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 2.50". There are 32 public hail reports, 7 public wind reports, and 0 nearby tornado reports listed for the September 7, 2021 event.
View the September 7, 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 September 7, 2021 hail swath map for Janesville, WI covers approximately 4,017 square miles and includes an estimated 1,059,476 people inside the mapped footprint. The largest mapped area is in the 0.50-0.75" hail band, covering 1,598 square miles. The highest estimated population exposure is in the 0.50-0.75" hail band with 454,773 people.
| Mapped Hail Band | Impact Area | Population |
|---|---|---|
| < 0.50" | 1,058 sq mi | 225,008 |
| 0.50-0.75" | 1,598 sq mi | 454,773 |
| 0.75-1.00" | 770 sq mi | 231,194 |
| 1.00-1.25" | 346 sq mi | 80,407 |
| 1.25-1.50" | 153 sq mi | 46,075 |
| 1.50-1.75" | 50 sq mi | 16,366 |
| 1.75-2.00" | 24 sq mi | 3,678 |
| 2.00-2.25" | 13 sq mi | 1,620 |
| 2.25-2.50" | 3 sq mi | 241 |
| 2.50-2.75" | 2 sq mi | 114 |
Get a free Hail Report by ZIP to see a more local hail signal and whether the September 7, 2021 Janesville, WI hail event may have reached your area.
Housing Exposure Inside the Janesville, WI Hail Swath Map
Inside the September 7, 2021 hail swath map area for Janesville, WI, HailGeeks estimates 393,047 single-family homes, 39,461 townhomes, and 164,456 multifamily properties within the mapped storm footprint. Single-family-home exposure is highest in the 0.50-0.75" hail band, with 157,599 single-family homes.
| Mapped Hail Band | Single-Family | Townhomes | Multifamily |
|---|---|---|---|
| < 0.50" | 85,003 | 7,404 | 34,650 |
| 0.50-0.75" | 157,599 | 15,493 | 82,626 |
| 0.75-1.00" | 87,981 | 10,066 | 34,445 |
| 1.00-1.25" | 33,296 | 3,378 | 6,938 |
| 1.25-1.50" | 19,157 | 2,271 | 4,450 |
| 1.50-1.75" | 7,240 | 664 | 1,082 |
| 1.75-2.00" | 1,886 | 139 | 210 |
| 2.00-2.25" | 745 | 29 | 46 |
| 2.25-2.50" | 96 | 11 | 6 |
| 2.50-2.75" | 44 | 6 | 3 |
Use this table to review housing exposure by hail band for the September 7, 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 September 7, 2021 storm was mapped across 28 counties in the Janesville, WI region. McHenry County, IL had the strongest mapped signal, peaking at 2.50" with roughly 62,259 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 166 cities near Janesville, WI. Harvard, IL had the strongest mapped signal at 2.00", with an estimated 1,305 single-family homes exposed.
City cards show where the September 7, 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 September 7, 2021 Janesville, WI hail map spans 167 ZIP codes. ZIP 60033 shows the strongest local signal, with mapped hail estimates up to 2.50" and an estimated single-family-home exposure of 3,943.
Check your ZIP in seconds to see whether hail activity from the September 7, 2021 Janesville, WI event was mapped near your area.
Public Hail, Wind, and Tornado Reports
Public storm report tables connected to the September 7, 2021 hail map for Janesville, WI currently list 32 public hail reports, 7 public wind reports, and 0 tornado reports.
| Date & Time | Hail Size | City | State | Description |
|---|---|---|---|---|
September 7, 2021 10:30 AM CT |
1.00 in | Mazomanie | WI | REPORT OF QUARTER SIZE HAIL FROM MAZOMANIE. TIME ESTIMATED FROM RADAR. |
September 7, 2021 10:38 AM CT |
1.50 in | Doylestown | WI | TIME ESTIMATED FROM RADAR. |
September 7, 2021 10:51 AM CT |
1.00 in | 4 NNE Cross Plains | WI | No National Weather Service description provided. |
September 7, 2021 10:55 AM CT |
1.00 in | 1 ESE Middleton | WI | No National Weather Service description provided. |
September 7, 2021 10:57 AM CT |
1.00 in | 1 NNE Verona | WI | No National Weather Service description provided. |
September 7, 2021 10:58 AM CT |
1.50 in | 2 W Verona | WI | No National Weather Service description provided. |
September 7, 2021 10:59 AM CT |
1.00 in | 2 W Verona | WI | No National Weather Service description provided. |
September 7, 2021 11:07 AM CT |
1.00 in | Juneau | WI | NICKEL TO QUARTER SIZE HAIL. |
September 7, 2021 11:08 AM CT |
1.00 in | Mcfarland | WI | TIME ESTIMATED FROM RADAR. |
September 7, 2021 11:10 AM CT |
1.00 in | Fitchburg | WI | No National Weather Service description provided. |
September 7, 2021 11:22 AM CT |
