A decaying line of thunderstorms produced some damaging wind gusts across portions of northeast Iowa during the morning of June 2nd. Trees and power lines were blown down near Osage (Mitchell County), Cresco (Howard County) and Charles City (Floyd County).
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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 ARX wrote it up.
A decaying line of thunderstorms produced some damaging wind gusts across portions of northeast Iowa during the morning of June 2nd. Trees and power lines were blown down near Osage (Mitchell County), Cresco (Howard County) and Charles City (Floyd 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 La Crosse, WI wrote its last area forecast discussion before the first event at Jun 2, 5:22 AM CST, 2 hours 52 minutes earlier.
Area Forecast Discussion National Weather Service La Crosse WI 622 AM CDT Sat Jun 2 2018 .SHORT TERM...(Today through Monday Night) Issued at 226 AM CDT Sat Jun 2 2018 Pretty quiet at the moment with a notable drop in dew points early this morning courtesy of low level southeasterly flow, while just to our west it's a much different story with a long-lived convective complex rolling east/southeast out of Nebraska the past few hours. That latter feature is ahead of a robust negative-tilt upper trough emerging east across the northern Plains, with said upper wave on its way in our direction by late afternoon. The trouble over this way is instability; simply put, we're lacking it. Given the minimum in elevated CAPE, expect that convective complex to the west to ride the better instability axis into southern Iowa and northern Missouri the next few hours, with the northern fringe weakening as it approaches our area. That setup then leaves questions heading into the afternoon with regard to how much additional instability we can build this far north. Will be watching low cloud potential across northern areas per current satellite trends, as well as the likelihood for additional remnant cloud cover from decaying convection, though we may have some room to sneak in up to 750-1000 J/kg elevated CAPE pending some breaks in the cloud cover in advance of the upper trough. 0-3/0-6km shear right ahead of the upper wave isn't terrible, sitting around 30 knots in the presence of some decent mid level lapse rates, so will have to watch some sneaky potential for a few stronger storms, though would obviously like to see better instability for an organized severe weather threat. Given the strength of the upper trough, would think many areas still have good chances for some rain today and going high PoPs look very reasonable. Things quiet down quickly by late evening and into Sunday with a notably drier and cooler airmass again working back into the area as low level ridging drifts just to the west. Should be a decently breezy day Sunday as well given 30+ knots in the mixed layer and steep low level lapse rates with ongoing cold advection, with breezy conditions again on Monday but with warmer temps given a switch to westerly low level flow and increased warm advection. Not ready to buy into GFS depiction of convection firing Monday night across parts of the area as that model's dew point regime looks pretty aggressive (dew points into the mid 60s), though there are hints of a better shortwave clipping the northern Great Lakes during that time with some better shower chances to our east. .LONG TERM...(Tuesday through Friday) Issued at 226 AM CDT Sat Jun 2 2018 Upper ridging still progged to amplify northward into the region for mid and late week, with that ridge axis periodically topped by weaker pieces of hard-to-time shortwave energy. From a basic pattern standpoint, the setup would support occasional shower and storm chances from Wednesday onward, though obviously confidence isn't the highest at this juncture, nor is this forecaster's confidence in high temperatures any given day with plenty of unknowns (clouds, precip, etc.). However, looking like an overall stretch of near to above normal temperatures once again, though with still some lingering questions about just how amplified the upper ridge will be this far north. Stay tuned. && .AVIATION...(For the 12Z TAFS through 12Z Sunday morning) Issued at 622 AM CDT Sat Jun 2 2018 A period of MVFR ceilings may impact KLSE for a time this morning as a stratus deck advects westward. A weakening band of primarily showers will approach KRST later this morning, and some MVFR ceilings could accompany the showers if they reach KRST. Additional scattered showers/storms are expected from mid afternoon through early evening as a cold front approaches. Maintained VCTS wording, although more detail may be added as confidence increases. IFR/MVFR conditions are possible with any showers/storms. A return to VFR conditions is expected during the evening with skies clearing behind the front. East to southeast winds gusting at times to around 20 kts, especially at KRST, will become southerly through the day before becoming northwest behind the front tonight. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && SHORT TERM...Lawrence LONG TERM...Lawrence AVIATION...JM
Hazardous Weather Outlook National Weather Service La Crosse WI 247 AM CDT Sat Jun 2 2018 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-031200- Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette- Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston- Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau- Adams-Vernon-Crawford-Richland-Grant- 247 AM CDT Sat Jun 2 2018 This Hazardous Weather Outlook is for portions of southeast Minnesota, northeast Iowa, and southwest into central Wisconsin. .DAY ONE...Today and Tonight A few thunderstorms are possible this morning, mainly across southeast Minnesota into northeast Iowa. The main threat from these storms will be lightning. Additional scattered thunderstorms are expected areawide this afternoon and early evening. A few stronger storms are possible, producing gusty winds and small hail but widespread severe storms are unlikely. .DAYS TWO THROUGH SEVEN...Sunday through Friday Periodic chances for thunderstorms are expected Tuesday night through Friday. At this time, the main risk with any storms appears to be lightning. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Lawrence
Special Weather Statement National Weather Service La Crosse WI 904 AM CDT Sat Jun 2 2018 IAZ008-018-MNZ094-021515- Mitchell-Floyd-Mower- Including the cities of Osage, Charles City, and Austin 904 AM CDT Sat Jun 2 2018 ...Strong Winds Possible in Floyd, Mitchell, and Mower Counties... Strong easterly winds up to 50 mph are possible on the back side of departing showers and thunderstorms. Gusts of 60 to 70 mph have been reported from Mason City to Hampton, with some damage reported. If you experience strong wind gusts be prepared to take shelter. CA
The national radar mosaic for the moment the first event began.
4 thunderstorm wind. Local standard time, as filed.
Trees were blown down, a street signal broken, and tree limbs went down on power lines in Charles City.
Power lines and tree limbs were blown down near New Haven.
Power lines and tree limbs were blown down near Osage.
Trees were blown down in Cresco.
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, June 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 2026-09-24. Each event’s entry at NCEI: 757836, 757837, 757838, 757839.