Flooding along the Mississippi River that began in late April ended during the first week of May as the river went back into its banks.
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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.
Flooding along the Mississippi River that began in late April ended during the first week of May as the river went back into its banks.
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 Apr 30, 10:56 PM CST, 1 hour 4 minutes earlier.
Area Forecast Discussion National Weather Service La Crosse WI 1156 PM CDT Mon Apr 30 2018 .UPDATE... Issued at 808 PM CDT Mon Apr 30 2018 The Red Flag Warning and Wind Advisory have been allowed to expire. Gusty winds will continue through late evening. Relative humidity values will gradually improve into the late evening and overnight. UPDATE Issued at 332 PM CDT Mon Apr 30 2018 Will issue a Wind Advisory for portions of southeast MN and northeast IA through 00Z. Rochester, Dodge Center, and Austin are now solidly reporting winds above advisory threshold (30 mph gusts 45 mph) and with peak heating over the next few hours, could see some higher values before sunset. Expect southerly winds 25-35 mph with gusts to 45 mph. May even see some isolated gusts to 45 mph. && .SHORT TERM...(This evening through Tuesday) Issued at 215 PM CDT Mon Apr 30 2018 Cloud cover has helped limit deep mixing this afternon, keeping wind speeds in check and relative humidity up. A couple locations across southeast MN and northeast IA have briefly reported sustained winds above 30 mph, but this has been the exception. Most other areas have been in the 20 to 30 mph range. With more upstream cloud cover, don't think a Wind Advisory will be needed, but will continue to monitor observational trends. Will keep the Red Flag Warning for west-central WI until 7 PM. Relative humidity at Black River Falls is currently at 25 percent and with any clearing, this value could fall quickly along with increasing winds. See Fire Weather discussion below for additional details. For the rest of this evening into tonight, expect dry conditions, partly to mostly cloudy skies, and breezy southerly winds. This will result in warm overnight lows, only dropping into the mid 50s to lower 60s. A weak cold front will move slowly eastward on Tuesday, but is not expected to reach the western forecast area until 00Z Wednesday. While there could be a few elevated showers early in the day, not expecting much in the way of convection until late afternoon/ evening as the cold front works to break down a relatively strong mid-level cap. MUCAPE along and ahead of the front is around 1500 J/kg with deep layer shear near 30 kts. A few stronger storms are possible, but severe weather is not expected at this time. Highs Tuesday will be in the 70s to lower 80s with continued southwest breezes. Dew points in the 50s will keep minimum humidity values around 35 percent. .LONG TERM...(Tuesday night through Monday) Issued at 215 PM CDT Mon Apr 30 2018 Still some questions on how far south and east Tuesday's cold front will travel before stalling out somewhere across the region. As a result, shower/thunderstorm chances will continue Wednesday and Thursday with the highest chances generally south of I-90. Deep layer shear is more impressive, but the highest instability looks to be displaced farther south and east. Not expecting any severe weather at this time, but something to monitor over the next few days, especially if the surface boundary remains farther north. Highs for mid-week will be in the mid 60s to mid 70s with lows from the mid 40s to mid 50s. A stronger short-wave will move through the area Thursday night, ushering in a drier air mass to end the week. Friday/Saturday look dry, but a bit cooler with highs in the 60s to lower 70s. Models differ in timing of short-waves Sunday into Monday, so some low end POPs seem reasonable at this time with highs in the 60s. && .AVIATION...(For the 06Z TAFS through 06Z Tuesday night) Issued at 1156 PM CDT Mon Apr 30 2018 Main aviation concerns are on LLWS tonight then focus turns to showers and thunderstorms Tuesday afternoon into Tuesday evening with the potential for MVFR conditions. Also, any stronger storms may produce some small hail. while there may be some scattered showers and isolated storms earlier today, look for the more widespread shower and thunderstorm activity to move in after 21Z. && .HYDROLOGY... Issued at 215 PM CDT Mon Apr 30 2018 Flood warnings continue along stretches of the Mississippi River. While several rounds of rainfall are possible through the work week, the amounts will not be high enough to produce additional widespread flooding concerns. At this time, the flooding looks to be minor. See water.weather.gov for the specifics. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && UPDATE...Wetenkamp SHORT TERM...Rogers LONG TERM...Rogers AVIATION...Wetenkamp HYDROLOGY...Boyne
Hazardous Weather Outlook National Weather Service La Crosse WI 804 PM CDT Mon Apr 30 2018 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-011200- 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- 804 PM CDT Mon Apr 30 2018 This Hazardous Weather Outlook is for portions of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...Tonight Isolated thunderstorms are possible late tonight mainly over southeast Minnesota and northeast Iowa. Severe weather is not expected. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorms are possible at times across much of the area Tuesday through Thursday night. At this time, the risk for severe storms is low. Water levels will continue to rise along the Mississippi River through the work week, with minor flooding expected in some areas. Please visit water.weather.gov for the latest river forecast information. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Wetenkamp
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Flooding that began in late April along the Mississippi River at Wabasha ended in the first week of May. The river crested over a foot above the flood stage at 13.12 feet on May 1st.
Flooding that began in late April along the Mississippi River at Winona ended in the first week of May. The river crested less than a foot above the flood stage at 13.74 feet on May 2nd.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2018Every state in 2018This day in weather historyWarnings in Minnesota, May 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: 756992, 756993.