####018005929#### FNUS86 KMTR 122157 FWLMTR ECCDA Discussions National Weather Service SAN FRANCISCO BAY AREA 257 PM PDT Thu Jun 12 2025 ##################################################################### ## ## ## Discussions from the latest FWF below ## ## ## ##################################################################### ...Discussion from SFOFWFMTR... Coastal nighttime stratus continues with patchy stratus extending along the San Francisco Bay Shoreline as the marine layer remaining steady around 2000 ft. Breezy to gusty onshore winds continue to develop each afternoon across elevated terrain, mountain gaps and passes, and along the coastline. Poor daytime humidity retention is expected across the North Bay Interior Mountains, East/South Bay Hills, and far interior Central Coast with only moderate to poor recoveries expected. Increased concern for grass fires exist for these regions through Friday. Conditions look to improve over the weekend into early next week as a weak shortwave trough approaches the coastline and increases onshore flow. ...Discussion from SFOFWFEKA... Gusty westerly-to-northwesterly breezes with minimum RH's around 15% to 25% are forecast to continue in the interior valleys of Lake, Mendocino and Trinity Counties through Friday. Otherwise, a cooling trend in the interior is expected to continue through Friday. Temperatures are forecast to rebound slightly over the weekend. Coastal areas will remain much cooler with much higher humidity. Locally strong northerlies with lower RH's are likely over the higher terrain of the King Range Friday and Saturday. ##################################################################### ## ## ## Complete a discussion for each ECCDA segment below ## ## When done click transmit, product sent as KMTRFWLMTR ## ## ## ##################################################################### ECC010-131000- St Helena ECC Dispatch- DISCUSSION FOR Marin and Sonoma and Napa Counties 257 PM PDT Thu Jun 12 2025 Coastal nighttime stratus continues with patchy stratus extending along the San Francisco Bay Shoreline as the marine layer remaining steady around 2000 ft. Breezy to gusty onshore winds continue to develop each afternoon across elevated terrain, mountain gaps and passes, and along the coastline. Poor daytime humidity retention between 30 to 40 percent is expected across the North Bay Interior Mountains with only moderate recoveries between 45 to 60 percent expected. Wind gusts will peak between 20 to 25 mph with increase concern for grass fires continuing through Friday. Conditions look to improve over the weekend into early next week as a weak shortwave trough approaches the coastline and increases onshore flow. $$ ECC014-131000- Morgan Hill ECC Dispatch- DISCUSSION FOR Alameda and Contra Costa and Santa Clara Counties 257 PM PDT Thu Jun 12 2025 Coastal nighttime stratus continues with patchy stratus extending along the San Francisco Bay Shoreline as the marine layer remaining steady around 2000 ft. Breezy to gusty onshore winds continue to develop each afternoon across elevated terrain, mountain gaps and passes, and along the coastline. Poor daytime humidity retention between 20 to 30 percent is expected across the East and South Bay Hills with gusty afternoon winds between 25 mph to 35 mph. The strongest winds will be across the East Bay Hills with locally stronger winds possible across areas where topographic funneling is favored (Altamont Pass region). This will result in increased concern for grass fires through Friday before conditions improve this weekend into early next week as a weak shortwave trough approaches and onshore flow increases. $$ ECC013-131000- Felton ECC Dispatch- DISCUSSION FOR Santa Cruz and San Mateo Counties 257 PM PDT Thu Jun 12 2025 Coastal nighttime stratus continues with patchy stratus extending along the San Francisco Bay Shoreline as the marine layer remaining steady around 2000 ft. Breezy to gusty onshore winds continue to develop each afternoon across elevated terrain, mountain gaps and passes, and along the coastline. Poor daytime humidity retention is expected across the North Bay Interior Mountains, East/South Bay Hills, and far interior Central Coast with only moderate to poor recoveries expected. Increased concern for grass fires exist for these regions through Friday. Conditions look to improve over the weekend into early next week as a weak shortwave trough approaches the coastline and increases onshore flow. $$ ECC018-131000- Monterey ECC Dispatch- DISCUSSION FOR Monterey and San Benito County 257 PM PDT Thu Jun 12 2025 Coastal nighttime stratus continues with patchy stratus extending along the San Francisco Bay Shoreline as the marine layer remaining steady around 2000 ft. Breezy to gusty onshore winds continue to develop each afternoon across elevated terrain, mountain gaps and passes, and along the coastline. Poor daytime humidity retention between 10 to 25 percent continues across the far interior Central Coast with poor overnight recoveries between 25 to 