After several heavy rain events in June across the Upper Midwest, floodwaters worked down the Mississippi River. Flooding occurred in late June at McGregor and Guttenberg (Clayton County).
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 ARX wrote it up.
After several heavy rain events in June across the Upper Midwest, floodwaters worked down the Mississippi River. Flooding occurred in late June at McGregor and Guttenberg (Clayton 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 25, 10:41 PM CST, 1 hour 44 minutes earlier.
Area Forecast Discussion National Weather Service La Crosse WI 1141 PM CDT Mon Jun 25 2018 .SHORT TERM...(Tonight through Tuesday) Issued at 143 PM CDT Mon Jun 25 2018 Relatively quiet today as high pressure over the Great Lakes was exerting its influence on our forecast area. Under mostly to partly sunny skies, temperatures this afternoon ranged from the middle 70s to near 80. For tonight, closed low over the Central Plains will move into northern IA This will spread showers and scattered thunderstorms into northeast IA/southeast MN by later this evening and then east of the Mississippi River after midnight. Some of this rainfall could be locally heavy at times as increasing 925-850mb moisture transport push precipitable into the 1.25-1.75 inch range. Showers and storms continue Tuesday as the low spins overhead. Was concerned yesterday for the potential of organized severe storms, but latest model trends have better shear profiles farther south of the area across central IA into Illinois. On the otherhand, localized heavy rain potential still exists over us as precipitable values max out in the 1.5 to 2 inch range. Will have to watch this closely given moist soils and elevated river levels. The low pulls and bulk of showers/storms pull off to the east Tuesday evening with rain pretty much out of the area around midnight or soon after. .LONG TERM...(Tuesday night through Monday) Issued at 143 PM CDT Mon Jun 25 2018 Main forecast concerns in the long term are on building heat late this week into the weekend. Thunderstorm chances also return this weekend. Weak high pressure moves across the Upper Mississippi River Valley on Wednesday with quiet weather expected. Upper level ridging then builds over the region with building heat Thursday into Friday along with increasing southerly flow at the surface. NAEFS Mean 850 mb temperatures climb to 24 to 25 C. This produces an 850 mb standardized anomalies of 2 to 2.5 across much of the area, so it's going to be hot. Surface temperatures are expected to climb into the upper 80s to mid 90s. Dew points will be in the lower 70s. The combination of these hot temperatures and higher dew points will lead to afternoon and early evening heat index readings of 95 to 105. A heat advisory may be needed. Looking ahead to the weekend, shower and thunderstorm chances return. It looks more active, but it's difficult to determine if there would be a severe weather threat at this time. The most likely timeframe for showers and storms appears to be late Saturday afternoon through Sunday. Saturday will be another very warm and humid day with afternoon heat index readings in the 90s to near 100. && .AVIATION...(For the 06Z TAFS through 06Z Tuesday night) Issued at 1140 PM CDT Mon Jun 25 2018 The first round of showers is just starting to move into northeast Iowa late this evening. As the upper level low continues to move across Iowa overnight, the forcing will continue to slowly increase allowing a couple rounds of showers and possible a few storms to move over the area. Initially conditions will be VFR, but these will diminish to MVFR with some IFR ceilings possible late tonight into Tuesday morning. Most of the showers should be east of both airports by late Tuesday afternoon as the upper level low moves over southern Wisconsin, but look for ceilings to remain MVFR into Tuesday evening. Do not plan to include any thunder as the CAPE looks to be very limited with this system. There could be some embedded thunder though with the showers that may require this to be added with later updates. && .HYDROLOGY... Issued at 143 PM CDT Mon Jun 25 2018 Minor flooding will continue along the Mississippi River through this week. See the latest flood statements for current river forecasts on our web site at www.weather.gov/lacrosse. The potential for heavier rainfall exists tonight into Tuesday as a slow moving storm system spreads showers and storms into our area. Precipitable water values of 1.5-2 inches will allow for the potential of heavy downpours/rainfall from any shower or storm. With the already moist soils from recent rains...river rises are expected along with the possibility of some localized flooding. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && SHORT TERM...DAS LONG TERM...Wetenkamp AVIATION...04 HYDROLOGY...DAS
Hazardous Weather Outlook National Weather Service La Crosse WI 221 AM CDT Mon Jun 25 2018 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-261100- 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- 221 AM CDT Mon Jun 25 2018 This Hazardous Weather Outlook is for portions of northeast Iowa...southeast Minnesota and southwest into central Wisconsin. .DAY ONE...Today and Tonight Scattered thunderstorms tonight. Severe weather is not expected. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday More storms Tuesday into Tuesday night. A few may be strong, potentially severe, across northeast Iowa and southwest Wisconsin. The main threats will be damaging winds, large hail, and maybe an isolated tornado. Locally heavy rain also possible. There are small thunderstorm chances Thursday night into the weekend. It is too early discern if there would be a severe threat. On Friday afternoon and evening, heat indices will range from 95 to 105. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Boyne
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Runoff from heavy rain events pushed the Mississippi River out of its banks at McGregor. The river crested almost a foot above the flood stage at 16.85 feet on the 27th. The flooding continued into early July.
Runoff from heavy rain events pushed the Mississippi River out of its banks at Guttenberg. The river crested just over the flood stage at 15.04 feet on the 28th.
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: 765523, 765524.