A passing disturbance combined with afternoon heating to fire afternoon and early evening thunderstorms with some storms becoming severe. Several reports of damaging winds over 60 mph were reported along with a couple of large hail events.
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 passing disturbance combined with afternoon heating to fire afternoon and early evening thunderstorms with some storms becoming severe. Several reports of damaging winds over 60 mph were reported along with a couple of large hail events.
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 Jul 5, 5:39 PM CST, 46 minutes earlier.
Area Forecast Discussion National Weather Service Quad Cities IA IL 639 PM CDT Wed Jul 5 2017 ...00z AVIATION UPDATE... .SYNOPSIS... Issued at 300 PM CDT Wed Jul 5 2017 Isolated showers and brief thunderstorms have randomly popped up across the cwa. Meanwhile, a stratiform area of light rain/sprinkles have pushed into our far southern cwa. Cloud cover is a bit more extensive compared to yesterday and there is little if any downdraft CAPE. Yesterday there was decent downdraft CAPE which allowed for gusty thunderstorm outflow winds of around 40 mph. Similar to yesterday, there is little to no shear. The bottom line is most of the popcorn showers or storms will be garden variety, and when they become precipitation-loaded they diminish quickly (due to the lack of shear). So far the convection does not look as vigorous as the past couple of afternoons. Mid-afternoon temperatures across the cwa were in the 80s with dewpoints in the upper 60s to lower 70s. Heat index values were as high as the lower 90s. && .SHORT TERM...(This Evening through Thursday) ISSUED AT 300 PM CDT Wed Jul 5 2017 Hot and humid on Thursday. Late afternoon into early this evening: Isolated showers and storms will gradually diminish and end with loss of heating. I suspect the activity to end by 8 or 9 pm. Most of the activity will be garden variety. Overnight: A rather warm and humid night under clear to partly cloudy skies. Lows will be in the mid to upper 60s. Thursday: A hot and humid day with plenty of sunshine and a capped atmosphere (which will suppress convection). Models indicate the warm ridge axis (hot prod) to push across the cwa, ahead of a rather strong cold front pushing southeast into MN and WI. 850 mb temperatures of at least +20C will yield afternoon surface temperatures in the upper 80s to lower 90s. With dewpoints around 70 the heat index values should soar into the mid 90s at most locations. A few spots may hit upper 90s briefly but this is still below heat advisory criteria. .LONG TERM...(Thursday Night through Wednesday) ISSUED AT 300 PM CDT Wed Jul 5 2017 Thursday Night The Storm Prediction Center has continued a slight risk for severe storms along and north of highway 34. However, confidence regarding areal coverage of storms is low because appreciable 500mb height falls (and attendant forcing) are forecast to pass well to the N/NE of E Iowa/NW Illinois. The best chances for scattered storms are across the NE sections of the forecast area. But even in these areas, PoPs are relatively low between 20-30%. MUCAPE of +2000 J/kg and moderate deep layer shear (+40 kts) are supportive of organized multicell clusters with damaging winds as the primary risk. Storm motion Corfidi vectors are oriented to the SSE. The sfc theta-e and 1000-500mb thickness contours follow a similar path. The 12Z run of the 3 km NAM drops a broken line of storms into mainly the NE portion of the CWA after 8 or 9 PM, which seems like a reasonable solution. The greatest forecast uncertainty exists with how far south and west the convection reaches before it dissipates. Again, there is low confidence on anything greater than scattered coverage across most of the forecast area. Friday and Saturday High pressure in control across the Upper Midwest for the end of the week and first half of the weekend. It will be much less humid behind the Thursday night cold front. Dewpoints in the upper 50s to lower 60s will be a welcomed break from the muggy lower 70s we've experienced the past several days. Recent model runs show a weak cold front moving into the forecast area from the NW on Saturday, then stalling out through the rest of the weekend. For this reason, there are low chances for showers and storms beginning Saturday evening and night. Sunday through Wednesday Sfc high progged to translate into the Eastern U.S. leading to warming temps, increasing low-level moisture (dewpoints well into the 60s to lower 70s), and periodic chances for thunderstorms. While it is too early to delve into the specifics, models are indicating sufficient deep layer shear and at least moderate instability persisting on the eastern periphery of the Western U.S. expansive upper ridge. A strong 850mb baroclinic zone and NW flow aloft could result in an active MCS track through the Midwest, and the potential for several episodes of strong or severe thunderstorms. Uttech && .AVIATION...(For the 00Z TAFS through 00Z Thursday Evening) ISSUED AT 621 PM CDT Wed Jul 5 2017 Widely scattered showers and storms will diminish with sunset leaving behind clear to partly cloudy skies the rest of tonight. Will continue to monitor for development next 1-2 hrs near terminals and amend if needed. Late tonight will bring the potential for some MVFR fog with near calm winds and abundant low level moisture. On Thursday, weak ridging and a capping inversion aloft will likely preclude any PM storms, thus VFR conditions with light winds becoming Swly 5-10 kts. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && SYNOPSIS...Haase SHORT TERM...Haase LONG TERM...Uttech AVIATION...McClure
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 1141 AM CDT Wed Jul 5 2017 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-061645- 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- 1141 AM CDT Wed Jul 5 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...THIS AFTERNOON AND TONIGHT This afternoon into early this evening...Isolated to scattered thunderstorms can be expected. A few of the stronger storms may produce wind gusts to 40 MPH and small hail. Thunderstorms will also be slow moving and produce localized rainfall of an inch or two in a short time. Heat index values will push into the lower 90s at many locations this afternoon, but a few spots may see mid 90s. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY Thursday afternoon...heat index values will soar into the mid 90s at many locations, but upper 90s are possible. There is a chance of thunderstorms Thursday evening and overnight. The Storm Prediction Center has a slight risk for severe storms across much of the outlook area. The main risk will be damaging winds and large hail. There is a chance for thunderstorms early next week. However, it is too early to determine the severe weather risk. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed this afternoon or tonight. Haase
Special Weather Statement National Weather Service Quad Cities IA/IL 512 PM CDT WED JUL 5 2017 IAC163-052245- Scott- 512 PM CDT WED JUL 5 2017 ...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN SCOTT COUNTY UNTIL 545 PM CDT... At 512 PM CDT, a strong thunderstorm was located near Donahue, or 11 miles northeast of Durant, moving south at 10 mph. Winds in excess of 40 mph and nickel size hail are possible with this storm. Locations impacted include... Dixon, Maysville and Plainview. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 4174 9071 4162 9067 4163 9083 4174 9079 TIME...MOT...LOC 2212Z 001DEG 10KT 4170 9074 MCCLURE
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
513 PM CDT WED JUL 05 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0508 PM HAIL S MACOMB 40.47N 90.68W
07/05/2017 M0.50 INCH MCDONOUGH IL TRAINED SPOTTER
TORRENTIAL RAIN WITH PEA TO MARBLE SIZED HAIL.
