Alert archive / California / Flash Flood Warnings in 2007

Flash Flood Warning 7, NWS San Diego, CA

November 30, 2007San Bernardino County, California

NWS San Diego, CA issued this flash flood warning at Nov 30, 2007, 3:30 PM PST for San Bernardino 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: Nov 30, 2007, 3:30 PM PST (23:30 UTC)
Expired: Nov 30, 2007, 5:30 PM PST
In force: 2 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), 60 km from the middle of the area, began a volume at 23:33 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, 11.5 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1466 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS56 KSGX 302336
FFWSGX
CAC071-010130-
/O.NEW.KSGX.FF.W.0007.071130T2330Z-071201T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
330 PM PST FRI NOV 30 2007

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR AREAS IN AND CLOSE TO RECENT BURNS         
  IN THE SAN BERNARDINO MOUNTAINS INCLUDING THE GRASS VALLEY...      
  SLIDE...PINNACLES AND EMERALD BURN AREAS IN SOUTHWESTERN SAN       
  BERNARDINO COUNTY IN SOUTHEAST CALIFORNIA.

* UNTIL 530 PM PST

* AT 330 PM PST...RADAR AND REMOTE GAGES INDICATE RAINFALL CAPABLE   
  OF PRODUCING SIGNIFICANT DEBRIS FLOWS IS OCCURRING IN OR NEAR      
  THESE AREAS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LAKE   
ARROWHEAD AND CRESTLINE

IN ADDITION TO FLASH FLOODING...RAINFALL IS EXPECTED TO CAUSE DEBRIS 
FLOWS IN AND CLOSE TO RECENTLY BURNED AREAS ACCORDING TO THRESHOLDS 
PROVIDED BY THE USGS. 

THE WATERSHEDS BURNED BY THE EMERALD FIRE WILL MAKE PORTIONS OF THE
FOLLOWING ROADS...SUBJECT TO FLASH FLOODING AND DEBRIS FLOWS...STATE 
HIGHWAY 38/MILL CREEK ROAD...NEWPORT AVENUE...MORTON RIDGE TRAIL 
ROAD AND FISH HATCHERY ROAD.

THE WATERSHEDS BURNED BY THE PINNACLES FIRE WILL MAKE PORTIONS OF THE
FOLLOWING ROADS...SUBJECT TO FLASH FLOODING AND DEBRIS FLOWS...STATE
HIGHWAY 173 NORTH OF LAKE ARROWHEAD.

RESIDENTS AND MOTORISTS IN AND BELOW RECENTLY BURNED AREAS SHOULD BE
ALERT TO HEAVY MUD AND DEBRIS FLOWS WHICH MAY BLOCK ROADS AND
CULVERTS. POTENTIALLY DANGEROUS FLOODING AND PROPERTY LOSS COULD
RESULT IN AREAS WHERE RUNOFF IS RESTRICTED OR BLOCKED. ADDITIONAL 
RAINFALL AMOUNTS IN EXCESS OF ONE HALF INCH ARE POSSIBLE IN THE 
WARNED AREA.


LAT...LON 3430 11741 3429 11699 3418 11699 3417 11744
TIME...MOT...LOC 2330Z 180DEG 0KT 3424 11708

$$

MACKECHNIE

2 follow-up statements

000 
WGUS76 KSGX 010032
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
428 PM PST FRI NOV 30 2007

CAC071-010130-
/O.CON.KSGX.FF.W.0007.000000T0000Z-071201T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
428 PM PST FRI NOV 30 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM PST FOR
SOUTHWESTERN SAN BERNARDINO COUNTY...

WHILE RAINFALL RATES HAVE DECREASED THE PAST HOUR...RESIDUAL RUNOFF 
AND CONTINUED SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED TO 
CAUSE DEBRIS FLOWS IN AND CLOSE TO RECENTLY BURNED AREAS ACCORDING 
TO THRESHOLDS PROVIDED BY THE USGS. 

THE WATERSHEDS BURNED BY THE EMERALD FIRE WILL MAKE PORTIONS OF THE
FOLLOWING ROADS...SUBJECT TO FLASH FLOODING AND DEBRIS FLOWS...STATE 
HIGHWAY 38/MILL CREEK ROAD...NEWPORT AVENUE...MORTON RIDGE TRAIL 
ROAD AND FISH HATCHERY ROAD.

THE WATERSHEDS BURNED BY THE PINNACLES FIRE WILL MAKE PORTIONS OF THE
FOLLOWING ROADS...SUBJECT TO FLASH FLOODING AND DEBRIS FLOWS...STATE
HIGHWAY 173 NORTH OF LAKE ARROWHEAD.

RESIDENTS AND MOTORISTS IN AND BELOW RECENTLY BURNED AREAS SHOULD BE
ALERT TO HEAVY MUD AND DEBRIS FLOWS WHICH MAY BLOCK ROADS AND
CULVERTS. POTENTIALLY DANGEROUS FLOODING AND PROPERTY LOSS COULD
RESULT IN AREAS WHERE RUNOFF IS RESTRICTED OR BLOCKED. ADDITIONAL 
RAINFALL AMOUNTS IN EXCESS OF ONE HALF INCH ARE POSSIBLE IN THE 
WARNED AREA THROUGH 530 PM.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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 3430 11741 3429 11699 3418 11699 3417 11744
TIME...MOT...LOC 0028Z 180DEG 0KT 3424 11708

$$

ECC

000 
WGUS76 KSGX 010128
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
527 PM PST FRI NOV 30 2007

CAC071-010137-
/O.EXP.KSGX.FF.W.0007.000000T0000Z-071201T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
527 PM PST FRI NOV 30 2007

...THE FLASH FLOOD WARNING WILL EXPIRE AT 530 PM PST FOR SOUTHWESTERN
SAN BERNARDINO COUNTY...

RAINFALL RATES HAVE DECREASED OVER THE AREA THEREFORE THE FLASH 
FLOOD WARNING WILL BE ALLOWED TO EXPIRE. 

LAT...LON 3430 11741 3429 11699 3418 11699 3417 11744
TIME...MOT...LOC 0127Z 180DEG 0KT 3424 11708

$$

ECC

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 30, 7:45 AM PST	Flash Flood Watch	SGX	Orange, Riverside, San Bernardino, San Diego	19 hr
Nov 30, 9:39 AM PST	Flash Flood Warning	SGX	San Diego	2 hr
Nov 30, 11:55 AM PST	Flash Flood Warning	SGX	San Diego	2 hr
Nov 30, 12:47 PM PST	Flash Flood Warning	SGX	San Diego	118 min
Nov 30, 1:10 PM PST	Flash Flood Warning	SGX	Orange	2 hr
Nov 30, 1:34 PM PST	Flash Flood Warning	SGX	San Bernardino	116 min

Nearby

Flash Flood Warnings in California, 2007 Every flash flood warning in 2007

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.