Alert archive / California / Wind Advisories in 2021
Wind Advisory 49, NWS Los Angeles, CA
NWS Los Angeles, CA issued this wind advisory at Apr 17, 2021, 7:26 PM PDT for Los Angeles County, California. It took effect at Apr 18, 2021, 5:00 AM PDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Apr 17, 2021, 7:26 PM PDT (02:26 UTC)
- In effect from
- Apr 18, 2021, 5:00 AM PDT
- Expired
- Apr 18, 2021, 2:00 PM PDT
- In force
- 9 hr
- Issued by
- NWS Los Angeles, CA
County Los Angeles County, CA
The radar
The Santa Ana Mts radar (KSOX), 71 km from the middle of the area, began a volume at 02:27 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
San Diego, CA (KNKX), launched 00:00Z, 2.4 hours before the alert went out and 184 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
- 1622 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- -91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
346 WWUS76 KLOX 180226 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 726 PM PDT Sat Apr 17 2021 CAZ046-054-181200- /O.NEW.KLOX.WI.Y.0049.210418T1200Z-210418T2100Z/ Santa Monica Mountains Recreational Area- Los Angeles County Mountains excluding the Santa Monica Range- Including the cities of Acton, Mount Wilson, and Sandberg 726 PM PDT Sat Apr 17 2021 ...WIND ADVISORY IN EFFECT FROM 5 AM TO 2 PM PDT SUNDAY... * WHAT...Northeast winds 15 to 30 mph with gusts up to 45 mph expected. * WHERE...Santa Monica Mountains and Los Angeles County Mountains excluding the Santa Monica Range. * WHEN...From 5 AM to 2 PM PDT Sunday. * IMPACTS...Gusty winds will blow around unsecured objects and make driving difficult, especially for high profile vehicles. Tree limbs could be blown down and a few power outages may result. Major roadways that could be impacted by the gusty winds include Interstate 5 as well as Highways 14 and 39. The gusty Santa Ana winds combined with very warm temperatures and very low humidities will bring elevated fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ044-045-088-547-181200- /O.NEW.KLOX.WI.Y.0049.210418T1200Z-210418T2100Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Clarita Valley-Los Angeles County San Fernando Valley- Including the cities of Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, and Universal City 726 PM PDT Sat Apr 17 2021 ...WIND ADVISORY IN EFFECT FROM 5 AM TO 2 PM PDT SUNDAY... * WHAT...Northeast winds 15 to 25 mph with gusts 35 to 40 mph expected. Isolated gusts up to 45 mph likely in the windiest foothill locations. * WHERE...Ventura County Interior Valleys, Ventura County Coastal Valleys, Santa Clarita Valley and San Fernando Valley. * WHEN...From 5 AM to 2 PM PDT Sunday. * IMPACTS...Gusty winds will blow around unsecured objects and make driving difficult, especially for high profile vehicles. Tree limbs could be blown down and a few power outages may result. Major roadways that could be impacted by the gusty winds include Interstates 5 and 405, as well as Highways 14,23, and 118. The gusty Santa Ana winds combined with very warm temperatures and very low humidities will bring elevated fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ Gomberg
2 follow-up statements
777 WWUS76 KLOX 181201 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 501 AM PDT Sun Apr 18 2021 CAZ046-054-182100- /O.CON.KLOX.WI.Y.0049.000000T0000Z-210418T2100Z/ Santa Monica Mountains Recreational Area- Los Angeles County Mountains excluding the Santa Monica Range- Including the cities of Acton, Mount Wilson, and Sandberg 501 AM PDT Sun Apr 18 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 2 PM PDT THIS AFTERNOON... * WHAT...Northeast winds 15 to 30 mph with gusts up to 45 mph expected. * WHERE...Santa Monica Mountains and Los Angeles County Mountains excluding the Santa Monica Range. * WHEN...Until 2 PM PDT this afternoon. * IMPACTS...Gusty winds will blow around unsecured objects and make driving difficult, especially for high profile vehicles. Tree limbs could be blown down and a few power outages may result. Major roadways that could be impacted by the gusty winds include Interstate 5 as well as Highways 14 and 39. The gusty Santa Ana winds combined with very warm temperatures and very low humidities will bring elevated fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ044-045-088-547-182100- /O.CON.KLOX.WI.Y.0049.000000T0000Z-210418T2100Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Clarita Valley-Los Angeles County San Fernando Valley- Including the cities of Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, and Universal City 501 AM PDT Sun Apr 18 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 2 PM PDT THIS AFTERNOON... * WHAT...Northeast winds 15 to 25 mph with gusts 35 to 40 mph expected. Isolated gusts up to 45 mph likely in the windiest foothill locations. * WHERE...Ventura County Interior Valleys, Ventura County Coastal Valleys, Santa Clarita Valley and San Fernando Valley. * WHEN...Until 2 PM PDT this afternoon. * IMPACTS...Gusty winds will blow around unsecured objects and make driving difficult, especially for high profile vehicles. Tree limbs could be blown down and a few power outages may result. Major roadways that could be impacted by the gusty winds include Interstates 5 and 405, as well as Highways 14,23, and 118. The gusty Santa Ana winds combined with very warm temperatures and very low humidities will bring elevated fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ Rorke
567 WWUS76 KLOX 182116 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 216 PM PDT Sun Apr 18 2021 CAZ044>046-054-088-547-182230- /O.EXP.KLOX.WI.Y.0049.000000T0000Z-210418T2100Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Monica Mountains Recreational Area- Los Angeles County Mountains excluding the Santa Monica Range- Santa Clarita Valley-Los Angeles County San Fernando Valley- Including the cities of Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Acton, Mount Wilson, Sandberg, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, and Universal City 216 PM PDT Sun Apr 18 2021 ...WIND ADVISORY HAS EXPIRED... Winds have diminished across the area and the Wind Advisory was allowed to expire at 2 PM PDT. However, breezy to windy conditions with local gusts up to 40 to 50 mph will prevail thru mid afternoon. $$ Sirard
The office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 2:25 AM PDT | Small Craft Advisory | LOX | 25 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.