Alert archive / California / Winter Weather Advisories in 2017
Winter Weather Advisory 11, NWS Eureka, CA
NWS Eureka, CA issued this winter weather advisory at Feb 23, 2017, 3:06 PM PST for 4 counties in California. It took effect at Feb 24, 2017, 1:00 PM PST. It was in force for 21 hr.
The area
The counties it named.
The facts
- Issued
- Feb 23, 2017, 3:06 PM PST (23:06 UTC)
- In effect from
- Feb 24, 2017, 1:00 PM PST
- Expired
- Feb 25, 2017, 10:00 AM PST
- In force
- 21 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 60 km from the middle of the area, began a volume at 23:08 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
Medford/Jackson, OR (KMFR), launched 12:00Z, 11.1 hours before the alert went out and 204 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
- 1 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 665 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 60 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 23, 3:18 AM PST, 11 hours 48 minutes earlier.
Area forecast discussion, Feb 23, 3:18 AM PST, 11 hours 48 minutes before
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</html>Hazardous weather outlook, Feb 23, 2:38 AM PST, 12 hours 28 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 23, 2:17 AM PST | Winter Storm Watch | EKA | Del Norte, Humboldt, Mendocino | 24 hr |
| Feb 23, 2:31 PM PST | Small Craft Advisory | EKA | 6 hr |
Nearby
Winter Weather Advisories in California, 2017Every winter weather advisory in 2017
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.