A funnel cloud was reported for several minutes near the community of Monona (Clayton County).
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The episode as NWS ARX wrote it up.
A funnel cloud was reported for several minutes near the community of Monona (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 Aug 6, 1:20 PM CST, 20 minutes earlier.
Area Forecast Discussion National Weather Service La Crosse WI 220 PM CDT Sun Aug 6 2017 .SHORT TERM...(Tonight through Tuesday) Issued at 220 PM CDT Sun Aug 6 2017 Series of ripples in the upper level flow will track eastward across parts of the region tonight/Monday. For the rest of the afternoon/evening, instability north of the cloud shield will help spark scattered showers/isold storms north of I-90, with mostly shortwave energy triggering continued shower (maybe a storm?) south of there. Expect most of the activity to wane by mid evening. Some hints in a few of the short term models that a smattering of showers could persist across the south overnight. Feel there is a better chance for more scattered/isolated development later in the day Monday - when instability can lend a hand. Will paint rain chances that way for now. High pressure builds in from the north on Monday, and will be the main weather influence into Wednesday. With mostly clear skies and a deep light wind layer, the setup is looking really good for widespread valley fog Tue morning. .LONG TERM...(Wednesday through Sunday) Issued at 220 PM CDT Sun Aug 6 2017 Looks somewhat active for the later half of the new week. Upper level shortwave slated to move eastward across northern parts of the region Wed, dropping a west-east running frontal boundary across the Upper Mississippi River valley as it does. Not very convergent, but with a rather weak flow, models suggest this boundary is going to hang around into the upcoming weekend. Various bits of upper level energy are progged to work on the boundary, with afternoon instability lending a hand. Expect periodic shower/storm chances as a result, with better chances in the afternoon/evening hours. Don't see much/if any of a severe threat at this time. Another shortwave in the 500 mb flow, stronger, slated to push southeast through the region for the weekend - per the GFS and EC. This will sweep the front out toward the end of the weekend, but also looks to provide a better shot for widespread showers/storms. Temps should continue to hold a few degrees below the seasonable normal, with dew points also relatively in check - keeping humidities lower and airmass fairly comfortable for early August. && .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) Issued at 1235 PM CDT Sun Aug 6 2017 Scattered showers are expected this afternoon into the evening. Will carry SHRA for KRST/KLSE early this afternoon with showers approaching the terminals and VCSH later this afternoon given uncertainty in coverage and timing of showers through the remainder of the day. There is a risk for an isolated thunderstorm this afternoon, but coverage is expected to remain too low for inclusion in the TAF. A brief period of MVFR ceilings/visibility is possible with heavier showers. Otherwise, VFR ceilings will persist into tonight with some clearing possible overnight. If skies do clear earlier tonight, some fog may develop with light winds persisting through the TAF period, but will not include for now. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && SHORT TERM...Rieck LONG TERM....Rieck AVIATION.....JM
Hazardous Weather Outlook National Weather Service La Crosse WI 333 AM CDT Sun Aug 6 2017 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-071200- 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- 333 AM CDT Sun Aug 6 2017 This Hazardous Weather Outlook is for portions of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...Today and Tonight Isolated thunderstorms are possible this afternoon into early this evening. Severe weather is not expected. .DAYS TWO THROUGH SEVEN...Monday through Saturday There will be periodic chances for thunderstorms from late Wednesday through the weekend. The threat for severe weather appears low at this time. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Wetenkamp
The La Crosse radar (KARX), 88 km away, was scanning. The volume nearest the first event began at 19:42 UTC.
1 funnel cloud. Local standard time, as filed.
A funnel cloud was filmed briefly near Monona, IA as non-severe thunderstorms moved along Highway 18 towards Wisconsin.
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, August 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: 719366.