944 FNUS86 KLOX 282244 FWLLOX ECCDA Discussions National Weather Service Los Angeles/Oxnard CA 344 PM PDT Tue Jul 28 2020 ECC029-291645- Los Padres National Forest- Discussion for Vandenberg ECC Dispatch 344 PM PDT Tue Jul 28 2020 ...Discussion from Los Angeles/Oxnard... ...ELEVATED FIRE WEATHER CONDITIONS THROUGH THURSDAY FOR THE INTERIOR VALLEYS, MOUNTAINS, AND DESERTS DUE TO BREEZY AND VERY WARM AND DRY CONDITIONS... ...ELEVATED TO BRIEF CRITICAL FIRE WEATHER CONDITIONS FRIDAY AND SATURDAY ACROSS VALLEYS, FOOTHILLS, MOUNTAINS, AND DESERTS DUE TO HOT TEMPERATURES, VERY LOW HUMIDITIES, AND LOCALLY BREEZY CONDITIONS... High pressure will build over the area through the week, leading to an extended period of above normal temperatures as well as dry conditions across interior sections. Temperatures will gradually warm each day and peak on Friday when high temperatures of 95 to 105 are likely away from the coast. Minimum humidities in the teens and single digits are expected over interior areas through the forecast. The driest air each day will remain focused across the Antelope Valley and Los Angeles County mountains, however by Thursday the area of afternoon humidities in the teens will expand over most interior areas. Onshore wind gusts between 20 and 35 mph will continue each afternoon and evening over the interior and strongest in the Antelope Valley and adjacent foothills. Isolated gusts to 40 mph are possible in some areas of the Antelope Valley foothills such as around Lake Palmdale and through the highway 14 corridor. The combination of warm and dry conditions with onshore breezes will create elevated fire concerns for the interior valleys, mountains, and deserts through Thursday. Although the onshore pressure gradients weaken some by Friday to bring a bit lighter onshore breeze, increasing temperatures and further afternoon drying will expand the elevated fire concerns through interior sections on Friday and Saturday, and even with some brief critical fire conditions possible in the breezier locations. The areas of greatest concern will still be focused around the Los Angeles and Ventura County mountains and foothills and the Antelope Valley. In addition to the hot and dry afternoons, there will be poor overnight humidity recoveries in these areas. Locally breezy north to northwest winds are also forecast on Thursday and Friday through the Interstate 5 corridor and western portions of southern Santa Barbara County, where gusts of around 45 mph are possible. These northerly winds will also enhance the warming of the downstream valleys such as through the interior valleys of Los Angeles County. With such hot, unstable, and dry conditions expected for Friday and Saturday also comes deep mixing heights, which will create an environment conducive to vertical plume development given any new fire ignitions. The upper level high will start to weaken on Sunday to bring a cooling trend that continues into next week. ...Discussion from Monterey... Other than slight warming late in the week and into the weekend, very little change is anticipated over the next five days. A marine layer with a depth between 1500 and 2000 feet will persist, as will light to moderate onshore flow. These factors will maintain good overnight humidity recoveries in the valleys and along the lower slopes. However, rather poor overnight humidity recoveries will continue in the higher hills above the marine layer. $$ ECC028-291645- Santa Barbara County excluding Los Padres National Forest- Discussion for Santa Barbara ECC Dispatch 344 PM PDT Tue Jul 28 2020 ...ELEVATED FIRE WEATHER CONDITIONS THROUGH THURSDAY FOR THE INTERIOR VALLEYS, MOUNTAINS, AND DESERTS DUE TO BREEZY AND VERY WARM AND DRY CONDITIONS... ...ELEVATED TO BRIEF CRITICAL FIRE WEATHER CONDITIONS FRIDAY AND SATURDAY ACROSS VALLEYS, FOOTHILLS, MOUNTAINS, AND DESERTS DUE TO HOT TEMPERATURES, VERY LOW HUMIDITIES, AND LOCALLY BREEZY CONDITIONS... High pressure will build over the area through the week, leading to an extended period of above normal temperatures as well as dry conditions across interior sections. Temperatures will gradually warm each day and peak on Friday when high temperatures of 95 to 105 are likely away from the coast. Minimum humidities in the teens and single digits are expected over interior areas through the forecast. The driest air each day will remain focused