1.00 in | Allenton | WI | SHERIFFS OFFICE REPORTED QUARTER SIZE HAIL IN ALLENTON. |
September 7, 2021 11:22 AM CT |
1.00 in | Stoughton | WI | SPOTTER REPORTED QUARTER SIZE HAIL IN STOUGHTON. |
September 7, 2021 11:24 AM CT |
1.00 in | 2 WSW Watertown | WI | No National Weather Service description provided. |
September 7, 2021 11:35 AM CT |
1.00 in | Edgerton | WI | No National Weather Service description provided. |
September 7, 2021 11:52 AM CT |
1.00 in | Milton | WI | REPORT FROM MPING: QUARTER (1.00 IN.). |
September 7, 2021 12:32 PM CT |
1.25 in | Delavan | WI | CORRECTS PREVIOUS HAIL REPORT FROM DELAVAN. 1.0 TO 1.25 INCH HAIL REPORTED BY TRAINED SPOTTER. |
September 7, 2021 12:33 PM CT |
1.50 in | 1 N Delavan | WI | MULTIPLE REPORTS OF 1.0 TO 1.5 INCH HAIL REPORTED AROUND DELAVAN WI. |
September 7, 2021 12:35 PM CT |
1.00 in | 4 WSW Clinton | WI | No National Weather Service description provided. |
September 7, 2021 12:42 PM CT |
1.00 in | Elkhorn | WI | No National Weather Service description provided. |
September 7, 2021 12:44 PM CT |
1.50 in | Williams Bay | WI | PENNY SIZE TO PING PONG BALL SIZE. TIME ESTIMATED FROM RADAR. |
September 7, 2021 12:44 PM CT |
1.00 in | 1 NNE Como | WI | No National Weather Service description provided. |
September 7, 2021 12:44 PM CT |
1.75 in | 2 N Ustick | IL | DELAYED REPORT. HAIL RANGED FROM PEA TO 1 INCH WITH SOME GOLFBALL SIZED. OCCURRED 1244-47 PM. |
September 7, 2021 12:46 PM CT |
1.00 in | 1 S Como | WI | No National Weather Service description provided. |
September 7, 2021 12:48 PM CT |
1.00 in | 1 NNW Walworth | WI | No National Weather Service description provided. |
September 7, 2021 12:55 PM CT |
1.75 in | 1 NNW Timberlane | IL | TIME ESTIMATED FROM RADAR. |
September 7, 2021 12:59 PM CT |
1.50 in | Harvard | IL | TIME ESTIMATED BY RADAR. |
September 7, 2021 1:16 PM CT |
1.00 in | 2 E Richmond | IL | No National Weather Service description provided. |
September 7, 2021 1:20 PM CT |
1.00 in | Spring Grove | IL | No National Weather Service description provided. |
September 7, 2021 1:23 PM CT |
1.00 in | 1 NW Johnsburg | IL | QUARTER SIZE HAIL REPORT FROM MPING. TIME ESTIMATED FROM RADAR. |
September 7, 2021 1:27 PM CT |
1.50 in | Woodstock | IL | No National Weather Service description provided. |
September 7, 2021 1:29 PM CT |
1.00 in | Round Lake | IL | TIME ESTIMATED BY RADAR. LOCATION APPROXIMATED BY WFO BGM... CALLER ONLY GAVE ZIP CODE. |
September 7, 2021 1:30 PM CT |
1.00 in | Round Lake | IL | TIME ESTIMATED FROM RADAR. |
| Date & Time | Wind Speed | City | State | Description |
|---|---|---|---|---|
September 7, 2021 12:32 PM CT | 2 NW Shirland | IL | PICTURE OF TREE DOWN SENT VIA SOCIAL MEDIA. TIME IS ESTIMATED FROM RADAR. | |
September 7, 2021 1:13 PM CT | Wonder Lake | IL | SMALL TREE ABOUT 6 INCHES IN DIAMETER SNAPPED. TIME ESTIMATED FROM RADAR. | |
September 7, 2021 1:30 PM CT | 2 SSW Prairie Grove | IL | NUMEROUS TREE BRANCHES DOWNED AND SNAPPED... LARGE BRANCH BLOCKING WESTBOUND LANE OF IL-176. TIME ESTIMATED FROM RADAR. | |
September 7, 2021 1:36 PM CT | 1 SSW Island Lake | IL | MULTIPLE LARGE BRANCHES AND TREES DOWN ALONG ROBERTS RD. TIME ESTIMATED FROM RADAR. | |
September 7, 2021 1:45 PM CT | Vernon Hills | IL | 14 INCH DIAMETER TREE SNAPPED AT BASE. TIME ESTIMATED BY RADAR. | |
September 7, 2021 1:54 PM CT | 1 SE Island Lake | IL | PICTURE OF LARGE TREE DOWN AND BLOCKING DARREL RD SOUTH OF IL-176 RELAYED VIA SOCIAL MEDIA. | |
September 7, 2021 1:29 PM CT | 68 mph | 2 SE Bull Valley | IL | MEASURED ON PERSONAL WEATHER STATION. |
| 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 September 7, 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 September 7, 2021 event. These related maps cover storm dates from Aug 11, 2021 through Aug 29, 2021, with mapped hail estimates ranging from 0.75" to 1.00". In this set, the strongest related map reached 1.00", and the most recent map shown is from Aug 29, 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 September 7, 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 September 7, 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 September 7, 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 September 7, 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 September 7, 2021 Janesville, WI hail event.