Alert archive / California / Frost Advisories in 2020
Frost Advisory 35, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Nov 8, 2020, 3:05 AM PST for Del Norte County, Mendocino County, California. It took effect at Nov 9, 2020, 12:00 AM PST. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Nov 8, 2020, 3:05 AM PST (11:05 UTC)
- In effect from
- Nov 9, 2020, 12:00 AM PST
- Expired
- Nov 9, 2020, 9:00 AM PST
- In force
- 9 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 51 km from the middle of the area, began a volume at 11:08 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
Oakland, CA (KOAK), launched 00:00Z, 11.1 hours before the alert went out and 343 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
- 1731 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this frost 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 frost advisory went out at Nov 7, 3:01 PM PST, 12 hours 4 minutes earlier.
Area forecast discussion, Nov 7, 3:01 PM PST, 12 hours 4 minutes before
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</html>Hazardous weather outlook, Nov 7, 2:52 PM PST, 12 hours 13 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 |
|---|---|---|---|---|
| Nov 8, 3:05 AM PST | Freeze Warning | EKA | Humboldt, Lake, Mendocino | 30 hr |
| Nov 8, 3:05 AM PST | Hard Freeze Warning | EKA | Del Norte, Humboldt, Mendocino | 30 hr |
Nearby
Frost Advisories in California, 2020Every frost 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.