Alert archive / California / Wind Advisories in 2019
Wind Advisory 77, NWS Los Angeles, CA
NWS Los Angeles, CA issued this wind advisory at Oct 27, 2019, 12:26 PM PDT for Los Angeles County, California. It took effect at Oct 27, 2019, 10:00 PM PDT. It was in force for 16 hr.
The area
The counties it named.
The facts
- Issued
- Oct 27, 2019, 12:26 PM PDT (19:26 UTC)
- In effect from
- Oct 27, 2019, 10:00 PM PDT
- Expired
- Oct 28, 2019, 2:00 PM PDT
- In force
- 16 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 19:31 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 12:00Z, 7.4 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
- 1702 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 144 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
962 WWUS76 KLOX 271926 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 1226 PM PDT Sun Oct 27 2019 CAZ046-054-280330- /O.NEW.KLOX.HW.W.0011.191028T0500Z-191028T2100Z/ Santa Monica Mountains Recreational Area- Los Angeles County Mountains excluding the Santa Monica Range- Including the cities of Acton, Mount Wilson, and Sandberg 1226 PM PDT Sun Oct 27 2019 ...HIGH WIND WARNING IN EFFECT FROM 10 PM THIS EVENING TO 2 PM PDT MONDAY... * WHAT...Northeast winds 25 to 40 mph with gusts up to 60 mph expected. * WHERE...Santa Monica Mountains Recreational Area, especially the western portions, and Los Angeles County Mountains. * WHEN...From 10 PM this evening to 2 PM PDT Monday. * IMPACTS...Damaging winds will blow down trees and possibly power lines. Travel will be difficult, especially for high profile vehicles. Portions of Interstate 5 and Highway 14 will be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... People should avoid being outside in forested areas and around trees and branches. If possible, remain in the lower levels of your home during the windstorm, and avoid windows. Use caution if you must drive. && $$ CAZ059-280330- /O.CON.KLOX.FZ.W.0011.191028T0900Z-191028T1600Z/ Antelope Valley- Including the cities of Lancaster and Palmdale 1226 PM PDT Sun Oct 27 2019 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT MONDAY... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Antelope Valley. * WHEN...From 2 AM to 9 AM PDT Monday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...This replaces the Freeze Watch for Antelope Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ CAZ040-041-044-045-053-088-547-548-280330- /O.NEW.KLOX.WI.Y.0077.191028T0500Z-191028T2100Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- Ventura County Interior Valleys-Ventura County Coastal Valleys- Ventura County Mountains-Santa Clarita Valley- Los Angeles County San Fernando Valley- Los Angeles County San Gabriel Valley- Including the cities of Ventura, Oxnard, Camarillo, Malibu, Santa Monica, Beverly Hills, Hollywood, Long Beach, Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Lockwood Valley, Mount Pinos, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, Universal City, Pasadena, San Gabriel, and Pomona 1226 PM PDT Sun Oct 27 2019 ...WIND ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 2 PM PDT MONDAY... * WHAT...Northeast winds 20 to 30 mph with gusts 40 to 50 mph expected. * WHERE...Ventura County Coast, Los Angeles County Coast including Downtown Los Angeles, Ventura County Interior Valleys, Ventura County Coastal Valleys, Ventura County Mountains, Santa Clarita Valley, Los Angeles County San Fernando Valley and Los Angeles County San Gabriel Valley. * WHEN...From 10 PM this evening to 2 PM PDT Monday. * IMPACTS...Gusty winds will make driving difficult and could blow around unsecured objects. Portions of Highway 118 through Simi Valley will be affected. Tree limbs could be blown down. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ jld
5 follow-up statements
