Alert archive / California / Flash Flood Watches in 2021
Flash Flood Watch 1, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood watch at Jan 24, 2021, 5:19 PM PST for 7 counties in California. It took effect at Jan 26, 2021, 4:00 PM PST. It was in force for 49 hr.
The area
The counties it named.
The facts
- Issued
- Jan 24, 2021, 5:19 PM PST (01:19 UTC)
- In effect from
- Jan 26, 2021, 4:00 PM PST
- Expired
- Jan 28, 2021, 5:00 PM PST
- In force
- 49 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Flood severity
- None
Counties Marin County, CA, Monterey County, CA, Napa County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Sonoma County, CA
The radar
The San Francisco radar (KMUX), 53 km from the middle of the area, began a volume at 01:21 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
Reno, NV (KREV), launched 00:00Z, 1.3 hours before the alert went out and 412 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
- 1671 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -24 m²/s²
- 0-3 km storm-relative helicity
- -30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
046 WGUS66 KMTR 250119 FFAMTR URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Francisco CA 519 PM PST Sun Jan 24 2021 CAZ505>507-509-512-517-251330- /O.NEW.KMTR.FF.A.0001.210127T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal North Bay Including Point Reyes National Seashore-North Bay Interior Valleys-North Bay Mountains-San Francisco Peninsula Coast- Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Woodacre, Sausalito, Santa Rosa, Boulder Creek, Day Valley, Lagunitas-Forest Knolls, Angwin, Rohnert Park, San Rafael, Tamalpais-Homestead, South Santa Rosa, Pacifica, Petaluma, Napa, Novato, and Scotts Valley 519 PM PST Sun Jan 24 2021 ...FLASH FLOOD WATCH IN EFFECT FROM TUESDAY AFTERNOON THROUGH THURSDAY AFTERNOON... The National Weather Service in San Francisco has issued a * Flash Flood Watch for a portion of western California, including the following areas, Coastal North Bay Including Point Reyes National Seashore, North Bay Interior Valleys, North Bay Mountains, San Francisco Peninsula Coast, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * From Tuesday afternoon through Thursday afternoon * A moderate atmospheric river will impact the region Tuesday through Thursday bringing prolonged periods of moderate to heavy rain along with gusty south winds. The brunt of the storm is forecast to occur between Tuesday evening through Wednesday. * High confidence that thresholds for debris flows will be met for the following 2020 burn scars: Meyers, Walbridge, Glass, Hennessey, Woodward, CZU, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. && $$ BB
13 follow-up statements
047 WGUS66 KMTR 251312 FFAMTR Flood Watch National Weather Service San Francisco CA 512 AM PST Mon Jan 25 2021 CAZ505>507-509-512-517-252300- /O.CON.KMTR.FF.A.0001.210127T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal North Bay Including Point Reyes National Seashore-North Bay Interior Valleys-North Bay Mountains-San Francisco Peninsula Coast- Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Woodacre, Sausalito, Santa Rosa, Boulder Creek, Day Valley, Lagunitas-Forest Knolls, Angwin, Rohnert Park, San Rafael, Tamalpais-Homestead, South Santa Rosa, Pacifica, Petaluma, Napa, Novato, and Scotts Valley 512 AM PST Mon Jan 25 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM TUESDAY AFTERNOON THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, Coastal North Bay Including Point Reyes National Seashore, North Bay Interior Valleys, North Bay Mountains, San Francisco Peninsula Coast, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * From Tuesday afternoon through Thursday afternoon * A moderate atmospheric river will impact the region Tuesday through Thursday bringing prolonged periods of moderate to heavy rain along with gusty south winds. The brunt of the storm is forecast to occur between Tuesday evening through Wednesday. * High confidence that thresholds for debris flows will be met for the following 2020 burn scars: Meyers, Walbridge, Glass, Hennessey, Woodward, CZU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. && $$ MM
778 WGUS66 KMTR 252221 FFAMTR URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Francisco CA 221 PM PST Mon Jan 25 2021 CAZ511-260630- /O.EXA.KMTR.FF.A.0001.210127T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ East Bay Hills and the Diablo Range- Including the cities of Blackhawk 221 PM PST Mon Jan 25 2021 ...FLASH FLOOD WATCH IN EFFECT FROM TUESDAY AFTERNOON THROUGH THURSDAY AFTERNOON... The National Weather Service in San Francisco has expanded the * Flash Flood Watch to include a portion of western California, including the following area, East Bay Hills and the Diablo Range. * From Tuesday afternoon through Thursday afternoon * A moderate atmospheric river will impact the region Tuesday through Thursday bringing prolonged periods of moderate to heavy rain along with strong, potentially damaging southerly winds. The brunt of the storm is forecast to occur between Tuesday evening through Wednesday. * High confidence that thresholds for debris flows will be met for the following 2020 burn scars: SCU Lightning Complex. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CAZ505>507-509-512-517-260630- /O.CON.KMTR.FF.A.0001.210127T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal North Bay Including Point Reyes National Seashore-North Bay Interior Valleys-North Bay Mountains-San Francisco Peninsula Coast- Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Woodacre, Sausalito, Santa Rosa, Boulder Creek, Day Valley, Lagunitas-Forest Knolls, Angwin, Rohnert Park, San Rafael, Tamalpais-Homestead, South Santa Rosa, Pacifica, Petaluma, Napa, Novato, and Scotts Valley 221 PM PST Mon Jan 25 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM TUESDAY AFTERNOON THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, Coastal North Bay Including Point Reyes National Seashore, North Bay Interior Valleys, North Bay Mountains, San Francisco Peninsula Coast, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * From Tuesday afternoon through Thursday afternoon * A moderate atmospheric river will impact the region Tuesday through Thursday bringing prolonged periods of moderate to heavy rain along with strong, potentially damaging southerly winds. The brunt of the storm is forecast to occur between Tuesday evening through Wednesday. * High confidence that thresholds for debris flows will be met for the following 2020 burn scars: Meyers, Walbridge, Glass, Hennessey, Woodward, CZU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ RGass
795 WGUS66 KMTR 260607 FFAMTR Flood Watch National Weather Service San Francisco CA 1007 PM PST Mon Jan 25 2021 CAZ505>507-509-511-512-517-261700- /O.CON.KMTR.FF.A.0001.210127T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal North Bay Including Point Reyes National Seashore-North Bay Interior Valleys-North Bay Mountains-San Francisco Peninsula Coast- East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Woodacre, Sausalito, Santa Rosa, Boulder Creek, Day Valley, Lagunitas-Forest Knolls, Blackhawk, Angwin, Rohnert Park, San Rafael, Tamalpais-Homestead, South Santa Rosa, Pacifica, Petaluma, Napa, Novato, and Scotts Valley 1007 PM PST Mon Jan 25 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM TUESDAY AFTERNOON THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, Coastal North Bay Including Point Reyes National Seashore, East Bay Hills and the Diablo Range, North Bay Interior Valleys, North Bay Mountains, San Francisco Peninsula Coast, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * From Tuesday afternoon through Thursday afternoon * A moderate atmospheric river will impact the region Tuesday through Thursday bringing prolonged periods of moderate to heavy rain along with strong, potentially damaging southerly winds. The brunt of the storm is forecast to occur between Tuesday evening through Wednesday. * High confidence that thresholds for debris flows will be met for the following 2020 burn scars: Meyers, Walbridge, Glass, Hennessey, Woodward, CZU Lightning Complex, SCU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ MM
144 WGUS66 KMTR 261843 FFAMTR Flood Watch National Weather Service San Francisco CA 1043 AM PST Tue Jan 26 2021 CAZ505>507-509-511-512-517-270500- /O.CON.KMTR.FF.A.0001.210127T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal North Bay Including Point Reyes National Seashore-North Bay Interior Valleys-North Bay Mountains-San Francisco Peninsula Coast- East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Woodacre, Sausalito, Santa Rosa, Boulder Creek, Day Valley, Lagunitas-Forest Knolls, Blackhawk, Angwin, Rohnert Park, San Rafael, Tamalpais-Homestead, South Santa Rosa, Pacifica, Petaluma, Napa, Novato, and Scotts Valley 1043 AM PST Tue Jan 26 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 4 PM PST THIS AFTERNOON THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, Coastal North Bay Including Point Reyes National Seashore, East Bay Hills and the Diablo Range, North Bay Interior Valleys, North Bay Mountains, San Francisco Peninsula Coast, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * From 4 PM PST this afternoon through Thursday afternoon * A moderate atmospheric river will impact the region today through Thursday bringing prolonged periods of moderate to heavy rain along with strong, potentially damaging southerly winds. The brunt of the storm is forecast to occur between Tuesday evening through Wednesday. * High confidence that thresholds for debris flows will be met for the following 2020 burn scars: Meyers, Walbridge, Glass, Hennessey, Woodward, CZU Lightning Complex, SCU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CW
