Alert archive / California / Wind Advisories in 2021
Wind Advisory 7, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this wind advisory at May 18, 2021, 4:47 AM PDT for 11 counties in California. It took effect at May 19, 2021, 5:00 PM PDT. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- May 18, 2021, 4:47 AM PDT (11:47 UTC)
- In effect from
- May 19, 2021, 5:00 PM PDT
- Expired
- May 20, 2021, 5:00 AM PDT
- In force
- 12 hr
- Issued by
- NWS San Francisco Bay Area, CA
Counties Alameda County, CA, City and County of San Francisco, CA, Contra Costa County, CA, Marin County, CA, Monterey County, CA, Napa County, CA, San Benito County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Sonoma County, CA
The radar
The San Francisco radar (KMUX), 46 km from the middle of the area, began a volume at 11:45 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, 11.8 hours before the alert went out and 24 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
- 643 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
237 WWUS76 KMTR 181147 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 447 AM PDT Tue May 18 2021 CAZ006-505>509-511-512-517-518-182000- /O.NEW.KMTR.WI.Y.0007.210520T0000Z-210520T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- North Bay Interior Valleys-North Bay Mountains- San Francisco Bay Shoreline-San Francisco Peninsula Coast- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Lucia Mountains and Los Padres National Forest- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of San Francisco, Tamalpais-Homestead, Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Angwin, Lagunitas-Forest Knolls, Woodacre, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Blackhawk, Scotts Valley, Boulder Creek, and Day Valley 447 AM PDT Tue May 18 2021 ...WIND ADVISORY IN EFFECT FROM 5 PM WEDNESDAY TO 5 AM PDT THURSDAY... * WHAT...Northwest winds 15 to 25 mph with gusts 40 to 50 mph expected. * WHERE...North Bay, SF Metro and SF Peninsula, SF Bay shoreline, East Bay Hills, Santa Cruz Mountains, Santa Lucia Mountains, and mountains in San Benito County. * WHEN...From 5 PM Wednesday to 5 AM PDT Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. High profile vehicles may have difficulty driving in gusty conditions. * ADDITIONAL DETAILS...Locally strong gusts may begin earlier Wednesday afternoon, but won't become widespread until after 5 pm. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
6 follow-up statements
853 WWUS76 KMTR 181955 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 1255 PM PDT Tue May 18 2021 CAZ006-505>509-511-512-517-518-190400- /O.CON.KMTR.WI.Y.0007.210520T0000Z-210520T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- North Bay Interior Valleys-North Bay Mountains- San Francisco Bay Shoreline-San Francisco Peninsula Coast- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Lucia Mountains and Los Padres National Forest- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of San Francisco, Tamalpais-Homestead, Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Angwin, Lagunitas-Forest Knolls, Woodacre, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Blackhawk, Scotts Valley, Boulder Creek, and Day Valley 1255 PM PDT Tue May 18 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 5 PM WEDNESDAY TO 5 AM PDT THURSDAY... * WHAT...Northwest winds 15 to 25 mph with gusts up to 40-50 mph expected. * WHERE...North Bay, SF Metro and SF Peninsula, SF Bay shoreline, East Bay Hills, Santa Cruz Mountains, Santa Lucia Mountains, Diablo and Gabilan Mountains. * WHEN...From 5 PM Wednesday to 5 AM PDT Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Locally strong gusts may begin Wednesday morning, but won't become widespread until after 5 pm. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
027 WWUS76 KMTR 190335 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 835 PM PDT Tue May 18 2021 CAZ006-505>509-511-512-517-518-191200- /O.CON.KMTR.WI.Y.0007.210520T0000Z-210520T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- North Bay Interior Valleys-North Bay Mountains- San Francisco Bay Shoreline-San Francisco Peninsula Coast- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Lucia Mountains and Los Padres National Forest- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of San Francisco, Tamalpais-Homestead, Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Angwin, Lagunitas-Forest Knolls, Woodacre, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Blackhawk, Scotts Valley, Boulder Creek, and Day Valley 835 PM PDT Tue May 18 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 5 PM WEDNESDAY TO 5 AM PDT THURSDAY... * WHAT...Northwest winds 15 to 25 mph with gusts up to 40-50 mph expected. * WHERE...North Bay, SF Metro and SF Peninsula, SF Bay shoreline, East Bay Hills, Santa Cruz Mountains, Santa Lucia Mountains, Diablo and Gabilan Mountains. * WHEN...From 5 PM Wednesday to 5 AM PDT Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Locally strong gusts may begin Wednesday morning, but won't become widespread until after 5 pm. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
