Alert archive / California / Wind Advisories in 2021
Wind Advisory 4, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this wind advisory at Feb 23, 2021, 2:36 AM PST for 5 counties in California. It took effect at Feb 24, 2021, 10:00 AM PST. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Feb 23, 2021, 2:36 AM PST (10:36 UTC)
- In effect from
- Feb 24, 2021, 10:00 AM PST
- Expired
- Feb 25, 2021, 4:00 AM PST
- In force
- 18 hr
- Issued by
- NWS San Francisco Bay Area, CA
Counties Alameda County, CA, Contra Costa County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA
The radar
The San Francisco radar (KMUX), 34 km from the middle of the area, began a volume at 10:37 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, 10.6 hours before the alert went out and 36 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
- 2626 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
183 WWUS76 KMTR 231036 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 236 AM PST Tue Feb 23 2021 ...STRONG OFFSHORE WINDS ARE EXPECTED ON WEDNESDAY INTO WEDNESDAY EVENING... .Strong and gusty northeast winds are expected to increase on Wednesday into Wednesday evening. Strongest gusts forecast to be at highest peaks and ridges of the North Bay Mountains and the East Bay Hills with strong wind gusts aloft extending as far south as the Santa Cruz Mountains. Winds have the potential to locally mix down to the valley surface, particularly in the West Delta and the East Bay Valleys. Winds are expected to diminish late Wednesday night, though remaining gusty at higher elevations into early Thursday morning. CAZ507-511-232000- /O.NEW.KMTR.WI.Y.0004.210224T1800Z-210225T0600Z/ North Bay Mountains-East Bay Hills and the Diablo Range- Including the cities of Angwin, Lagunitas-Forest Knolls, Woodacre, and Blackhawk 236 AM PST Tue Feb 23 2021 ...WIND ADVISORY IN EFFECT FROM 10 AM TO 10 PM PST WEDNESDAY... * WHAT...North winds 15 to 30 mph with gusts 40 to 50 mph, locally up to 60 mph at highest peaks. Downsloping effects will produce gusty conditions on the lee side of mountains and foothills. * WHERE...North Bay Mountains and East Bay Hills and the Diablo Range. * WHEN...From 10 AM to 10 PM PST Wednesday. * ADDITIONAL DETAILS...Strong wind gusts have the potential to knock down power lines and trees along with creating hazardous driving conditions. Be sure to plan accordingly if you travel in these areas and to secure light property outdoors including temporary outdoor structures. Have cell phones charged and flashlights handy if power outages occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ510-232000- /O.NEW.KMTR.WI.Y.0004.210224T1800Z-210225T0600Z/ East Bay Interior Valleys- Including the cities of Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, and San Ramon 236 AM PST Tue Feb 23 2021 ...WIND ADVISORY IN EFFECT FROM 10 AM TO 10 PM PST WEDNESDAY... * WHAT...North winds 10 to 20 mph with gusts 30 to 40 mph expected. * WHERE...East Bay Interior Valleys. * WHEN...From 10 AM to 10 PM PST Wednesday. * ADDITIONAL DETAILS...Strong wind gusts have the potential to knock down power lines and trees along with creating hazardous driving conditions. Be sure to plan accordingly if you travel in these areas and to secure light property outdoors including temporary outdoor structures. Have cell phones charged and flashlights handy if power outages occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ512-232000- /O.NEW.KMTR.WI.Y.0004.210224T1800Z-210225T0600Z/ Santa Cruz Mountains- Including the cities of Scotts Valley, Boulder Creek, and Day Valley 236 AM PST Tue Feb 23 2021 ...WIND ADVISORY IN EFFECT FROM 10 AM TO 10 PM PST WEDNESDAY... * WHAT...North winds 15 to 25 mph with gusts 30 to 45 mph expected. * WHERE...Santa Cruz Mountains. * WHEN...From 10 AM to 10 PM PST Wednesday. * ADDITIONAL DETAILS...Strong wind gusts have the potential to knock down power lines and trees along with creating hazardous driving conditions. Be sure to plan accordingly if you travel in these areas and to secure light property outdoors including temporary outdoor structures. Have cell phones charged and flashlights handy if power outages occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