408 WGUS66 KMTR 270438 FFAMTR Flood Watch National Weather Service San Francisco CA 838 PM PST Tue Jan 26 2021 CAZ505>507-509-511-512-517-271400- /O.CON.KMTR.FF.A.0001.000000T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal North Bay Including Point Reyes National Seashore-North Bay Interior Valleys-North Bay Mountains-San Francisco Peninsula Coast- East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Woodacre, Sausalito, Santa Rosa, Boulder Creek, Day Valley, Lagunitas-Forest Knolls, Blackhawk, Angwin, Rohnert Park, San Rafael, Tamalpais-Homestead, South Santa Rosa, Pacifica, Petaluma, Napa, Novato, and Scotts Valley 838 PM PST Tue Jan 26 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, Coastal North Bay Including Point Reyes National Seashore, East Bay Hills and the Diablo Range, North Bay Interior Valleys, North Bay Mountains, San Francisco Peninsula Coast, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * Through Thursday afternoon * A moderate atmospheric river will impact the region today through Thursday bringing prolonged periods of moderate to heavy rain along with strong, potentially damaging southerly winds. The brunt of the storm is forecast to impact the region tonight through Wednesday. * High confidence that thresholds for debris flows will be met for the following 2020 burn scars: Meyers, Walbridge, Glass, Hennessey, Woodward, CZU Lightning Complex, SCU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CW
612 WGUS66 KMTR 271059 FFAMTR Flood Watch National Weather Service San Francisco CA 259 AM PST Wed Jan 27 2021 CAZ505>507-509-271200- /O.CAN.KMTR.FF.A.0001.000000T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal North Bay Including Point Reyes National Seashore-North Bay Interior Valleys-North Bay Mountains-San Francisco Peninsula Coast- Including the cities of Woodacre, Sausalito, Santa Rosa, Lagunitas-Forest Knolls, Angwin, Rohnert Park, San Rafael, Tamalpais-Homestead, South Santa Rosa, Pacifica, Petaluma, Napa, and Novato 259 AM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of Northern California, including the following areas, Coastal North Bay Including Point Reyes National Seashore, North Bay Interior Valleys, North Bay Mountains and San Francisco Peninsula Coast has been cancelled. The Flood Watch is cancelled. $$ CAZ511-512-517-271900- /O.CON.KMTR.FF.A.0001.000000T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Scotts Valley, Day Valley, Boulder Creek, and Blackhawk 259 AM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, East Bay Hills and the Diablo Range, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * Through Thursday afternoon * Even though the period of heaviest rains have ended the atmospheric river may stall over Monterey county and rotate northward over the CZU and SCU Lightning Complex burn area later tonight into early Thursday. More flash flood warnings may need to be issued over the next 24 hours. * Moderate to high confidence that thresholds for debris flows will be met for the following 2020 burn scars: CZU Lightning Complex, SCU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ RWW
549 WGUS66 KMTR 271848 FFAMTR Flood Watch National Weather Service San Francisco CA 1048 AM PST Wed Jan 27 2021 CAZ511-512-517-280615- /O.CON.KMTR.FF.A.0001.000000T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Scotts Valley, Day Valley, Boulder Creek, and Blackhawk 1048 AM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, East Bay Hills and the Diablo Range, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * Through Thursday afternoon * Even though the period of heaviest rains have ended the atmospheric river may stall over Monterey county and rotate northward over the CZU and SCU Lightning Complex burn area later tonight into early Thursday. More flash flood warnings may need to be issued over the next 24 hours. * Moderate to high confidence that thresholds for debris flows will be met for the following 2020 burn scars: CZU Lightning Complex, SCU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CW
790 WGUS66 KMTR 271919 FFAMTR URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Francisco CA 1119 AM PST Wed Jan 27 2021 CAZ507-280615- /O.EXA.KMTR.FF.A.0001.000000T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ North Bay Mountains- Including the cities of Woodacre, Lagunitas-Forest Knolls, and Angwin 1119 AM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH FOR THE HENNESSEY PORTION OF THE LNU LIGHTNING COMPLEX BURN AREA IN EFFECT THROUGH THURSDAY AFTERNOON... The National Weather Service in San Francisco has expanded the * Flash Flood Watch to include a portion of western California, including the following area, North Bay Mountains. * Through Thursday afternoon * National Weather Service Meteorologists are forecasting moderate to heavy rainfall over the Hennessey portion of the LNU Lightning Complex burn area, which may lead to flash flooding and debris flows. * Periods of light to moderate rainfall are expected through the day today over the Hennessey portion of the LNU Lightning Complex burn area. Rain rates and intensities are expected to increase as a secondary boundary sets up over the burn area by mid to late evening. Moderate to heavy rainfall is expected to accompany embedded thunderstorms that develop along the boundary this evening through Thursday afternoon. Residents near the Hennessey portion of the LNU Lightning Complex burn area should prepare for potential flooding impacts. Be sure to stay up to date with information from local authorities. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CAZ511-512-517-280615- /O.CON.KMTR.FF.A.0001.000000T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Scotts Valley, Day Valley, Boulder Creek, and Blackhawk 1119 AM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, East Bay Hills and the Diablo Range, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * Through Thursday afternoon * Even though the period of heaviest rains have ended the atmospheric river may stall over Monterey county and rotate northward over the CZU and SCU Lightning Complex burn area later tonight into early Thursday. More flash flood warnings may need to be issued over the next 24 hours. * Moderate to high confidence that thresholds for debris flows will be met for the following 2020 burn scars: CZU Lightning Complex, SCU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CW
386 WGUS66 KMTR 271940 FFAMTR URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Francisco CA 1140 AM PST Wed Jan 27 2021 CAZ506-280615- /O.EXA.KMTR.FF.A.0001.000000T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ North Bay Interior Valleys- Including the cities of Rohnert Park, Santa Rosa, San Rafael, South Santa Rosa, Petaluma, Napa, and Novato 1140 AM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH FOR THE WALBRIDGE PORTION OF THE LNU LIGHTNING COMPLEX BURN AREA IN EFFECT THROUGH THURSDAY AFTERNOON... The National Weather Service in San Francisco has expanded the * Flash Flood Watch to include a portion of western California, including the following area, North Bay Interior Valleys. * Through Thursday afternoon * National Weather Service Meteorologists are forecasting moderate to heavy rainfall over the Walbridge portion of the LNU Lightning Complex burn area, which may lead to flash flooding and debris flows. * Periods of light to moderate rainfall are expected through the day today over the Walbridge portion of the LNU Lightning Complex burn area. Rain rates and intensities are expected to increase as a secondary boundary sets up over the burn area by mid to late evening. Moderate to heavy rainfall is expected to accompany embedded thunderstorms that develop along the boundary this evening through Thursday afternoon. Residents near the Walbridge portion of the LNU Lightning Complex burn area should prepare for potential flooding impacts. Be sure to stay up to date with information from local authorities. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CAZ511-512-517-280615- /O.CON.KMTR.FF.A.0001.000000T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Scotts Valley, Day Valley, Boulder Creek, and Blackhawk 1140 AM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, East Bay Hills and the Diablo Range, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * Through Thursday afternoon * Even though the period of heaviest rains have ended the atmospheric river may stall over Monterey county and rotate northward over the CZU and SCU Lightning Complex burn area later tonight into early Thursday. More flash flood warnings may need to be issued over the next 24 hours. * Moderate to high confidence that thresholds for debris flows will be met for the following 2020 burn scars: CZU Lightning Complex, SCU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CAZ507-280615- /O.CON.KMTR.FF.A.0001.000000T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ North Bay Mountains- Including the cities of Woodacre, Lagunitas-Forest Knolls, and Angwin 1140 AM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH FOR THE HENNESSEY PORTION OF THE LNU LIGHTNING COMPLEX BURN AREA REMAINS IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * The Walbridge portion of the LNU Lightning Complex burn area in a portion of western California, including the following area, North Bay Mountains. * Through Thursday afternoon * National Weather Service Meteorologists are forecasting moderate to heavy rainfall over the Hennessey portion of the LNU Lightning Complex burn area, which may lead to flash flooding and debris flows. * Periods of light to moderate rainfall are expected through the day today over the Hennessey portion of the LNU Lightning Complex burn area. Rain rates and intensities are expected to increase as a secondary boundary sets up over the burn area by mid to late evening. Moderate to heavy rainfall is expected to accompany embedded thunderstorms that develop along the boundary this evening through Thursday afternoon. Residents near the Hennessey portion of the LNU Lightning Complex burn area should prepare for potential flooding impacts. Be sure to stay up to date with information from local authorities. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CW
