Alert archive / California / Flash Flood Watches in 2021
Flash Flood Watch 8, NWS San Diego, CA
NWS San Diego, CA issued this flash flood watch at Sep 24, 2021, 8:56 AM PDT for Riverside County, San Diego County, California. It took effect at Sep 24, 2021, 10:00 AM PDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Sep 24, 2021, 8:56 AM PDT (15:56 UTC)
- In effect from
- Sep 24, 2021, 10:00 AM PDT
- Expired
- Sep 24, 2021, 7:00 PM PDT
- In force
- 9 hr
- Issued by
- NWS San Diego, CA
- Flood severity
- None
Counties Riverside County, CA, San Diego County, CA
The radar
The San Diego radar (KNKX), 80 km from the middle of the area, began a volume at 15:57 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, 3.9 hours before the alert went out and 100 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
- 1990 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -36 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
274 WGUS66 KSGX 241556 FFASGX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Diego CA 856 AM PDT Fri Sep 24 2021 CAZ056-058-061-062-250200- /O.NEW.KSGX.FF.A.0008.210924T1700Z-210925T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Riverside County Mountains-San Diego County Mountains-Coachella Valley-San Diego County Deserts- Including the cities of Palm Desert, Indio, La Quinta, Idyllwild-Pine Cove, Julian, Palm Desert Country, Pine Valley, Palm Springs, Coachella, Borrego Springs, and Cathedral City 856 AM PDT Fri Sep 24 2021 ...FLASH FLOOD WATCH IN EFFECT UNTIL 7 PM PDT THIS EVENING... The National Weather Service in San Diego has issued a * Flash Flood Watch for a portion of southwest California, including the following areas: Coachella Valley, Riverside County Mountains, San Diego County Deserts and San Diego County Mountains. * Until 7 PM PDT this evening. * Areas of showers and thunderstorms are expected across the region. Some of these will produce heavy rain that may lead to localized flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Turn around, don't drown! && $$ APR
1 follow-up statement
648 WGUS66 KSGX 250153 FFASGX Flood Watch National Weather Service San Diego CA 653 PM PDT Fri Sep 24 2021 CAZ056-058-061-062-250300- /O.EXP.KSGX.FF.A.0008.000000T0000Z-210925T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Riverside County Mountains-San Diego County Mountains-Coachella Valley-San Diego County Deserts- Including the cities of Palm Desert, Indio, La Quinta, Idyllwild-Pine Cove, Julian, Palm Desert Country, Pine Valley, Palm Springs, Coachella, Borrego Springs, and Cathedral City 653 PM PDT Fri Sep 24 2021 ...FLASH FLOOD WATCH WILL EXPIRE AT 7 PM PDT THIS EVENING... The Flash Flood Watch for the Coachella Valley, Riverside County Mountains, San Diego County Deserts and San Diego County Mountains will expire at 7 PM this evening. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ Moede
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 24, 11:08 AM PDT | Beach Hazards Statement | SGX | Orange, San Diego | 8 hr |
| Sep 24, 12:13 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 31 min |
| Sep 24, 12:21 PM PDT | Flash Flood Warning | SGX | San Diego | 56 min |
| Sep 24, 1:24 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 51 min |
| Sep 24, 1:28 PM PDT | Flash Flood Warning | SGX | San Diego | 2 hr |
| Sep 24, 2:09 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Sep 24, 2:41 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 64 min |
| Sep 24, 2:59 PM PDT | Special Weather Statement | SGX | San Diego | 61 min |
| Sep 24, 3:14 PM PDT | Special Marine Warning | SGX | 91 min | |
| Sep 24, 3:20 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 55 min |
| Sep 24, 3:47 PM PDT | Special Weather Statement | SGX | Orange | 58 min |
| Sep 24, 3:56 PM PDT | Special Marine Warning | SGX | 94 min | |
| Sep 24, 4:40 PM PDT | Special Marine Warning | SGX | 65 min |
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.