623 WWUS76 KLOX 280051 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 551 PM PDT Sun Oct 27 2019 CAZ059-280900- /O.CON.KLOX.FZ.W.0011.191028T0900Z-191028T1600Z/ Antelope Valley- Including the cities of Lancaster and Palmdale 551 PM PDT Sun Oct 27 2019 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT MONDAY... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Antelope Valley. * WHEN...From 2 AM to 9 AM PDT Monday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...This replaces the Freeze Watch for Antelope Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ CAZ046-054-280900- /O.CON.KLOX.HW.W.0011.191028T0500Z-191028T2100Z/ Santa Monica Mountains Recreational Area- Los Angeles County Mountains excluding the Santa Monica Range- Including the cities of Acton, Mount Wilson, and Sandberg 551 PM PDT Sun Oct 27 2019 ...HIGH WIND WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 2 PM PDT MONDAY... * WHAT...Northeast winds 25 to 40 mph with gusts up to 60 mph expected. * WHERE...Santa Monica Mountains Recreational Area, especially the western portions, and Los Angeles County Mountains. * WHEN...From 10 PM this evening to 2 PM PDT Monday. * IMPACTS...Damaging winds will blow down trees and possibly power lines. Travel will be difficult, especially for high profile vehicles. Portions of Interstate 5 and Highway 14 will be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... People should avoid being outside in forested areas and around trees and branches. If possible, remain in the lower levels of your home during the windstorm, and avoid windows. Use caution if you must drive. && $$ CAZ040-041-044-045-053-088-547-548-280900- /O.CON.KLOX.WI.Y.0077.191028T0500Z-191028T2100Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- Ventura County Interior Valleys-Ventura County Coastal Valleys- Ventura County Mountains-Santa Clarita Valley- Los Angeles County San Fernando Valley- Los Angeles County San Gabriel Valley- Including the cities of Ventura, Oxnard, Camarillo, Malibu, Santa Monica, Beverly Hills, Hollywood, Long Beach, Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Lockwood Valley, Mount Pinos, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, Universal City, Pasadena, San Gabriel, and Pomona 551 PM PDT Sun Oct 27 2019 ...WIND ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 2 PM PDT MONDAY... * WHAT...Northeast winds 20 to 30 mph with gusts 40 to 50 mph expected. * WHERE...Ventura County Coast, Los Angeles County Coast including Downtown Los Angeles, Ventura County Interior Valleys, Ventura County Coastal Valleys, Ventura County Mountains, Santa Clarita Valley, Los Angeles County San Fernando Valley and Los Angeles County San Gabriel Valley. * WHEN...From 10 PM this evening to 2 PM PDT Monday. * IMPACTS...Gusty winds will make driving difficult and could blow around unsecured objects. Portions of Highway 118 through Simi Valley will be affected. Tree limbs could be blown down. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
038 WWUS76 KLOX 280709 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 1209 AM PDT Mon Oct 28 2019 CAZ059-281600- /O.CON.KLOX.FZ.W.0011.191028T0900Z-191028T1600Z/ Antelope Valley- Including the cities of Lancaster and Palmdale 1209 AM PDT Mon Oct 28 2019 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Antelope Valley. * WHEN...From 2 AM to 9 AM PDT. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ CAZ046-054-281600- /O.CON.KLOX.HW.W.0011.000000T0000Z-191028T2100Z/ Santa Monica Mountains Recreational Area- Los Angeles County Mountains excluding the Santa Monica Range- Including the cities of Acton, Mount Wilson, and Sandberg 1209 AM PDT Mon Oct 28 2019 ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 2 PM PDT THIS AFTERNOON... * WHAT...Northeast winds 25 to 40 mph with gusts up to 60 mph. * WHERE...Santa Monica Mountains Recreational Area, especially the western portions, and Los Angeles County Mountains. * WHEN...From now until 2 PM PDT today. * IMPACTS...Damaging winds will blow down trees and possibly power lines. Travel will be difficult, especially for high profile vehicles. Portions of Interstate 5 and Highway 14 will be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... People should avoid being outside in forested areas and around trees and branches. If possible, remain in the lower levels of your home during the windstorm, and avoid windows. Use caution if you must drive. && $$ CAZ040-041-044-045-053-088-547-548-281600- /O.CON.KLOX.WI.Y.0077.000000T0000Z-191028T2100Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- Ventura