Alert archive / California / Flash Flood Watches in 2021
Flash Flood Watch 2, NWS San Diego, CA
NWS San Diego, CA issued this flash flood watch at Jan 27, 2021, 10:58 AM PST for 4 counties in California. It took effect at Jan 28, 2021, 7:00 PM PST. It was in force for 21 hr.
The area
The counties it named.
The facts
- Issued
- Jan 27, 2021, 10:58 AM PST (18:58 UTC)
- In effect from
- Jan 28, 2021, 7:00 PM PST
- Expired
- Jan 29, 2021, 4:00 PM PST
- In force
- 21 hr
- Issued by
- NWS San Diego, CA
- Flood severity
- None
Counties Orange County, CA, Riverside County, CA, San Bernardino County, CA, San Diego County, CA
The radar
The Santa Ana Mts radar (KSOX), 88 km from the middle of the area, began a volume at 18:57 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, 7.0 hours before the alert went out and 124 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
- 1202 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
134 WGUS66 KSGX 271858 FFASGX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Diego CA 1058 AM PST Wed Jan 27 2021 CAZ043-048-050-055>058-552-554-280615- /O.NEW.KSGX.FF.A.0002.210129T0300Z-210130T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego County Coastal Areas-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Valleys-San Bernardino County Mountains-Riverside County Mountains-Santa Ana Mountains and Foothills-San Diego County Mountains-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Vista, Ontario, Santee, Idyllwild-Pine Cove, Fontana, Garden Grove, Fullerton, Orange, Santa Ana, National City, Riverside, Poway, Big Bear Lake, Oceanside, Big Bear City, San Diego, Lake Arrowhead, Irvine, El Cajon, Newport Beach, Escondido, Chula Vista, Crestline, San Clemente, Wrightwood, Corona, Anaheim, Huntington Beach, San Bernardino, Moreno Valley, Mission Viejo, Laguna Beach, Julian, Pine Valley, Costa Mesa, La Mesa, Encinitas, Running Springs, San Marcos, Carlsbad, and Rancho Cucamonga 1058 AM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH IN EFFECT FROM THURSDAY EVENING THROUGH FRIDAY AFTERNOON... The National Weather Service in San Diego has issued a * Flash Flood Watch for a portion of southwest California, including the following areas, the Apple burn scar, El Dorado burn scar, Bond burn scar, Silverado burn scar, Blue Ridge burn scar, and Valley burn scar, Orange County Coastal Areas, Orange County Inland Areas, Riverside County Mountains below 5500 ft, San Bernardino County Mountains below 5500 ft, San Bernardino and Riverside County Valleys-The Inland Empire, San Diego County Coastal Areas, San Diego County Mountains below 5500 ft, San Diego County Valleys and Santa Ana Mountains and Foothills. * From Thursday evening through Friday afternoon * Moderate to heavy rain showers will impact areas west of the mountains below 5500 ft, including the Apple, El Dorado, Bond, Silverado, Blueridge, and Valley burn scars. Showers will develop Thursday evening, becoming more widespread late Thursday into Friday. The heaviest rain is expected to begin before midnight on Thursday, lasting through Friday morning in Orange County and the Inland Empire. Periods of heavy rain are expected early Friday morning through Friday afternoon in San Diego County. Rain rates of 0.50 inch to 0.60 inch an hour are expected. There is a slight chance of thunderstorms Thursday night and Friday. Rain totals of 1.25-1.50 inches, locally up to 1.70 expected for the coast, valleys, and Inland Empire with totals 2-3 inches on the coastal slopes of the mountains below 5500 ft. * Heavy rainfall can lead to areas of flash flooding, as well as mud and debris flows near burn scars, especially the Apple, El Dorado, and Bond burn scars. PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay away or be swept away. Know your escape routes. Be ready to act immediately and heed all evacuation orders. Keep updated on the latest weather forecasts. && $$ CO
7 follow-up statements
