Alert archive / California / Frost Advisories in 2020
Frost Advisory 5, NWS Los Angeles, CA
NWS Los Angeles, CA issued this frost advisory at Nov 8, 2020, 8:21 AM PST for Los Angeles County, California. It took effect at Nov 9, 2020, 1:00 AM PST. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Nov 8, 2020, 8:21 AM PST (16:21 UTC)
- In effect from
- Nov 9, 2020, 1:00 AM PST
- Expired
- Nov 9, 2020, 8:00 AM PST
- In force
- 7 hr
- Issued by
- NWS Los Angeles, CA
County Los Angeles County, CA
The radar
The Santa Ana Mts radar (KSOX), 71 km from the middle of the area, began a volume at 16:25 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
San Diego, CA (KNKX), launched 12:00Z, 4.4 hours before the alert went out and 184 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
- 45 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 844 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 138 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 Los Angeles, CA wrote its last area forecast discussion before this frost advisory went out at Nov 7, 3:21 PM PST, 17 hours earlier.
Area forecast discussion, Nov 7, 3:21 PM PST, 17 hours before
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</html>The office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 8, 3:31 AM PST | Freeze Warning | LOX | 28 hr | |
| Nov 8, 3:31 AM PST | Hard Freeze Warning | LOX | Santa Barbara | 28 hr |
| Nov 8, 12:28 PM PST | Gale Warning | LOX | 9 hr | |
| Nov 8, 12:47 PM PST | Freeze Watch | LOX | 24 hr | |
| Nov 8, 12:47 PM PST | Hard Freeze Watch | LOX | Santa Barbara | 24 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.