Alert archive / California / Winter Weather Advisories in 2020

Winter Weather Advisory 4, NWS Eureka, CA

January 15, 2020Humboldt County, Mendocino County, California

NWS Eureka, CA issued this winter weather advisory at Jan 15, 2020, 10:48 AM PST for Humboldt County, Mendocino County, California. It took effect at Jan 15, 2020, 4:00 PM PST. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: Jan 15, 2020, 10:48 AM PST (18:48 UTC)
In effect from: Jan 15, 2020, 4:00 PM PST
Expired: Jan 16, 2020, 4:00 PM PST
In force: 24 hr
Issued by: NWS Eureka, CA

Counties Humboldt County, CA, Mendocino County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 71 km from the middle of the area, began a volume at 18:50 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, 6.8 hours before the alert went out and 266 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: 764 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 300 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 Jan 15, 4:48 AM PST, 6 hours earlier.

Area forecast discussion, Jan 15, 4:48 AM PST, 6 hours before

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Hazardous weather outlook, Jan 15, 6:28 AM PST, 4 hours 20 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 15, 3:04 AM PST	Storm Warning	EKA		17 hr
Jan 15, 12:38 PM PST	Flood Watch	EKA	Del Norte, Humboldt	23 hr
Jan 15, 3:27 PM PST	High Wind Warning	EKA	Del Norte	3 hr

Nearby

Winter Weather Advisories in California, 2020 Every winter weather advisory in 2020

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.