Hail Swath Map Preview
The Janesville, WI hail swath map preview was last reviewed on August 27, 2026 and shows mapped hail estimates up to 0.75". There are 0 public hail reports, 19 public wind reports, and 0 nearby tornado reports listed for the August 11, 2021 event.
View the August 11, 2021 Janesville, WI hail event on the free interactive hail map, then check a free Hail Report by ZIP to see a more local hail signal for your area.
Impact Area and Population for the Janesville, WI Hail Map
The August 11, 2021 hail swath map for Janesville, WI covers approximately 403 square miles and includes an estimated 130,902 people inside the mapped footprint. The largest mapped area is in the < 0.50" hail band, covering 214 square miles. The highest estimated population exposure is in the < 0.50" hail band with 71,498 people.
| Mapped Hail Band | Impact Area | Population |
|---|---|---|
| < 0.50" | 214 sq mi | 71,498 |
| 0.50-0.75" | 165 sq mi | 51,677 |
| 0.75-1.00" | 24 sq mi | 7,727 |
Get a free Hail Report by ZIP to see a more local hail signal and whether the August 11, 2021 Janesville, WI hail event may have reached your area.
Housing Exposure Inside the Janesville, WI Hail Swath Map
Inside the August 11, 2021 hail swath map area for Janesville, WI, HailGeeks estimates 53,114 single-family homes, 4,306 townhomes, and 21,161 multifamily properties within the mapped storm footprint. Single-family-home exposure is highest in the < 0.50" hail band, with 30,272 single-family homes.
| Mapped Hail Band | Single-Family | Townhomes | Multifamily |
|---|---|---|---|
| < 0.50" | 30,272 | 2,291 | 10,480 |
| 0.50-0.75" | 20,311 | 1,730 | 9,140 |
| 0.75-1.00" | 2,531 | 285 | 1,541 |
Use this table to review housing exposure by hail band for the August 11, 2021 Janesville, WI hail map. To check a specific property more closely, use a free Hail Report by Address.
Counties Inside the Janesville, WI Hail Map
Hail from the August 11, 2021 storm was mapped across 18 counties in the Janesville, WI region. Winnebago County, IL had the strongest mapped signal, peaking at 0.75" with roughly 9,986 single-family homes inside the swath.
County pages group every mapped hail event in the area. For a closer look, drop to the city or ZIP level below, or run a free Hail Report by Address.
Cities Inside the Janesville, WI Hail Map
Zooming in, the swath touched 22 cities near Janesville, WI. Rockford, IL had the strongest mapped signal at 0.50", with an estimated 9,887 single-family homes exposed.
City cards show where the August 11, 2021 Janesville, WI hail activity was mapped, but your ZIP can show a closer local signal. Get a free Hail Report by ZIP, and if the signal looks meaningful, ask a local pro about a Remote Hail Inspection to see whether an on-site roof or exterior review may be worth scheduling.
ZIP Codes Inside the Janesville, WI Hail Swath Map
At the ZIP level, the August 11, 2021 Janesville, WI hail map spans 41 ZIP codes. ZIP 53105 shows the strongest local signal, with mapped hail estimates up to 0.75" and an estimated single-family-home exposure of 4,530.
Check your ZIP in seconds to see whether hail activity from the August 11, 2021 Janesville, WI event was mapped near your area.
Public Hail, Wind, and Tornado Reports
Public storm report tables connected to the August 11, 2021 hail map for Janesville, WI currently list 0 public hail reports, 19 public wind reports, and 0 tornado reports.
