Alert archive / California / Flash Flood Warnings in 2015
Flash Flood Warning 2, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Mar 2, 2015, 11:00 AM PST for Orange County, 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
- Mar 2, 2015, 11:00 AM PST (19:00 UTC)
- Expired
- Mar 2, 2015, 1:00 PM PST
- In force
- 2 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Orange County, CA, Riverside County, CA
The radar
The Santa Ana Mts radar (KSOX), 8 km from the middle of the area, began a volume at 18:59 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, 7.0 hours before the alert went out and 112 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
- 30 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 572 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
021 WGUS56 KSGX 021900 FFWSGX CAC059-065-022100- /O.NEW.KSGX.FF.W.0002.150302T1900Z-150302T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN DIEGO CA 1100 AM PST MON MAR 2 2015 THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHEASTERN ORANGE COUNTY IN SOUTHWESTERN CALIFORNIA... WESTERN RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA... * UNTIL 100 PM PST * AT 1054 AM PST...DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED THAT HEAVY RAIN WAS APPROACHING THE AREA. RAINFALL RATES OF ONE HALF INCH IN 30 MINUTES HAVE BEEN OBSERVED MOVING TOWARD THE BURN SCAR. FLASH FLOODING MAY BEGIN SHORTLY. EXCESSIVE RAINFALL OVER THE BURN SCAR WILL RESULT IN DEBRIS FLOW MOVING THROUGH SILVERADO CANYON. THE DEBRIS FLOW CAN CONSIST OF ROCK...MUD...VEGETATION AND OTHER LOOSE MATERIALS. FLASH FLOODS AND DEBRIS FLOWS ARE LIKELY TO OCCUR IN THE SILVERADO CANYON AREA DUE TO HEAVY RAIN FALLING OVER THE SILVERADO FIRE BURN SCAR. THIS INCLUDES HOMES AND BUSINESSES IN AND AROUND SILVERADO CANYON ROAD. THIS IS A DANGEROUS SITUATION FOR SILVERADO CANYON RESIDENTS...AND IMMEDIATE MEASURES SHOULD BE TAKEN TO PROTECT LIFE AND PROPERTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... MUD SLIDES AND DEBREE FLOWS EXPECTED. TAKE APPROPRIATE ACTION. && LAT...LON 3376 11757 3375 11757 3372 11763 3378 11759 $$ JT
1 follow-up statement
404 WGUS76 KSGX 022058 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 1258 PM PST MON MAR 2 2015 CAC059-022105- /O.EXP.KSGX.FF.W.0002.000000T0000Z-150302T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ORANGE CA- 1258 PM PST MON MAR 2 2015 ...THE FLASH FLOOD WARNING FOR NORTHEASTERN ORANGE COUNTY WILL EXPIRE AT 100 PM PST... THE HEAVY RAIN HAS ENDED OVER THE SILVERADO BURN SCAR AND FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. LAT...LON 3376 11757 3375 11757 3372 11763 3377 11759 $$ JT
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 1, 6:58 PM PST | Special Marine Warning | SGX | 47 min | |
| Mar 2, 4:29 AM PST | Flash Flood Warning | SGX | Orange | 3 hr |
| Mar 2, 7:40 AM PST | Beach Hazards Statement | SGX | Orange, San Diego | 9 hr |
| Mar 2, 10:28 AM PST | Special Weather Statement | SGX | Orange | 32 min |
Nearby
Flash Flood Warnings in California, 2015Every flash flood warning in 2015
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.