Severe thunderstorms developed along a warm front during the afternoon and evening, bringing a few reports of strong damaging winds, and heavy downpours.
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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.
Severe thunderstorms developed along a warm front during the afternoon and evening, bringing a few reports of strong damaging winds, and heavy downpours.
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 May 10, 2:09 PM CST, 3 hours 26 minutes earlier.
Area Forecast Discussion National Weather Service Quad Cities IA IL 309 PM CDT Wed May 10 2017 .SYNOPSIS... Issued at 305 PM CDT Wed May 10 2017 Severe weather event underway with Severe Thunderstorm Watch #203 generally along and south of I80 through 8 PM CDT. Latest sfc analysis suggests the main warm front located from near Fairfield IA, to Burlington, and to south of Monmouth in west central IL. LLVL CAPE and baroclinicity gradients draped from west-to-east acrs the southern third of the DVN CWA and highway for enhanced convective swaths through early evening. Then drier pattern for end of the week into the weekend, with a warm up on the way as the weekend progresses. Then the latest run medium range models still advertising a warmer, more summer like pattern next week with the convective storm track laying out in or near the DVN CWA at times. && .SHORT TERM...(This Evening through Thursday) ISSUED AT 305 PM CDT Wed May 10 2017 Tonight...As mentioned above, severe event ongoing generally along and especially south of I80 in more favorable shear combined with adequate thermodynamics. Some impressive 0-3KM SRH values currently migrating out of south central IA into southeastern IA combined with 1000-2000 J/KG CAPES. Locally heavy rainfall of 1-2 inches and flash flooding also a possibility. Then several of the latest HiRes solutions/CAM's continue with their trends of progressing most of the organized convection east and southeast of the DVN CWA by 00z- 01z. Just lingering light showers and lowering cloud bases behind this activity acrs much of the CWA overnight. Many of the models also have trended further south acrs MO with main cold front and wake llvl cool pool that the nocturnal LLJ will impinge on. Thus this heavier overnight convection and heavy rain/flooding threat may lay out ideally south of our area of concern acrs central MO. Locally more in the way of post-frontal cooling north-northeast sfc flow, clouds and lingering pockets of lighter rain or showers. Thursday...With more progressive southward surge of the main front and boundary layer northerly flow push, there may not be much in the way of lingering overrunning showers even in the southern CWA after mid morning. Lingering elevated thunder threat also appears to be shifting to the south. Fcst highs banking on some thinning of the overcast especially along and north of I80. .LONG TERM...(Thursday Night through next Wednesday) ISSUED AT 305 PM CDT Wed May 10 2017 After an active Wednesday into early Thursday, look for mainly quiet weather heading into the weekend. Thursday night through Tuesday...After the upper level trough and cold front move through the region Thursday, expect upper level ridging and surface high pressure to gradually build across the middle Mississippi River Valley beginning on Friday. On Saturday morning, the GFS, NAM and Canadian are trying to hint at some light sprinkles or rain showers across the far east CWA as a jet streak rounds the back of the upper level trough. However, moisture appears to lack consistency at all levels, so will likely only end up with cloud cover. Nonetheless, expect mostly sunny skies through the weekend and early next week, with high temperatures gradually warming into the upper 70s and lower 80s as winds become southerly and upper level heights increase. Tuesday on...Models begin to diverge on possible scenarios beginning in this period. Consistency does exist, however, on things becoming active as series of upper level shortwaves and troughs impact our region beginning Tuesday. At this time, the potential does exist for showers and thunderstorm development as there is indication of decent Gulf moisture transport and decent buoyancy. It's too early for talk of severe weather, but this potential will need to be monitored in the coming days. && .AVIATION...(For the 18Z TAFS through 18Z Thursday Afternoon) ISSUED AT 1239 PM CDT Wed May 10 2017 Busy aviation forecast as thunderstorms will affect many of the sites in the next six hours, some of these storms will be severe with damaging winds, hail and tornadoes all possible. IFR cigs and even some vsbys are possible in the heavier rain. After the convective weather, expect a wind shift, slightly cooler temps and with it, the chance for MVFR and possibly IFR cigs. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && SYNOPSIS...Gibbs/12 SHORT TERM...Gibbs/12 LONG TERM...12/Speck AVIATION...Gibbs