6 follow-up statements
387 WWUS76 KMTR 240019 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 419 PM PST Tue Feb 23 2021 CAZ507-511-240600- /O.CON.KMTR.WI.Y.0004.210224T1800Z-210225T0600Z/ North Bay Mountains-East Bay Hills and the Diablo Range- Including the cities of Angwin, Lagunitas-Forest Knolls, Woodacre, and Blackhawk 419 PM PST Tue Feb 23 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 10 AM TO 10 PM PST WEDNESDAY... * WHAT...North winds 15 to 30 mph with gusts 45 to 55 mph, locally up to 70 mph at highest peaks. Downsloping effects will produce gusty conditions on the lee side of mountains and foothills. * WHERE...North Bay Mountains and East Bay Hills and the Diablo Range. * WHEN...From 10 AM to 10 PM PST Wednesday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Strong wind gusts have the potential to knock down power lines and trees along with creating hazardous driving conditions. Be sure to plan accordingly if you travel in these areas and to secure light property outdoors including temporary outdoor structures. Have cell phones charged and flashlights handy if power outages occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ510-240600- /O.CON.KMTR.WI.Y.0004.210224T1800Z-210225T0600Z/ East Bay Interior Valleys- Including the cities of Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, and San Ramon 419 PM PST Tue Feb 23 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 10 AM TO 10 PM PST WEDNESDAY... * WHAT...North winds 10 to 20 mph with gusts 35 to 45 mph expected. * WHERE...East Bay Interior Valleys. * WHEN...From 10 AM to 10 PM PST Wednesday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Strong wind gusts have the potential to knock down power lines and trees along with creating hazardous driving conditions. Be sure to plan accordingly if you travel in these areas and to secure light property outdoors including temporary outdoor structures. Have cell phones charged and flashlights handy if power outages occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ512-240600- /O.CON.KMTR.WI.Y.0004.210224T1800Z-210225T0600Z/ Santa Cruz Mountains- Including the cities of Scotts Valley, Boulder Creek, and Day Valley 419 PM PST Tue Feb 23 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 10 AM TO 10 PM PST WEDNESDAY... * WHAT...North winds 15 to 25 mph with gusts 35 to 45 mph expected. * WHERE...Santa Cruz Mountains. * WHEN...From 10 AM to 10 PM PST Wednesday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Strong wind gusts have the potential to knock down power lines and trees along with creating hazardous driving conditions. Be sure to plan accordingly if you travel in these areas and to secure light property outdoors including temporary outdoor structures. Have cell phones charged and flashlights handy if power outages occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
704 WWUS76 KMTR 240310 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 710 PM PST Tue Feb 23 2021 CAZ507-511-241400- /O.EXT.KMTR.WI.Y.0004.210224T1800Z-210225T1200Z/ North Bay Mountains-East Bay Hills and the Diablo Range- Including the cities of Angwin, Lagunitas-Forest Knolls, Woodacre, and Blackhawk 710 PM PST Tue Feb 23 2021 ...WIND ADVISORY NOW IN EFFECT FROM 10 AM WEDNESDAY TO 4 AM PST THURSDAY... * WHAT...North winds 15 to 30 mph with gusts 45 to 55 mph, locally up to 70 mph at highest peaks. Downsloping effects will produce gusty conditions on the lee side of mountains and foothills. * WHERE...North Bay Mountains and East Bay Hills and the Diablo Range. * WHEN...From 10 AM Wednesday to 4 AM PST Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Strong wind gusts have the potential to knock down power lines and trees along with creating hazardous driving conditions. Be sure to plan accordingly if you travel in these areas and to secure light property