Alert archive / California / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS San Diego, CA

July 6, 2011San Diego County, California

NWS San Diego, CA issued this flash flood warning at Jul 6, 2011, 12:55 PM PDT for San Diego County, California. It was in force for 50 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 6, 2011, 12:55 PM PDT (19:55 UTC)
Expired: Jul 6, 2011, 1:45 PM PDT
In force: 50 min
Issued by: NWS San Diego, CA
Area: Storm-based polygon
Flood severity: None

County San Diego County, CA

The radar

The San Diego radar (KNKX), 55 km from the middle of the area, began a volume at 19:58 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.

What was reported inside it

Time	Report	Where	Remark
Jul 6, 1:45 PM PDT	HEAVY RAIN 0	Warner Springs, CA	REPORTS OF 1 TO 2 INCHES WATER ON ROAD BUT NO SIGNIFICANT FLOODING ON HIGHWAY 79.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

San Diego, CA (KNKX), launched 12:00Z, 7.9 hours before the alert went out and 75 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: 27 J/kg
Mixed-layer CIN: -481 J/kg
Mixed-layer LCL: 924 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 48 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.

089 
WGUS56 KSGX 061955
FFWSGX
CAC073-062045-
/O.NEW.KSGX.FF.W.0003.110706T1955Z-110706T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
1255 PM PDT WED JUL 6 2011

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA...

* UNTIL 145 PM PDT

* AT 1248 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR            
  INDICATED AN INTENSE STORM NEAR WARNER SPRINGS...OR 15 MILES WEST  
  OF BORREGO SPRINGS...MOVING NORTH AT 5 MPH.

* THE VERY SLOW...ALMOST STATIONARY...NATURE OF THIS STORM WILL      
  RESULT IN VERY HEAVY RAIN OVER THE SAME LOCATION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

IN HILLY TERRAIN THERE ARE HUNDREDS OF 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.

&&

LAT...LON 3336 11676 3339 11653 3319 11649 3315 11670

$$

TS

1 follow-up statement

750 
WGUS76 KSGX 062038
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
138 PM PDT WED JUL 6 2011

CAC073-062046-
/O.EXP.KSGX.FF.W.0003.000000T0000Z-110706T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
138 PM PDT WED JUL 6 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 145 PM PDT FOR NORTH
CENTRAL SAN DIEGO COUNTY...

THIS FLASH FLOOD WARNING HAS BEEN ISSUED TO REFLECT THE NORTHWARD 
STORM MOVEMENT AND EXPANDED WARNED AREA. 

LAT...LON 3336 11676 3339 11653 3319 11649 3315 11670

$$

TS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 5:12 PM PDT	Severe Thunderstorm Warning	SGX	San Diego	48 min
Jul 6, 12:14 PM PDT	Special Weather Statement	SGX	San Diego	61 min
Jul 6, 12:52 PM PDT	Flash Flood Warning	SGX	San Bernardino	100 min
Jul 6, 1:01 PM PDT	Flash Flood Watch	SGX	Riverside, San Bernardino, San Diego	7 hr
Jul 6, 1:15 PM PDT	Severe Thunderstorm Warning	SGX	San Bernardino	45 min
Jul 6, 1:31 PM PDT	Flash Flood Warning	SGX	Riverside, San Diego	59 min
Jul 6, 1:48 PM PDT	Flash Flood Warning	SGX	San Bernardino	87 min
Jul 6, 2:48 PM PDT	Severe Thunderstorm Warning	SGX	Riverside	42 min
Jul 6, 2:56 PM PDT	Areal Flood Advisory	SGX	Riverside, San Bernardino	2 hr
Jul 6, 4:00 PM PDT	Areal Flood Advisory	SGX	Riverside, San Bernardino	90 min
Jul 6, 4:27 PM PDT	Special Weather Statement	SGX	San Diego	63 min

Nearby

Flash Flood Warnings in California, 2011 Every flash flood warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.