An upper-level trough dug southward across the Pacific Northwest during February 18th and 19th. Numerous hail showers developed along the coast, and snowfall occurred across the interior mountains.
Every event with a place to put it; 20 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS EKA wrote it up.
An upper-level trough dug southward across the Pacific Northwest during February 18th and 19th. Numerous hail showers developed along the coast, and snowfall occurred across the interior mountains.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Eureka, CA wrote its last area forecast discussion before the first event at Feb 17, 3:07 PM PST, 8 hours 53 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Eureka CA 215 PM PST Sat Feb 17 2018 CAZ102-105>108-182215- Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northern Trinity-Southern Trinity- 215 PM PST Sat Feb 17 2018 ...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM SUNDAY TO 4 AM PST MONDAY ABOVE 1,500 feet... This hazardous weather outlook is for northwest California. .DAY ONE...This afternoon and tonight. A Winter Weather Advisory is currently in effect starting Sunday morning. .DAYS TWO THROUGH SEVEN...Sunday through Friday. A Winter Weather Advisory is currently in effect through early Monday morning. Cold temperatures are expected Tuesday and Wednesday morning with lows in the teens and 20s in most areas. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. CAZ101-103-182215- Coastal Del Norte-Northern Humboldt Coast- 215 PM PST Sat Feb 17 2018 This hazardous weather outlook is for northwest California. .DAY ONE...This afternoon and tonight. No hazardous weather is expected. .DAYS TWO THROUGH SEVEN...Sunday through Friday. A cold storm system will bring rapidly falling snow levels from 3000 feet early Sunday morning to around 1000 feet early Monday morning. Rain and snow showers may impact travel on Sunday through Monday morning. Showers may contain small hail. Cold temperatures are expected Tuesday and Wednesday morning with lows in the 20s in most areas. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. CAZ104-182215- Southwestern Humboldt- 215 PM PST Sat Feb 17 2018 ...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM SUNDAY TO 4 AM PST MONDAY... This hazardous weather outlook is for northwest California. .DAY ONE...This afternoon and tonight. A Winter Weather Advisory is currently in effect. No hazardous weather is expected. .DAYS TWO THROUGH SEVEN...Sunday through Friday. A Winter Weather Advisory is currently in effect. Cold temperatures are expected Tuesday and Wednesday morning with lows in the teens and 20s in most areas. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. CAZ109>113-182215- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 215 PM PST Sat Feb 17 2018 This hazardous weather outlook is for northwest California. .DAY ONE...This afternoon and tonight. No hazardous weather is expected. .DAYS TWO THROUGH SEVEN...Sunday through Friday. A cold storm system will bring a chance for rain and high elevation snow showers for Sunday. Snow levels will fall from 3000 feet Sunday morning to around 1000 feet early Monday morning. Snow accumulations of up to 2 inches are possible. Cold temperatures are expected Tuesday and Wednesday morning with lows in the teens and 20s in most areas. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Eureka (Bunker Hill) radar (KBHX), 39 km away, was scanning. The volume nearest the first event began at 04:40 UTC.
20 winter weather, 2 hail, 2 heavy snow. Local standard time, as filed.
Observer measured 1.5 inches of snow. Some of the snow had already melted at the time of observation. 0.25 inch liquid equivalent. Location of the observation was 40.47N/-123.67W at an elevation of 2800 feet.
Station CA-HM-14 reported 2.5 inches of snow. Elevation is 597 feet.
CoCoRahs report of 3.0 inches of snow at an elevation of 524 feet.
CoCoRahs report of 0.5 inch of snow at an approximate elevation of 1061 feet.
Station CA-TY-6 measured 4 inches of snow accumulation.
Station CA-TY-28 reported 5.5 inches of snow. Elevation 2532 feet.
CoCoRahs report of 2.0 inches of snow at an elevation of 415 feet.
Spotter reported 1 inch of snow accumulation. Location was 39.13N/-123.21W.
Public report of 0.5 inch of snow. Elevation was 500 feet. Location was 40.77N/-124.14W.
Public report of 2 inches of snow that fell overnight. Elevation was 1200 feet. Location was 40.29N/-123.82W.
Public report of 1 inch of snow accumulation. Elevation approximately 400 feet. Location 40.55N/-124.1W.
Public report of 0.3 inch of snowfall accumulation.
Public report of 0.3 inch of snowfall accumulation. Elevation was 1780 feet.
Public report of 0.5 inch of snowfall accumulation. Elevation was approximately 2000 feet.
Report of 1.0 inch of snow at an elevation of 1256 feet.
Public report of 0.5 inch of snow at an elevation of 250 feet.
CoCoRaHS report of 0.1 inch of snow at an elevation of 150 feet.
Storm total snow accumulation of 5.0 inches. Elevation 1650 feet.
Hail covered road led to a 19 vehicle accident at the intersection of Highway 101 and Highway 255. 16 injuries were reported.
Public report of 3.6 inches of snow that occurred overnight. Elevation was 1395 feet. Location was 40.2N/-124.1W.
Spotter reported 8 inches of snow falling during the overnight period. Elevation was 2800 feet.
Hail/snow pellet covered road led to a 7 vehicle accident. Approximately a half inch of hail accumulated on the roadway. CHP reports that the multi-vehicle crash involved a motorcyclist who suffered minor injuries to her leg.
Public report of 4.0 inches of snow at an elevation of 1700 feet.
Spotter measured 8 inches of snow that occurred overnight, with snow drifts to 1 foot. Elevation of observation was 2800 feet. Location was 40.47N/-123.67W.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2018Every state in 2018This day in weather historyWarnings in California, February 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 732946, 732952, 732963, 732964, 732951, 732957, 732962, 732950, 732954, 732956, 732958, 732959, 732960, 732961, 732965, 732966, 732967, 732968, 732948, 732955, 741722, 732949, 732969, 732953.