outdoors including temporary outdoor structures. Have cell phones charged and flashlights handy if power outages occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ512-241400- /O.EXT.KMTR.WI.Y.0004.210224T1800Z-210225T1200Z/ Santa Cruz Mountains- Including the cities of Scotts Valley, Boulder Creek, and Day Valley 710 PM PST Tue Feb 23 2021 ...WIND ADVISORY NOW IN EFFECT FROM 10 AM WEDNESDAY TO 4 AM PST THURSDAY... * WHAT...North winds 15 to 25 mph with gusts 35 to 45 mph expected. * WHERE...Santa Cruz Mountains. * WHEN...From 10 AM PST Wednesday TO 4 AM PST Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Strong wind gusts have the potential to knock down power lines and trees along with creating hazardous driving conditions. Be sure to plan accordingly if you travel in these areas and to secure light property outdoors including temporary outdoor structures. Have cell phones charged and flashlights handy if power outages occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ510-241400- /O.CON.KMTR.WI.Y.0004.210224T1800Z-210225T0600Z/ East Bay Interior Valleys- Including the cities of Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, and San Ramon 710 PM PST Tue Feb 23 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 10 AM TO 10 PM PST WEDNESDAY... * WHAT...North winds 10 to 20 mph with gusts 35 to 45 mph expected. * WHERE...East Bay Interior Valleys. * WHEN...From 10 AM to 10 PM PST Wednesday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Strong wind gusts have the potential to knock down power lines and trees along with creating hazardous driving conditions. Be sure to plan accordingly if you travel in these areas and to secure light property outdoors including temporary outdoor structures. Have cell phones charged and flashlights handy if power outages occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
032 WWUS76 KMTR 241430 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 630 AM PST Wed Feb 24 2021 CAZ507-511-242230- /O.CON.KMTR.WI.Y.0004.210224T1800Z-210225T1200Z/ North Bay Mountains-East Bay Hills and the Diablo Range- Including the cities of Angwin, Lagunitas-Forest Knolls, Woodacre, and Blackhawk 630 AM PST Wed Feb 24 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 4 AM PST THURSDAY... * WHAT...North winds 15 to 30 mph with gusts 45 to 55 mph, locally up to 70 mph at highest peaks. Downsloping effects will produce gusty conditions on the lee side of mountains and foothills. * WHERE...North Bay Mountains and East Bay Hills and the Diablo Range. * WHEN...From 10 AM Wednesday to 4 AM PST Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ510-242230- /O.CON.KMTR.WI.Y.0004.210224T1800Z-210225T0600Z/ East Bay Interior Valleys- Including the cities of Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, and San Ramon 630 AM PST Wed Feb 24 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 10 PM PST THIS EVENING... * WHAT...North winds 10 to 20 mph with gusts 35 to 45 mph expected. * WHERE...East Bay Interior Valleys. * WHEN...From 10 AM to 10 PM PST Wednesday. * 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. && $$ CAZ512-242230- /O.CON.KMTR.WI.Y.0004.210224T1800Z-210225T1200Z/ Santa Cruz Mountains- Including the cities of Scotts Valley, Boulder Creek, and Day Valley 630 AM PST Wed Feb 24 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 4 AM PST THURSDAY... * WHAT...North winds 15 to 25 mph with gusts 35 to 45 mph expected. * WHERE...Santa Cruz Mountains. * WHEN...From 10 AM PST Wednesday TO 4 AM PST Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
