Alert archive / California / Winter Weather Advisories in 2017

Winter Weather Advisory 6, NWS Eureka, CA

January 21, 20174 counties in California

NWS Eureka, CA issued this winter weather advisory at Jan 21, 2017, 2:32 PM PST for 4 counties in California. It took effect at Jan 21, 2017, 7:00 PM PST. It was in force for 50 hr.

The area

The counties it named.

The facts

Issued: Jan 21, 2017, 2:32 PM PST (22:32 UTC)
In effect from: Jan 21, 2017, 7:00 PM PST
Expired: Jan 23, 2017, 9:27 PM PST
In force: 50 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 22:33 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

Reno, NV (KREV), launched 12:00Z, 10.5 hours before the alert went out and 475 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: 1131 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 237 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 21, 4:29 AM PST, 10 hours 3 minutes earlier.

Area forecast discussion, Jan 21, 4:29 AM PST, 10 hours 3 minutes before

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Hazardous weather outlook, Jan 21, 4:12 AM PST, 10 hours 20 minutes before

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In the hours before

Local storm report, Jan 21, 12:35 PM PST, 1 hour 57 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
Jan 20, 9:07 PM PST	Storm Warning	EKA		29 hr
Jan 21, 3:34 AM PST	High Wind Warning	EKA	Del Norte, Humboldt, Mendocino	23 hr
Jan 21, 3:34 AM PST	Wind Advisory	EKA	Humboldt, Mendocino	22 hr
Jan 21, 2:32 PM PST	Winter Storm Warning	EKA	Trinity	21 hr
Jan 21, 3:45 PM PST	River Flood Warning	EKA	Mendocino	26 hr
Jan 21, 3:56 PM PST	High Surf Advisory	EKA	Del Norte, Humboldt, Mendocino	6 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.