Port Costa, CA Live Doppler Radar

Live radar for Port Costa, Contra Costa County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.

Open live radar for Port CostaWhat TALON shows

What weather hits Port Costa?

Since 1996, the National Weather Service has logged river or areal flooding on 40 days in the East Bay Interior Valleys forecast zone and Contra Costa County — the most common reported hazard around Port Costa, mostly in January and February. Next come excessive heat (19 days) and high winds (11 days).

HazardDays reportedMost recentWorst on record
Flooding40Jan 2026Jan 1, 2006 · $22 million damage
Excessive heat19Mar 2026Jun 27, 2009 · 1 death
High winds11Jan 2019Jan 7, 2017 · 1 death
Debris flows11Feb 2019Apr 6, 2006 · $11 million damage
Wildfires8May 2022Aug 7, 2019 · $5,000 damage
Flash flooding7Feb 2000Feb 13, 2000 · $100,000 damage
Damaging thunderstorm winds2Apr 2024Apr 5, 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 East Bay Interior Valleys forecast zone and Contra Costa County; damage is as reported, not adjusted for inflation.

Which radars cover Port Costa?

The closest NEXRAD Doppler radar is KDAX (Sacramento, CA), about 42 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.

RadarDistanceLowest beam over Port CostaView
KDAX
Sacramento, CA		42 mi northeast2,800 ftExcellent — the lowest scan sees close to the ground
KMUX
San Francisco, CA		63 mi south-southeast4,900 ftGood — most storms and steady rain or snow show clearly
KBBX
Beale AFB, CA		105 mi north-northeast10,300 ftLimited — 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 Port Costa

Since 1950, NOAA has recorded 8 tornadoes within 25 miles of Port Costa. Most came in December and September. The strongest was an EF1 on January 23, 2010, which touched down about 25 miles east-southeast of town. The most recent was an EF0 on April 7, 2011, which touched down about 14 miles north-northeast of town.

Hail: 3 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 Port Costa'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.

Port Costa radar FAQ

Where is the nearest weather radar to Port Costa, CA?

KDAX (Sacramento, CA), about 42 miles northeast. KMUX (San Francisco, CA) is 63 miles away and also covers the area.

How often does Port Costa flood?

Since 1996 the National Weather Service has logged river or areal flooding on 40 days in the East Bay Interior Valleys 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 Port Costa 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 Port Costa, follow it right away — see watch vs. warning.

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