Lannon, WI Live Doppler Radar
Live radar for Lannon, Waukesha County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.
What weather hits Lannon?
Since 1996, the National Weather Service has logged damaging thunderstorm winds on 149 days in the Waukesha forecast zone and Waukesha County — the most common reported hazard around Lannon, mostly in June and July. Next come heavy snow & winter storms (62 days) and lightning casualties & damage (45 days).
| Hazard | Days reported | Most recent | Worst on record |
|---|---|---|---|
| Damaging thunderstorm winds | 149 | Jun 2026 | May 31, 1998 · $6.8 million damage |
| Heavy snow & winter storms | 62 | Nov 2025 | Jan 12, 2024 · $80,000 damage |
| Lightning casualties & damage | 45 | Apr 2026 | Apr 15, 2026 · 1 death |
| Excessive heat | 42 | Jun 2026 | Jul 29, 1999 · 1 death |
| Extreme cold & wind chill | 34 | Jan 2026 | Feb 5, 2007 · $3,000 damage |
| Flash flooding | 32 | Apr 2026 | Aug 6, 1998 · 2 deaths · $17 million damage |
| Flooding | 25 | Apr 2026 | Jun 1, 2004 · $6.0 million damage |
| High winds | 15 | Mar 2026 | Nov 10, 1998 · $1.1 million damage |
Source: NOAA NCEI Storm Events Database, 1996–2026 (the latest year is partial). A "day" is a date with at least one report in the Waukesha forecast zone and Waukesha County; damage is as reported, not adjusted for inflation.
How much snow does Lannon get?
A normal year brings about 54 inches of snow to Lannon, based on NOAA's 1991–2020 climate normals for the Germantown weather station 5.9 miles away. The snowiest month is usually January (16.5 in).
| Oct | Nov | Dec | Jan | Feb | Mar | Apr | May |
|---|---|---|---|---|---|---|---|
| 0.3 | 2.4 | 10.3 | 16.5 | 16.0 | 6.5 | 2.0 | 0.3 |
Normal snowfall in inches. TALON Pro compares this season's snow at your location with these normals as winter goes on.
Which radars cover Lannon?
The closest NEXRAD Doppler radar is KMKX (Milwaukee/Sullivan, WI), about 24 miles west-southwest. Radar beams climb as they travel, so the height of the lowest scan over town decides how low in a storm the radar can see.
| Radar | Distance | Lowest beam over Lannon | View |
|---|---|---|---|
| KMKX Milwaukee/Sullivan, WI | 24 mi west-southwest | 1,400 ft | Excellent — the lowest scan sees close to the ground |
| KGRB Green Bay, WI | 93 mi north | 8,600 ft | Fair — the beam can pass over shallow snow and low-level rotation |
| KLOT Chicago, IL | 107 mi south | 10,700 ft | Limited — the beam overshoots the lowest part of storms |
Beam height is the center of the 0.5° scan above the radar, with standard refraction. Mountains near a radar can block it further.
Tornado & hail history near Lannon
Since 1950, NOAA has recorded 85 tornadoes within 25 miles of Lannon, 25 of them EF2/F2 or stronger. Most came in July and June. The strongest was an F4 on April 4, 1981, which touched down about 19 miles north of town and caused 3 deaths. The most recent was an EF0 on October 12, 2022, which touched down about 25 miles west-southwest of town.
Hail: 384 reports of 1-inch or larger hail within 25 miles since 1955, 38 of them 2 inches or more; the largest was 3.75-inch hail on August 2, 2015.
Source: NOAA Storm Prediction Center — tornadoes 1950–2025, hail 1955–2025. Distances are to each tornado's track; ratings before February 2007 use the original Fujita scale.
On TALON you get Lannon's live radar loop, rain/snow/ice colors, flash-flood risk, storm tracks with arrival times and NWS warnings free; close-up radar and rotation detection are part of TALON Pro.
Lannon radar FAQ
Where is the nearest weather radar to Lannon, WI?
KMKX (Milwaukee/Sullivan, WI), about 24 miles west-southwest. KGRB (Green Bay, WI) is 93 miles away and also covers the area.
Does radar show snow in Lannon?
Yes. TALON colors snow blue, a rain–snow mix pink and freezing rain purple using NOAA's precipitation-type analysis. Over Lannon the lowest scan from KMKX is about 1,400 ft up.
Is TALON's radar for Lannon free?
Yes — the US radar loop, rain/snow/ice colors, flash-flood risk, storm tracks and NWS warnings are free in any browser. Close-up radar, rotation detection and longer forecasts are part of TALON Pro.
Should I rely on radar for my safety?
No app replaces official warnings. When the National Weather Service issues a warning for Lannon, follow it right away — see watch vs. warning.
Radar for nearby towns
- Menomonee Falls, WI radar 2 mi
- Sussex, WI radar 4 mi
- Lisbon, WI radar 5 mi
- Butler, WI radar 5 mi
- Germantown, WI radar 6 mi
- Brookfield, WI radar 7 mi
- Richfield, WI radar 7 mi
- Pewaukee, WI radar 7 mi
- Pewaukee, WI radar 8 mi
- Merton, WI radar 8 mi