St. Helena, CA Live Doppler Radar

Live radar for St. Helena, Napa County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.

Open live radar for St. HelenaWhat TALON shows

What weather hits St. Helena?

Since 1996, the National Weather Service has logged river or areal flooding on 29 days in the North Bay Interior Valleys forecast zone and Napa County — the most common reported hazard around St. Helena, mostly in February and January. Next come excessive heat (19 days) and debris flows (18 days).

HazardDays reportedMost recentWorst on record
Flooding29Jan 2026Feb 4, 1996 · 1 death
Excessive heat19Mar 2026Jul 21, 2006 · 1 death
Debris flows18Jan 2021Apr 1, 2006 · 1 death · $34 million damage
Coastal flooding16Jan 2026—
High winds12Mar 2023Mar 19, 2011 · 1 death · $35,000 damage
Flash flooding11Feb 2017—
Wildfires6Jun 2024Jun 16, 2024 · $10 damage
Damaging thunderstorm winds2Feb 2024Feb 19, 2024 · $10 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 North Bay Interior Valleys forecast zone and Napa County; damage is as reported, not adjusted for inflation.

Which radars cover St. Helena?

The closest NEXRAD Doppler radar is KDAX (Sacramento, CA), about 43 miles east. 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.

RadarDistanceLowest beam over St. HelenaView
KDAX
Sacramento, CA		43 mi east2,900 ftExcellent — the lowest scan sees close to the ground
KBBX
Beale AFB, CA		81 mi north-northeast7,100 ftFair — the beam can pass over shallow snow and low-level rotation
KMUX
San Francisco, CA		99 mi south-southeast9,400 ftFair — the beam can pass over shallow snow and low-level rotation

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. Helena

Since 1950, NOAA has recorded 11 tornadoes within 25 miles of St. Helena, 1 of them EF2/F2 or stronger. Most came in December and February. The strongest was an F2 on June 1, 1958, which passed about 17 miles west-southwest of town. The most recent was an EF0 on April 27, 2016, which touched down about 19 miles east of town.

Hail: 2 reports of 1-inch or larger hail within 25 miles since 1955; the largest was 1.75-inch hail on August 19, 1983.

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. Helena'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. Helena radar FAQ

Where is the nearest weather radar to St. Helena, CA?

KDAX (Sacramento, CA), about 43 miles east. KBBX (Beale AFB, CA) is 81 miles away and also covers the area.

How often does St. Helena flood?

Since 1996 the National Weather Service has logged river or areal flooding on 29 days in the North Bay Interior Valleys forecast zone and Napa County; the deadliest was on February 4, 1996, with 1 death. 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 St. Helena 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. Helena, follow it right away — see watch vs. warning.

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