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Elev 866 ft, 42.68 °N, 89.02 °W

Janesville, WI Severe Weather Alertstar_ratehome

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Current Station
Personal Weather Station
Location: Janesville, WI
Elevation: 866ft
Nearby Weather Stations

Active Weather Alerts

River Flood Warning
Issued: 3:21 PM Apr. 27, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Rock River at Afton.

* WHEN...Until further notice.

* IMPACTS...At 10.5 feet, Floodwaters affect Riverside Park on the
north side of Janesville and South River Road on the south side of
Janesville. Floodwaters affect low spots on South River Rd on the
south side of Janesville. Floodwaters affect a home on South
Christian Rd on the east side of the river in the Afton area.
There is extensive lowland and agricultural land flooding in the
Afton and Janesville areas.

* ADDITIONAL DETAILS...
- At 10:00 AM CDT Monday the stage was 10.6 feet.
- Bankfull stage is 8.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 10:00 AM CDT Monday was 10.7 feet.
- Forecast...The river is expected to rise to a crest of 10.6
feet this afternoon.
- Flood stage is 9.0 feet.
- http://www.weather.gov/safety/flood

&&

River forecasts are available for some but not all river gaging
locations. The 7 day river forecast takes into account past
precipitation, soil moisture conditions, and predicted
precipitation for the basin. Precipitation is for the next 24 hours
in the future from April through September and for 48 hours in the
future from October through March.

(Stages in ft.)       Bank-       Latest         Forecast stages
-               Flood full       observed        ...for 1 pm...
Location        stage stage     stage/time    Tue  Wed  Thu  Fri
Afton           9.0   8.0   10.57 10 am 4/27  10.6 10.5 10.4 10.3

-                    Highest       24 hour change
-                    observed      in river stage
-                    stage in        (ft.) up to     Highest stage
-                    the last      latest observed    forecast in
-                     7 days            stage         next 7 days
Afton           10.77 3 pm 4/22        -0.11       10.60 7 am 4/29


&&



River Flood Warning
Issued: 3:21 PM Apr. 27, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

* WHAT...Minor flooding is occurring.

* WHERE...Rock River at Newville.

* WHEN...Until further notice.

* IMPACTS...At 7.5 feet, Floodwaters surround some homes near East
Mallwood Drive and are into yards and roads across eastern
Newville. Floodwaters affect a riverside restaurant and its
parking lot on the south side of the river.

* ADDITIONAL DETAILS...
- At 10:00 AM CDT Monday the stage was 7.3 feet.
- Bankfull stage is 5.5 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 10:00 AM CDT Monday was 7.4 feet.
- Forecast...No forecast is available for this location.
- Flood stage is 6.5 feet.
- http://www.weather.gov/safety/flood

&&

River forecasts are available for some but not all river gaging
locations. The 7 day river forecast takes into account past
precipitation, soil moisture conditions, and predicted
precipitation for the basin. Precipitation is for the next 24 hours
in the future from April through September and for 48 hours in the
future from October through March.

(Stages in ft.)       Bank-       Latest         Forecast stages
-               Flood full       observed        ...for 5 pm...
Location        stage stage     stage/time    Thu  Fri  Sat  Sun
Newville        6.5   5.5   7.30  10 am 4/27  not a forecast point

-                    Highest       24 hour change
-                    observed      in river stage
-                    stage in        (ft.) up to     Highest stage
-                    the last      latest observed    forecast in
-                     7 days            stage         next 7 days
Newville        7.57  10 pm 4/24       -0.10         Not Available


&&



River Flood Warning
Issued: 3:21 PM Apr. 27, 2026 – National Weather Service
...FLOOD WARNING NOW IN EFFECT UNTIL MONDAY, MAY 04...

* WHAT...Moderate flooding is occurring and moderate flooding is
forecast.

* WHERE...Rock River near Lake Koshkonong.

* WHEN...Until Monday, May 04.

* IMPACTS...At 11.3 feet, There is knee-deep water over Blackhawk
Island Road. Lamp Road on west side of river also becomes flooded.
Lake Koshkonong merges with Mud Lake to the east of Lake
Koshkonong.

* ADDITIONAL DETAILS...
- At 10:00 AM CDT Monday the stage was 11.2 feet.
- Bankfull stage is 9.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 10:00 AM CDT Monday was 11.3 feet.
- Forecast...The river is expected to rise to a crest of 11.2
feet this afternoon. It will then fall below flood stage
Sunday evening.
- Flood stage is 10.0 feet.
- http://www.weather.gov/safety/flood

&&

River forecasts are available for some but not all river gaging
locations. The 7 day river forecast takes into account past
precipitation, soil moisture conditions, and predicted
precipitation for the basin. Precipitation is for the next 24 hours
in the future from April through September and for 48 hours in the
future from October through March.

(Stages in ft.)       Bank-       Latest         Forecast stages
-               Flood full       observed        ...for 1 pm...
Location        stage stage     stage/time    Tue  Wed  Thu  Fri
Lake Koshkonong 10.0  9.0   11.19 10 am 4/27  11.0 10.9 10.7 10.5

-                    Highest       24 hour change
-                    observed      in river stage
-                    stage in        (ft.) up to     Highest stage
-                    the last      latest observed    forecast in
-                     7 days            stage         next 7 days
Lake Koshkonong 11.42 3 pm 4/24        -0.11       11.20 7 pm 4/27


&&



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