across the Antelope Valley and Los Angeles County mountains, however by Thursday the area of afternoon humidities in the teens will expand over most interior areas. Onshore wind gusts between 20 and 35 mph will continue each afternoon and evening over the interior and strongest in the Antelope Valley and adjacent foothills. Isolated gusts to 40 mph are possible in some areas of the Antelope Valley foothills such as around Lake Palmdale and through the highway 14 corridor. The combination of warm and dry conditions with onshore breezes will create elevated fire concerns for the interior valleys, mountains, and deserts through Thursday. Although the onshore pressure gradients weaken some by Friday to bring a bit lighter onshore breeze, increasing temperatures and further afternoon drying will expand the elevated fire concerns through interior sections on Friday and Saturday, and even with some brief critical fire conditions possible in the breezier locations. The areas of greatest concern will still be focused around the Los Angeles and Ventura County mountains and foothills and the Antelope Valley. In addition to the hot and dry afternoons, there will be poor overnight humidity recoveries in these areas. Locally breezy north to northwest winds are also forecast on Thursday and Friday through the Interstate 5 corridor and western portions of southern Santa Barbara County, where gusts of around 45 mph are possible. These northerly winds will also enhance the warming of the downstream valleys such as through the interior valleys of Los Angeles County. With such hot, unstable, and dry conditions expected for Friday and Saturday also comes deep mixing heights, which will create an environment conducive to vertical plume development given any new fire ignitions. The upper level high will start to weaken on Sunday to bring a cooling trend that continues into next week. $$ ECC031-291645- Angeles National Forest- Discussion for Lancaster ECC Dispatch 344 PM PDT Tue Jul 28 2020 ...ELEVATED FIRE WEATHER CONDITIONS THROUGH THURSDAY FOR THE INTERIOR VALLEYS, MOUNTAINS, AND DESERTS DUE TO BREEZY AND VERY WARM AND DRY CONDITIONS... ...ELEVATED TO BRIEF CRITICAL FIRE WEATHER CONDITIONS FRIDAY AND SATURDAY ACROSS VALLEYS, FOOTHILLS, MOUNTAINS, AND DESERTS DUE TO HOT TEMPERATURES, VERY LOW HUMIDITIES, AND LOCALLY BREEZY CONDITIONS... High pressure will build over the area through the week, leading to an extended period of above normal temperatures as well as dry conditions across interior sections. Temperatures will gradually warm each day and peak on Friday when high temperatures of 95 to 105 are likely away from the coast. Minimum humidities in the teens and single digits are expected over interior areas through the forecast. The driest air each day will remain focused across the Antelope Valley and Los Angeles County mountains, however by Thursday the area of afternoon humidities in the teens will expand over most interior areas. Onshore wind gusts between 20 and 35 mph will continue each afternoon and evening over the interior and strongest in the Antelope Valley and adjacent foothills. Isolated gusts to 40 mph are possible in some areas of the Antelope Valley foothills such as around Lake Palmdale and through the highway 14 corridor. The combination of warm and dry conditions with onshore breezes will create elevated fire concerns for the interior valleys, mountains, and deserts through Thursday. Although the onshore pressure gradients weaken some by Friday to bring a bit lighter onshore breeze, increasing temperatures and further afternoon drying will expand the elevated fire concerns through interior sections on Friday and Saturday, and even with some brief critical fire conditions possible in the breezier locations. The areas of greatest concern will still be focused around the Los Angeles and Ventura County mountains and foothills and the Antelope Valley. In addition to the hot and dry afternoons, there will be poor overnight humidity recoveries in these areas. Locally breezy north to northwest winds are also forecast on Thursday and Friday through the Interstate 5 corridor and western portions of southern Santa Barbara County, where gusts of around 45 mph are possible. These northerly winds will also enhance the warming of the downstream valleys such as through the interior valleys of Los Angeles County. With such