Alert archive / California / Freeze Warnings in 2021
Freeze Warning 5, NWS Las Vegas, NV
NWS Las Vegas, NV issued this freeze warning at Dec 10, 2021, 1:05 AM PST for San Bernardino County, California; Clark County, Nevada. It took effect at Dec 11, 2021, 12:00 AM PST. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Dec 10, 2021, 1:05 AM PST (09:05 UTC)
- In effect from
- Dec 11, 2021, 12:00 AM PST
- Expired
- Dec 11, 2021, 8:00 AM PST
- In force
- 8 hr
- Issued by
- NWS Las Vegas, NV
Counties San Bernardino County, CA, Clark County, NV
The radar
The Las Vegas radar (KESX), 67 km from the middle of the area, began a volume at 09:05 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
Las Vegas, NV (KVEF), launched 00:00Z, 9.1 hours before the alert went out and 94 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
- 1539 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
646 WWUS75 KVEF 100905 NPWVEF URGENT - WEATHER MESSAGE National Weather Service Las Vegas NV 105 AM PST Fri Dec 10 2021 CAZ523>525-NVZ016-020-021-110800- /O.UPG.KVEF.FZ.A.0001.211211T0800Z-211211T1600Z/ /O.NEW.KVEF.FZ.W.0005.211211T0800Z-211211T1600Z/ Western Mojave Desert-Eastern Mojave Desert-Morongo Basin- Northeast Clark County-Las Vegas Valley- Lake Mead National Recreation Area- Including Barstow, Daggett, Fort Irwin, Baker, Mountain Pass, Mitchell Caverns, Morongo Valley, Yucca Valley, Twentynine Palms, Mesquite, Overton, Moapa, Las Vegas, North Las Vegas, Henderson, Boulder City, Hoover Dam, and Laughlin 105 AM PST Fri Dec 10 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PST SATURDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Portions of southern Nevada and southeast California. * WHEN...From midnight tonight to 8 AM PST Saturday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ Morgan For more information from the National Weather Service visit https://weather.gov/lasvegas
2 follow-up statements
793 WWUS75 KVEF 110704 NPWVEF URGENT - WEATHER MESSAGE National Weather Service Las Vegas NV 1104 PM PST Fri Dec 10 2021 CAZ523>525-NVZ016-020-021-111600- /O.CON.KVEF.FZ.W.0005.211211T0800Z-211211T1600Z/ Western Mojave Desert-Eastern Mojave Desert-Morongo Basin- Northeast Clark County-Las Vegas Valley- Lake Mead National Recreation Area- Including Barstow, Daggett, Fort Irwin, Baker, Mountain Pass, Mitchell Caverns, Morongo Valley, Yucca Valley, Twentynine Palms, Mesquite, Overton, Moapa, Las Vegas, North Las Vegas, Henderson, Boulder City, Hoover Dam, and Laughlin 1104 PM PST Fri Dec 10 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PST SATURDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Portions of southern Nevada and southeast California. * WHEN...Until 8 AM PST Saturday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ Morgan For more information from the National Weather Service visit https://weather.gov/lasvegas
571 WWUS75 KVEF 111557 NPWVEF URGENT - WEATHER MESSAGE National Weather Service Las Vegas NV 757 AM PST Sat Dec 11 2021 CAZ523>525-NVZ016-020-021-111700- /O.EXP.KVEF.FZ.W.0005.000000T0000Z-211211T1600Z/ Western Mojave Desert-Eastern Mojave Desert-Morongo Basin- Northeast Clark County-Las Vegas Valley- Lake Mead National Recreation Area- Including Barstow, Daggett, Fort Irwin, Baker, Mountain Pass, Mitchell Caverns, Morongo Valley, Yucca Valley, Twentynine Palms, Mesquite, Overton, Moapa, Las Vegas, North Las Vegas, Henderson, Boulder City, Hoover Dam, and Laughlin 757 AM PST Sat Dec 11 2021 ...FREEZE WARNING WILL EXPIRE AT 8 AM PST THIS MORNING... Widespread freezing temperatures occured across parts of the Mojave Desert this morning. With the rising sun, temperatures will quickly rise through the morning hours. $$ For more information from the National Weather Service visit https://weather.gov/lasvegas
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 10, 1:32 PM PST | Winter Storm Watch | VEF | Inyo | 36 hr |
Nearby
Freeze Warnings in California, 2021Freeze Warnings in Nevada, 2021Every freeze warning 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.