057 WWUS76 KMTR 242201 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 201 PM PST Wed Feb 24 2021 CAZ507-511-250600- /O.CON.KMTR.WI.Y.0004.000000T0000Z-210225T1200Z/ North Bay Mountains-East Bay Hills and the Diablo Range- Including the cities of Angwin, Lagunitas-Forest Knolls, Woodacre, and Blackhawk 201 PM PST Wed Feb 24 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST THURSDAY... * WHAT...North winds 15 to 30 mph with gusts 45 to 55 mph, locally up to 70 mph at highest peaks. Downsloping effects will produce gusty conditions on the lee side of mountains and foothills. * WHERE...North Bay Mountains and East Bay Hills and the Diablo Range. * WHEN...Until 4 AM PST Thursday. * 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. && $$ CAZ510-250600- /O.CON.KMTR.WI.Y.0004.000000T0000Z-210225T0600Z/ East Bay Interior Valleys- Including the cities of Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, and San Ramon 201 PM PST Wed Feb 24 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING... * WHAT...North winds 10 to 20 mph with gusts 35 to 45 mph expected. * WHERE...East Bay Interior Valleys. * WHEN...Until 10 PM PST this evening. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ512-250600- /O.CON.KMTR.WI.Y.0004.000000T0000Z-210225T1200Z/ Santa Cruz Mountains- Including the cities of Scotts Valley, Boulder Creek, and Day Valley 201 PM PST Wed Feb 24 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST THURSDAY... * WHAT...North winds 15 to 25 mph with gusts 35 to 45 mph expected. * WHERE...Santa Cruz Mountains. * WHEN...Until 4 AM PST Thursday. * 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. && $$ For more information from the National Weather Service visit http://weather.gov/mtr
160 WWUS76 KMTR 250536 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 936 PM PST Wed Feb 24 2021 CAZ510-250645- /O.EXP.KMTR.WI.Y.0004.000000T0000Z-210225T0600Z/ East Bay Interior Valleys- Including the cities of Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg, and San Ramon 936 PM PST Wed Feb 24 2021 ...WIND ADVISORY WILL EXPIRE AT 10 PM PST THIS EVENING... The stronger winds will ease for the lower elevations and valleys after 10 pm. $$ CAZ507-511-251200- /O.CON.KMTR.WI.Y.0004.000000T0000Z-210225T1200Z/ North Bay Mountains-East Bay Hills and the Diablo Range- Including the cities of Angwin, Lagunitas-Forest Knolls, Woodacre, and Blackhawk 936 PM PST Wed Feb 24 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST THURSDAY... * WHAT...North winds 15 to 30 mph with gusts 45 to 55 mph, locally up to 70 mph at highest peaks. Downsloping effects will produce gusty conditions on the lee side of mountains and foothills. * WHERE...North Bay Mountains and East Bay Hills and the Diablo Range. * WHEN...Until 4 AM PST Thursday. * 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. && $$ CAZ512-251200- /O.CON.KMTR.WI.Y.0004.000000T0000Z-210225T1200Z/ Santa Cruz Mountains- Including the cities of Scotts Valley, Boulder Creek, and Day Valley 936 PM PST Wed Feb 24 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST THURSDAY... * WHAT...North winds 15 to 25 mph with gusts 35 to 45 mph expected. * WHERE...Santa Cruz Mountains. * WHEN...Until 4 AM PST Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
273 WWUS76 KMTR 251155 NPWMTR URGENT - WEATHER MESSAGE National Weather Service San Francisco Bay Area 355 AM PST Thu Feb 25 2021 CAZ507-511-251300- /O.EXP.KMTR.WI.Y.0004.000000T0000Z-210225T1200Z/ North Bay Mountains-East Bay Hills and the Diablo Range- Including the cities of Angwin, Lagunitas-Forest Knolls, Woodacre, and Blackhawk 355 AM PST Thu Feb 25 2021 ...WIND ADVISORY WILL EXPIRE AT 4 AM PST EARLY THIS MORNING... Winds will continue to decrease through the early morning hours. Therefore, the wind advisory will be allowed to expire. Winds above 3,000 feet will remain gusty through this afternoon. $$ CAZ512-251300- /O.EXP.KMTR.WI.Y.0004.000000T0000Z-210225T1200Z/ Santa Cruz Mountains- Including the cities of Scotts Valley, Boulder Creek, and Day Valley 355 AM PST Thu Feb 25 2021 ...WIND ADVISORY WILL EXPIRE AT 4 AM PST EARLY THIS MORNING... Winds will continue to decrease through the early morning hours. Therefore, the wind advisory will be allowed to expire. Winds above 3,000 feet will remain gusty through this afternoon. $$ 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 |
|---|---|---|---|---|
| Feb 23, 3:01 AM PST | Small Craft Advisory | MTR | 48 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.