899 WWUS76 KMTR 191151 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 451 AM PDT Wed May 19 2021 CAZ006-505>509-511-512-517-518-192000- /O.CON.KMTR.WI.Y.0007.210520T0000Z-210520T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- North Bay Interior Valleys-North Bay Mountains- San Francisco Bay Shoreline-San Francisco Peninsula Coast- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Lucia Mountains and Los Padres National Forest- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of San Francisco, Tamalpais-Homestead, Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Angwin, Lagunitas-Forest Knolls, Woodacre, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Blackhawk, Scotts Valley, Boulder Creek, and Day Valley 451 AM PDT Wed May 19 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 AM PDT THURSDAY... * WHAT...Northwest winds 15 to 25 mph with gusts up to 40-50 mph expected. * WHERE...North Bay, SF Metro and SF Peninsula, SF Bay shoreline, East Bay Hills, Santa Cruz Mountains, Santa Lucia Mountains, Diablo and Gabilan Mountains. * WHEN...From 5 PM Wednesday to 5 AM PDT Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Locally strong gusts may begin Wednesday morning, especially along the coast, but won't become widespread inland until around 5 pm. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
821 WWUS76 KMTR 192006 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 106 PM PDT Wed May 19 2021 CAZ006-505>509-511-512-517-518-200500- /O.CON.KMTR.WI.Y.0007.210520T0000Z-210520T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- North Bay Interior Valleys-North Bay Mountains- San Francisco Bay Shoreline-San Francisco Peninsula Coast- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Lucia Mountains and Los Padres National Forest- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of San Francisco, Tamalpais-Homestead, Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Angwin, Lagunitas-Forest Knolls, Woodacre, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Blackhawk, Scotts Valley, Boulder Creek, and Day Valley 106 PM PDT Wed May 19 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 AM PDT THURSDAY... * WHAT...Northwest winds 15 to 25 mph with gusts in excess of 45 mph expected. * WHERE...North Bay, SF Metro and SF Peninsula, SF Bay shoreline, East Bay Hills, Santa Cruz Mountains, Santa Lucia Mountains, Diablo and Gabilan Mountains. * WHEN...From 5 PM Wednesday to 5 AM PDT Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Locally gusty winds can be expected through early Wednesday afternoon especially along the coast, but won't become widespread inland until around 5 PM PDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
923 WWUS76 KMTR 200411 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 911 PM PDT Wed May 19 2021 CAZ006-505>509-511-512-517-518-201145- /O.CON.KMTR.WI.Y.0007.000000T0000Z-210520T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- North Bay Interior Valleys-North Bay Mountains- San Francisco Bay Shoreline-San Francisco Peninsula Coast- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Lucia Mountains and Los Padres National Forest- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of San Francisco, Tamalpais-Homestead, Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Angwin, Lagunitas-Forest Knolls, Woodacre, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Blackhawk, Scotts Valley, Boulder Creek, and Day Valley 911 PM PDT Wed May 19 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 AM PDT THURSDAY... * WHAT...Northwest winds 15 to 25 mph with gusts 45 to 55 mph. * WHERE...North Bay, SF Metro and SF Peninsula, SF Bay shoreline, East Bay Hills, Santa Cruz Mountains, Santa Lucia Mountains, Diablo and Gabilan Mountains. * WHEN...Through 5 AM PDT Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Winds will slowly ease through the overnight hours into early Thursday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
456 WWUS76 KMTR 201135 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 435 AM PDT Thu May 20 2021 CAZ006-505>509-511-512-517-518-201245- /O.EXP.KMTR.WI.Y.0007.000000T0000Z-210520T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- North Bay Interior Valleys-North Bay Mountains- San Francisco Bay Shoreline-San Francisco Peninsula Coast- East Bay Hills and the Diablo Range-Santa Cruz Mountains- Santa Lucia Mountains and Los Padres National Forest- Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park- Including the cities of San Francisco, Tamalpais-Homestead, Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Angwin, Lagunitas-Forest Knolls, Woodacre, Oakland, Fremont, Hayward, Daly City, Berkeley, Pacifica, Blackhawk, Scotts Valley, Boulder Creek, and Day Valley 435 AM PDT Thu May 20 2021 ...WIND ADVISORY WILL EXPIRE AT 5 AM PDT EARLY THIS MORNING... Winds have eased overnight, but still remain breezy to gusty at times. Therefore, the Wind Advisory will be allowed to expire. Breezy to gusty winds will linger through this afternoon. $$ 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 |
|---|---|---|---|---|
| May 18, 2:55 AM PDT | Gale Warning | MTR | 3 days | |
| May 18, 2:55 AM PDT | Small Craft Advisory | MTR | 36 hr |
Nearby
Wind Advisories in California, 2021Every wind 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.