40% across the higher elevations. Winds remain lighter with gusty winds confined to the Salinas Valley and winds peaking closer to 15 mph across the interior Central Coast. Increased concern for grass fires continues as fuels continue to dry across the Central Coast. $$ ####018020962#### FNUS86 KLOX 122157 FWLLOX ECCDA Discussions National Weather Service Los Angeles/Oxnard CA 257 PM PDT Thu Jun 12 2025 ECC029-131600- Los Padres National Forest- Discussion for Vandenberg ECC Dispatch 257 PM PDT Thu Jun 12 2025 ...Discussion from Monterey... Coastal nighttime stratus continues with patchy stratus extending along the San Francisco Bay Shoreline as the marine layer remaining steady around 2000 ft. Breezy to gusty onshore winds continue to develop each afternoon across elevated terrain, mountain gaps and passes, and along the coastline. Poor daytime humidity retention is expected across the North Bay Interior Mountains, East/South Bay Hills, and far interior Central Coast with only moderate to poor recoveries expected. Increased concern for grass fires exist for these regions through Friday. Conditions look to improve over the weekend into early next week as a weak shortwave trough approaches the coastline and increases onshore flow. Note : All winds are 20-foot Winds Unless otherwise specified. Thunderstorms imply strong, gusty and erratic winds. ...Discussion from Los Angeles/Oxnard... ...ELEVATED TO BRIEF CRITICAL FIRE-WEATHER CONDITIONS ACROSS INTERIOR AREAS AND THE SOUTHWEST SANTA BARBARA COUNTY MOUNTAINS AND FOOTHILLS TODAY THROUGH EARLY NEXT WEEK DUE TO DRY CONDITIONS WITH WARM TO HOT TEMPERATURES AND GUSTY WINDS... Persistent thermal troughing over the southwest states will sustain -- through next week -- onshore flow over most areas, except for offshore flow over the southwest Santa Barbara County vicinity. Onshore flow and the accompanying marine layer will keep humidity high over the coasts and coastal valleys, aside from southwest Santa Barbara County vicinity. However, humidity values will quickly drop with inland extent away from the coast. Through next week, interior sections will experience minimum humidity from the teens to the 20s, with isolated locations in the single digits, and with moderate overnight humidity recovery. The area of low humidity will edge slightly toward the coast this weekend, as the marine layer becomes increasingly more shallow in response to ridging aloft. The gusty onshore winds across the interior areas beyond the edge of the marine layer -- wind directions generally from the west-southwest to northwest -- will combine with the low humidity to create elevated to brief critical fire-weather conditions through early next week. The areas of greatest concern for the heightened fire-weather potential will be across the Antelope Valley, the Antelope Valley Foothills, and the Interstate-5 corridor of northwest Los Angeles County. In addition, the gusty offshore winds over southwest Santa Barbara County, enhanced within Sundowner wind regimes, will also locally support the heightened fire-weather risk over the mountains and foothills. For areas experiencing the heightened fire-weather risk, 35-45-mph wind gusts are expected to combine with the low humidity occurring during the afternoon through the early overnight hours. However, for the southwest Santa Barbara County mountains and foothills, this wind and humidity combination will be delayed to some extent by Sundowner wind enhancements, when the greatest fire-weather risk will peak from the late afternoon into the overnight hours. Local gusts to 50 mph may also accompany the Sundowner wind regimes across the southwest Santa Barbara County mountains and foothills. Overall, the concern for heightened fire-weather conditions will mainly be restricted to grass fires, where fuel moistures will be driest. Also of note, in response to the ridging aloft and related retreating marine layer, very warm to hot conditions are forecast this weekend across interior areas, with highs in the 90s to the lower 100s. In the extended outlook -- covering the period from middle through latter parts of next week -- dry conditions will continue over the interior areas and southwest Santa Barbara County mountains and foothills. While weaker winds will limit the fire-weather risk to some extent, locally elevated fire-weather conditions will remain possible for middle to latter parts of next week. $$ ECC028-131600- Santa Barbara County excluding Los Padres National Forest- Discussion for Santa Barbara ECC Dispatch 257 PM PDT Thu Jun 12 2025 ...ELEVATED TO BRIEF CRITICAL FIRE-WEATHER CONDITIONS ACROSS INTERIOR AREAS AND THE SOUTHWEST SANTA BARBARA COUNTY MOUNTAINS AND FOOTHILLS TODAY THROUGH EARLY NEXT WEEK DUE TO DRY CONDITIONS WITH WARM TO HOT TEMPERATURES AND GUSTY WINDS... Persistent thermal troughing over the southwest states will sustain -- through next week -- onshore flow over most areas, except for offshore flow over the southwest Santa Barbara County vicinity. Onshore flow and the accompanying marine