| Date & Time | Hail Size | City | State | Description |
|---|---|---|---|---|
| No public hail reports are available for this event. | ||||
| Date & Time | Wind Speed | City | State | Description |
|---|---|---|---|---|
August 11, 2021 9:40 AM CT | Rockford | IL | MULTIPLE REPORTS OF TREE DAMAGE IN ROCKFORD. | |
August 11, 2021 9:51 AM CT | Belvidere | IL | TREES AND WIRES DOWNED IN VARIOUS LOCATIONS IN AND AROUND BELVIDERE. | |
August 11, 2021 9:54 AM CT | South Elgin | IL | LARGE TREE BRANCH DOWNED. | |
August 11, 2021 9:55 AM CT | 1 N Timberlane | IL | TREE DOWNED ONTO WIRES. | |
August 11, 2021 9:59 AM CT | Elgin | IL | LARGE TREE BRANCH DOWNED. | |
August 11, 2021 10:00 AM CT | Sleepy Hollow | IL | LARGE TREE UPROOTED. | |
August 11, 2021 10:01 AM CT | Woodstock | IL | LARGE TREE SNAPPED HALFWAY UP. | |
August 11, 2021 10:03 AM CT | 2 E Schaumburg | IL | 9 INCH DIAMETER BRANCH DOWNED. | |
August 11, 2021 10:04 AM CT | 2 E Lakewood | IL | LARGE TREE SNAPPED. | |
August 11, 2021 10:05 AM CT | Prairie Grove | IL | PARTS OF LARGE TREES SNAPPED OFF. | |
August 11, 2021 10:08 AM CT | 2 SSW Rockford | IL | *** 1 FATAL *** THREE PEOPLE WERE RESCUED FROM A MOBILE HOME THAT WAS CRUSHED BY A FALLEN TREE. ONE FATALITY WAS REPORTED. TIME CONFIRMED BY 911 CALL CENTER. | |
August 11, 2021 10:09 AM CT | Wonder Lake | IL | SEVERAL TREES DOWNED IN WONDER LAKE. | |
August 11, 2021 10:13 AM CT | Wauconda | IL | POWER LINES DOWNED ONTO ROADS. | |
August 11, 2021 10:16 AM CT | 1 NW Long Lake | IL | LARGE TREE DOWNED ONTO FENCE. | |
August 11, 2021 10:17 AM CT | Grayslake | IL | LARGE TREE UPROOTED. | |
August 11, 2021 10:18 AM CT | Fox Lake | IL | SEVERAL TREES SNAPPED OR DOWNED IN FOX LAKE. | |
August 11, 2021 10:26 AM CT | 1 SW Antioch | IL | SIDING RIPPED OFF OF HOUSE AND FENCE KNOCKED DOWN. | |
August 11, 2021 6:45 PM CT | 2 NE Eagle Lake | WI | MULTIPLE TREES AND A POWER LINE DOWN. | |
August 11, 2021 9:31 AM CT | 60 mph | Rockford Airport | IL | KRFD ASOS PEAK GUST. |
| Date & Time | Rating | City | State | Description |
|---|---|---|---|---|
| No public tornado reports are available for this event. | ||||
This table includes only public storm reports connected to the August 11, 2021 Janesville, WI storm event. When available, each report may include the time, size or magnitude, city, state, and a short description.
Related Hail Maps in the Janesville, WI Region
We found 6 more hail maps with reports from the same Janesville, WI region as the August 11, 2021 event. These related maps cover storm dates from Jul 28, 2021 through Aug 10, 2021, with mapped hail estimates ranging from 0.75" to 1.25". In this set, the strongest related map reached 1.25", and the most recent map shown is from Aug 10, 2021.
If none of these related Janesville, WI hail maps look close enough to your property, check a free Hail Report by Address. It reviews hail history for a specific location — not just the broader Janesville, WI region — so you can check whether hail activity may have reached your property.
Local Hail Review Options Near Janesville, WI
Not sure whether the August 11, 2021 Janesville, WI hail map matters for your property? Start with a free Hail Report by Address to see whether hail activity was mapped for that property. If the property signal looks meaningful, you can choose a local pro serving the Janesville, WI region and ask about a Remote Hail Inspection before deciding whether an on-site roof or exterior review is worth scheduling.
Check a specific property to see whether hail activity from the August 11, 2021 Janesville, WI event — or another recent hail event — may have been mapped at that address.
Find a roof or exterior pro serving the Janesville, WI region who can help you understand what the property hail signal may mean.
A participating local pro reviews property-level hail history remotely — not just the August 11, 2021 event — to help decide whether an on-site inspection may be worth scheduling.
A free Hail Report by Address and a Remote Hail Inspection can help you look beyond the August 11, 2021 hail map visuals alone. They do not confirm property damage and do not replace an on-site inspection for a property in the Janesville, WI region, but they can help you make a more informed next decision before anyone climbs on the roof.
Frequently Asked Questions
Common questions about the August 11, 2021 Janesville, WI hail event.