County Interior Valleys-Ventura County Coastal Valleys- Ventura County Mountains-Santa Clarita Valley- Los Angeles County San Fernando Valley- Los Angeles County San Gabriel Valley- Including the cities of Ventura, Oxnard, Camarillo, Malibu, Santa Monica, Beverly Hills, Hollywood, Long Beach, Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Lockwood Valley, Mount Pinos, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, Universal City, Pasadena, San Gabriel, and Pomona 1209 AM PDT Mon Oct 28 2019 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 2 PM PDT THIS AFTERNOON... * WHAT...Northeast winds 20 to 30 mph with gusts 40 to 50 mph. * WHERE...Ventura County Coast, Los Angeles County Coast including Downtown Los Angeles, Ventura County Interior Valleys, Ventura County Coastal Valleys, Ventura County Mountains, Santa Clarita Valley, Los Angeles County San Fernando Valley and Los Angeles County San Gabriel Valley. * WHEN...From now until 2 PM PDT today. * IMPACTS...Gusty winds will make driving difficult and could blow around unsecured objects. Portions of Highway 118 through Simi Valley will be affected. Tree limbs could be blown down. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ ASR
726 WWUS76 KLOX 281011 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 311 AM PDT Mon Oct 28 2019 CAZ059-281815- /O.NEW.KLOX.FZ.A.0008.191029T1100Z-191029T1600Z/ /O.CON.KLOX.FZ.W.0011.000000T0000Z-191028T1600Z/ Antelope Valley- Including the cities of Lancaster and Palmdale 311 AM PDT Mon Oct 28 2019 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... ...FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY MORNING... The National Weather Service in Los Angeles/Oxnard has issued a Freeze Watch, which is in effect from late tonight through Tuesday morning. * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Antelope Valley. * WHEN...From 2 AM to 9 AM PDT and likely again early Tuesday morning. * Impacts...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. A Freeze Watch means temperatures between 29 and 32 degrees or less will be possible for at least two consecutive hours. Protective measures to save outdoor plants may be needed. Vulnerable animals and pets should be kept indoors in a house or barn. && $$ CAZ046-054-281815- /O.CON.KLOX.HW.W.0011.000000T0000Z-191028T2100Z/ Santa Monica Mountains Recreational Area- Los Angeles County Mountains excluding the Santa Monica Range- Including the cities of Acton, Mount Wilson, and Sandberg 311 AM PDT Mon Oct 28 2019 ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 2 PM PDT THIS AFTERNOON... * WHAT...Northeast winds 25 to 40 mph with gusts up to 60 mph. * WHERE...Santa Monica Mountains Recreational Area, especially the western portions, and Los Angeles County Mountains. * WHEN...From now until 2 PM PDT today. * IMPACTS...Damaging winds will blow down trees and possibly power lines. Travel will be difficult, especially for high profile vehicles. Portions of Interstate 5 and Highway 14 will be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... People should avoid being outside in forested areas and around trees and branches. If possible, remain in the lower levels of your home during the windstorm, and avoid windows. Use caution if you must drive. && $$ CAZ040-041-044-045-053-088-547-548-281815- /O.CON.KLOX.WI.Y.0077.000000T0000Z-191028T2100Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- Ventura County Interior Valleys-Ventura County Coastal Valleys- Ventura County Mountains-Santa Clarita Valley- Los Angeles County San Fernando Valley- Los Angeles County San Gabriel Valley- Including the cities of Ventura, Oxnard, Camarillo, Malibu, Santa Monica, Beverly Hills, Hollywood, Long Beach, Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Lockwood Valley, Mount Pinos, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, Universal City, Pasadena, San Gabriel, and Pomona 311 AM PDT Mon Oct 28 2019 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 2 PM PDT THIS AFTERNOON... * WHAT...Northeast winds 20 to 30 mph with gusts 40 to 50 mph. * WHERE...Ventura County Coast, Los Angeles County Coast including Downtown Los Angeles, Ventura County Interior Valleys, Ventura County Coastal Valleys, Ventura County Mountains, Santa Clarita Valley, Los Angeles County San Fernando Valley and Los Angeles County San Gabriel Valley. * WHEN...From now until 2 PM PDT today. * IMPACTS...Gusty winds will make driving difficult and could blow around unsecured objects. Portions of Highway 118 through Simi Valley will be affected. Tree limbs could be blown down. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
