Weather Alerts For Janesville, WI

# HEADLINE -------------------- Forecast flooding changed to Moderate severity and increased in duration for the following rivers in Wisconsin The Flood Warning continues for the following rivers in Wisconsin, Illinois FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE # SUMMARY -------------------- Rock River At Fort Atkinson affecting Jefferson County. Rock River At Jefferson affecting Jefferson County. Rock River At Watertown affecting Jefferson County. Crawfish River At Milford affecting Jefferson County. Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. Rock River At Afton affecting Rock and Winnebago Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. (Stages in ft.) Bank- Latest Forecast stages - Flood full observed ...for 7 pm... Location stage stage stage/time Fri Sat Sun Mon Afton 9.0 8.0 10.67 8 pm 4/23 10.7 10.7 10.6 10.6 - 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 12.11 1 am 4/18 -0.06 10.70 7 am 4/26 # DETAILS -------------------- 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 8:00 PM CDT Thursday the stage was 10.7 feet. - Bankfull stage is 8.0 feet. - RECENT ACTIVITY The maximum river stage in the 24 hours ending at 8:00 PM CDT Thursday was 10.7 feet. - FORECAST - The river is expected to hold steady in minor flood through the weekend. - Flood stage is 9.0 feet. - FLOOD HISTORY - This crest compares to a previous crest of 10.7 feet on 06/02/2000. - http://www.weather.gov/safety/flood ISSUED AT Thursday, April 23, 2026 at 9:33 PM CDT ISSUED BY National Weather Service Milwaukee/Sullivan WI HEADER Flood Statement # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Motorists should not attempt to drive around barricades or drive cars through flooded areas. Even 6 inches of fast-moving flood water can knock you off your feet and a depth of 2 feet will float your car. Never try to walk, swim, or drive through such swift water. If you come upon flood waters, stop, turn around and go another way. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov. The next statement will be issued Friday morning at 945 AM CDT.

Closest strike: 3.62 miles Stay Alert! Remain in a safe area until there has been no lightning within 10 miles of this location for 30 minutes. Please be aware that lightning activity can remain high even when a storm is moving away from your location. Even if rain has stopped, do not leave your safe area until WeatherBug indicates that lightning is more than 10 miles away from this selected location. IF OUTDOORS Avoid water, high ground, and open spaces. Avoid all metal objects including electric wires, fences, and machinery. Find a safe area in a building or in a fully enclosed vehicle with the windows completely shut. Unsafe places include underneath canopies, small picnic or rain shelters, convertibles, or near trees. IF INDOORS Avoid water and stay away from doors and windows. Avoid using a hard line telephone. Take off headphones. Turn off, unplug, and stay away from appliances, computers, power tools, and TV sets. Lightning may strike exterior electric and phone lines, inducing shocks to inside equipment.

There is a Marginal Severe Storm Risk for your location. Continue reading for today's outlook from the National Weather Service's Storm Prediction Center. -------------------- National Severe Storm Outlook THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS ARTS OF EASTERN KANSAS AND NORTHERN OKLAHOMA SUMMARY Scattered severe thunderstorms will continue this evening from parts of the southern and central Plains north-northeastward into the lower Missouri and upper Mississippi Valleys. Tornadoes, large hail and severe wind gusts are expected. Southern and Central Plains Latest water vapor imagery shows an upper-level trough over the Great Plains, with an associated mid-level jet streak moving through the base of the trough into the southern Plains. At the surface, a cold front is advancing southeastward across far southeast Nebraska, east-central Kansas and far northern Oklahoma. Ahead of the front, multiple line segments are ongoing. These broken lines are embedded with discrete to semi-discrete supercells. The storms are located along an axis of moderate to strong instability, with the RAP showing MLCAPE in the 2500 to 3500 J/kg range. Over the top of this moist and unstable airmass, flow is westerly around 50 knots. This is creating moderate to strong deep-layer shear which will continue to support supercells this evening. Steep mid-level lapse rates approaching 8 C/km will be favorable for large hail. In addition, the western edge of a 40 to 50 knot low-level jet will remain in place over eastern Kansas. WSR-88D VWPs that are sampling the low-level jet have 0-3 km storm-relative helicity in the 400 to 450 m2/s2 range, which will support a continued tornado threat. In addition, a threat for wind damage will also continue through the mid to late evening...see MCD 510. Lower Missouri Valley/Upper Mississippi Valley Southwesterly mid-level flow is in place over much of the north-central U.S. At the surface, a cold front is located from central Minnesota south-southwestward into the mid Missouri Valley. A line of strong to severe thunderstorms is ongoing ahead of the front from far southeastern Minnesota into central Iowa and far northwestern Missouri. Moderate instability is analyzed ahead of the line, with the RAP showing MLCAPE in the 1500 to 2000 J/kg range. The thermodynamic environment will continue to be favorable for isolated large hail. In addition, a 40 to 50 knot jet is analyzed over east-central Iowa. As the low-level jet strengthens, tornadoes will be possible with rotating cells embedded in the line. As the line continues to move eastward through the mid to late evening, wind damage will be possible with embedded supercells and bowing line segments.

Pollen Index: 11.7 Pollen Level: high Predominant Pollen: Maple, Birch and Alder. The amount of pollen in the air for Friday will be falling in the moderate range. This relief in pollen levels is caused in part by falling temperatures and heavy rains in the morning and evening which tend to wash pollen out of the air. With this amount of reduction in pollen levels, tomorrow should be better for allergy sufferers.