561 WGUS66 KSGX 280510 FFASGX FLOOD WATCH NATIONAL WEATHER SERVICE San Diego CA 910 PM PST Wed Jan 27 2021 CAZ043-048-050-055>058-552-554-281400- /O.CON.KSGX.FF.A.0002.210129T0300Z-210130T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego County Coastal Areas- San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Valleys-San Bernardino County Mountains- Riverside County Mountains-Santa Ana Mountains and Foothills- San Diego County Mountains-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Oceanside, Vista, Carlsbad, Encinitas, Chula Vista, National City, San Diego, Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, Pine Valley, Huntington Beach, Costa Mesa, Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo 910 PM PST Wed Jan 27 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM THURSDAY EVENING THROUGH FRIDAY AFTERNOON... The Flash Flood Watch continues for * A portion of southwest California...including the following areas - Orange County...Coastal Areas and Inland Areas... Riverside County Mountains...San Bernardino County Mountains... San Bernardino and Riverside County Valleys-The Inland Empire...San Diego County Coastal Areas...San Diego County Mountains...San Diego County Valleys and Santa Ana Mountains and Foothills. * from Thursday evening through Friday afternoon * Moderate to heavy rain showers will impact areas west of the mountains below 5500 ft, including the Apple, El Dorado, Bond, Silverado, Blue Ridge, and Valley burn scars. Showers will develop Thursday evening, becoming more widespread late Thursday into Friday. The heaviest rain is expected to begin before midnight on Thursday, lasting through Friday morning in Orange County and the Inland Empire. Periods of heavy rain are expected early Friday morning through Friday afternoon in San Diego County. Rain rates of 0.50 inch to 0.60 inch an hour are expected. There is a slight chance of thunderstorms Thursday night and Friday. Rain totals of 1.25-1.50 inches, locally up to 1.70 expected for the coast, valleys, and Inland Empire with totals 2-3 inches on the coastal slopes of the mountains below 5500 ft. * Heavy rainfall can lead to areas of flash flooding, as well as mud and debris flows near burn scars, especially the Apple, El Dorado, and Bond burn scars. PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay away or be swept away. Know your escape routes. Be ready to act immediately and heed all evacuation orders. Keep updated on the latest weather forecasts. && $$ APR
012 WGUS66 KSGX 281132 FFASGX Flood Watch National Weather Service San Diego CA 332 AM PST Thu Jan 28 2021 CAZ043-048-050-055>058-552-554-281945- /O.CON.KSGX.FF.A.0002.210129T0300Z-210130T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego County Coastal Areas-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Valleys-San Bernardino County Mountains-Riverside County Mountains-Santa Ana Mountains and Foothills-San Diego County Mountains-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Vista, Ontario, Santee, Idyllwild-Pine Cove, Fontana, Garden Grove, Fullerton, Orange, Santa Ana, National City, Riverside, Poway, Big Bear Lake, Oceanside, Big Bear City, San Diego, Lake Arrowhead, Irvine, El Cajon, Newport Beach, Escondido, Chula Vista, Crestline, San Clemente, Wrightwood, Corona, Anaheim, Huntington Beach, San Bernardino, Moreno Valley, Mission Viejo, Laguna Beach, Julian, Pine Valley, Costa Mesa, La Mesa, Encinitas, Running Springs, San Marcos, Carlsbad, and Rancho Cucamonga 332 AM PST Thu Jan 28 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH FRIDAY AFTERNOON... The Flash Flood Watch continues for * Coast, valleys, and mountains below 5500 feet in southwestern California. * From this evening through Friday afternoon * Showers with moderate to locally heavy rainfall will impact areas west of the mountains below 5500 feet, including the Apple, El Dorado, Bond, Silverado, Blueridge, and Valley burn scars. Showers will develop this evening, becoming more widespread tonight into Friday. The heaviest rain is expected to begin before midnight, lasting through 6 AM Friday with periods of showers continuing through Friday afternoon. Rainfall rates of 0.50 inch to 0.60 inch per hour are expected. There is a slight chance of thunderstorms tonight and Friday. Rainfall is expected to range from around 1.5 inch near the coast to 2 inches near the lower coastal slopes of the mountains, with 2 to 3 inches of rainfall on coastal slopes of the mountains below 5500 feet. * Heavy rainfall can lead to areas of flash flooding, as well as mud and debris flows near burn scars, especially the Apple, El Dorado, and Bond burn scars. PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay away or be swept away. Know your escape routes. Be ready to act immediately and heed all evacuation orders. Keep updated on the latest weather forecasts. && $$ 17