139 WWUS76 KLOX 281634 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 934 AM PDT Mon Oct 28 2019 CAZ046-054-282100- /O.CON.KLOX.HW.W.0011.000000T0000Z-191028T2100Z/ Santa Monica Mountains Recreational Area- Los Angeles County Mountains excluding the Santa Monica Range- Including the cities of Acton, Mount Wilson, and Sandberg 934 AM PDT Mon Oct 28 2019 ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 2 PM PDT THIS AFTERNOON... * WHAT...Northeast winds 25 to 40 mph with gusts up to 60 mph. * WHERE...Santa Monica Mountains Recreational Area, especially the western portions, and Los Angeles County Mountains. * WHEN...From now until 2 PM PDT today. * IMPACTS...Damaging winds will blow down trees and possibly power lines. Travel will be difficult, especially for high profile vehicles. Portions of Interstate 5 and Highway 14 will be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... People should avoid being outside in forested areas and around trees and branches. If possible, remain in the lower levels of your home during the windstorm, and avoid windows. Use caution if you must drive. && $$ CAZ040-041-044-045-053-088-547-548-282100- /O.CON.KLOX.WI.Y.0077.000000T0000Z-191028T2100Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- Ventura County Interior Valleys-Ventura County Coastal Valleys- Ventura County Mountains-Santa Clarita Valley- Los Angeles County San Fernando Valley- Los Angeles County San Gabriel Valley- Including the cities of Ventura, Oxnard, Camarillo, Malibu, Santa Monica, Beverly Hills, Hollywood, Long Beach, Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Lockwood Valley, Mount Pinos, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, Universal City, Pasadena, San Gabriel, and Pomona 934 AM PDT Mon Oct 28 2019 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 2 PM PDT THIS AFTERNOON... * WHAT...Northeast winds 20 to 30 mph with gusts 40 to 50 mph. * WHERE...Ventura County Coast, Los Angeles County Coast including Downtown Los Angeles, Ventura County Interior Valleys, Ventura County Coastal Valleys, Ventura County Mountains, Santa Clarita Valley, Los Angeles County San Fernando Valley and Los Angeles County San Gabriel Valley. * WHEN...From now until 2 PM PDT today. * IMPACTS...Gusty winds will make driving difficult and could blow around unsecured objects. Portions of Highway 118 through Simi Valley will be affected. Tree limbs could be blown down. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ059-290045- /O.CON.KLOX.FZ.A.0008.191029T1100Z-191029T1600Z/ Antelope Valley- Including the cities of Lancaster and Palmdale 934 AM PDT Mon Oct 28 2019 ...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY MORNING... * WHAT...Sub-freezing temperatures 30 to 34 degrees possible. * WHERE...Antelope Valley. * WHEN...From 2 AM to 9 AM PDT early Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$
184 WWUS76 KLOX 282114 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 214 PM PDT Mon Oct 28 2019 CAZ046-054-291215- /O.EXP.KLOX.HW.W.0011.000000T0000Z-191028T2100Z/ /O.NEW.KLOX.HW.A.0005.191030T0600Z-191031T1900Z/ Santa Monica Mountains Recreational Area- Los Angeles County Mountains excluding the Santa Monica Range- Including the cities of Acton, Mount Wilson, and Sandberg 214 PM PDT Mon Oct 28 2019 ...HIGH WIND WATCH IN EFFECT FROM TUESDAY EVENING THROUGH THURSDAY MORNING... * WHAT...Northeast winds 30 to 50 mph with gusts to 70 mph possible. Isolated gusts around 80 mph Wednesday. * WHERE...Los Angeles County Mountains including the western Santa Monica Range. * WHEN...From late Tuesday evening through Thursday morning. Strongest on Wednesday. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts and warnings for updates on this situation. Fasten loose objects or shelter objects in a safe location prior to the onset of winds. && $$ CAZ044-045-053-088-291215- /O.EXP.KLOX.WI.Y.0077.000000T0000Z-191028T2100Z/ /O.NEW.KLOX.HW.A.0005.191030T0600Z-191031T1900Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Ventura County Mountains-Santa Clarita Valley- Including the cities of Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Lockwood Valley, Mount Pinos, Santa Clarita, Newhall, and Valencia 214 PM PDT Mon Oct 28 2019 ...HIGH WIND WATCH IN EFFECT FROM TUESDAY EVENING THROUGH THURSDAY MORNING... * WHAT...Northeast winds 25 to 40 mph with gusts to 65 mph possible. Isolated gusts to 75 mph in the hills possible Wednesday. * WHERE...Ventura County Valleys and Mountains and the Santa Clarita Valley. * WHEN...From late Tuesday evening through Thursday morning. Strongest Wednesday. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts and warnings for updates on this situation. Fasten loose objects or shelter objects in a safe location prior to the onset of winds. && $$ CAZ040-547-291215- /O.EXP.KLOX.WI.Y.0077.000000T0000Z-191028T2100Z/ /O.NEW.KLOX.HW.A.0005.191030T0600Z-191031T1900Z/ Ventura County Coast-Los Angeles County San Fernando Valley- Including the cities of Ventura, Oxnard, Camarillo, Woodland Hills, Northridge, Burbank, and Universal City 214 PM PDT Mon Oct 28 2019 ...HIGH WIND WATCH IN EFFECT FROM TUESDAY EVENING THROUGH THURSDAY MORNING... * WHAT...Northeast winds 25 to 40 mph with gusts to 60 mph possible. * WHERE...Ventura County Coast and West San Fernando Valley. * WHEN...From late Tuesday evening through Thursday morning. Strongest on Wednesday. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts and warnings for updates on this situation. Fasten loose objects or shelter objects in a safe location prior to the onset of winds. && $$ CAZ041-548-282215- /O.EXP.KLOX.WI.Y.0077.000000T0000Z-191028T2100Z/ Los Angeles County Coast including Downtown Los Angeles- Los Angeles County San Gabriel Valley- Including the cities of Malibu, Santa Monica, Beverly Hills, Hollywood, Long Beach, Pasadena, San Gabriel, and Pomona 214 PM PDT Mon Oct 28 2019 ...WIND ADVISORY WILL EXPIRE AT 2 PM PDT THIS AFTERNOON... Winds have weakened below advisory levels, and will continue to weaken through the rest of the afternoon. $$ CAZ059-291215- /O.UPG.KLOX.FZ.A.0008.191029T1100Z-191029T1600Z/ /O.NEW.KLOX.FR.Y.0012.191029T0900Z-191029T1600Z/ /O.NEW.KLOX.HZ.A.0002.191030T0800Z-191101T1700Z/ Antelope Valley- Including the cities of Lancaster and Palmdale 214 PM PDT Mon Oct 28 2019 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... ...HARD FREEZE WATCH IN EFFECT FROM EARLY WEDNESDAY MORNING THROUGH FRIDAY MORNING... * WHAT...For the Frost Advisory, temperatures as low as 32 will result in frost formation. For the Hard Freeze Watch, sub- freezing temperatures as low as 18 possible. * WHERE...Antelope Valley. * WHEN...For the Frost Advisory, from 2 AM to 9 AM PDT Tuesday. For the Hard Freeze Watch, morning hours from early Wednesday through Friday. Coldest Thursday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ CAZ037-291215- /O.NEW.KLOX.FR.Y.0012.191029T0900Z-191029T1600Z/ /O.NEW.KLOX.FZ.A.0009.191030T0800Z-191101T1700Z/ San Luis Obispo County Interior Valleys- Including the cities of Paso Robles and Atascadero 214 PM PDT Mon Oct 28 2019 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... ...FREEZE WATCH IN EFFECT FROM EARLY WEDNESDAY MORNING THROUGH FRIDAY MORNING... * WHAT...For the Frost Advisory, temperatures as low as 32 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 26 possible. * WHERE...San Luis Obispo County Interior Valleys. * WHEN...For the Frost Advisory, from 2 AM to 9 AM PDT Tuesday. For the Freeze Watch, morning hours from early Wednesday through Friday. Coldest Thursday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ Kittell
What forecasters said that day
The local office's own words before this wind advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Los Angeles, CA wrote its last area forecast discussion before this wind advisory went out at Oct 27, 10:05 AM PDT, 2 hours 21 minutes earlier.
