Loudon, NH Live Doppler Radar
Live radar for Loudon, Merrimack County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.
What weather hits Loudon?
Since 1996, the National Weather Service has logged heavy snow or a winter storm on 152 days in the Merrimack forecast zone and Merrimack County — the most common reported hazard around Loudon, mostly in January and February. Next come damaging thunderstorm winds (94 days) and flooding (53 days).
| Hazard | Days reported | Most recent | Worst on record |
|---|---|---|---|
| Heavy snow & winter storms | 152 | Jan 2026 | — |
| Damaging thunderstorm winds | 94 | Jun 2026 | Jul 21, 2022 · $10,000 damage |
| Flooding | 53 | May 2025 | Feb 25, 2010 · $1.7 million damage |
| Flash flooding | 22 | Jun 2025 | Oct 20, 1996 · $2.2 million damage |
| Extreme cold & wind chill | 20 | Feb 2023 | — |
| Lightning casualties & damage | 19 | Jun 2025 | Jul 9, 1997 · $3.0 million damage |
| High winds | 18 | Oct 2017 | Oct 29, 2012 · $106,000 damage |
| Ice storms & sleet | 4 | Dec 2008 | Jan 7, 1998 · $3.7 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 Merrimack forecast zone and Merrimack County; damage is as reported, not adjusted for inflation.
How much snow does Loudon get?
A normal year brings about 68 inches of snow to Loudon, based on NOAA's 1991–2020 climate normals for the Concord Muni Ap weather station 6.2 miles away. The snowiest month is usually January (17.1 in).
| Oct | Nov | Dec | Jan | Feb | Mar | Apr | May |
|---|---|---|---|---|---|---|---|
| 0.8 | 2.5 | 14.3 | 17.1 | 16.9 | 13.6 | 2.5 | 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 Loudon?
The closest NEXRAD Doppler radar is KGYX (Portland, ME), about 74 miles northeast. 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 Loudon | View |
|---|---|---|---|
| KGYX Portland, ME | 74 mi northeast | 6,100 ft | Fair — the beam can pass over shallow snow and low-level rotation |
| KBOX Boston, MA | 93 mi south | 8,600 ft | Fair — the beam can pass over shallow snow and low-level rotation |
| KCXX Burlington, VT | 120 mi northwest | 12,700 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 Loudon
Since 1950, NOAA has recorded 23 tornadoes within 25 miles of Loudon, 7 of them EF2/F2 or stronger. Most came in July and June. The strongest was an EF2 on July 24, 2008, which passed about 10 miles east-southeast of town and caused 1 death. The most recent was an EF0 on August 22, 2020, which touched down about 22 miles north-northeast of town.
Hail: 133 reports of 1-inch or larger hail within 25 miles since 1955, 4 of them 2 inches or more; the largest was 2.50-inch hail on July 19, 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 Loudon'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.
Loudon radar FAQ
Where is the nearest weather radar to Loudon, NH?
KGYX (Portland, ME), about 74 miles northeast. KBOX (Boston, MA) is 93 miles away and also covers the area.
Does radar show snow in Loudon?
Yes. TALON colors snow blue, a rain–snow mix pink and freezing rain purple using NOAA's precipitation-type analysis. Over Loudon the lowest scan from KGYX is about 6,100 ft up, so light snow from shallow clouds can be under-shown — check NWS winter alerts too.
Is TALON's radar for Loudon 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 Loudon, follow it right away — see watch vs. warning.
Radar for nearby towns
- Concord, NH radar 6 mi
- Franklin, NH radar 16 mi
- Laconia, NH radar 20 mi
- Manchester, NH radar 21 mi
- Rochester, NH radar 25 mi
- Somersworth, NH radar 29 mi
- Dover, NH radar 30 mi
- Nashua, NH radar 37 mi
- Portsmouth, NH radar 38 mi
- Claremont, NH radar 44 mi