140 WGUS66 KMTR 272026 FFAMTR URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Francisco CA 1226 PM PST Wed Jan 27 2021 CAZ506-507-280600- /O.EXT.KMTR.FF.A.0001.000000T0000Z-210129T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ North Bay Interior Valleys-North Bay Mountains- Including the cities of Rohnert Park, Santa Rosa, Lagunitas-Forest Knolls, Angwin, San Rafael, Woodacre, South Santa Rosa, Petaluma, Napa, and Novato 1226 PM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH FOR THE 2020 BURN AREAS IN NAPA AND SONOMA COUNTIES NOW IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch is now in effect for * A portion of western California, including the following areas, North Bay Interior Valleys and North Bay Mountains. * Through Thursday afternoon * National Weather Service Meteorologists are forecasting periods of moderate to heavy rainfall over the 2020 Burn Areas in Napa and Sonoma Counties, which may lead to flash flooding and debris flows. * Periods of light to moderate rainfall are expected through the day today over the 2020 Burn Areas in Napa and Sonoma Counties. Rain rates and intensities are expected to increase as a secondary boundary sets up over the burn area by mid to late evening. Moderate to heavy rainfall is expected to accompany embedded thunderstorms that develop along the boundary this evening through Thursday afternoon. Residents near the 2020 Burn Areas in Napa and Sonoma Counties should prepare for potential flooding impacts. Be sure to stay up to date with information from local authorities. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CAZ511-512-517-280600- /O.CON.KMTR.FF.A.0001.000000T0000Z-210129T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Scotts Valley, Day Valley, Boulder Creek, and Blackhawk 1226 PM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, East Bay Hills and the Diablo Range, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * Through Thursday afternoon * Even though the period of heaviest rains have ended the atmospheric river may stall over Monterey county and rotate northward over the CZU and SCU Lightning Complex burn area later tonight into early Thursday. More flash flood warnings may need to be issued over the next 24 hours. * Moderate to high confidence that thresholds for debris flows will be met for the following 2020 burn scars: CZU Lightning Complex, SCU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be rapid ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CW
593 WGUS66 KMTR 280606 FFAMTR URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Francisco CA 1006 PM PST Wed Jan 27 2021 CAZ511-512-517-281815- /O.EXT.KMTR.FF.A.0001.000000T0000Z-210129T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Scotts Valley, Day Valley, Boulder Creek, and Blackhawk 1006 PM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch is now in effect for * A portion of western California, including the following areas, East Bay Hills and the Diablo Range, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * Through Thursday afternoon * An atmospheric river will continue to produce moderate to heavy rain across Monterey County through Wednesday Night. Farther north, showers and possible thunderstorms will produce brief heavy rain Wednesday night. Scattered showers and isolated thunderstorms will continue through Thursday. * Moderate confidence that thresholds for debris flows will be met for the following 2020 burn scars: CZU Lightning Complex, SCU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CAZ506-507-281815- /O.CON.KMTR.FF.A.0001.000000T0000Z-210129T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ North Bay Interior Valleys-North Bay Mountains- Including the cities of Rohnert Park, Santa Rosa, Lagunitas-Forest Knolls, Angwin, San Rafael, Woodacre, South Santa Rosa, Petaluma, Napa, and Novato 1006 PM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH FOR THE 2020 BURN AREAS IN NAPA AND SONOMA COUNTIES REMAINS IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch continues for * The 2020 Burn Areas in Napa and Sonoma Counties in a portion of western California, including the following areas, North Bay Interior Valleys and North Bay Mountains. * Through Thursday afternoon * Showers and isolated thunderstorms are forecast Wednesday night through Thursday. These showers and thunderstorms may result in brief periods of intense rainfall which could trigger debris flows or flash flooding on the burn scars. * Rain rates and intensities are expected to increase as showers and isolated thunderstorms increase across the burn areas overnight. Brief heavy rain is possible with showers and thunderstorms through Thursday afternoon. Residents near the 2020 Burn Areas in Napa and Sonoma Counties should prepare for potential flooding impacts. The burn scars include the Hennessey, the Walbridge, and the Glass. Be sure to stay up to date with information from local authorities. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ DD