Area forecast discussion, Oct 27, 10:05 AM PDT, 2 hours 21 minutes before
Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
1005 AM PDT Sun Oct 27 2019
.SYNOPSIS...27/823 AM.
A low pressure will drop into the Great Basin bringing much
cooler temperatures and the return of low clouds today. A
moderate to locally strong Santa Ana wind event is likely tonight
through Monday, then another potentially stronger event is likely
Wednesday through Thursday. Temperatures will remain cool through
the week.
&&
.SHORT TERM (TDY-TUE)...27/910 AM.
***UPDATE***
Low clouds moved all the way in to San Fernando Valley this
morning in the eddy-forced marine layer. Clouds are still pretty
solid along the Central Coast as well. Not expecting clearing to
the coast until late afternoon in most places. The cooling
discussed in previous AFDs with coasts about 5 degrees cooler and
inland locations up to 15-20 degrees cooler than yesterday. An
exception is in Antelope Valley where wind has provided some
mixing and its actually a bit warmer than yesterday. No
significant changes expected from the earlier forecast.
***From Previous Discussion***
In quite the change of pace there is an eddy and a 1500 ft deep
marine layer. The eddy is centered 60 miles west of where it
usually forms and this has pulled the low clouds further west than
usual. Although it is not a sure bet feel that the low clouds
will spin up and over most of the coasts as well as some of the
lower vlys. The eddy continues to spin through the afternoon and
this will keep the low clouds over the beaches making it seem much
more June like than late October. Hgts will be falling through
the day as a cold trof moves in from the north. YDY's afternoon
582 DM hgts will give way to today's 570 DM hgts (564 DM in the
Antelope Vly) The marine layer and the falling hgts will combine
to bring 15 to 20 degrees of cooling to the area. Almost all max
temps across the coasts and vlys will be in the lower to mid 70s
or 4 to 8 degrees blo normal.
All eyes on tonight as a cold Santa Ana will develop. The trof
axis will move through the area in the early evening. (quick note:
there is a grip of PVA along the trof axis and the EC has
consistently developed rain over LA county with the trof passage.
It is the only mdl that has rain. Feel that the air mass which has
no moisture tap and originated from the dry interior simply will
not have enough moisture to produce rain) Cold air will spill into
the area and NNE upper level support will develop. The KDAG grad
is forecast to go from zero late this afternoon to -4 MB in the
late evening to -7MB by 5AM. Strong advisory level winds (gusts 45
to 55 mph) will develop across the usual Santa Ana wind swath NE
of the Santa Clarita Vly - Through the Santa Clarita and most of
the San Fernando Vly and out through southern VTA county and the
Santa Monica's and Malibu strip. There will be isolated gusts to
60 mph in the LA mtns and the windiest locations in the VTA vlys
near the LA county line. Whatever is left of the marine layer will
be blown out to sea. All of the cold air will move into the
Antelope Vly and in the areas that have light winds will see min
temps in the upper 20s. A freeze watch is in effect for the area
tonight.
The cold Santa Ana will continue Monday morning. The strong winds
and attendant low humidities will create a dangerous fire weather
environment. The event will not be long lived however as onshore
trends will significantly weaken the winds in the afternoon. Most
of the advisory level gusts will end by noon. All of the cold air
advection will drop the interior temps by 5 to 10 degrees
(The Antelope vly will struggle to even reach the mid 60s or 10
degrees blo normal) while the coasts and vlys will see 3 to 6
degrees of warming due to compressional heating and lack of marine
layer.
