Alert archive / California / Wind Advisories in 2021
Wind Advisory 11, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this wind advisory at Oct 19, 2021, 1:39 PM PDT for 9 counties in California. It took effect at Oct 19, 2021, 8:00 PM PDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Oct 19, 2021, 1:39 PM PDT (20:39 UTC)
- In effect from
- Oct 19, 2021, 8:00 PM PDT
- Expired
- Oct 20, 2021, 3:16 AM PDT
- In force
- 7 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, Napa County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Sonoma County, CA
The radar
The San Francisco radar (KMUX), 78 km from the middle of the area, began a volume at 20:39 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, 8.7 hours before the alert went out and 9 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
- 856 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 126 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
131 WWUS76 KMTR 192039 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 139 PM PDT Tue Oct 19 2021 ...Gusty Southerly Winds Overnight... CAZ006-505-506-508-509-201100- /O.NEW.KMTR.WI.Y.0011.211020T0300Z-211020T1100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- North Bay Interior Valleys-San Francisco Bay Shoreline- San Francisco Peninsula Coast- Including the cities of San Francisco, Tamalpais-Homestead, Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Oakland, Fremont, Hayward, Daly City, Berkeley, and Pacifica 139 PM PDT Tue Oct 19 2021 ...WIND ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 4 AM PDT WEDNESDAY... * WHAT...South winds 15 to 25 mph with gusts 30 to 45 mph expected, locally up to or exceeding 50 mph in the windiest locations. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, North Bay Interior Valleys, San Francisco Bay Shoreline and San Francisco Peninsula Coast. * WHEN...From 8 PM this evening to 4 AM PDT Wednesday. The strongest winds are expected around to just after midnight. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...A 35 to 50 mph low level jet located a few hundred to a couple thousand feet above the surface has the potential to occasionally mix down and result in gusty southerly winds overnight. The strongest winds will be along the coast of the North Bay and San Francisco Peninsula but will also filter into portions of the San Francisco Bayshore, North Bay Valleys, and across the hills throughout the region. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
1 follow-up statement
029 WWUS76 KMTR 201016 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 316 AM PDT Wed Oct 20 2021 CAZ006-505-506-508-509-201130- /O.CAN.KMTR.WI.Y.0011.000000T0000Z-211020T1100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- North Bay Interior Valleys-San Francisco Bay Shoreline- San Francisco Peninsula Coast- Including the cities of San Francisco, Tamalpais-Homestead, Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato, Rohnert Park, Oakland, Fremont, Hayward, Daly City, Berkeley, and Pacifica 316 AM PDT Wed Oct 20 2021 ...WIND ADVISORY IS CANCELLED... While breezy to locally gusty winds to around 30 mph will be possible this morning, wind speeds are no longer anticipated to reach advisory criteria. $$ 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 |
|---|---|---|---|---|
| Oct 19, 2:05 AM PDT | Gale Warning | MTR | 25 hr | |
| Oct 19, 2:05 AM PDT | Small Craft Advisory | MTR | 5 days | |
| Oct 19, 2:05 AM PDT | Small Craft Advisory | MTR | 12 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.