Alert archive / California / Winter Weather Advisories in 2018
Winter Weather Advisory 4, NWS Eureka, CA
NWS Eureka, CA issued this winter weather advisory at Feb 17, 2018, 3:40 AM PST for Del Norte County, Humboldt County, Trinity County, California. It took effect at Feb 18, 2018, 4:00 AM PST. It was in force for 27 hr.
The area
The counties it named.
The facts
- Issued
- Feb 17, 2018, 3:40 AM PST (11:40 UTC)
- In effect from
- Feb 18, 2018, 4:00 AM PST
- Expired
- Feb 19, 2018, 7:00 AM PST
- In force
- 27 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 80 km from the middle of the area, began a volume at 11:43 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Salem/Mcnary, OR (KSLE), launched 00:00Z, 11.7 hours before the alert went out and 435 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 721 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 279 m²/s²
- 0-3 km storm-relative helicity
- 371 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter weather advisory went out, 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 this winter weather advisory went out at Feb 16, 2:54 PM PST, 12 hours 46 minutes earlier.
Area forecast discussion, Feb 16, 2:54 PM PST, 12 hours 46 minutes before
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</html>Hazardous weather outlook, Feb 16, 2:35 PM PST, 13 hours 5 minutes before
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</html>The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 17, 2:49 AM PST | Small Craft Advisory | EKA | 30 hr | |
| Feb 17, 3:00 PM PST | Gale Warning | EKA | 48 hr | |
| Feb 17, 3:00 PM PST | Small Craft Advisory | EKA | 17 hr | |
| Feb 17, 3:00 PM PST | Hazardous Seas Warning | EKA | 48 hr |
Nearby
Winter Weather Advisories in California, 2018Every winter weather advisory in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.