Alert archive / California / Freeze Warnings in 2021
Freeze Warning 3, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this freeze warning at Dec 11, 2021, 5:35 PM PST for Monterey County, San Benito County, California. It took effect at Dec 12, 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 11, 2021, 5:35 PM PST (01:35 UTC)
- In effect from
- Dec 12, 2021, 12:00 AM PST
- Expired
- Dec 12, 2021, 8:00 AM PST
- In force
- 8 hr
- Issued by
- NWS San Francisco Bay Area, CA
Counties Monterey County, CA, San Benito County, CA
The radar
The San Francisco radar (KMUX), 103 km from the middle of the area, began a volume at 01:33 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
Oakland, CA (KOAK), launched 00:00Z, 1.6 hours before the alert went out and 171 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
- 1555 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
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
308 WWUS76 KMTR 120135 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 535 PM PST Sat Dec 11 2021 CAZ516-518-121530- /O.NEW.KMTR.FZ.W.0003.211212T0800Z-211212T1600Z/ /O.CON.KMTR.WI.Y.0014.211213T0900Z-211214T0000Z/ Southern Salinas Valley/Arroyo Seco and Lake San Antonio- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of Greenfield and King City 535 PM PST Sat Dec 11 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PST SUNDAY... ...WIND ADVISORY REMAINS IN EFFECT FROM 1 AM TO 4 PM PST MONDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 33 expected. For the Wind Advisory, south winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Southern Salinas Valley/Arroyo Seco and Lake San Antonio and Mountains Of San Benito County and Interior Monterey County Including Pinnacles National Park. * WHEN...For the Freeze Warning, from midnight tonight to 8 AM PST Sunday. For the Wind Advisory, from 1 AM to 4 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. 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. && $$ CAZ006-508>513-529-121530- /O.CON.KMTR.WI.Y.0014.211213T0000Z-211213T1500Z/ San Francisco-San Francisco Bay Shoreline- San Francisco Peninsula Coast-East Bay Interior Valleys- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Clara Valley Including San Jose-Northern Monterey Bay- Including the cities of San Francisco, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, San Ramon, Blackhawk, Scotts Valley, Boulder Creek, Day Valley, San Jose, Santa Cruz, Watsonville, and Live Oak 535 PM PST Sat Dec 11 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 4 PM SUNDAY TO 7 AM PST MONDAY... * WHAT...South winds 15 to 25 mph with gusts up to 55 mph expected. * WHERE...Portions of northern California. * WHEN...From 4 PM Sunday to 7 AM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ517-528-530-121530- /O.CON.KMTR.WI.Y.0014.211213T0900Z-211214T0000Z/ Santa Lucia Mountains and Los Padres National Forest- Northern Salinas Valley/Hollister Valley and Carmel Valley- Southern Monterey Bay and Big Sur Coast- Including the cities of Salinas, Seaside, Monterey, and Marina 535 PM PST Sat Dec 11 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 1 AM TO 4 PM PST MONDAY... * WHAT...South winds 20 to 30 mph with gusts up to 60 mph expected. * WHERE...Santa Lucia Mountains and Los Padres National Forest, Southern Monterey Bay and Big Sur Coast and Northern Salinas Valley/Hollister Valley and Carmel Valley. * WHEN...From 1 AM to 4 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
3 follow-up statements
677 WWUS76 KMTR 120622 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 1022 PM PST Sat Dec 11 2021 CAZ516-518-121600- /O.CON.KMTR.FZ.W.0003.211212T0800Z-211212T1600Z/ /O.CON.KMTR.WI.Y.0014.211213T0900Z-211214T0000Z/ Southern Salinas Valley/Arroyo Seco and Lake San Antonio- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of Greenfield and King City 1022 PM PST Sat Dec 11 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PST SUNDAY... ...WIND ADVISORY REMAINS IN EFFECT FROM 1 AM TO 4 PM PST MONDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 23 expected. For the Wind Advisory, south winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Mountains Of San Benito County and Interior Monterey County Including Pinnacles National Park and Southern Salinas Valley/Arroyo Seco and Lake San Antonio. * WHEN...For the Freeze Warning, from midnight tonight to 8 AM PST Sunday. For the Wind Advisory, from 1 AM to 4 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ CAZ006-508>513-529-121600- /O.CON.KMTR.WI.Y.0014.211213T0000Z-211213T1500Z/ San Francisco-San Francisco Bay Shoreline- San Francisco Peninsula Coast-East Bay Interior Valleys- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Clara Valley Including San Jose-Northern Monterey Bay- Including the cities of San Francisco, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, San Ramon, Blackhawk, Scotts Valley, Boulder Creek, Day Valley, San Jose, Santa Cruz, Watsonville, and Live Oak 1022 PM PST Sat Dec 11 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 4 PM SUNDAY TO 7 AM PST MONDAY... * WHAT...South winds 15 to 25 mph with gusts up to 55 mph expected. * WHERE...Portions of northern California. * WHEN...From 4 PM Sunday to 7 AM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ517-528-530-121600- /O.CON.KMTR.WI.Y.0014.211213T0900Z-211214T0000Z/ Santa Lucia Mountains and Los Padres National Forest- Northern Salinas Valley/Hollister Valley and Carmel Valley- Southern Monterey Bay and Big Sur Coast- Including the cities of Salinas, Seaside, Monterey, and Marina 1022 PM PST Sat Dec 11 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 1 AM TO 4 PM PST MONDAY... * WHAT...South winds 20 to 30 mph with gusts up to 60 mph expected. * WHERE...Santa Lucia Mountains and Los Padres National Forest, Southern Monterey Bay and Big Sur Coast and Northern Salinas Valley/Hollister Valley and Carmel Valley. * WHEN...From 1 AM to 4 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