A quick return to onshore flow Monday night will likely yield some
marine layer stratus over the LA county coast and the Central
Coast. The cold dry airmass and clear skies will allow min temps
to dep into the mid and upper 20s across some inland locations esp
in the Antelope Vly.
.LONG TERM (WED-SAT)...27/405 AM.
Not much to talk about for Tuesday. Onshore flow will bring some
morning stratus, otherwise skies will be clear. Hgts will be
about 574 DM or about 5 DM blo normal. The lack of offshore flow
will lower coastal and vly temps by 4 to 8 degrees while the lack
of cold air advection will bring 3 to 6 degrees of warming to the
Antelope Vly.
There will be another cold Santa Ana on Wednesday. Another cold
trof will rotate out of Idaho and down through Nevada Tuesday
night. The cold air advection and upper support will start late
in the evening. The KDAG grad shoots from -3 MB at 11pm to -9 MB
at 5am. Advisory level winds will likely develop around midnight
and increase to strong advisory levels with isolated warning
level gusts after sunrise. This event looks like it could bring
strong winds to Avalon Harbor. There will be the typical
temperature pattern will cooling in the interior and warming
across the coasts and vlys. The Antelope Vly will not see any 60
degree readings only upper 50s. Despite the adiabatic warming the
coasts and vlys will only have max temps in the 70s. This will be
a multi day event and while there will be some drop off in the
afternoon the winds will continue through the afternoon and into
the night,
There will be another round of freezing temps in across the wind
sheltered interior.
Thurday will be windy but not as strong as Wednesday. Advisory
level gusts will again peak in the mid morning (but 5 to 10 mph
weaker than on Wednesday) and will continue into the early
afternoon before subsiding. There will be 4 to 8 degrees of
warming everywhere due to the cold air advection shutting off.
Halloween evening looks good weather wise. Clear skies and no
significant winds at all. Later on though, interior areas may see
another night of freezing conditions.
Dry NW 580 DM flow will make Friday and Saturday pleasant days.
Weak offshore flow will keep the stratus from developing and will
warm most max temps up to near normal. Overnight lows will
continue to be blo normal in the interior.
&&
.AVIATION...27/1705Z.
At 1645Z, the marine inversion at KLAX was based at 3000 feet.
The top of the inversion was 5800 feet with a temperature of
16 degrees Celsius.
Overall, moderate to high confidence in 18Z TAF package. SCT-
BKN025-035 deck will impact coastal/valley sites through 22Z,
before dissipating. For tonight, CAVU conditions expected as
offshore winds develop. Overnight, there is a chance of light to
moderate LLWS/turbulence across the valleys and mountain passes.
KLAX...Overall, moderate confidence in 18Z TAF. Current MVFR CIGs
could dissipate as late as 22Z. For tonight, CAVU conditions are
expected. There is a 50% chance of an easterly wind component
great than 8 knots 10Z-20Z.
KBUR...Moderate to high confidence in 18Z TAF. Current MVFR CIGs
could dissipate +/- 2 hours of current 21Z forecast. For tonight,
CAVU conditions are expected. Developing offshore winds could
generate light LLWS/turbulence after 12Z.
&&
.MARINE...27/905 AM.
For the Outer Waters, high confidence in current forecast. There
is a 70% chance of SCA level northeast winds across PZZ676 late
tonight and Monday morning. Otherwise, winds and seas are
expected to remain below Small Craft Advisory (SCA) levels today
through Thursday.
For the Inner Waters north of Point Sal, high confidence in
current forecast. Winds and seas are expected to remain below SCA
levels today through Thursday.
