Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 5, NWS San Diego, CA

January 6, 2016Orange County, California

NWS San Diego, CA issued this flash flood warning at Jan 6, 2016, 12:10 PM PST for Orange County, California. It was in force for 5 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
Jan 6, 2016, 12:10 PM PST (20:10 UTC)
Expired
Jan 6, 2016, 5:15 PM PST
In force
5 hr
Issued by
NWS San Diego, CA
Area
Storm-based polygon
Flood severity
None

County Orange County, CA

The radar

The Santa Ana Mts radar (KSOX), 8 km from the middle of the area, began a volume at 20:13 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, 8.2 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.

Skew-T log-pSkew-T log-p diagram, San Diego, CA at 12:00Z on 2016-01-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2016-01-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
17 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
791 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
150 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

431 
WGUS56 KSGX 062010
FFWSGX
CAC059-070115-
/O.NEW.KSGX.FF.W.0005.160106T2010Z-160107T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
1210 PM PST WED JAN 6 2016

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN ORANGE COUNTY IN SOUTHWESTERN CALIFORNIA...

* UNTIL 515 PM PST

* AT 1210 PM PST...DOPPLER RADAR INDICATED HEAVY RAIN ACROSS THE
  SILVERADO CANYON AREA. FLASH FLOODING WILL LIKELY BEGIN SHORTLY.
  IN ADDITION...EXCESSIVE RAINFALL WILL LIKELY RESULT IN DEBRIS
  FLOWS WITHIN AND DOWNSTREAM OF THE 2014 SILVERADO FIRE BURN SCAR.
  THE DEBRIS FLOW CAN CONSIST OF ROCK...MUD...VEGETATION AND OTHER
  LOOSE MATERIALS. SILVERADO CANYON...INCLUDING HOMES AND BUSINESSES
  IN AND AROUND SILVERADO CANYON ROAD...WILL LIKELY BE IMPACTED.
  THIS IS A DANGEROUS SITUATION FOR SILVERADO CANYON RESIDENTS...AND
  IMMEDIATE MEASURES SHOULD BE TAKEN TO PROTECT LIFE AND PROPERTY.

* SOME LOCATIONS THAT WILL LIKELY EXPERIENCE FLOODING INCLUDE...
  EASTERN SILVERADO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

&&

LAT...LON 3376 11756 3372 11757 3373 11762 3375 11764
      3377 11761 3377 11759

$$

HARRISON
1 follow-up statement
653 
WGUS76 KSGX 070124
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
524 PM PST WED JAN 6 2016

CAC059-070125-
/O.EXP.KSGX.FF.W.0005.000000T0000Z-160107T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ORANGE CA-
524 PM PST WED JAN 6 2016

...THE FLASH FLOOD WARNING FOR NORTHEASTERN ORANGE COUNTY HAS
EXPIRED...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT. PLEASE CONTINUE TO HEED ALL ROAD CLOSURES.

DEBRIS FLOWS WITH UP TO 2 FEET OF MUD WERE REPORTED AT THE UPPER END
OF SILVERADO CANYON.

HOWEVER...ADDITIONAL HEAVY RAIN IS EXPECTED TO DEVELOP BETWEEN 6 AND
8 PM THIS EVENING AN ANOTHER FLASH FLOOD WARNING MAY BE NEEDED.

LAT...LON 3376 11756 3372 11757 3373 11762 3375 11764
      3377 11761 3377 11759

$$

TARDY

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 5, 4:11 PM PSTFlash Flood WarningSGXSan Diego3 hr
Jan 5, 6:46 PM PSTAreal Flood AdvisorySGXRiverside, San Diego4 hr
Jan 5, 8:28 PM PSTRiver Flood WarningSGXSan Diego9 hr
Jan 6, 4:05 AM PSTWind AdvisorySGXOrange, San Diego14 hr
Jan 6, 4:28 AM PSTFlash Flood WatchSGXOrange, Riverside, San Bernardino, San Diego32 hr
Jan 6, 10:36 AM PSTBeach Hazards StatementSGXOrange, San Diego15 hr
Jan 6, 10:36 AM PSTHigh Surf WarningSGXOrange, San Diego59 hr
Jan 6, 12:00 PM PSTRiver Flood WarningSGXSan Diego29 hr
Jan 6, 12:35 PM PSTSpecial Marine WarningSGX55 min
Jan 6, 12:40 PM PSTAreal Flood WarningSGXOrange, Riverside, San Bernardino6 hr
Jan 6, 12:45 PM PSTSpecial Marine WarningSGX45 min
Jan 6, 12:46 PM PSTSevere Thunderstorm WarningSGXOrange, Riverside, San Bernardino44 min
Jan 6, 1:04 PM PSTSevere Thunderstorm WarningSGXOrange, Riverside, San Diego56 min
Jan 6, 1:23 PM PSTSpecial Marine WarningSGX37 min
Jan 6, 1:30 PM PSTSpecial Marine WarningSGX45 min
Jan 6, 1:34 PM PSTFlash Flood WarningSGXOrange, Riverside, San Bernardino, San Diego3 hr
Jan 6, 1:50 PM PSTSpecial Marine WarningSGX40 min
Jan 6, 2:09 PM PSTSpecial Marine WarningSGX96 min
Jan 6, 2:23 PM PSTSevere Thunderstorm WarningSGXSan Diego52 min
Jan 6, 2:45 PM PSTSpecial Marine WarningSGX60 min
Jan 6, 2:54 PM PSTTornado WarningSGXSan Diego20 min
Jan 6, 2:56 PM PSTTornado WarningSGXSan Diego19 min
Jan 6, 3:12 PM PSTFlash Flood WarningSGXSan Diego3 hr
Jan 6, 3:19 PM PSTSevere Thunderstorm WarningSGXSan Diego43 min
Jan 6, 3:50 PM PSTSpecial Marine WarningSGX85 min

Nearby

Flash Flood Warnings in California, 2016Every flash flood warning in 2016

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.