Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 8, NWS San Diego, CA

January 31, 2016San Bernardino County, California

NWS San Diego, CA issued this flash flood warning at Jan 31, 2016, 1:59 PM PST for San Bernardino County, California. It was in force for 3 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 31, 2016, 1:59 PM PST (21:59 UTC)
Expired
Jan 31, 2016, 5:00 PM PST
In force
3 hr
Issued by
NWS San Diego, CA
Area
Storm-based polygon
Flood severity
None

County San Bernardino County, CA

The radar

The Santa Ana Mts radar (KSOX), 57 km from the middle of the area, began a volume at 21:59 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, 10.0 hours before the alert went out and 161 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 2016-01-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 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 2016-01-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.1939587897117136Sfc1 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
2 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
482 m above ground
0-6 km bulk shear
86 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

540 
WGUS56 KSGX 312159
FFWSGX
CAC071-010100-
/O.NEW.KSGX.FF.W.0008.160131T2159Z-160201T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
159 PM PST SUN JAN 31 2016

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...

* UNTIL 500 PM PST
    
* AT 158 PM PST...DOPPLER RADAR INDICATED SHOWERS AND THUNDERSTORMS
  PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF
  RAIN HAVE ALREADY FALLEN. ADDITIONAL RAINFALL OF ONE INCH LIKELY.
  FLASH FLOODING WILL LIKELY BEGIN SHORTLY. EXCESSIVE RAINFALL OVER
  THE WARNED AREA WILL CAUSE MUD SLIDES NEAR STEEP TERRAIN. THE MUD
  SLIDE CAN CONSIST OF ROCK...MUD...VEGETATION AND OTHER LOOSE
  MATERIALS.

* SOME LOCATIONS THAT WILL LIKELY EXPERIENCE FLOODING INCLUDE...
  SAN BERNARDINO...FONTANA...RIALTO...HESPERIA...APPLE VALLEY...
  REDLANDS...WRIGHTWOOD...HWY 2 BETWEEN PHELAN AND WRIGHTWOOD...I-15
  THROUGH THE CAJON PASS AND LAKE ARROWHEAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3444 11707 3410 11700 3405 11706 3408 11718
      3413 11731 3411 11770 3429 11764 3438 11765
      3448 11730

$$

JMB
2 follow-up statements
071 
WGUS76 KSGX 312258
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
258 PM PST SUN JAN 31 2016

CAC071-010100-
/O.CON.KSGX.FF.W.0008.000000T0000Z-160201T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
258 PM PST SUN JAN 31 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM PST FOR SAN
BERNARDINO COUNTY...

AT 256 PM PST...DOPPLER RADAR INDICATED HEAVY RAIN ACROSS THE WARNED
AREA. UP TO TWO AND A HALF INCHES OF RAIN HAVE ALREADY FALLEN. FLASH
FLOODING COULD BEGIN AT ANY TIME.

EXCESSIVE RAINFALL OVER THE WARNED AREA COULD CAUSE MUD SLIDES NEAR
STEEP TERRAIN. THE MUD SLIDES CAN CONSIST OF ROCK...MUD...VEGETATION
AND OTHER LOOSE MATERIALS.

SOME LOCATIONS THAT WILL LIKELY EXPERIENCE FLOODING INCLUDE...
SAN BERNARDINO...FONTANA...RIALTO...HESPERIA...APPLE VALLEY...
REDLANDS...WRIGHTWOOD...HWY 2 BETWEEN PHELAN AND WRIGHTWOOD...I-15
THROUGH THE CAJON PASS AND LAKE ARROWHEAD.

RAINFALL IS BEGINNNG TO DECREASE SOMEWHAT...ALTHOUGH ADDITIONAL
RAINFALL AMOUNTS OF ONE HALF TO THREE-QUARTERS OF AN INCH ARE
POSSIBLE IN THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3444 11707 3410 11700 3405 11706 3408 11718
      3413 11731 3411 11770 3429 11764 3438 11765
      3448 11730

$$

TS
523 
WGUS76 KSGX 010101
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
501 PM PST SUN JAN 31 2016

CAC071-010111-
/O.EXP.KSGX.FF.W.0008.000000T0000Z-160201T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
501 PM PST SUN JAN 31 2016

...THE FLASH FLOOD WARNING FOR SAN BERNARDINO COUNTY HAS EXPIRED...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO
POSE A THREAT. WATER WILL BE SLOW TO RECEDE AND SOME LOW WATER
CROSSINGS MAY STILL BE FLOODED THIS EVENING.

LAT...LON 3444 11707 3410 11700 3405 11706 3408 11718
      3413 11731 3411 11770 3429 11764 3438 11765
      3448 11730

$$

JMB

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 30, 9:49 PM PSTGale WarningSGX44 hr
Jan 30, 9:58 PM PSTHigh Surf AdvisorySGXOrange, San Diego51 hr
Jan 31, 12:43 PM PSTAreal Flood AdvisorySGXSan Bernardino3 hr
Jan 31, 1:38 PM PSTSevere Thunderstorm WarningSGXOrange82 min
Jan 31, 1:42 PM PSTSpecial Marine WarningSGX63 min
Jan 31, 1:48 PM PSTSevere Thunderstorm WarningSGXRiverside, San Diego87 min
Jan 31, 3:22 PM PSTSevere Thunderstorm WarningSGXSan Diego83 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.