Alert archive / California / Freeze Watches in 2021
Freeze Watch 4, NWS Los Angeles, CA
NWS Los Angeles, CA issued this freeze watch at Dec 9, 2021, 12:48 PM PST for Santa Barbara County, California. It took effect at Dec 11, 2021, 12:00 AM PST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Dec 9, 2021, 12:48 PM PST (20:48 UTC)
- In effect from
- Dec 11, 2021, 12:00 AM PST
- Expired
- Dec 10, 2021, 3:08 AM PST
- In force
- Issued by
- NWS Los Angeles, CA
County Santa Barbara County, CA
The radar
The Vandenberg AFB radar (KVBX), 47 km from the middle of the area, began a volume at 20:50 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
San Diego, CA (KNKX), launched 12:00Z, 8.8 hours before the alert went out and 326 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
- 9 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 696 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this freeze watch 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 freeze watch went out at Dec 9, 10:35 AM PST, 2 hours 13 minutes earlier.
Area forecast discussion, Dec 9, 10:35 AM PST, 2 hours 13 minutes 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 |
|---|---|---|---|---|
| Dec 9, 12:48 PM PST | Hard Freeze Watch | LOX | 14 hr |
Nearby
Freeze Watches in California, 2021Every freeze watch in 2021
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.