868 WGUS66 KMTR 281805 FFAMTR Flood Watch National Weather Service San Francisco CA 1005 AM PST Thu Jan 28 2021 CAZ511-512-517-290100- /O.CON.KMTR.FF.A.0001.000000T0000Z-210129T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Scotts Valley, Day Valley, Boulder Creek, and Blackhawk 1005 AM PST Thu Jan 28 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 5 PM PST THIS AFTERNOON... The Flash Flood Watch continues for * A portion of western California, including the following areas, East Bay Hills and the Diablo Range, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest. * Until 5 PM PST this afternoon * National Weather Service Meteorologists are forecasting scattered rain showers with the potential for isolated thunderstorms through Thursday afternoon, which may lead to flash flooding and debris flows. * These showers and/or thunderstorms may briefly meet thresholds for debris flows over the following 2020 burn scars: CZU Lightning Complex, SCU Lightning Complex, Carmel/River, and Dolan. For non-burn scar areas, there could be ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ CAZ506-507-290100- /O.CON.KMTR.FF.A.0001.000000T0000Z-210129T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ North Bay Interior Valleys-North Bay Mountains- Including the cities of Rohnert Park, Santa Rosa, Lagunitas-Forest Knolls, Angwin, San Rafael, Woodacre, South Santa Rosa, Petaluma, Napa, and Novato 1005 AM PST Thu Jan 28 2021 ...FLASH FLOOD WATCH FOR THE 2020 BURN AREAS IN NAPA AND SONOMA COUNTIES REMAINS IN EFFECT UNTIL 5 PM PST THIS AFTERNOON... The Flash Flood Watch continues for * The 2020 Burn Areas in Napa and Sonoma Counties in a portion of western California, including the following areas, North Bay Interior Valleys and North Bay Mountains. * Until 5 PM PST this afternoon * National Weather Service Meteorologists are forecasting scattered rain showers with the potential for isolated thunderstorms through Thursday afternoon, which may lead to flash flooding and debris flows. * These showers and/or thunderstorms may briefly meet thresholds for debris flows over the 2020 Burn Areas in Napa and Sonoma Counties. For non-burn scar areas, there could be ponding of water in urban areas, and low lying areas with poor drainage. We also cannot rule out slides or wash outs in areas of steep terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you live near or on a burn scar: make sure you are signed up for your county's reverse 911 or other alert system and have a "go bag" ready. Monitor the weather for forecast updates and heed local official orders. Do not cross flooded roadways, turn around don't drown. && $$ RGass
663 WGUS66 KMTR 290058 FFAMTR Flood Watch National Weather Service San Francisco CA 458 PM PST Thu Jan 28 2021 CAZ506-507-511-512-517-290200- /O.EXP.KMTR.FF.A.0001.000000T0000Z-210129T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ North Bay Interior Valleys-North Bay Mountains-East Bay Hills and the Diablo Range-Santa Cruz Mountains-Santa Lucia Mountains and Los Padres National Forest- Including the cities of Scotts Valley, Rohnert Park, Santa Rosa, Boulder Creek, Day Valley, Lagunitas-Forest Knolls, Blackhawk, Angwin, San Rafael, Woodacre, South Santa Rosa, Petaluma, Napa, and Novato 458 PM PST Thu Jan 28 2021 ...FLASH FLOOD WATCH FOR THE 2020 BURN AREAS WILL EXPIRE AT 5 PM PST THIS AFTERNOON... The Flash Flood Watch for a portion of western California, including the following areas, East Bay Hills and the Diablo Range, North Bay Interior Valleys, North Bay Mountains, Santa Cruz Mountains and Santa Lucia Mountains and Los Padres National Forest will expire AT 5 PM PST this afternoon. The Flood Watch will be allowed to expire at 5 PM PST. Flooding and debris flows are no longer expected to pose a threat. However, brief heavy rain is still possible with showers and possible thunderstorms through tonight. Please continue to heed remaining road closures. $$ DD
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 25, 2:55 AM PST | High Wind Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 12 hr |
| Jan 25, 1:42 PM PST | Storm Watch | MTR | 13 hr | |
| Jan 25, 2:42 PM PST | Freeze Warning | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, Santa Clara and 1 more | 17 hr |
| Jan 25, 2:42 PM PST | High Wind Warning | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Clara, Santa Cruz and 1 more | 45 hr |
| Jan 25, 2:42 PM PST | Wind Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 3 more | 61 hr |
Nearby
Flash Flood Watches in California, 2021Every flash flood watch 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.