Marissa, IL Live Doppler Radar
Live radar for Marissa, St. Clair County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.
What weather hits Marissa?
Since 1996, the National Weather Service has logged damaging thunderstorm winds on 181 days in the St. Clair forecast zone and St. Clair County — the most common reported hazard around Marissa, mostly in July and June. Next come excessive heat (71 days) and heavy snow & winter storms (45 days).
| Hazard | Days reported | Most recent | Worst on record |
|---|---|---|---|
| Damaging thunderstorm winds | 181 | Apr 2026 | Jul 13, 2016 · 1 death |
| Excessive heat | 71 | Aug 2025 | Jul 18, 1999 · 7 deaths |
| Heavy snow & winter storms | 45 | Nov 2025 | — |
| Flash flooding | 42 | Jul 2025 | Jul 26, 2022 · $10 million damage |
| Flooding | 13 | Jun 2019 | Jun 2, 2019 · $8.1 million damage |
| High winds | 8 | Mar 2025 | Sep 26, 1996 · $50,000 damage |
| Lightning casualties & damage | 7 | Apr 2019 | Apr 18, 2019 · 1 death |
| Ice storms & sleet | 5 | Feb 2022 | — |
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. Clair forecast zone and St. Clair County; damage is as reported, not adjusted for inflation.
How much snow does Marissa get?
A normal year brings about 12 inches of snow to Marissa, based on NOAA's 1991–2020 climate normals for the New Athens weather station 7.5 miles away. The snowiest month is usually January (4.0 in).
| Oct | Nov | Dec | Jan | Feb | Mar | Apr | May |
|---|---|---|---|---|---|---|---|
| 0.0 | 0.2 | 2.1 | 4.0 | 3.9 | 1.4 | 0.0 | 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 Marissa?
The closest NEXRAD Doppler radar is KLSX (St. Louis, MO), about 58 miles west-northwest. 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 Marissa | View |
|---|---|---|---|
| KLSX St. Louis, MO | 58 mi west-northwest | 4,400 ft | Good — most storms and steady rain or snow show clearly |
| KPAH Paducah, KY | 98 mi southeast | 9,400 ft | Fair — the beam can pass over shallow snow and low-level rotation |
| KVWX Evansville, IN | 111 mi east | 11,300 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 Marissa
Since 1950, NOAA has recorded 142 tornadoes within 25 miles of Marissa, 37 of them EF2/F2 or stronger. Most came in April and May. The strongest was an F4 on February 24, 1956, which passed about 23 miles north of town and caused 6 deaths. The most recent was an EF1 on May 19, 2025, which touched down about 22 miles southwest of town.
Hail: 341 reports of 1-inch or larger hail within 25 miles since 1955, 29 of them 2 inches or more; the largest was 4.50-inch hail on April 28, 2012.
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 Marissa'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.
Marissa radar FAQ
Where is the nearest weather radar to Marissa, IL?
KLSX (St. Louis, MO), about 58 miles west-northwest. KPAH (Paducah, KY) is 98 miles away and also covers the area.
Does radar show snow in Marissa?
Yes. TALON colors snow blue, a rain–snow mix pink and freezing rain purple using NOAA's precipitation-type analysis. Over Marissa the lowest scan from KLSX is about 4,400 ft up.
Is TALON's radar for Marissa 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 Marissa, follow it right away — see watch vs. warning.
Radar for nearby towns
- New Athens, IL radar 7 mi
- Sparta, IL radar 8 mi
- Red Bud, IL radar 13 mi
- Freeburg, IL radar 15 mi
- Smithton, IL radar 16 mi
- Okawville, IL radar 18 mi
- Steeleville, IL radar 18 mi
- Mascoutah, IL radar 19 mi
- New Baden, IL radar 20 mi
- Waterloo, IL radar 22 mi