hot, unstable, and dry conditions expected for Friday and Saturday also comes deep mixing heights, which will create an environment conducive to vertical plume development given any new fire ignitions. The upper level high will start to weaken on Sunday to bring a cooling trend that continues into next week. $$ ECC024-291645- San Luis Obispo County- Discussion for San Luis Obispo ECC Dispatch 344 PM PDT Tue Jul 28 2020 ...ELEVATED FIRE WEATHER CONDITIONS THROUGH THURSDAY FOR THE INTERIOR VALLEYS, MOUNTAINS, AND DESERTS DUE TO BREEZY AND VERY WARM AND DRY CONDITIONS... ...ELEVATED TO BRIEF CRITICAL FIRE WEATHER CONDITIONS FRIDAY AND SATURDAY ACROSS VALLEYS, FOOTHILLS, MOUNTAINS, AND DESERTS DUE TO HOT TEMPERATURES, VERY LOW HUMIDITIES, AND LOCALLY BREEZY CONDITIONS... High pressure will build over the area through the week, leading to an extended period of above normal temperatures as well as dry conditions across interior sections. Temperatures will gradually warm each day and peak on Friday when high temperatures of 95 to 105 are likely away from the coast. Minimum humidities in the teens and single digits are expected over interior areas through the forecast. The driest air each day will remain focused across the Antelope Valley and Los Angeles County mountains, however by Thursday the area of afternoon humidities in the teens will expand over most interior areas. Onshore wind gusts between 20 and 35 mph will continue each afternoon and evening over the interior and strongest in the Antelope Valley and adjacent foothills. Isolated gusts to 40 mph are possible in some areas of the Antelope Valley foothills such as around Lake Palmdale and through the highway 14 corridor. The combination of warm and dry conditions with onshore breezes will create elevated fire concerns for the interior valleys, mountains, and deserts through Thursday. Although the onshore pressure gradients weaken some by Friday to bring a bit lighter onshore breeze, increasing temperatures and further afternoon drying will expand the elevated fire concerns through interior sections on Friday and Saturday, and even with some brief critical fire conditions possible in the breezier locations. The areas of greatest concern will still be focused around the Los Angeles and Ventura County mountains and foothills and the Antelope Valley. In addition to the hot and dry afternoons, there will be poor overnight humidity recoveries in these areas. Locally breezy north to northwest winds are also forecast on Thursday and Friday through the Interstate 5 corridor and western portions of southern Santa Barbara County, where gusts of around 45 mph are possible. These northerly winds will also enhance the warming of the downstream valleys such as through the interior valleys of Los Angeles County. With such hot, unstable, and dry conditions expected for Friday and Saturday also comes deep mixing heights, which will create an environment conducive to vertical plume development given any new fire ignitions. The upper level high will start to weaken on Sunday to bring a cooling trend that continues into next week. $$ ECC032-291645- Ventura County excluding Los Padres National Forest- Discussion for Ventura ECC Dispatch 344 PM PDT Tue Jul 28 2020 ...ELEVATED FIRE WEATHER CONDITIONS THROUGH THURSDAY FOR THE INTERIOR VALLEYS, MOUNTAINS, AND DESERTS DUE TO BREEZY AND VERY WARM AND DRY CONDITIONS... ...ELEVATED TO BRIEF CRITICAL FIRE WEATHER CONDITIONS FRIDAY AND SATURDAY ACROSS VALLEYS, FOOTHILLS, MOUNTAINS, AND DESERTS DUE TO HOT TEMPERATURES, VERY LOW HUMIDITIES, AND LOCALLY BREEZY CONDITIONS... High pressure will build over the area through the week, leading to an extended period of above normal temperatures as well as dry conditions across interior sections. Temperatures will gradually warm each day and peak on Friday when high temperatures of 95 to 105 are likely away from the coast. Minimum humidities in the teens and single digits are expected over interior areas through the forecast. The driest air each day will remain focused across the Antelope Valley and Los Angeles County mountains, however by Thursday the area of afternoon humidities in the teens will expand over most interior areas. Onshore wind gusts between 20 and 35 mph will continue each afternoon and evening over the interior and strongest in the Antelope Valley and adjacent foothills. Isolated gusts