON 4208 9058 4187 9060 4190 9090 4207 9090 TIME...MOT...LOC 2332Z 175DEG 6KT 4194 9073 ERVIN
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 706 PM CDT SUN AUG 28 2016 IAZ053-054-064>068-077-078-290215- JONES-JACKSON-JOHNSON-CEDAR-CLINTON-MUSCATINE-SCOTT-WASHINGTON- LOUISA- INCLUDING THE CITIES OF...ANAMOSA...MAQUOKETA...IOWA CITY... TIPTON...CLINTON...MUSCATINE...DAVENPORT...BETTENDORF... WASHINGTON...WAPELLO 706 PM CDT SUN AUG 28 2016 ...SLOW MOVING THUNDERSTORMS WITH HEAVY RAIN... A SLOW MOVING AREA OF THUNDERSTORMS WITH HEAVY RAIN WILL REMAIN OVER FAR EASTERN IOWA THROUGH 8 PM. WHILE SOME LOCATIONS MAY REMAIN DRY...PORTIONS OF MUSCATINE...CEDAR...CLINTON...JACKSON...AND SCOTT COUNTIES WILL CONTINUE TO SEE LOCALLY VERY HEAVY RAIN WITH 1 TO 3 INCHES POSSIBLE. THIS HEAVY RAIN WILL BRING MINOR FLOODING TO POORLY DRAINED AREAS AND CAUSE RISES ON AREA STREAMS. IF YOU ENCOUNTER WATER OVER A ROAD...DO NOT DRIVE INTO IT. ERVIN
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
836 PM CDT SUN AUG 28 2016
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0834 PM FLASH FLOOD OSCO 41.35N 90.28W
08/28/2016 HENRY IL LAW ENFORCEMENT
VEHICLE OFF THE ROAD ON ITS SIDE DUE TO WATER OVER THE
HIGHWAY.
&&
ERVINPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
926 PM CDT SUN AUG 28 2016
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0630 PM FLASH FLOOD LYNDON 41.72N 89.93W
08/28/2016 WHITESIDE IL LAW ENFORCEMENT
WATER OVER COUNTY ROAD. FIRE PAGED OUT TO CLOSE
ROAD...BUT IMPROVEMENT OCCURRED A SHORT TIME LATER. ROAD
IS NOW OPEN.
&&
ERVINThe Quad Cities radar (KDVN), 84 km away, was scanning. The volume nearest the first event began at 03:14 UTC.
2 flash flood. Local standard time, as filed.
A trained spotter reported that a nearby railroad tracks were completely washed out. A farmer that lived nearby reported more than 6 inches of rain. The time of the event was estimated using radar.
A trained spotter reported that 3.25 inches of rain had fallen and that water was over the County Road at there location.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2016Every state in 2016This day in weather historyWarnings in Iowa, August 2016
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: 658053, 658054.