Mendon, IL Live Doppler Radar
Live radar for Mendon, Adams County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.
What weather hits Mendon?
Since 1996, the National Weather Service has logged damaging thunderstorm winds on 124 days in the Adams forecast zone and Adams County — the most common reported hazard around Mendon, mostly in June and July. Next come excessive heat (43 days) and heavy snow & winter storms (42 days).
| Hazard | Days reported | Most recent | Worst on record |
|---|---|---|---|
| Damaging thunderstorm winds | 124 | Apr 2026 | Sep 18, 2022 · $50,000 damage |
| Excessive heat | 43 | Aug 2023 | Jul 17, 2011 · 1 death |
| Heavy snow & winter storms | 42 | Nov 2025 | — |
| Flash flooding | 25 | May 2025 | Jun 18, 2008 · $500,000 damage |
| Flooding | 12 | Jun 2013 | Jun 4, 2008 · $124,000 damage |
| High winds | 8 | Nov 2019 | — |
| Ice storms & sleet | 8 | Jan 2022 | — |
| Extreme cold & wind chill | 6 | Jan 2025 | — |
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 Adams forecast zone and Adams County; damage is as reported, not adjusted for inflation.
Which radars cover Mendon?
The closest NEXRAD Doppler radar is KLSX (St. Louis, MO), about 101 miles south-southeast. 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 Mendon | View |
|---|---|---|---|
| KLSX St. Louis, MO | 101 mi south-southeast | 9,800 ft | Fair — the beam can pass over shallow snow and low-level rotation |
| KILX Lincoln, IL | 103 mi east | 10,100 ft | Limited — the beam overshoots the lowest part of storms |
| KDVN Quad Cities, IA | 112 mi north-northeast | 11,400 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 Mendon
Since 1950, NOAA has recorded 73 tornadoes within 25 miles of Mendon, 18 of them EF2/F2 or stronger. Most came in April and June. The strongest was an F3 on May 14, 1961, which passed about 16 miles southeast of town. The most recent was an EF0 on April 20, 2025, which passed about 19 miles south of town.
Hail: 286 reports of 1-inch or larger hail within 25 miles since 1955, 26 of them 2 inches or more; the largest was 4.50-inch hail on May 11, 2016.
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 Mendon'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.
Mendon radar FAQ
Where is the nearest weather radar to Mendon, IL?
KLSX (St. Louis, MO), about 101 miles south-southeast. KILX (Lincoln, IL) is 103 miles away and also covers the area.
Does radar show snow in Mendon?
Yes. TALON colors snow blue, a rain–snow mix pink and freezing rain purple using NOAA's precipitation-type analysis. Over Mendon the lowest scan from KLSX is about 9,800 ft up, so light snow from shallow clouds can be under-shown — check NWS winter alerts too.
Is TALON's radar for Mendon 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 Mendon, follow it right away — see watch vs. warning.
Radar for nearby towns
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- Hamilton, IL radar 21 mi
- Carthage, IL radar 24 mi
- Mount Sterling, IL radar 28 mi
- Barry, IL radar 30 mi
- Colchester, IL radar 35 mi
- Rushville, IL radar 38 mi
- La Harpe, IL radar 38 mi