to 40 mph are possible in some areas of the Antelope Valley foothills such as around Lake Palmdale and through the highway 14 corridor. The combination of warm and dry conditions with onshore breezes will create elevated fire concerns for the interior valleys, mountains, and deserts through Thursday. Although the onshore pressure gradients weaken some by Friday to bring a bit lighter onshore breeze, increasing temperatures and further afternoon drying will expand the elevated fire concerns through interior sections on Friday and Saturday, and even with some brief critical fire conditions possible in the breezier locations. The areas of greatest concern will still be focused around the Los Angeles and Ventura County mountains and foothills and the Antelope Valley. In addition to the hot and dry afternoons, there will be poor overnight humidity recoveries in these areas. Locally breezy north to northwest winds are also forecast on Thursday and Friday through the Interstate 5 corridor and western portions of southern Santa Barbara County, where gusts of around 45 mph are possible. These northerly winds will also enhance the warming of the downstream valleys such as through the interior valleys of Los Angeles County. With such hot, unstable, and dry conditions expected for Friday and Saturday also comes deep mixing heights, which will create an environment conducive to vertical plume development given any new fire ignitions. The upper level high will start to weaken on Sunday to bring a cooling trend that continues into next week. $$ ECC030-291645- Los Angeles County excluding Angeles National Forest- Discussion for Los Angeles ECC Dispatch 344 PM PDT Tue Jul 28 2020 ...ELEVATED FIRE WEATHER CONDITIONS THROUGH THURSDAY FOR THE INTERIOR VALLEYS, MOUNTAINS, AND DESERTS DUE TO BREEZY AND VERY WARM AND DRY CONDITIONS... ...ELEVATED TO BRIEF CRITICAL FIRE WEATHER CONDITIONS FRIDAY AND SATURDAY ACROSS VALLEYS, FOOTHILLS, MOUNTAINS, AND DESERTS DUE TO HOT TEMPERATURES, VERY LOW HUMIDITIES, AND LOCALLY BREEZY CONDITIONS... High pressure will build over the area through the week, leading to an extended period of above normal temperatures as well as dry conditions across interior sections. Temperatures will gradually warm each day and peak on Friday when high temperatures of 95 to 105 are likely away from the coast. Minimum humidities in the teens and single digits are expected over interior areas through the forecast. The driest air each day will remain focused across the Antelope Valley and Los Angeles County mountains, however by Thursday the area of afternoon humidities in the teens will expand over most interior areas. Onshore wind gusts between 20 and 35 mph will continue each afternoon and evening over the interior and strongest in the Antelope Valley and adjacent foothills. Isolated gusts to 40 mph are possible in some areas of the Antelope Valley foothills such as around Lake Palmdale and through the highway 14 corridor. The combination of warm and dry conditions with onshore breezes will create elevated fire concerns for the interior valleys, mountains, and deserts through Thursday. Although the onshore pressure gradients weaken some by Friday to bring a bit lighter onshore breeze, increasing temperatures and further afternoon drying will expand the elevated fire concerns through interior sections on Friday and Saturday, and even with some brief critical fire conditions possible in the breezier locations. The areas of greatest concern will still be focused around the Los Angeles and Ventura County mountains and foothills and the Antelope Valley. In addition to the hot and dry afternoons, there will be poor overnight humidity recoveries in these areas. Locally breezy north to northwest winds are also forecast on Thursday and Friday through the Interstate 5 corridor and western portions of southern Santa Barbara County, where gusts of around 45 mph are possible. These northerly winds will also enhance the warming of the downstream valleys such as through the interior valleys of Los Angeles County. With such hot, unstable, and dry conditions expected for Friday and Saturday also comes deep mixing heights, which will create an environment conducive to vertical plume development given any new fire ignitions. The upper level high will start to weaken on Sunday to bring a cooling trend that continues into next week. $$ 15