566 WGUS66 KSGX 282057 FFASGX Flood Watch National Weather Service San Diego CA 1257 PM PST Thu Jan 28 2021 CAZ043-048-050-055>058-552-554-290615- /O.CON.KSGX.FF.A.0002.210129T0300Z-210130T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego County Coastal Areas-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Valleys-San Bernardino County Mountains-Riverside County Mountains-Santa Ana Mountains and Foothills-San Diego County Mountains-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Vista, Ontario, Santee, Idyllwild-Pine Cove, Fontana, Garden Grove, Fullerton, Orange, Santa Ana, National City, Riverside, Poway, Big Bear Lake, Oceanside, Big Bear City, San Diego, Lake Arrowhead, Irvine, El Cajon, Newport Beach, Escondido, Chula Vista, Crestline, San Clemente, Wrightwood, Corona, Anaheim, Huntington Beach, San Bernardino, Moreno Valley, Mission Viejo, Laguna Beach, Julian, Pine Valley, Costa Mesa, La Mesa, Encinitas, Running Springs, San Marcos, Carlsbad, and Rancho Cucamonga 1257 PM PST Thu Jan 28 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 7 PM PST THIS EVENING THROUGH FRIDAY AFTERNOON... The Flash Flood Watch continues for * Coast, valleys, and mountains below 5500 feet in southwestern California. Including the Apple, El Dorado, Bond, Blue Ridge, Silverado, and Valley burn scars. * From 7 PM PST this evening through Friday afternoon * Showers with moderate to locally heavy rainfall will impact areas west of the mountains below 5500 feet, including the Apple, El Dorado, Bond, Silverado, Blueridge, and Valley burn scars. Showers will develop this evening, becoming more widespread tonight into Friday. The heaviest rain is expected to begin before midnight, lasting through 6 AM Friday with periods of showers continuing through Friday afternoon. Rainfall rates of 0.50 inch to 0.60 inch per hour are expected. There is a slight chance of thunderstorms tonight and Friday. Rainfall is expected to range from around 1.5 inches near the coast to 2 inches near the lower coastal slopes of the mountains, with 2 to 3 inches of rainfall on coastal slopes of the mountains below 5500 feet. * Heavy rainfall can lead to areas of flash flooding, as well as mud and debris flows near burn scars, especially the Apple, El Dorado, and Bond burn scars. PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay away or be swept away. Know your escape routes. Be ready to act immediately and heed all evacuation orders. Keep updated on the latest weather forecasts. && $$ CO
128 WGUS66 KSGX 290521 FFASGX FLOOD WATCH NATIONAL WEATHER SERVICE San Diego CA 921 PM PST Thu Jan 28 2021 CAZ043-048-050-055>058-552-554-291400- /O.CON.KSGX.FF.A.0002.000000T0000Z-210130T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego County Coastal Areas- San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Valleys-San Bernardino County Mountains- Riverside County Mountains-Santa Ana Mountains and Foothills- San Diego County Mountains-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Oceanside, Vista, Carlsbad, Encinitas, Chula Vista, National City, San Diego, Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, Pine Valley, Huntington Beach, Costa Mesa, Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo 921 PM PST Thu Jan 28 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH FRIDAY AFTERNOON... The Flash Flood Watch continues for * Coast, valleys, and mountains below 5500 feet in southwestern California. Including the Apple, El Dorado, Bond, Blue Ridge, Silverado, and Valley burn scars. * Showers with moderate to locally heavy rainfall will continue to impact areas west of the mountains below 5500 feet, including the Apple, El Dorado, Bond, Silverado, Blue Ridge, and Valley burn scars. The heaviest rain will slowly progress to the east over the region tonight into Friday morning, with periods of showers continuing through Friday afternoon and early evening. Rainfall rates of 0.50 inch to 0.60 inch per hour are expected. There is a slight chance of thunderstorms tonight and Friday. Rainfall is expected to range from around 1.5 inches near the coast to 2 inches near the lower coastal slopes of the mountains, with 2 to 3 inches of rainfall on coastal slopes of the mountains below 5500 feet. * Heavy rainfall can lead to areas of flash flooding, as well as mud and debris flows near burn scars, especially the Apple, El Dorado, and Bond burn scars. PRECAUTIONARY/PREPAREDNESS ACTIONS... TURN AROUND, DON'T DROWN. Know your escape routes, and be ready to act immediately and heed all evacuation orders. Keep updated on the latest weather forecasts on our website and social media. && $$ APR
