Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 19, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 31, 2017, 3:58 PM PDT for Riverside County, San Bernardino County, California. It was in force for 3 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 31, 2017, 3:58 PM PDT (22:58 UTC)
- Expired
- Aug 31, 2017, 7:00 PM PDT
- In force
- 3 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
The radar
The Santa Ana Mts radar (KSOX), 36 km from the middle of the area, began a volume at 22:58 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 31, 4:41 PM PDT | FLOOD | Glen Avon, CA | #3 AND #4 LANES OF HIGHWAY 60 FLOODED WITH APPROXIMATELY 1 FOOT OF WATER. |
| Aug 31, 4:45 PM PDT | FLOOD | 2 Sw Highgrove, CA | FLOODING AND STALLED VEHICLES ALONG 215 AND 60 FREEWAYS IN RIVERSIDE DUE TO HEAVY RAIN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 11.0 hours before the alert went out and 143 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
- 123 J/kg
- Mixed-layer CIN
- -747 J/kg
- Mixed-layer LCL
- 2464 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
642
WGUS56 KSGX 312258
FFWSGX
CAC065-071-010200-
/O.NEW.KSGX.FF.W.0019.170831T2258Z-170901T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
358 PM PDT THU AUG 31 2017
The National Weather Service in San Diego has issued a
* Flash Flood Warning for...
San Bernardino County in southern California...
Riverside County in southern California...
* Until 700 PM PDT
* At 357 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding will likely begin
shortly.
* Some locations that will likely experience flooding include...
Riverside, San Bernardino, Fontana, Rialto, Rancho Cucamonga,
Colton, Muscoy, Pedley, Rubidoux, Grand Terrace, Glen Avon and
Highgrove.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3416 11733 3399 11729 3389 11739 3394 11750
3415 11755 3423 11743
$$
JJT3 follow-up statements
774
WGUS76 KSGX 312319
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
419 PM PDT THU AUG 31 2017
CAC065-071-010200-
/O.CON.KSGX.FF.W.0019.000000T0000Z-170901T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-Riverside CA-
419 PM PDT THU AUG 31 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM PDT FOR SAN
BERNARDINO AND RIVERSIDE COUNTIES...
At 417 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Storm total radar precipitation
estimates are between 0.50 to 1.50 inches in the past 90 minutes.
Flash flooding will likely begin shortly if not already occurring.
Some locations that will likely experience flooding include...
Riverside, San Bernardino, Fontana, Rialto, Rancho Cucamonga, Colton,
Muscoy, Pedley, Rubidoux, Grand Terrace, Glen Avon and Highgrove.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3416 11733 3399 11729 3389 11739 3394 11750
3415 11755 3423 11743
$$
JJT542
WGUS76 KSGX 010047
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
547 PM PDT THU AUG 31 2017
CAC065-071-010200-
/O.CON.KSGX.FF.W.0019.000000T0000Z-170901T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-Riverside CA-
547 PM PDT THU AUG 31 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM PDT FOR SAN
BERNARDINO AND RIVERSIDE COUNTIES...
At 546 PM PDT, Doppler radar indicated thunderstorms were weakening
over the area. However...flash flooding will remain possible through
7 pm.
Some locations that will likely experience flooding include...
Riverside, San Bernardino, Fontana, Rialto, Rancho Cucamonga, Colton,
Muscoy, Pedley, Rubidoux, Grand Terrace, Glen Avon and Highgrove.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3416 11733 3399 11729 3389 11739 3394 11750
3415 11755 3423 11743
$$
JJT411
WGUS76 KSGX 010154
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
654 PM PDT THU AUG 31 2017
CAC065-071-010200-
/O.EXP.KSGX.FF.W.0019.000000T0000Z-170901T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-Riverside CA-
654 PM PDT THU AUG 31 2017
...THE FLASH FLOOD WARNING FOR SAN BERNARDINO AND RIVERSIDE COUNTIES
WILL EXPIRE AT 700 PM PDT...
The heavy rain has ended. Flooding is no longer expected to pose a
threat.
LAT...LON 3416 11733 3399 11729 3389 11739 3394 11750
3415 11755 3423 11743
$$
MaxwellThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 1:38 PM PDT | Areal Flood Advisory | SGX | San Diego | 3 hr |
| Aug 31, 2:11 PM PDT | Areal Flood Advisory | SGX | Riverside | 3 hr |
| Aug 31, 2:25 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 65 min |
| Aug 31, 3:04 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 56 min |
| Aug 31, 3:35 PM PDT | Severe Thunderstorm Warning | SGX | Riverside, San Bernardino | 55 min |
| Aug 31, 3:36 PM PDT | Areal Flood Advisory | SGX | Orange, Riverside, San Bernardino | 3 hr |
Nearby
Flash Flood Warnings in California, 2017Every flash flood warning in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.