Heavy Rain — Trinity, California

2025-01-03 · near Helena, Trinity, California

Event narrative

Rock slide reported in one lane of hwy 299, 2 miles east of Helena, CA.

Lat. 40.77N, Long. -123.09W.

Wider weather episode

A warm front will bring an initial push of precipitation and light snow at higher elevations. A cutoff low will follow, with a converging moisture flux which brought broader precipitation to areas of Del Norte and Humboldt in the following days. A colder air mass approaches in succession of the previously mentioned, bringing 500mb temperature of -27 to -29 Celsius, increasing instability over the weekend.

View location on OpenStreetMap → (40.7700, -123.0900)

Source: NOAA Storm Events Database, event_id 1235989. Narrative written by the NWS forecast office that issued the report.