Knappa, OR Live Doppler Radar

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

Open live radar for Knappa What TALON shows

What weather hits Knappa?

Since 1996, the National Weather Service has logged river or areal flooding on 6 days in the North Oregon Coast Range Lowlands forecast zone and Clatsop County — the most common reported hazard around Knappa, mostly in January and December. Next come damaging thunderstorm winds (2 days) and heavy snow & winter storms (1 days).

Hazard	Days reported	Most recent	Worst on record
Flooding	6	Dec 2023	—
Damaging thunderstorm winds	2	Oct 2016	—
Heavy snow & winter storms	1	Feb 2025	—
Lightning casualties & damage	1	Dec 2004	—

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 Oregon Coast Range Lowlands forecast zone and Clatsop County; damage is as reported, not adjusted for inflation.

How much snow does Knappa get?

A normal year brings about 3.2 inches of snow to Knappa, based on NOAA's 1991–2020 climate normals for the Cathlamet 6Ne weather station 12.6 miles away. The snowiest month is usually December (1.9 in).

Oct	Nov	Dec	Jan	Feb	Mar	Apr	May
0.0	0.0	1.9	1.1	0.2	0.0	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 Knappa?

The closest NEXRAD Doppler radar is KRTX (Portland, OR), about 43 miles southeast. 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 Knappa	View
KRTX Portland, OR	43 mi southeast	2,900 ft	Excellent — the lowest scan sees close to the ground
KLGX Langley Hill, WA	70 mi north-northwest	5,700 ft	Good — most storms and steady rain or snow show clearly
KATX Seattle/Tacoma, WA	149 mi north-northeast	17,900 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 Knappa

Since 1950, NOAA has recorded 7 tornadoes within 25 miles of Knappa. Most came in October and June. The strongest was an F1 on October 3, 1967, which touched down about 17 miles west of town. The most recent was an EF0 on March 19, 2021, which touched down about 23 miles west-northwest of town.

Hail: 4 reports of 1-inch or larger hail within 25 miles since 1955, 1 of them 2 inches or more; the largest was 2.00-inch hail on January 18, 2018.

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 Knappa'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.

Knappa radar FAQ

Where is the nearest weather radar to Knappa, OR?

KRTX (Portland, OR), about 43 miles southeast. KLGX (Langley Hill, WA) is 70 miles away and also covers the area.

How often does Knappa flood?

Since 1996 the National Weather Service has logged river or areal flooding on 6 days in the North Oregon Coast Range Lowlands forecast zone and Clatsop 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 Knappa 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 Knappa, follow it right away — see watch vs. warning.

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