For the Inner Waters south of Point Conception, high confidence in
current forecast. An eddy circulation will result in southeast
winds gusting 10-15 knots this morning. SCA level northeast winds
will develop late this evening and continue through Monday
morning from Ventura to Malibu (and out to the Channel Islands) as
well as south of the Palos Verdes Peninsula. There is a 40%
chance that these SCA level winds could continue into early Monday
afternoon. From Monday night through Tuesday night, winds and
seas will be below SCA levels. However on Wednesday and Thursday,
SCA level northeast winds are likely again.
&&
.FIRE WEATHER...27/935 AM.
Onshore flow and an eddy circulation have brought a deepening marine layer
with low clouds across portions of the coasts and valleys this morning.
This will result in a cooling trend across the region today with higher
humidities. Meanwhile, there will be gusty onshore winds with continued
low humidities across the mountains and Antelope Valley that will bring
elevated to brief critical fire weather conditions to those areas today.
Our next Santa Ana wind event is expected to develop this evening
through Monday. The peak winds are expected to be tonight through Monday
morning when gusts between 40 and 50 mph will be common across wind
prone areas of Los Angeles and Ventura counties, except gusts between
50 and 60 mph across the Los Angeles county mountains (including the
Santa Monicas). There is increasing confidence that the LAX- Daggett
gradient will peak to at least -7 mb on Monday morning (with a
large 24 hour pressure change), along with a good surge of cold
air advection. Humidities are expected to lower rapidly tonight,
with minimum values between 5 and 10 percent in many areas on
Monday. Due to the combination of gusty winds, very low
humidities, and dry fuels a Red Flag Warning is in effect for much
of Los Angeles and Ventura counties tonight into Monday, with a
delay of critical conditions reaching coastal areas and the Santa
Monica mountains by late evening or overnight hours. Very rapid
fire spread, long range spotting, and extreme fire behavior will
be possible with any new fire ignitions.
There is also increasing confidence of a strong Santa Ana wind event
late Tuesday night into Thursday. The peak of the event is
expected to be Wednesday when damaging wind gusts between 50 and
70 mph will be possible for the wind prone areas of Los Angeles
and Ventura counties. The peak LAX-Daggett gradient with this stronger
event is expected to be between -8 and -9 mb, along with stronger
cold air advection. While it is still early, this Santa Ana wind
event has the potential to be the strongest we have seen so far
this season. These strong winds combined with a long duration of
single digit humidities will bring a strong potential for
widespread critical fire weather conditions across Los Angeles and
Ventura counties, with elevated to brief critical fire weather
conditions across San Luis Obispo and Santa Barbara counties. Fire
Weather Watches will need to be considered as early as this
afternoon for this second Santa Ana event.
&&
.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Freeze Watch in effect from late tonight through Monday
morning for zone 59. (See LAXNPWLOX).
Red Flag Warning in effect from 10 PM this evening to 6 PM
PDT Monday for zones 240-241-246-548. (See LAXRFWLOX).
Red Flag Warning in effect from 6 PM this evening to 6 PM PDT
Monday for zones 244-245-253-254-288-547. (See LAXRFWLOX).
PZ...Small Craft Advisory in effect from 9 PM this evening to noon
PDT Monday for zones 650-655. (See LAXMWWLOX).
&&
.HAZARD POTENTIAL OUTLOOK (TUE-SAT).
Moderate to strong Santa Ana winds are expected Monday and again
Wednesday and Thursday. These event pose a risk for dangerous fire
weather conditions along with downed trees and powerlines.
&&
PUBLIC...Rorke/jld
AVIATION...RAT
MARINE...RAT
FIRE...Gomberg
SYNOPSIS...Sweet
weather.gov/losangelesThe office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 27, 2:26 AM PDT | Small Craft Advisory | LOX | 35 hr | |
| Oct 27, 12:06 PM PDT | Freeze Warning | LOX | 21 hr | |
| Oct 27, 12:26 PM PDT | High Wind Warning | LOX | 26 hr | |
| Oct 27, 1:55 PM PDT | Fire Weather Watch | LOX | Los Angeles | 23 hr |
Nearby
Wind Advisories in California, 2019Every wind advisory in 2019
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.