Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 27, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 19, 2012, 3:52 PM PDT for Riverside 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
- Aug 19, 2012, 3:52 PM PDT (22:52 UTC)
- Expired
- Aug 19, 2012, 6:20 PM PDT
- In force
- 2 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Riverside County, CA
The radar
The San Diego radar (KNKX), 98 km from the middle of the area, began a volume at 22:54 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, 10.9 hours before the alert went out and 117 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
- 1473 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- -18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
285
WGUS56 KSGX 192252
FFWSGX
CAC065-200145-
/O.NEW.KSGX.FF.W.0027.120819T2252Z-120820T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
352 PM PDT SUN AUG 19 2012
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 645 PM PDT
* AT 342 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
FLASH FLOODING FROM A STORM NEAR SANTA ROSA MOUNTAIN.
* AREAS IMPACTED INCLUDE THE SANTA ROSA INDIAN RESERVATION...
NIGHTINGALE...PALM CANYON CREEK...DEEP CREEK...AND STATE ROUTE 74.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF
SMALL CREEKS...STREAMS...AND RURAL ROADS.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
LAT...LON 3370 11640 3363 11631 3353 11646 3354 11662
3372 11663 3383 11655
$$
JAD3 follow-up statements
111
WGUS76 KSGX 192321
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
421 PM PDT SUN AUG 19 2012
CAC065-200145-
/O.CON.KSGX.FF.W.0027.000000T0000Z-120820T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-
421 PM PDT SUN AUG 19 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM PDT FOR
CENTRAL RIVERSIDE COUNTY...
AT 406 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A STRONG THUNDERSTORM WITH HEAVY RAIN CAPABLE OF PRODUCING
FLASH FLOODING JUST NORTH OF SANTA ROSA MOUNTAIN.
THIS STORM WAS OVER THE HEADWATERS OF PALM CANYON CREEK AND DEEP
CREEK AND WAS MOVING VERY SLOWLY.
CAMPERS AND HIKERS IN THESE AREAS SHOULD MOVE TO HIGHER GROUND
IMMEDIATELY. RUNOFF FROM THIS STORM IS EXPECTED RUN THROUGH PALM
CANYON CREEK...DEEP CREEK...AND ASSOCIATED TRIBUTARIES AND WASHES
THROUGH THE FOOTHILLS WEST OF PALM SPRINGS...AND PALM DESERT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
IN HILLY TERRAIN THERE ARE LOW WATER CROSSINGS WHICH ARE POTENTIALLY
DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED
ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF SWIFTLY
FLOWING WATER TO CARRY VEHICLES AWAY.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
LAT...LON 3370 11640 3363 11631 3353 11646 3354 11662
3372 11663 3383 11655
$$
JAD234
WGUS76 KSGX 200046
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
546 PM PDT SUN AUG 19 2012
CAC065-200145-
/O.CON.KSGX.FF.W.0027.000000T0000Z-120820T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-
546 PM PDT SUN AUG 19 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM PDT FOR
CENTRAL RIVERSIDE COUNTY...
THE THUNDERSTORM RESPONSIBLE FOR HEAVY RAINFALL IN THE SANTA ROSA
MOUNTAINS HAS DISSIPATED. HOWEVER WATER IS LIKELY STILL FLOWING
THROUGH THE PALM CANYON CREEK AND DEEP CANYON WASHES.
A REMOTE RAIN GAGE NEAR THE STORM REPORTED JUST OVER THREE QUARTERS
OF AN INCH BY 5 PM THIS EVENING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...RURAL ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
&&
LAT...LON 3370 11640 3363 11631 3353 11646 3354 11662
3372 11663 3383 11655
$$
JAD715
WGUS76 KSGX 200120
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
620 PM PDT SUN AUG 19 2012
CAC065-200122-
/O.CAN.KSGX.FF.W.0027.000000T0000Z-120820T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-
620 PM PDT SUN AUG 19 2012
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL RIVERSIDE
COUNTY...
RAINFALL ENDED AROUND 445 PM THIS AFTERNOON AND NO FURTHER
THUNDERSTORM ACTIVITY IS EXPECTED.
SOME RUNOFF AMY CONTINUE THROUGH THE LOWER REACHES OF PALM CREEK
CANYON AND DEEP CANYON CREEKS FOR SEVERAL HOURS...BUT THE THREAT OF
A DAMAGING FLASH FLOOD HAS DIMINISHED.
BASED ON LIMITED RAINFALL REPORTS...A LARGE PORTION OF THE UPPER
WATERSHEDS OF THESE CREEKS BETWEEN MOUNTAIN CENTER AND SANTA ROSA
PEAK RECEIVED BETWEEN ONE-HALF AND ON-INCH OF RAIN BETWEEN 3 AND 5
PM THIS AFTERNOON.
LAT...LON 3370 11640 3363 11631 3353 11646 3354 11662
3372 11663 3383 11655
$$
JADThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 3:14 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 91 min |
Nearby
Flash Flood Warnings in California, 2012Every flash flood warning in 2012
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.