layer will keep humidity high over the coasts and coastal valleys, aside from southwest Santa Barbara County vicinity. However, humidity values will quickly drop with inland extent away from the coast. Through next week, interior sections will experience minimum humidity from the teens to the 20s, with isolated locations in the single digits, and with moderate overnight humidity recovery. The area of low humidity will edge slightly toward the coast this weekend, as the marine layer becomes increasingly more shallow in response to ridging aloft. The gusty onshore winds across the interior areas beyond the edge of the marine layer -- wind directions generally from the west-southwest to northwest -- will combine with the low humidity to create elevated to brief critical fire-weather conditions through early next week. The areas of greatest concern for the heightened fire-weather potential will be across the Antelope Valley, the Antelope Valley Foothills, and the Interstate-5 corridor of northwest Los Angeles County. In addition, the gusty offshore winds over southwest Santa Barbara County, enhanced within Sundowner wind regimes, will also locally support the heightened fire-weather risk over the mountains and foothills. For areas experiencing the heightened fire-weather risk, 35-45-mph wind gusts are expected to combine with the low humidity occurring during the afternoon through the early overnight hours. However, for the southwest Santa Barbara County mountains and foothills, this wind and humidity combination will be delayed to some extent by Sundowner wind enhancements, when the greatest fire-weather risk will peak from the late afternoon into the overnight hours. Local gusts to 50 mph may also accompany the Sundowner wind regimes across the southwest Santa Barbara County mountains and foothills. Overall, the concern for heightened fire-weather conditions will mainly be restricted to grass fires, where fuel moistures will be driest. Also of note, in response to the ridging aloft and related retreating marine layer, very warm to hot conditions are forecast this weekend across interior areas, with highs in the 90s to the lower 100s. In the extended outlook -- covering the period from middle through latter parts of next week -- dry conditions will continue over the interior areas and southwest Santa Barbara County mountains and foothills. While weaker winds will limit the fire-weather risk to some extent, locally elevated fire-weather conditions will remain possible for middle to latter parts of next week. $$ ECC031-131600- Angeles National Forest- Discussion for Lancaster ECC Dispatch 257 PM PDT Thu Jun 12 2025 ...ELEVATED TO BRIEF CRITICAL FIRE-WEATHER CONDITIONS ACROSS INTERIOR AREAS AND THE SOUTHWEST SANTA BARBARA COUNTY MOUNTAINS AND FOOTHILLS TODAY THROUGH EARLY NEXT WEEK DUE TO DRY CONDITIONS WITH WARM TO HOT TEMPERATURES AND GUSTY WINDS... Persistent thermal troughing over the southwest states will sustain -- through next week -- onshore flow over most areas, except for offshore flow over the southwest Santa Barbara County vicinity. Onshore flow and the accompanying marine layer will keep humidity high over the coasts and coastal valleys, aside from southwest Santa Barbara County vicinity. However, humidity values will quickly drop with inland extent away from the coast. Through next week, interior sections will experience minimum humidity from the teens to the 20s, with isolated locations in the single digits, and with moderate overnight humidity recovery. The area of low humidity will edge slightly toward the coast this weekend, as the marine layer becomes increasingly more shallow in response to ridging aloft. The gusty onshore winds across the interior areas beyond the edge of the marine layer -- wind directions generally from the west-southwest to northwest -- will combine with the low humidity to create elevated to brief critical fire-weather conditions through early next week. The areas of greatest concern for the heightened fire-weather potential will be across the Antelope Valley, the Antelope Valley Foothills, and the Interstate-5 corridor of northwest Los Angeles County. In addition, the gusty offshore winds over southwest Santa Barbara County, enhanced within Sundowner wind regimes, will also locally support the heightened fire-weather risk over the mountains and foothills. For areas experiencing the heightened fire-weather risk, 35-45-mph wind gusts are expected to combine with the low humidity occurring during the afternoon through the early overnight hours. However, for the southwest Santa Barbara County mountains and foothills, this wind and humidity combination will be delayed to some extent by Sundowner wind enhancements, when the greatest fire-weather risk will peak from the late afternoon into the overnight hours. Local gusts to 50 mph may also accompany the Sundowner wind regimes across the southwest Santa Barbara County mountains and foothills. Overall, the concern for heightened fire-weather conditions will mainly be restricted