Scattered thunderstorms throughout the forecast area were in a favorable environment for severe winds. Through the afternoon, a few microbursts were noted, resulting in sporadic tree damage.
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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.
Scattered thunderstorms throughout the forecast area were in a favorable environment for severe winds. Through the afternoon, a few microbursts were noted, resulting in sporadic tree damage.
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 4, 2:03 PM CST, 1 hour 2 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Quad Cities IA IL 303 PM CDT Tue Jun 4 2024 .KEY MESSAGES... - There is a Marginal or level 1 out of 5 risk of severe storms this afternoon into tonight. The main threat will be isolated damaging wind gusts and lightning. - A moist air mass is in place across the area resulting in the potential for heavy rainfall. This results in a localized flash flooding concern into tonight, especially in urban areas. - A pattern change toward the end of the week will result in below normal temperatures this weekend into early next week. && .SHORT TERM /THROUGH WEDNESDAY/... Issued at 249 PM CDT Tue Jun 4 2024 An MCV is evident on satellite and radar lifting into southeast Iowa this afternoon. There is 1000 to 2000 J/KG of surface based CAPE. Deep layer shear across the area is 15 to 20 knots. It also showing precipitable water around 1.50 inches. Temperatures have warmed into the upper 70s to lower 80s. Dewpoints are in the mid to upper 60s. In the near term, the MCV is forecast to lift northeastward to near the Interstate 80 corridor through 7 PM this evening. There is an area of surface vorticity and convergence located from Jasper County southeastward into Jefferson and Van Buren County. CAMs show scattered showers and storms developing and lifting northward into the early evening. 0 to 6 km shear is borderline at 15 to 20 knots. Think that a wet microburst is possible given deep moisture sounding profiles across the area and weak flow. Precipitable water is 1.4 to 1.8 inches leading to heavy rainfall and potential for localized flash flooding. A second round of showers and storms are forecast to develop ahead of a cold front that will move across the area later tonight. Instability will diminish as these storms move into the area and expect this line of showers and storms to be decaying as it moves across the area between 3 and 12 UTC. Any severe threat will be limited. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... Issued at 249 PM CDT Tue Jun 4 2024 Wednesday night Assessment...Medium confidence Early Wednesday morning there may or may not be some lingering showers in the far east and northeast areas. Any rain present will exit the area by mid-morning leaving the remainder of the morning dry. A secondary cold front and an attendant upper level disturbance will move through the area during the late afternoon and evening hours. Forcing from the front and upper level disturbance should be enough to generate isolated showers and possibly a few thunderstorms. Overall coverage will be low at 20-25 percent. Most locations will only see an increase in clouds along with a wind shift during the frontal passage. Thursday through Friday night Assessment...high confidence of dry conditions Northwest flow aloft will be well established by late week with high pressure moving through the Midwest. Temperatures should be slightly below normal. Saturday Assessment...low to medium confidence for rain chances All models show a weak upper level disturbance moving through in the flow aloft. The question, given northwest flow, is will there be enough moisture present to produce any precipitation. Most deterministic model runs indicate dry conditions. However, there are some ensemble members from the respective models that do generate some light precipitation. The model consensus of the deterministic and ensembles generates low coverage pops (20 percent) during the day Saturday. Thus the overall message is that most of the area will remain dry on Saturday. There is much higher confidence that temperatures will be slightly below normal. Saturday night through Monday Assessment...medium to high confidence The model consensus has dry conditions for the area along with temperatures slightly below normal. There will be weak disturbances in the flow aloft moving through the area. If there is sufficient moisture available, one cannot fully rule out some rogue diurnal showers occurring. If this scenario does occur, coverage would be low (20 percent at best). && .AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 1247 PM CDT Tue Jun 4 2024 A disturbance is forecast to lift across eastern Iowa TAF sites this afternoon prior to 00 UTC with scattered showers and isolated storms. The confidence is low on coverage so used VCSH at all TAF sites for mainly the 20 to 24 UTC timeframe. A second disturbance and cold front will move across the area tonight with a line of weakening showers and thunderstorms moving across the area. MVFR visibilities are possible in the strongest showers and storms tonight. Winds behind the cold front will switch to the west. Showers will end by 12 UTC with skies clearing and VFR conditions prevailing. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...None. IL...None. MO...None. && SHORT TERM...Cousins LONG TERM...08 AVIATION...Cousins
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 338 AM CDT Tue Jun 4 2024 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-050845- 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- 338 AM CDT Tue Jun 4 2024 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 The Storm Prediction Center has a marginal risk, or level 1 out of 5 risk, across the entire area. Scattered thunderstorms are expected from late morning through tonight. Some storms may be severe this afternoon and evening, with damaging winds being the primary risk and hail as a secondary risk. Locally heavy rainfall could pose a risk for isolated flash flooding this afternoon and tonight, especially in urban areas. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... GENERAL STORM MOTION OF THE DAY: To the north at 25 mph through sunset. Tonight to the east at 30 mph.
The Quad Cities radar (KDVN), 3 km away, was scanning. The volume nearest the first event began at 21:06 UTC.
2 thunderstorm wind. Local standard time, as filed.
Three inch tree branches downed by the thunderstorm winds.
Broadcast media estimated a wind gust around 60 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2024Every state in 2024This day in weather historyWarnings in Iowa, June 2024
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: 1191072, 1191071.