Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 4, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Jul 6, 2011, 1:31 PM PDT for Riverside County, San Diego County, California. It was in force for 59 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, 1:31 PM PDT (20:31 UTC)
- Expired
- Jul 6, 2011, 2:30 PM PDT
- In force
- 59 min
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Riverside County, CA, San Diego County, CA
The radar
The San Diego radar (KNKX), 60 km from the middle of the area, began a volume at 20:33 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.
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, 8.5 hours before the alert went out and 79 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
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
807 WGUS56 KSGX 062031 FFWSGX CAC065-073-062130- /O.NEW.KSGX.FF.W.0004.110706T2031Z-110706T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN DIEGO CA 131 PM PDT WED JUL 6 2011 THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A * FLASH FLOOD WARNING FOR... EXTREME SOUTH CENTRAL RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA... NORTH CENTRAL SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA... * UNTIL 230 PM PDT * AT 118 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A STORM NORTH OF WARNER SPRINGS...JUST EAST OF PALOMAR MOUNTAIN AND OAK GROVE...MOVING NORTH AT 5 MPH. * THE NEARLY STATIONARY MOVEMENT COUPLED WITH HEAVY RAIN INDICATES A HIGH PROBABILITY FOR FLASH FLOODING. 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 3346 11685 3351 11655 3325 11650 3320 11679 $$ TS
3 follow-up statements
173 WGUS76 KSGX 062059 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 159 PM PDT WED JUL 6 2011 CAC065-073-062130- /O.CON.KSGX.FF.W.0004.000000T0000Z-110706T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN DIEGO CA-RIVERSIDE CA- 159 PM PDT WED JUL 6 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM PDT FOR EXTREME SOUTH CENTRAL RIVERSIDE AND NORTH CENTRAL SAN DIEGO COUNTIES... AT 156 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE STORMS PRODUCING HEAVY RAIN. THIS STORM WAS LOCATED NEAR OAK GROVE...MOVING NORTH AT 5 MPH. THESE THUNDERSTORMS ARE BEGINNING TO WEAKEN AND RECOMBINE OUTSIDE THE WARNED AREA...HOWEVER RUNOFF AND CONTINUED RAIN WILL KEEP THE THREAT FOR FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 3346 11685 3351 11655 3325 11650 3320 11679 $$ TS
563 WGUS76 KSGX 062123 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 223 PM PDT WED JUL 6 2011 CAC065-073-062130- /O.CON.KSGX.FF.W.0004.000000T0000Z-110706T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN DIEGO CA-RIVERSIDE CA- 223 PM PDT WED JUL 6 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM PDT FOR EXTREME SOUTH CENTRAL RIVERSIDE AND NORTH CENTRAL SAN DIEGO COUNTIES... AT 218 PM PDT...THUNDERSTORMS HAVE WEAKENED OVER THE HIGH TERRAIN BUT LIGHT TO MODERATE RAIN CONTINUES. THE THREAT FOR FLASH FLOODING HAS DIMINISHED. LAT...LON 3346 11685 3351 11655 3325 11650 3320 11679 $$ TARDY
874 WGUS76 KSGX 062136 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 236 PM PDT WED JUL 6 2011 CAC065-073-062145- /O.EXP.KSGX.FF.W.0004.000000T0000Z-110706T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN DIEGO CA-RIVERSIDE CA- 236 PM PDT WED JUL 6 2011 ...THE FLASH FLOOD WARNING HAS EXPIRED FOR EXTREME SOUTH CENTRAL RIVERSIDE AND NORTH CENTRAL SAN DIEGO COUNTIES... THE RAINFALL HAS DIMINISHED IN INTENSITY SINCE 130 PM. HOWEVER...SOME LOW LYING AREAS MAY STILL HAVE WATER OVER THE ROADWAYS. LAT...LON 3346 11685 3351 11655 3325 11650 3320 11679 $$ MAXWELL
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, 12:55 PM PDT | Flash Flood Warning | SGX | San Diego | 50 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, 1:48 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, 2011Every 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.