021 WGUS66 KSGX 291156 FFASGX FLOOD WATCH NATIONAL WEATHER SERVICE San Diego CA 356 AM PST Fri Jan 29 2021 CAZ043-048-050-055>058-552-554-292000- /O.CON.KSGX.FF.A.0002.000000T0000Z-210130T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego County Coastal Areas- San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Valleys-San Bernardino County Mountains- Riverside County Mountains-Santa Ana Mountains and Foothills- San Diego County Mountains-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Oceanside, Vista, Carlsbad, Encinitas, Chula Vista, National City, San Diego, Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, Pine Valley, Huntington Beach, Costa Mesa, Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo 356 AM PST Fri Jan 29 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS AFTERNOON... The Flash Flood Watch continues for * Orange County...the Inland Empire...San Diego County Coastal, Valley and Mountains...and Santa Ana Mountains and Foothills. * through this afternoon * Heavy rainfall can lead to areas of flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... Know your escape routes, and be ready to act immediately and heed all evacuation orders. Keep updated on the latest weather forecasts on our website and social media. && $$ Moede
451 WGUS66 KSGX 292054 FFASGX Flood Watch National Weather Service San Diego CA 1254 PM PST Fri Jan 29 2021 CAZ043-048-050-055>058-552-554-300000- /O.CON.KSGX.FF.A.0002.000000T0000Z-210130T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego County Coastal Areas-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Valleys-San Bernardino County Mountains-Riverside County Mountains-Santa Ana Mountains and Foothills-San Diego County Mountains-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Vista, Ontario, Santee, Idyllwild-Pine Cove, Fontana, Garden Grove, Fullerton, Orange, Santa Ana, National City, Riverside, Poway, Big Bear Lake, Oceanside, Big Bear City, San Diego, Lake Arrowhead, Irvine, El Cajon, Newport Beach, Escondido, Chula Vista, Crestline, San Clemente, Wrightwood, Corona, Anaheim, Huntington Beach, San Bernardino, Moreno Valley, Mission Viejo, Laguna Beach, Julian, Pine Valley, Costa Mesa, La Mesa, Encinitas, Running Springs, San Marcos, Carlsbad, and Rancho Cucamonga 1254 PM PST Fri Jan 29 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 4 PM PST THIS AFTERNOON... The Flash Flood Watch continues for * Coast, valleys, and mountains below 5500 feet in southwestern California. Including the Apple, El Dorado, Bond, Blue Ridge, Silverado, and Valley burn scars. * Until 4 PM PST this afternoon * Areas of moderate to locally heavy showers will continue through the afternoon. Rain rates 0.20 inch to 0.30 inch are expected. There is a chance of thunderstorms. Rain will end from the northwest to southeast later this afternoon into tonight. * Heavy rainfall can lead to areas of flash flooding, as well as mud and debris flows near burn scars, especially the Apple, El Dorado, and Bond burn scars. PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay away or be swept away. Know your escape routes. Be ready to act immediately and heed all evacuation orders. Keep updated on the latest weather forecasts. && $$ CO
510 WGUS66 KSGX 300007 FFASGX FLOOD WATCH NATIONAL WEATHER SERVICE San Diego CA 407 PM PST Fri Jan 29 2021 CAZ043-048-050-055>058-552-554-300115- /O.EXP.KSGX.FF.A.0002.000000T0000Z-210130T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego County Coastal Areas- San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Valleys-San Bernardino County Mountains- Riverside County Mountains-Santa Ana Mountains and Foothills- San Diego County Mountains-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Oceanside, Vista, Carlsbad, Encinitas, Chula Vista, National City, San Diego, Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, Pine Valley, Huntington Beach, Costa Mesa, Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo 407 PM PST Fri Jan 29 2021 ...FLASH FLOOD WATCH HAS EXPIRED... The Flash Flood Watch for A portion of southwest California has expired. While a final band of heavy showers moves through San Diego County, the threat of flash flooding has diminished and will continue to diminish through 5 pm. $$
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 27, 12:58 PM PST | Winter Storm Warning | SGX | Riverside, San Bernardino | 50 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.