Alert archive / California / Flash Flood Watches in 2021
Flash Flood Watch 3, NWS San Diego, CA
NWS San Diego, CA issued this flash flood watch at Mar 10, 2021, 2:02 PM PST for Orange County, Riverside County, San Diego County, California. It was in force for 38 hr.
The area
The counties it named.
The facts
- Issued
- Mar 10, 2021, 2:02 PM PST (22:02 UTC)
- Expired
- Mar 12, 2021, 4:00 AM PST
- In force
- 38 hr
- Issued by
- NWS San Diego, CA
- Flood severity
- None
Counties Orange County, CA, Riverside County, CA, San Diego County, CA
The radar
The San Diego radar (KNKX), 65 km from the middle of the area, began a volume at 22:05 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, 10.0 hours before the alert went out and 83 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
- 106 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 664 m above ground
- 0-6 km bulk shear
- 100 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
030 WGUS66 KSGX 102202 FFASGX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Diego CA 202 PM PST Wed Mar 10 2021 CAZ057-554-110615- /O.NEW.KSGX.FF.A.0003.210310T2202Z-210312T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Santa Ana Mountains and Foothills-Orange County Inland Areas- Including the cities of Mission Viejo, Garden Grove, Fullerton, Irvine, Orange, Anaheim, and Santa Ana 202 PM PST Wed Mar 10 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH THURSDAY EVENING... The National Weather Service in San Diego has issued a * Flash Flood Watch for the Silverado and Bond Burn Scars in Orange County. * Through Thursday evening * Scattered showers and isolated thunderstorms will continue through Thursday evening, with the potential for heavy downpours. * This additional rain of one-half to three-quarters of an inch, may lead to additional debris flows in and around the burn scars. PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay away or be swept away. River banks and culverts can become unstable and unsafe. && $$ Brotherton
3 follow-up statements
128 WGUS66 KSGX 110704 FFASGX Flood Watch National Weather Service San Diego CA 1104 PM PST Wed Mar 10 2021 CAZ057-554-112200- /O.CON.KSGX.FF.A.0003.000000T0000Z-210312T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Santa Ana Mountains and Foothills-Orange County Inland Areas- Including the cities of Mission Viejo, Garden Grove, Fullerton, Irvine, Orange, Anaheim, and Santa Ana 1104 PM PST Wed Mar 10 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY EVENING... The Flash Flood Watch continues for * Flash Flood Watch for the Silverado and Bond Burn Scars in Orange County. * Through Thursday evening * Scattered showers and isolated thunderstorms will continue through Thursday evening, with the potential for heavy downpours. * This additional rain of one-half to three-quarters of an inch, may lead to additional debris flows in and around the burn scars. PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay away or be swept away. River banks and culverts can become unstable and unsafe. && $$ Gregoria
729 WGUS66 KSGX 111605 FFASGX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Diego CA 805 AM PST Thu Mar 11 2021 CAZ057-554-120600- /O.EXT.KSGX.FF.A.0003.000000T0000Z-210312T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Santa Ana Mountains and Foothills-Orange County Inland Areas- Including the cities of Mission Viejo, Garden Grove, Fullerton, Irvine, Orange, Anaheim, and Santa Ana 805 AM PST Thu Mar 11 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch is now in effect for * For the Silverado and Bond Burn Scars in Orange County. * Through late tonight * Scattered showers and isolated thunderstorms will continue through late tonight, with the potential for heavy downpours. There will likely be a lull in the activity during the day today, with renewed activity beginning around sunset and continuing through late tonight. * Rain rates around 0.3" per hour could trigger debris flows once again in and near the Silverado and Bond Burn Scars. PRECAUTIONARY/PREPAREDNESS ACTIONS... Do not enter or cross flowing water or water of unknown depth. Stay away or be swept away. River banks and culverts can become unstable and unsafe. && $$ Brotherton
145 WGUS66 KSGX 120539 FFASGX Flood Watch National Weather Service San Diego CA 939 PM PST Thu Mar 11 2021 CAZ057-554-121200- /O.CON.KSGX.FF.A.0003.000000T0000Z-210312T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Santa Ana Mountains and Foothills-Orange County Inland Areas- Including the cities of Mission Viejo, Garden Grove, Fullerton, Irvine, Orange, Anaheim, and Santa Ana 939 PM PST Thu Mar 11 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY... The Flash Flood Watch continues for * For the Silverado and Bond Burn Scars in Orange County. * Until 4 AM PST Friday * Isolated showers will continue to be possible which could impact the burn scars. * Rain rates around 0.3" per hour could trigger debris flows once again in and near the Silverado and Bond Burn Scars. PRECAUTIONARY/PREPAREDNESS ACTIONS... Do not enter or cross flowing water or water of unknown depth. Stay away or be swept away. River banks and culverts can become unstable and unsafe. && $$ Gregoria
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 10, 11:21 AM PST | Beach Hazards Statement | SGX | Orange, San Diego | 15 hr |
| Mar 10, 12:40 PM PST | Special Weather Statement | SGX | San Diego | 50 min |
| Mar 10, 12:43 PM PST | Special Marine Warning | SGX | 32 min | |
| Mar 10, 2:22 PM PST | Winter Weather Advisory | SGX | Orange, Riverside, San Bernardino, San Diego | 20 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.