Active Weather Alerts
River Flood Warning
Issued: 9:22 AM May. 1, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL WEDNESDAY EVENING... * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until Wednesday evening. * IMPACTS...At 10.0 feet, Floodwaters affect the property of a home on South Christian Road on the east side of the river in the Afton area. Minor erosional flood damage occurs to lowland and agricultural land adjacent to the river the Afton and Janesville areas. * ADDITIONAL DETAILS... - At 3:00 AM CDT Friday the stage was 10.1 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 AM CDT Friday was 10.3 feet. - Forecast...The river is expected to fall below flood stage early Wednesday afternoon and continue falling to 8.7 feet Thursday evening. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 10.1 feet on 06/24/1996. - 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 7 am... Location stage stage stage/time Sat Sun Mon Tue Afton 9.0 8.0 10.10 3 am 5/01 9.9 9.7 9.5 9.3 - 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 10.76 6 pm 4/25 -0.16 10.10 7 am 5/01 &&
River Flood Warning
Issued: 9:22 AM May. 1, 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 6.5 feet, Floodwaters are in the back yards of homes and businesses near east Mallwood Road Drive in Newville. * ADDITIONAL DETAILS... - At 4:00 AM CDT Friday the stage was 6.9 feet. - Bankfull stage is 5.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 4:00 AM CDT Friday was 7.1 feet. - Forecast...No forecast is available for this location. - Flood stage is 6.5 feet. - Flood History...This crest compares to a previous crest of 7.1 feet on 10/12/2019. - 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 6.89 4 am 5/01 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 7.61 1 pm 4/27 -0.13 Not Available &&
River Flood Warning
Issued: 9:22 AM May. 1, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL EARLY TUESDAY MORNING... * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until early Tuesday morning. * IMPACTS...At 11.0 feet, In the Town of Lake Koshkonong, floodwaters affect Vets Lane, Blackhawk Island Road, and Oxbow Bend Road. There is widespread flooding of roads and docks in the Town of Koshkonong and Town of Sumner including Vets Lane, Blackhawk Island Road and Oxbow Bend Road. * ADDITIONAL DETAILS... - At 4:00 AM CDT Friday the stage was 10.8 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 4:00 AM CDT Friday was 10.9 feet. - Forecast...The river is expected to fall below flood stage Monday evening and continue falling to 9.4 feet Thursday evening. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 10.6 feet on 04/07/2007. - 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 7 am... Location stage stage stage/time Sat Sun Mon Tue Lake Koshkonong 10.0 9.0 10.76 4 am 5/01 10.5 10.3 10.1 9.9 - 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 -0.13 10.80 1 am 5/01 &&
Freeze Warning
Issued: 6:42 AM May. 1, 2026 – National Weather Service
...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM CDT SATURDAY... * WHAT...For the Frost Advisory, temperatures as low as 32 will result in frost formation. For the Freeze Warning, sub-freezing temperatures as low as 29 expected. * WHERE...Fond du Lac, Dane, Green, Iowa, Lafayette, Rock, Dodge, and Jefferson Counties. * WHEN...For the Frost Advisory, until 8 AM CDT this morning. For the Freeze Warning, from midnight tonight to 8 AM CDT Saturday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. &&
Frost Advisory
Issued: 6:42 AM May. 1, 2026 – National Weather Service
...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM CDT SATURDAY... * WHAT...For the Frost Advisory, temperatures as low as 32 will result in frost formation. For the Freeze Warning, sub-freezing temperatures as low as 29 expected. * WHERE...Fond du Lac, Dane, Green, Iowa, Lafayette, Rock, Dodge, and Jefferson Counties. * WHEN...For the Frost Advisory, until 8 AM CDT this morning. For the Freeze Warning, from midnight tonight to 8 AM CDT Saturday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. &&
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