to grass fires, where fuel moistures will be driest. Also of note, in response to the ridging aloft and related retreating marine layer, very warm to hot conditions are forecast this weekend across interior areas, with highs in the 90s to the lower 100s. In the extended outlook -- covering the period from middle through latter parts of next week -- dry conditions will continue over the interior areas and southwest Santa Barbara County mountains and foothills. While weaker winds will limit the fire-weather risk to some extent, locally elevated fire-weather conditions will remain possible for middle to latter parts of next week. $$ ECC024-131600- San Luis Obispo County- Discussion for San Luis Obispo ECC Dispatch 257 PM PDT Thu Jun 12 2025 ...ELEVATED TO BRIEF CRITICAL FIRE-WEATHER CONDITIONS ACROSS INTERIOR AREAS AND THE SOUTHWEST SANTA BARBARA COUNTY MOUNTAINS AND FOOTHILLS TODAY THROUGH EARLY NEXT WEEK DUE TO DRY CONDITIONS WITH WARM TO HOT TEMPERATURES AND GUSTY WINDS... Persistent thermal troughing over the southwest states will sustain -- through next week -- onshore flow over most areas, except for offshore flow over the southwest Santa Barbara County vicinity. Onshore flow and the accompanying marine layer will keep humidity high over the coasts and coastal valleys, aside from southwest Santa Barbara County vicinity. However, humidity values will quickly drop with inland extent away from the coast. Through next week, interior sections will experience minimum humidity from the teens to the 20s, with isolated locations in the single digits, and with moderate overnight humidity recovery. The area of low humidity will edge slightly toward the coast this weekend, as the marine layer becomes increasingly more shallow in response to ridging aloft. The gusty onshore winds across the interior areas beyond the edge of the marine layer -- wind directions generally from the west-southwest to northwest -- will combine with the low humidity to create elevated to brief critical fire-weather conditions through early next week. The areas of greatest concern for the heightened fire-weather potential will be across the Antelope Valley, the Antelope Valley Foothills, and the Interstate-5 corridor of northwest Los Angeles County. In addition, the gusty offshore winds over southwest Santa Barbara County, enhanced within Sundowner wind regimes, will also locally support the heightened fire-weather risk over the mountains and foothills. For areas experiencing the heightened fire-weather risk, 35-45-mph wind gusts are expected to combine with the low humidity occurring during the afternoon through the early overnight hours. However, for the southwest Santa Barbara County mountains and foothills, this wind and humidity combination will be delayed to some extent by Sundowner wind enhancements, when the greatest fire-weather risk will peak from the late afternoon into the overnight hours. Local gusts to 50 mph may also accompany the Sundowner wind regimes across the southwest Santa Barbara County mountains and foothills. Overall, the concern for heightened fire-weather conditions will mainly be restricted to grass fires, where fuel moistures will be driest. Also of note, in response to the ridging aloft and related retreating marine layer, very warm to hot conditions are forecast this weekend across interior areas, with highs in the 90s to the lower 100s. In the extended outlook -- covering the period from middle through latter parts of next week -- dry conditions will continue over the interior areas and southwest Santa Barbara County mountains and foothills. While weaker winds will limit the fire-weather risk to some extent, locally elevated fire-weather conditions will remain possible for middle to latter parts of next week. $$ ECC032-131600- Ventura County excluding Los Padres National Forest- Discussion for Ventura ECC Dispatch 257 PM PDT Thu Jun 12 2025 ...ELEVATED TO BRIEF CRITICAL FIRE-WEATHER CONDITIONS ACROSS INTERIOR AREAS AND THE SOUTHWEST SANTA BARBARA COUNTY MOUNTAINS AND FOOTHILLS TODAY THROUGH EARLY NEXT WEEK DUE TO DRY CONDITIONS WITH WARM TO HOT TEMPERATURES AND GUSTY WINDS... Persistent thermal troughing over the southwest states will sustain -- through next week -- onshore flow over most areas, except for offshore flow over the southwest Santa Barbara County vicinity. Onshore flow and the accompanying marine layer will keep humidity high over the coasts and coastal valleys, aside from southwest Santa Barbara County vicinity. However, humidity values will quickly drop with inland extent away from the coast. Through next week, interior sections will experience minimum humidity from the teens to the 20s, with isolated locations in the single digits, and with moderate overnight humidity recovery. The area of low humidity will edge slightly toward the coast this weekend, as the marine layer becomes increasingly more shallow in response to ridging aloft. The gusty onshore winds across the interior areas beyond the edge of the marine layer -- wind directions generally