A couple rounds of thunderstorms moved across southwest Wisconsin during the early morning hours of September 15th. These storms dropped 2 to 3 inches of rain on already saturated soils and the resulting runoff produced some flooding across Grant County.
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The episode as NWS ARX wrote it up.
A couple rounds of thunderstorms moved across southwest Wisconsin during the early morning hours of September 15th. These storms dropped 2 to 3 inches of rain on already saturated soils and the resulting runoff produced some flooding across Grant County. Both the Grant and Platte Rivers went out of their banks prompting officials to close some roads in the vicinity of Beetown, Burton and Tennyson.
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 Sep 15, 1:50 AM CST, 2 hours 13 minutes earlier.
Area Forecast Discussion
National Weather Service La Crosse WI
250 AM CDT Sun Sep 15 2019
.SHORT TERM...(Today and tonight)
Issued at 248 AM CDT Sun Sep 15 2019
With the active weather overnight, today will be more of a cloud
clearing day with all the weather pushing east. Some creeks and
rivers will be rising across southwest Wisconsin and extreme
northeast Iowa /Clayton, Grant, Crawford counties/ where 1-3
inches of rain fell.
As the moisture transport in low-levels continues to veer to
westerly, convection will move east as well and by about
daybreak, the storms should be out of southwest WI. The Flash
Flood Watch will be allowed to expire at 7 am if all goes as
planned.
.LONG TERM...(Monday through Saturday)
Issued at 248 AM CDT Sun Sep 15 2019
Ridge building takes over the Great Lakes region through Tuesday
with above normal temperatures. Standardized anomalies of 1-2 for
low-level temperatures suggest warm but not record setting. Most
importantly, some drying is allowed to occur for the soils and
rivers.
Monday morning looks to be a river valley fog morning across the
area with high pressure, clear skies, light winds through about
5kft.
The longwave trough over the western U.S. begins to be problematic
Tuesday night as it continues to send shortwaves into the Northern
Plains. Southerly flow in the low-levels over much of the Upper
Miss Valley brings a 2-3 standardized anomaly for 850/925mb
moisture, in a N-S oriented moist tongue, through IA/MN by
Tuesday night. The large scale is not changing much and a slow
moving cold front co-located with this moist tongue shifts very
slowly across the area. While the signals are north of the area,
the GFS ensembles do suggest some higher precipitation anomalies
Wed/Thu. So, will have to keep an eye on this period for heavier
rainfall with the anomalous moisture in place. The weekend looks
active again as the western trough lifts bodily out and appears to
usher in a pattern change in the large scale.
&&
.AVIATION...(For the 06Z TAFS through 06Z Sunday night)
Issued at 949 PM CDT Sat Sep 14 2019
Main aviation concerns are on scattered showers and storms tonight
and MVFR to IFR stratus late tonight into Sunday morning.
Scattered showers and storms will move across the area tonight
with most of this activity staying south of the TAF sites. Then
guidance is suggesting low stratus develops across the area mainly
after 09Z. Ceilings are expected to fall to around 600 ft at KRST
by 11Z and to around 1500 ft at KLSE around 11Z. High pressure
then builds into the area late Sunday morning into Sunday
afternoon with a return to VFR conditions.
&&
.ARX WATCHES/WARNINGS/ADVISORIES...
WI...Flash Flood Watch until 7 AM CDT this morning for WIZ054-055-061.
MN...None.
IA...Flash Flood Watch until 7 AM CDT this morning for IAZ008>011-018-
019-029-030.
&&
SHORT TERM...Baumgardt
LONG TERM...Baumgardt
AVIATION...WetenkampHazardous Weather Outlook National Weather Service La Crosse WI 814 PM CDT Sat Sep 14 2019 MNZ079-088-WIZ017-029-032>034-041>044-151200- Wabasha-Winona-Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse- Monroe-Juneau-Adams- 814 PM CDT Sat Sep 14 2019 This Hazardous Weather Outlook is for portions of southeast Minnesota...central Wisconsin...north central Wisconsin and west central Wisconsin. .DAY ONE...Tonight Many area rivers will be running high or have some minor flooding over the next couple of days due to recent heavy rainfall. Scattered thunderstorms are expected tonight. A few storms could be strong with hail mainly near and south of Interstate 90. Also, the storms may produce heavy downpours on already saturated ground in some areas leading to local flooding concerns. .DAYS TWO THROUGH SEVEN...Sunday through Friday Thunderstorm chances return Tuesday night through Friday. It is too early to determine if any storms would be severe. .SPOTTER INFORMATION STATEMENT... Rainfall reports would be appreciated. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. IAZ008>011-018-019-029-030-MNZ086-087-094>096-WIZ053>055-061- 151200- Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette- Clayton-Dodge-Olmsted-Mower-Fillmore-Houston-Vernon-Crawford- Richland-Grant- 814 PM CDT Sat Sep 14 2019 This Hazardous Weather Outlook is for portions of north central Iowa...northeast Iowa...southeast Minnesota and southwest Wisconsin. .DAY ONE...Tonight A Flash Flood Watch is in effect tonight. Thunderstorms are expected tonight. Some storms may repeat over areas that already have saturated soils and rising rivers, increasing the threat for additional flooding or mudslides. A storm or two may also produce large hail. .DAYS TWO THROUGH SEVEN...Sunday through Friday Thunderstorm chances return Tuesday night through Friday. It is too early to determine if any storms would be severe. .SPOTTER INFORMATION STATEMENT... Reports of flooding and rainfall would be appreciated. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Wetenkamp
The national radar mosaic for the moment the first event began.
3 flood. Local standard time, as filed.
Runoff from heavy rain pushed the Platte River out of its banks near Rockville. The river crested almost a foot above the flood stage at 9.93 feet.
Runoff from heavy rain pushed both the Grant and Platte Rivers out of their banks. Flooding along these rivers sent water over some roads in the vicinity of Beetown, Burton and Tennyson, prompting officials to close the roads for a while.
Runoff from heavy rain pushed the Grant River out of its banks near Burton. The river crested a foot and a half above the flood stage at 19.5 feet.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2019Every state in 2019This day in weather historyWarnings in Wisconsin, September 2019
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: 855983, 855361, 855981.