Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 7, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Jul 30, 2021, 2:38 PM PDT for Riverside County, San Diego County, California. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 30, 2021, 2:38 PM PDT (21:38 UTC)
- Expired
- Jul 30, 2021, 5:00 PM PDT
- In force
- 2 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Riverside County, CA, San Diego County, CA
The radar
The San Diego radar (KNKX), 64 km from the middle of the area, began a volume at 21:39 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, 9.6 hours before the alert went out and 81 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
- 2147 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
121
WGUS56 KSGX 302138
FFWSGX
CAC065-073-310000-
/O.NEW.KSGX.FF.W.0007.210730T2138Z-210731T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
238 PM PDT Fri Jul 30 2021
The National Weather Service in San Diego has issued a
* Flash Flood Warning for...
Riverside County in southern California...
North Central San Diego County in southwestern California...
* Until 500 PM PDT.
* At 238 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Additional rainfall amounts of
1 to 1.5 inches are possible in the warned area. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Temecula, Anza, Hemet, Aguanga, Hwy 79 Between Oak Grove And
Aguanga, Palomar Mountain, Palomar Mountain State Park, Hwy 79
Between Warner Springs And Oak Grove, S7 - East Grade Rd, Oak
Grove, Sage, Cahuilla Indian Reservation, Pauma Valley, La Jolla
Indian Reservation, Lake Skinner Recreation Area and Winchester.
This includes the following streams and drainages...
Doane Creek, Seco Creek, Arroyo, Cedar Creek, Harrison Canyon, San
Luis Rey River, Temecula Creek, Chihuahua Creek, Pauma Creek, West
Fork San Luis Rey River, Yuima Creek, Long Canyon, Kohler Canyon,
French Creek, Iron Spring Canyon, Potrero Creek, Cooper Canyon,
Lion Creek, Bear Canyon, Cow Canyon and Iron Springs Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3345 11696 3348 11698 3368 11710 3364 11671
3343 11663 3339 11662 3326 11691
FLASH FLOOD...RADAR INDICATED
$$
Small2 follow-up statements
062
WGUS76 KSGX 302243
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
343 PM PDT Fri Jul 30 2021
CAC065-073-310000-
/O.CON.KSGX.FF.W.0007.000000T0000Z-210731T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-San Diego CA-
343 PM PDT Fri Jul 30 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM PDT THIS
AFTERNOON FOR RIVERSIDE AND NORTH CENTRAL SAN DIEGO COUNTIES...
At 343 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Additional rainfall amounts of 0.5 to 1
inch are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Temecula, Anza, Hemet, Aguanga, Hwy 79 Between Oak Grove And
Aguanga, Palomar Mountain, Palomar Mountain State Park, Hwy 79
Between Warner Springs And Oak Grove, S7 - East Grade Rd, Oak
Grove, Sage, Cahuilla Indian Reservation, Pauma Valley, La Jolla
Indian Reservation, Lake Skinner Recreation Area and Winchester.
This includes the following streams and drainages...
Doane Creek, Seco Creek, Arroyo, Cedar Creek, Harrison Canyon, San
Luis Rey River, Temecula Creek, Chihuahua Creek, Pauma Creek, West
Fork San Luis Rey River, Yuima Creek, Long Canyon, Kohler Canyon,
French Creek, Iron Spring Canyon, Potrero Creek, Cooper Canyon,
Lion Creek, Bear Canyon, Cow Canyon and Iron Springs Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3345 11696 3348 11698 3368 11710 3364 11671
3343 11663 3339 11662 3326 11691
FLASH FLOOD...RADAR INDICATED
$$
Small797
WGUS76 KSGX 302355
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
455 PM PDT Fri Jul 30 2021
CAC065-073-310005-
/O.EXP.KSGX.FF.W.0007.000000T0000Z-210731T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-San Diego CA-
455 PM PDT Fri Jul 30 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 5 PM PDT THIS AFTERNOON FOR
RIVERSIDE AND NORTH CENTRAL SAN DIEGO COUNTIES...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 3345 11696 3348 11698 3368 11710 3364 11671
3343 11663 3339 11662 3326 11691
$$
SmallThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 1:41 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 4 hr |
| Jul 30, 2:48 PM PDT | Areal Flood Advisory | SGX | Riverside | 3 hr |
| Jul 30, 2:54 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 3 hr |
| Jul 30, 3:17 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 58 min |
| Jul 30, 3:48 PM PDT | Flash Flood Warning | SGX | Riverside | 3 hr |
Nearby
Flash Flood Warnings in California, 2021Every flash flood warning 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.