Norris Canyon, CA Live Doppler Radar
Live radar for Norris Canyon, Contra Costa County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.
What weather hits Norris Canyon?
Since 1996, the National Weather Service has logged river or areal flooding on 40 days in the East Bay Hills forecast zone and Contra Costa County — the most common reported hazard around Norris Canyon, mostly in January and February. Next come high winds (15 days) and debris flows (8 days).
| Hazard | Days reported | Most recent | Worst on record |
|---|---|---|---|
| Flooding | 40 | Jan 2026 | Jan 1, 2006 · $22 million damage |
| High winds | 15 | May 2026 | — |
| Debris flows | 8 | Feb 2019 | — |
| Flash flooding | 7 | Feb 2000 | Feb 13, 2000 · $100,000 damage |
| Damaging thunderstorm winds | 2 | Apr 2024 | Apr 5, 2024 · $10 damage |
| Wildfires | 1 | May 2025 | May 22, 2025 · $10 damage |
| Excessive heat | 1 | Mar 2026 | — |
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 East Bay Hills forecast zone and Contra Costa County; damage is as reported, not adjusted for inflation.
Which radars cover Norris Canyon?
The closest NEXRAD Doppler radar is KMUX (San Francisco, CA), about 41 miles south. 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 Norris Canyon | View |
|---|---|---|---|
| KMUX San Francisco, CA | 41 mi south | 2,700 ft | Excellent — the lowest scan sees close to the ground |
| KDAX Sacramento, CA | 55 mi north-northeast | 4,000 ft | Good — most storms and steady rain or snow show clearly |
| KBBX Beale AFB, CA | 122 mi north | 13,100 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 Norris Canyon
Since 1950, NOAA has recorded 12 tornadoes within 25 miles of Norris Canyon, 1 of them EF2/F2 or stronger. Most came in January and April. The strongest was an F2 on January 11, 1951, which passed about 23 miles south of town. The most recent was an EF1 on January 23, 2010, which touched down about 17 miles northeast of town.
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 Norris Canyon'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.
Norris Canyon radar FAQ
Where is the nearest weather radar to Norris Canyon, CA?
KMUX (San Francisco, CA), about 41 miles south. KDAX (Sacramento, CA) is 55 miles away and also covers the area.
How often does Norris Canyon flood?
Since 1996 the National Weather Service has logged river or areal flooding on 40 days in the East Bay Hills forecast zone and Contra Costa County. TALON's free flash-flood risk layer shows, every 2 minutes, how close the rain that has fallen is to what it takes to flood — turn it on under Layers.
Is TALON's radar for Norris Canyon 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 Norris Canyon, follow it right away — see watch vs. warning.
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