from the west-southwest to northwest -- will combine with the low humidity to create elevated to brief critical fire-weather conditions through early next week. The areas of greatest concern for the heightened fire-weather potential will be across the Antelope Valley, the Antelope Valley Foothills, and the Interstate-5 corridor of northwest Los Angeles County. In addition, the gusty offshore winds over southwest Santa Barbara County, enhanced within Sundowner wind regimes, will also locally support the heightened fire-weather risk over the mountains and foothills. For areas experiencing the heightened fire-weather risk, 35-45-mph wind gusts are expected to combine with the low humidity occurring during the afternoon through the early overnight hours. However, for the southwest Santa Barbara County mountains and foothills, this wind and humidity combination will be delayed to some extent by Sundowner wind enhancements, when the greatest fire-weather risk will peak from the late afternoon into the overnight hours. Local gusts to 50 mph may also accompany the Sundowner wind regimes across the southwest Santa Barbara County mountains and foothills. Overall, the concern for heightened fire-weather conditions will mainly be restricted to grass fires, where fuel moistures will be driest. Also of note, in response to the ridging aloft and related retreating marine layer, very warm to hot conditions are forecast this weekend across interior areas, with highs in the 90s to the lower 100s. In the extended outlook -- covering the period from middle through latter parts of next week -- dry conditions will continue over the interior areas and southwest Santa Barbara County mountains and foothills. While weaker winds will limit the fire-weather risk to some extent, locally elevated fire-weather conditions will remain possible for middle to latter parts of next week. $$ ECC030-131600- Los Angeles County excluding Angeles National Forest- Discussion for Los Angeles ECC Dispatch 257 PM PDT Thu Jun 12 2025 ...ELEVATED TO BRIEF CRITICAL FIRE-WEATHER CONDITIONS ACROSS INTERIOR AREAS AND THE SOUTHWEST SANTA BARBARA COUNTY MOUNTAINS AND FOOTHILLS TODAY THROUGH EARLY NEXT WEEK DUE TO DRY CONDITIONS WITH WARM TO HOT TEMPERATURES AND GUSTY WINDS... Persistent thermal troughing over the southwest states will sustain -- through next week -- onshore flow over most areas, except for offshore flow over the southwest Santa Barbara County vicinity. Onshore flow and the accompanying marine layer will keep humidity high over the coasts and coastal valleys, aside from southwest Santa Barbara County vicinity. However, humidity values will quickly drop with inland extent away from the coast. Through next week, interior sections will experience minimum humidity from the teens to the 20s, with isolated locations in the single digits, and with moderate overnight humidity recovery. The area of low humidity will edge slightly toward the coast this weekend, as the marine layer becomes increasingly more shallow in response to ridging aloft. The gusty onshore winds across the interior areas beyond the edge of the marine layer -- wind directions generally from the west-southwest to northwest -- will combine with the low humidity to create elevated to brief critical fire-weather conditions through early next week. The areas of greatest concern for the heightened fire-weather potential will be across the Antelope Valley, the Antelope Valley Foothills, and the Interstate-5 corridor of northwest Los Angeles County. In addition, the gusty offshore winds over southwest Santa Barbara County, enhanced within Sundowner wind regimes, will also locally support the heightened fire-weather risk over the mountains and foothills. For areas experiencing the heightened fire-weather risk, 35-45-mph wind gusts are expected to combine with the low humidity occurring during the afternoon through the early overnight hours. However, for the southwest Santa Barbara County mountains and foothills, this wind and humidity combination will be delayed to some extent by Sundowner wind enhancements, when the greatest fire-weather risk will peak from the late afternoon into the overnight hours. Local gusts to 50 mph may also accompany the Sundowner wind regimes across the southwest Santa Barbara County mountains and foothills. Overall, the concern for heightened fire-weather conditions will mainly be restricted to grass fires, where fuel moistures will be driest. Also of note, in response to the ridging aloft and related retreating marine layer, very warm to hot conditions are forecast this weekend across interior areas, with highs in the 90s to the lower 100s. In the extended outlook -- covering the period from middle through latter parts of next week -- dry conditions will continue over the interior areas and southwest Santa Barbara County mountains and foothills. While weaker winds will limit the fire-weather risk to some extent, locally elevated fire-weather conditions will remain possible for middle to latter parts of next week. $$