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 455 AM CDT Wed May 10 2017 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-111000- 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- 455 AM CDT Wed May 10 2017 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 Severe thunderstorms are possible across much of the outlook area this afternoon and evening. The Storm Prediction Center has a placed a slight risk over the area roughly south of a line from Independence Iowa to Freeport Illinois. Scattered thunderstorms will move through eastern Iowa and northwest Illinois this morning. These are not expected to be severe, but may produce locally heavy downpours, frequent lightning and small hail. Thunderstorms are expected to redevelop this afternoon and continue into this evening. Some of these may be severe, with a threat of large hail, damaging winds and a few tornadoes. The initial severe weather threat will be associated with supercell thunderstorms over eastern Iowa and northwest Illinois after 2 pm. These will be closely linked to the location of a warm front, which remains uncertain at this time. From late afternoon into the evening, more widespread coverage of thunderstorms is expected ahead of an advancing cold front. In addition to the continued potential for severe weather, these storms may also produce locally heavy rainfall and a threat of flash flooding. Area rivers are experiencing flooding. Please see the latest Flood Statements and Flood Warnings for details. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening. Sheets
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
545 PM CDT WED MAY 10 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0544 PM HEAVY RAIN 4 W MOUNT PLEASANT 40.97N 91.63W
05/10/2017 M2.09 INCH HENRY IA TRAINED SPOTTER
TOTAL THROUGH 545 PM
&&
ERVINPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
551 PM CDT WED MAY 10 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0551 PM HEAVY RAIN 3 SSW CENTER JUNCTION 42.08N 91.11W
05/10/2017 M1.30 INCH JONES IA TRAINED SPOTTER
RAINFALL SINCE 915AM
&&
PETERSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
552 PM CDT WED MAY 10 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0546 PM TSTM WND DMG 5 WSW MACOMB 40.44N 90.77W
05/10/2017 MCDONOUGH IL TRAINED SPOTTER
TREE BLOWN DOWN, ONTO HOME ROOF.
&&
ERVINPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
605 PM CDT WED MAY 10 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0535 PM TSTM WND DMG MACOMB 40.47N 90.68W
05/10/2017 MCDONOUGH IL TRAINED SPOTTER
TREE DOWN ON POWER POLE ON MAPLE AVE NEAR THE HIGH
SCHOOL, TIME ESIMATED ON RADAR.
&&
PETERSPRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
611 PM CDT WED MAY 10 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0545 PM TSTM WND DMG MACOMB 40.47N 90.68W
05/10/2017 MCDONOUGH IL TRAINED SPOTTER
TREE DOWN ON POWER POLE ON MAPLE AVE NEAR THE HIGH
SCHOOL, TIME ESIMATED ON RADAR.
&&
PETERSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
629 PM CDT WED MAY 10 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0620 PM HEAVY RAIN 1 W BETTENDORF 41.56N 90.49W
05/10/2017 M1.76 INCH SCOTT IA TRAINED SPOTTER
RAINFALL SO FAR TODAY...0.77 INCHES SINCE 430 PM
0620 PM HEAVY RAIN 4 N MARENGO 41.85N 92.07W
05/10/2017 M1.25 INCH IOWA IA TRAINED SPOTTER
0530 PM HEAVY RAIN LOWDEN 41.86N 90.92W
05/10/2017 M1.52 INCH CEDAR IA CO-OP OBSERVER
RAINFALL IN THE PAST 8 HOURS.
0545 PM HEAVY RAIN 5 E CANTRIL 40.64N 91.98W
05/10/2017 M1.00 INCH VAN BUREN IA TRAINED SPOTTER
RAINFALL TODAY.
0502 PM TSTM WND GST MONMOUTH 40.91N 90.64W
05/10/2017 E50 MPH WARREN IL PUBLIC
TIME ESTIMATED FROM RADAR.
&&
GROSSThe Lincoln radar (KILX), 119 km away, was scanning. The volume nearest the first event began at 23:34 UTC.
3 thunderstorm wind. Local standard time, as filed.
A trained spotter reported a tree down on a power pole on Maple Avenue near the high school.
A trained spotter reported a tree blown down, onto the roof of a home.
The county emergency manager reported two tall pine trees were uprooted at a residence near the county line.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2017Every state in 2017This day in weather historyWarnings in Illinois, May 2017
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: 703083, 703085, 703082.