Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 42, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Sep 10, 2012, 2:42 PM PDT for San Diego County, California. It was in force for 93 min. 3 reports 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
- Sep 10, 2012, 2:42 PM PDT (21:42 UTC)
- Expired
- Sep 10, 2012, 4:15 PM PDT
- In force
- 93 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), 40 km from the middle of the area, began a volume at 21:45 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 |
|---|---|---|---|
| Sep 10, 3:00 PM PDT | HEAVY RAIN 1.46 | 5 Ssw Palomar Mountain, CA | EASTERN TANKS AT LA JOLLA AMAGO...BETWEEN 1411-1500 PDT...REPORTED 1.46 INCHES OF RAIN. |
| Sep 10, 3:05 PM PDT | HEAVY RAIN 1.54 | 6 Ssw Palomar Mountain, CA | LA JOLLA INDIAN RESERVATION...BETWEEN 1417-1505 PDT... MEASURED 1.54 INCHES OF RAIN. |
| Sep 10, 3:09 PM PDT | HEAVY RAIN 0.99 | 6 Wnw Lake Henshaw, CA | VALLECITOS REPEATER...BETWEEN 1422-1509 PDT...MEASURED 0.99 INCHES OF RAIN. |
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, 9.7 hours before the alert went out and 58 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
- 642 J/kg
- Mixed-layer CIN
- -197 J/kg
- Mixed-layer LCL
- 930 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
452 WGUS56 KSGX 102142 FFWSGX CAC073-102315- /O.NEW.KSGX.FF.W.0042.120910T2142Z-120910T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN DIEGO CA 242 PM PDT MON SEP 10 2012 THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA... * UNTIL 415 PM PDT * AT 236 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A STORM OVER THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PAUMA VALLEY. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. && LAT...LON 3336 11703 3336 11666 3309 11667 3309 11703 $$ SMALL
2 follow-up statements
201 WGUS76 KSGX 102219 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 319 PM PDT MON SEP 10 2012 CAC073-102315- /O.CON.KSGX.FF.W.0042.000000T0000Z-120910T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN DIEGO CA- 319 PM PDT MON SEP 10 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM PDT FOR CENTRAL SAN DIEGO COUNTY... AT 306 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE HEAVY RAIN PRODUCING FLASH FLOODING OVER THE WARNED AREA. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PAUMA VALLEY AND LAKE HENSHAW. TWO RAIN GAGES IN THE WARNING AREA HAVE REPORTED AROUND 1.50 INCHES IN THE PAST HOUR. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. && LAT...LON 3336 11703 3336 11666 3309 11667 3309 11703 $$ SMALL
511 WGUS76 KSGX 102311 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 411 PM PDT MON SEP 10 2012 CAC073-102318- /O.EXP.KSGX.FF.W.0042.000000T0000Z-120910T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN DIEGO CA- 411 PM PDT MON SEP 10 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 415 PM PDT FOR CENTRAL SAN DIEGO COUNTY... THE THUNDERSTORM HAS WEAKENED...SO THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE. LAT...LON 3336 11703 3336 11666 3309 11667 3309 11703 $$ SMALL
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 5:23 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 45 min |
| Sep 9, 5:30 PM PDT | Flash Flood Warning | SGX | San Diego | 104 min |
| Sep 9, 7:01 PM PDT | Flash Flood Watch | SGX | Riverside, San Bernardino, San Diego | 23 hr |
| Sep 9, 7:26 PM PDT | Blowing Dust Advisory | SGX | Riverside, San Diego | 3 hr |
| Sep 10, 12:21 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 119 min |
| Sep 10, 1:17 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 49 min |
| Sep 10, 1:29 PM PDT | Flash Flood Warning | SGX | San Bernardino | 3 hr |
| Sep 10, 2:00 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 3 hr |
| Sep 10, 2:33 PM PDT | Severe Thunderstorm Warning | SGX | Orange, Riverside | 50 min |
| Sep 10, 2:59 PM PDT | Flash Flood Warning | SGX | San Bernardino | 2 hr |
| Sep 10, 3:07 PM PDT | Special Weather Statement | SGX | Orange | 53 min |
| Sep 10, 4:34 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 116 min |
Nearby
Flash Flood Warnings in California, 2012Every flash flood warning in 2012
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.