St. John, MO Live Doppler Radar
Live radar for St. John, St. Louis County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.
What weather hits St. John?
Since 1996, the National Weather Service has logged damaging thunderstorm winds on 207 days in the St. Louis forecast zone and St. Louis County — the most common reported hazard around St. John, mostly in June and July. Next come excessive heat (94 days) and flash flooding (66 days).
| Hazard | Days reported | Most recent | Worst on record |
|---|---|---|---|
| Damaging thunderstorm winds | 207 | Jun 2026 | May 16, 2025 · 1 death |
| Excessive heat | 94 | Aug 2025 | Jul 18, 1999 · 5 deaths |
| Flash flooding | 66 | Jun 2026 | Sep 14, 2008 · 3 deaths |
| Heavy snow & winter storms | 50 | Nov 2025 | Nov 30, 2006 · $40 million damage |
| Flooding | 20 | Apr 2025 | Dec 27, 2015 · $235 million damage |
| Lightning casualties & damage | 15 | Aug 2021 | Jun 15, 2010 · 1 death |
| High winds | 12 | Mar 2025 | Mar 14, 2025 · $50,000 damage |
| Ice storms & sleet | 6 | Feb 2022 | Jan 12, 2007 · $100,000 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 St. Louis forecast zone and St. Louis County; damage is as reported, not adjusted for inflation.
How much snow does St. John get?
A normal year brings about 17 inches of snow to St. John, based on NOAA's 1991–2020 climate normals for the St Louis Lambert Intl Ap weather station 3 miles away. The snowiest month is usually January (5.7 in).
| Oct | Nov | Dec | Jan | Feb | Mar | Apr | May |
|---|---|---|---|---|---|---|---|
| 0.0 | 0.9 | 3.2 | 5.7 | 4.3 | 2.3 | 0.2 | 0.0 |
Normal snowfall in inches. TALON Pro compares this season's snow at your location with these normals as winter goes on.
Which radars cover St. John?
The closest NEXRAD Doppler radar is KLSX (St. Louis, MO), about 18 miles west. 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 St. John | View |
|---|---|---|---|
| KLSX St. Louis, MO | 18 mi west | 1,000 ft | Excellent — the lowest scan sees close to the ground |
| KILX Lincoln, IL | 113 mi north-northeast | 11,600 ft | Limited — the beam overshoots the lowest part of storms |
| KPAH Paducah, KY | 143 mi southeast | 16,700 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 St. John
Since 1950, NOAA has recorded 163 tornadoes within 25 miles of St. John, 50 of them EF2/F2 or stronger. Most came in May and April. The strongest was an F4 on February 10, 1959, which passed about 7 miles south-southeast of town and caused 21 deaths. The most recent was an EF1 on June 4, 2025, which passed about 13 miles west-southwest of town.
Hail: 1,040 reports of 1-inch or larger hail within 25 miles since 1955, 126 of them 2 inches or more; the largest was 4.50-inch hail on May 25, 2011.
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 St. John'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.
St. John radar FAQ
Where is the nearest weather radar to St. John, MO?
KLSX (St. Louis, MO), about 18 miles west. KILX (Lincoln, IL) is 113 miles away and also covers the area.
Does radar show snow in St. John?
Yes. TALON colors snow blue, a rain–snow mix pink and freezing rain purple using NOAA's precipitation-type analysis. Over St. John the lowest scan from KLSX is about 1,000 ft up.
Is TALON's radar for St. John 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 St. John, follow it right away — see watch vs. warning.