Alert archive / California / Winter Weather Advisories in 2017

Winter Weather Advisory 12, NWS Eureka, CA

February 25, 2017Del Norte County, Humboldt County, Trinity County, California

NWS Eureka, CA issued this winter weather advisory at Feb 25, 2017, 2:40 PM PST for Del Norte County, Humboldt County, Trinity County, California. It took effect at Feb 26, 2017, 8:00 AM PST. It was in force for 19 hr.

The area

The counties it named.

The facts

Issued: Feb 25, 2017, 2:40 PM PST (22:40 UTC)
In effect from: Feb 26, 2017, 8:00 AM PST
Expired: Feb 27, 2017, 2:46 AM PST
In force: 19 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 22:41 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, 10.7 hours before the alert went out and 165 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 25, 4:25 AM PST, 10 hours 15 minutes earlier.

Area forecast discussion, Feb 25, 4:25 AM PST, 10 hours 15 minutes before

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Hazardous weather outlook, Feb 25, 2:36 AM PST, 12 hours 4 minutes before

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In the hours before

Local storm report, Feb 25, 12:27 PM PST, 2 hours 13 minutes before

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The office that day

Everything else NWS Eureka, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 25, 1:34 AM PST	Beach Hazards Statement	EKA	Del Norte, Humboldt, Mendocino	35 hr
Feb 25, 1:48 AM PST	Winter Storm Watch	EKA	Del Norte, Humboldt	13 hr
Feb 25, 2:45 PM PST	Small Craft Advisory	EKA		60 hr

Nearby

Winter Weather Advisories in California, 2017 Every 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.