377 WWUS76 KMTR 121127 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 327 AM PST Sun Dec 12 2021 CAZ516-518-121930- /O.CON.KMTR.FZ.W.0003.000000T0000Z-211212T1600Z/ /O.CON.KMTR.WI.Y.0014.211213T0900Z-211214T0000Z/ Southern Salinas Valley/Arroyo Seco and Lake San Antonio- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of Greenfield and King City 327 AM PST Sun Dec 12 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... ...WIND ADVISORY REMAINS IN EFFECT FROM 1 AM TO 4 PM PST MONDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 23 expected. For the Wind Advisory, south winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Mountains Of San Benito County and Interior Monterey County Including Pinnacles National Park and Southern Salinas Valley/Arroyo Seco and Lake San Antonio. * WHEN...For the Freeze Warning, from midnight tonight to 8 AM PST Sunday. For the Wind Advisory, from 1 AM to 4 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. 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. && $$ CAZ006-508>513-529-121930- /O.CON.KMTR.WI.Y.0014.211213T0000Z-211213T1500Z/ San Francisco-San Francisco Bay Shoreline- San Francisco Peninsula Coast-East Bay Interior Valleys- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Clara Valley Including San Jose-Northern Monterey Bay- Including the cities of San Francisco, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, San Ramon, Blackhawk, Scotts Valley, Boulder Creek, Day Valley, San Jose, Santa Cruz, Watsonville, and Live Oak 327 AM PST Sun Dec 12 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 4 PM THIS AFTERNOON TO 7 AM PST MONDAY... * WHAT...South winds 15 to 25 mph with gusts up to 55 mph expected. * WHERE...Portions of northern California. * WHEN...From 4 PM Sunday to 7 AM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ517-528-530-121930- /O.CON.KMTR.WI.Y.0014.211213T0900Z-211214T0000Z/ Santa Lucia Mountains and Los Padres National Forest- Northern Salinas Valley/Hollister Valley and Carmel Valley- Southern Monterey Bay and Big Sur Coast- Including the cities of Salinas, Seaside, Monterey, and Marina 327 AM PST Sun Dec 12 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 1 AM TO 4 PM PST MONDAY... * WHAT...South winds 20 to 30 mph with gusts up to 60 mph expected. * WHERE...Santa Lucia Mountains and Los Padres National Forest, Southern Monterey Bay and Big Sur Coast and Northern Salinas Valley/Hollister Valley and Carmel Valley. * WHEN...From 1 AM to 4 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
426 WWUS76 KMTR 121555 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 755 AM PST Sun Dec 12 2021 CAZ516-518-130700- /O.EXP.KMTR.FZ.W.0003.000000T0000Z-211212T1600Z/ /O.CON.KMTR.WI.Y.0014.211213T0900Z-211214T0000Z/ Southern Salinas Valley/Arroyo Seco and Lake San Antonio- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of Greenfield and King City 755 AM PST Sun Dec 12 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 1 AM TO 4 PM PST MONDAY... ...FREEZE WARNING WILL EXPIRE AT 8 AM PST THIS MORNING... * WHAT...South winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Mountains Of San Benito County and Interior Monterey County Including Pinnacles National Park and Southern Salinas Valley/Arroyo Seco and Lake San Antonio. * WHEN...From 1 AM to 4 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ006-508>513-529-130700- /O.CON.KMTR.WI.Y.0014.211213T0000Z-211213T1500Z/ San Francisco-San Francisco Bay Shoreline- San Francisco Peninsula Coast-East Bay Interior Valleys- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Clara Valley Including San Jose-Northern Monterey Bay- Including the cities of San Francisco, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, San Ramon, Blackhawk, Scotts Valley, Boulder Creek, Day Valley, San Jose, Santa Cruz, Watsonville, and Live Oak 755 AM PST Sun Dec 12 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 4 PM THIS AFTERNOON TO 7 AM PST MONDAY... * WHAT...South winds 15 to 25 mph with gusts up to 55 mph expected. * WHERE...Portions of northern California. * WHEN...From 4 PM this afternoon to 7 AM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ517-528-530-130700- /O.CON.KMTR.WI.Y.0014.211213T0900Z-211214T0000Z/ Santa Lucia Mountains and Los Padres National Forest- Northern Salinas Valley/Hollister Valley and Carmel Valley- Southern Monterey Bay and Big Sur Coast- Including the cities of Salinas, Seaside, Monterey, and Marina 755 AM PST Sun Dec 12 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 1 AM TO 4 PM PST MONDAY... * WHAT...South winds 20 to 30 mph with gusts up to 60 mph expected. * WHERE...Santa Lucia Mountains and Los Padres National Forest, Southern Monterey Bay and Big Sur Coast and Northern Salinas Valley/Hollister Valley and Carmel Valley. * WHEN...From 1 AM to 4 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 12, 8:41 AM PST | Flash Flood Watch | MTR | Monterey, San Benito, San Mateo, Santa Clara, Santa Cruz | 40 hr |
| Dec 12, 11:55 AM PST | High Wind Warning | MTR | Monterey, San Benito | 34 hr |
Nearby
Freeze Warnings in California, 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.