Alert archive / California / Frost Advisories in 2021
Frost Advisory 5, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this frost advisory at Nov 23, 2021, 1:46 PM PST for 7 counties in California. It took effect at Nov 24, 2021, 3:00 AM PST. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Nov 23, 2021, 1:46 PM PST (21:46 UTC)
- In effect from
- Nov 24, 2021, 3:00 AM PST
- Expired
- Nov 24, 2021, 9:00 AM PST
- In force
- 6 hr
- Issued by
- NWS San Francisco Bay Area, CA
Counties Alameda County, CA, Contra Costa County, CA, Marin County, CA, Monterey County, CA, Napa County, CA, San Benito County, CA, Sonoma County, CA
The radar
The San Francisco radar (KMUX), 56 km from the middle of the area, began a volume at 21:47 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 12:00Z, 9.8 hours before the alert went out and 17 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
- 1744 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
025 WWUS76 KMTR 232146 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 146 PM PST Tue Nov 23 2021 CAZ510-516-518-240600- /O.NEW.KMTR.FR.Y.0005.211124T1100Z-211124T1700Z/ East Bay Interior Valleys- 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 Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, San Ramon, Greenfield, and King City 146 PM PST Tue Nov 23 2021 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM PST WEDNESDAY... * WHAT...Overnight low temperatures for the interior valleys will be in low to mid 30s tonight and will result in frost formation. * WHERE...East Bay Interior Valleys, Southern Salinas Valley/Arroyo Seco and Lake San Antonio and Mountains Of San Benito County and Interior Monterey County Including Pinnacles National Park. * WHEN...Several hours of temperatures at freezing are expected early Wednesday morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && ED $$ For more information from the National Weather Service visit http://weather.gov/mtr
3 follow-up statements
812 WWUS76 KMTR 240306 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 706 PM PST Tue Nov 23 2021 CAZ506-241200- /O.EXA.KMTR.FR.Y.0005.211124T1100Z-211124T1700Z/ North Bay Interior Valleys- Including the cities of Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, and Rohnert Park 706 PM PST Tue Nov 23 2021 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM PST WEDNESDAY... * WHAT...Overnight low temperatures for the interior valleys will be in low to mid 30s tonight and will result in frost formation. * WHERE...North Bay Interior Valleys. * WHEN...From 3 AM to 9 AM PST Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants and sensitive animals from the cold. && $$ CAZ510-516-518-241200- /O.CON.KMTR.FR.Y.0005.211124T1100Z-211124T1700Z/ East Bay Interior Valleys- 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 Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, San Ramon, Greenfield, and King City 706 PM PST Tue Nov 23 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM PST WEDNESDAY... * WHAT...Overnight low temperatures for the interior valleys will be in low to mid 30s tonight and will result in frost formation. * WHERE...Southern Salinas Valley/Arroyo Seco and Lake San Antonio, East Bay Interior Valleys and Mountains Of San Benito County and Interior Monterey County Including Pinnacles National Park. * WHEN...From 3 AM to 9 AM PST Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants and sensitive animals from the cold. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
048 WWUS76 KMTR 240925 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 125 AM PST Wed Nov 24 2021 CAZ510-516-518-241700- /O.CON.KMTR.FR.Y.0005.211124T1100Z-211124T1700Z/ East Bay Interior Valleys- Southern Salinas Valley/Arroyo Seco and Lake San Antonio- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, San Ramon, Greenfield, and King City 125 AM PST Wed Nov 24 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Low temperatures for the interior valleys will be in low to mid 30s and will result in frost formation. * WHERE...Southern Salinas Valley/Arroyo Seco and Lake San Antonio, East Bay Interior Valleys and Mountains Of San Benito County and Interior Monterey County Including Pinnacles National Park. * WHEN...From 3 AM to 9 AM PST Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ506-241700- /O.CON.KMTR.FR.Y.0005.211124T1100Z-211124T1700Z/ North Bay Interior Valleys- Including the cities of Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, and Rohnert Park 125 AM PST Wed Nov 24 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Low temperatures for the interior valleys will be in low to mid 30s and will result in frost formation. * WHERE...North Bay Interior Valleys. * WHEN...From 3 AM to 9 AM PST Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
824 WWUS76 KMTR 241656 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 856 AM PST Wed Nov 24 2021 CAZ510-516-518-241800- /O.EXP.KMTR.FR.Y.0005.000000T0000Z-211124T1700Z/ East Bay Interior Valleys- Southern Salinas Valley/Arroyo Seco and Lake San Antonio- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, San Ramon, Greenfield, and King City 856 AM PST Wed Nov 24 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PST THIS MORNING... Daytime heating will quickly allow temps to bounce back into the 50s and 60s this morning. $$ CAZ506-241800- /O.EXP.KMTR.FR.Y.0005.000000T0000Z-211124T1700Z/ North Bay Interior Valleys- Including the cities of Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, and Rohnert Park 856 AM PST Wed Nov 24 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PST THIS MORNING... Daytime heating will quickly allow temps to bounce back into the 50s and 60s this morning. $$ For more information from the National Weather Service visit http://weather.gov/mtr
Nearby
Frost Advisories in California, 2021Every frost advisory 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.