Alert archive / California / Frost Advisories in 2012
Frost Advisory 3, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this frost advisory at Nov 9, 2012, 6:42 PM PST for 4 counties in California. It took effect at Nov 10, 2012, 2:00 AM PST. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Nov 9, 2012, 6:42 PM PST (02:42 UTC)
- In effect from
- Nov 10, 2012, 2:00 AM PST
- Expired
- Nov 10, 2012, 8:00 AM PST
- In force
- 6 hr
- Issued by
- NWS San Francisco Bay Area, CA
Counties Marin County, CA, Monterey County, CA, Napa County, CA, Sonoma County, CA
The radar
The San Francisco radar (KMUX), 84 km from the middle of the area, began a volume at 02:45 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, 2.7 hours before the alert went out and 16 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
- 1397 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
971 WWUS76 KMTR 100242 NPWMTR URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 642 PM PST FRI NOV 9 2012 ...AREAS OF FROST LIKELY LATE TONIGHT AND EARLY SATURDAY MORNING IN THE COOLEST INTERIOR VALLEYS OF THE NORTH BAY AS WELL AS SOUTHERN MONTEREY COUNTY... .A COOL AIRMASS HAD SETTLED ACROSS NORTHERN AND CENTRAL CALIFORNIA ON FRIDAY. SKIES WILL BE MOSTLY CLEAR OVERNIGHT FOR INLAND AREAS WHICH WILL ALLOW TEMPERATURES TO FALL INTO THE LOWER TO MID 30S IN THE COOLEST INLAND VALLEYS. AREAS OF FROST ARE EXPECTED LATE FRIDAY NIGHT INTO EARLY SATURDAY MORNING. SATURDAY NIGHT IS ALSO EXPECTED TO BE COOL WITH FROST ONCE AGAIN POSSIBLE THEN. CAZ506-507-101600- /O.NEW.KMTR.FR.Y.0003.121110T1000Z-121110T1600Z/ NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS- 642 PM PST FRI NOV 9 2012 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PST SATURDAY... THE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA HAS ISSUED A FROST ADVISORY...WHICH IS IN EFFECT FROM 2 AM TO 8 AM PST SATURDAY FOR INTERIOR SECTIONS OF THE NORTH BAY. * TEMPERATURE: OVERNIGHT LOWS ARE EXPECTED TO BE IN THE LOWER TO MID 30S. THE COLDEST LOCATIONS MAY SEE TEMPERATURES BRIEFLY DROP TO AROUND FREEZING. * TIMING: THE COLDEST TEMPERATURES WILL OCCUR FOR A FEW HOURS AROUND SUNRISE ON SATURDAY MORNING. * IMPACTS: SENSITIVE VEGETATION MAY BE DAMAGED BY FROST. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE DAMAGED IF LEFT UNCOVERED. && $$ CAZ516-101600- /O.NEW.KMTR.FR.Y.0003.121110T1000Z-121110T1600Z/ SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO- 642 PM PST FRI NOV 9 2012 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PST SATURDAY... THE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA HAS ISSUED A FROST ADVISORY...WHICH IS IN EFFECT FROM 2 AM TO 8 AM PST SATURDAY FOR THE SOUTHERN SALINAS VALLEY AND OTHER INTERIOR VALLEYS OF SOUTHERN MONTEREY COUNTY. * TEMPERATURE: OVERNIGHT LOWS ARE EXPECTED TO BE IN THE LOWER TO MID 30S. THE COLDEST LOCATIONS MAY SEE TEMPERATURES BRIEFLY DROP TO AROUND FREEZING. * TIMING: THE COLDEST TEMPERATURES WILL OCCUR FOR A FEW HOURS AROUND SUNRISE ON SATURDAY MORNING. * IMPACTS: SENSITIVE VEGETATION MAY BE DAMAGED BY FROST. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE DAMAGED IF LEFT UNCOVERED. && $$ DYKEMA
1 follow-up statement
304 WWUS76 KMTR 101551 NPWMTR URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 751 AM PST SAT NOV 10 2012 CAZ506-507-101700- /O.EXP.KMTR.FR.Y.0003.000000T0000Z-121110T1600Z/ NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS- 751 AM PST SAT NOV 10 2012 ...FROST ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING... THE FROST ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING. TEMPERATURES WILL CONTINUE TO RISE THROUGH THE MORNING HOURS. THEREFORE...THE FROST ADVISORY WILL BE ALLOW TO EXPIRE. $$ CAZ516-101700- /O.EXP.KMTR.FR.Y.0003.000000T0000Z-121110T1600Z/ SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO- 751 AM PST SAT NOV 10 2012 ...FROST ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING... THE FROST ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING. TEMPERATURES WILL CONTINUE TO RISE THROUGH THE MORNING HOURS. THEREFORE...THE FROST ADVISORY WILL BE ALLOW TO EXPIRE. $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 10, 10:13 AM PST | Frost Advisory | MTR | Marin, Monterey, Napa, Sonoma | 22 hr |
Nearby
Frost Advisories in California, 2012Every frost advisory in 2012
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.