&&
DCSpecial Weather Statement National Weather Service Quad Cities IA/IL 543 PM CDT WED JUL 5 2017 ILC131-161-052315- Rock Island-Mercer- 543 PM CDT WED JUL 5 2017 ...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL ROCK ISLAND AND NORTH CENTRAL MERCER COUNTIES UNTIL 615 PM CDT... At 543 PM CDT, a strong thunderstorm was located over Hamlet, or 8 miles north of Aledo, moving southwest at 15 mph. Winds in excess of 40 mph and nickel size hail are possible with this storm. Locations impacted include... Reynolds, Hamlet, Gingle Corners, Aledo Mercer County Airport and Marston. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 4139 9069 4132 9061 4121 9077 4136 9094 TIME...MOT...LOC 2243Z 062DEG 15KT 4132 9072 MCCLURE
Special Weather Statement National Weather Service Quad Cities IA/IL 556 PM CDT WED JUL 5 2017 ILC177-052330- Stephenson- 556 PM CDT WED JUL 5 2017 ...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN STEPHENSON COUNTY UNTIL 630 PM CDT... At 555 PM CDT, a strong thunderstorm was located near Ridott, or near Freeport, moving southwest at 10 mph. Winds in excess of 40 mph and dime size hail are possible with this storm. Those attending the Stephenson County Fair are in the path of this storm and should prepare for the expected weather conditions. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 4236 8951 4230 8941 4221 8956 4228 8968 TIME...MOT...LOC 2255Z 053DEG 10KT 4230 8954 MCCLURE
Special Weather Statement National Weather Service Quad Cities IA/IL 714 PM CDT WED JUL 5 2017 ILC071-187-IAC057-060045- Henderson-Warren-Des Moines- 714 PM CDT WED JUL 5 2017 ...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL HENDERSON... NORTHWESTERN WARREN AND SOUTHEASTERN DES MOINES COUNTIES UNTIL 745 PM CDT... At 713 PM CDT, radar indicated strong thunderstorms were located along a line extending from near Burlington to 6 miles west of Galesburg. Movement was south at 10 mph. Winds in excess of 30 mph and half inch hail are possible with these storms. Locations impacted include... Burlington, Monmouth, West Burlington, Kirkwood, Carman, Biggsville, Gladstone, Gulf Port, Lone Tree, Ormonde, Carthage Lake, Gerlaw, Shokokon, Heapsville, Monmouth Municipal Airport, Burlington Regional Airport, Olena, Des Moines County Fairgrounds, Eleanor and Hopper. Torrential rainfall is also occurring with these storms, and may cause localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 4070 9112 4086 9055 4104 9059 4081 9119 TIME...MOT...LOC 0013Z 356DEG 9KT 4078 9111 4098 9050 MCCLURE
Special Weather Statement National Weather Service Quad Cities IA/IL 720 PM CDT WED JUL 5 2017 MOC199-060045- Scotland- 720 PM CDT WED JUL 5 2017 ...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN SCOTLAND COUNTY UNTIL 745 PM CDT... At 719 PM CDT, a strong thunderstorm was located near Downing, or 8 miles northwest of Memphis, moving south at 20 mph. Winds in excess of 40 mph and nickel size hail are possible with this storm. Locations impacted include... Memphis, Crawford, Brock, Hitt, Memphis Memorial Airport, Scotland County Fairgrounds and Kilwinning. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 4060 9235 4060 9215 4038 9214 4037 9235 TIME...MOT...LOC 0019Z 017DEG 17KT 4055 9228 MCCLURE
The Quad Cities radar (KDVN), 100 km away, was scanning. The volume nearest the first event began at 00:26 UTC.
6 thunderstorm wind, 2 hail. Local standard time, as filed.
A trained spotter reported two 6 to 8 inch diameter trees were blown down that were partially rotted. The time of this event was estimated by radar.
A public report was received of hail between 0.50 up to 1.0 inch in diameter. This report was relayed by the county emergency manager.
A public report was received of 20 to 30 trees down across town. This report was relayed by the emergency manager.
This wind gust was measured by the Monticello AWOS site.
A trained spotter reported multiple trees and limbs were down on the north side of Anamosa. Some of the trees came down on power lines. The spotter also reported pea to dime sized hail.
The county emergency manager reported trees, limbs and power lines down in Anamosa. Three homes were damaged by trees falling on them.
Local law enforcement reported large tree branches down on power lines near the intersection of Covington Road and Lone Tree Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2017Every state in 2017This day in weather historyWarnings in Iowa, July 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: 715240, 715241, 715243, 715244, 715245, 715246, 715247, 715248.