Alert archive / California / Flash Flood Watches in 2012
Flash Flood Watch 13, NWS San Diego, CA
NWS San Diego, CA issued this flash flood watch at Sep 9, 2012, 7:01 PM PDT for Riverside County, San Bernardino County, San Diego County, California. It took effect at Sep 10, 2012, 10:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Sep 9, 2012, 7:01 PM PDT (02:01 UTC)
- In effect from
- Sep 10, 2012, 10:00 AM PDT
- Expired
- Sep 10, 2012, 5:58 PM PDT
- In force
- 8 hr
- Issued by
- NWS San Diego, CA
- Flood severity
- None
Counties Riverside County, CA, San Bernardino County, CA, San Diego County, CA
The radar
The Santa Ana Mts radar (KSOX), 122 km from the middle of the area, began a volume at 02:15 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 00:00Z, 2.0 hours before the alert went out and 145 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
- 137 J/kg
- Mixed-layer CIN
- -379 J/kg
- Mixed-layer LCL
- 1160 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
235 WGUS66 KSGX 100201 FFASGX URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE SAN DIEGO CA 701 PM PDT SUN SEP 9 2012 ...FLASH FLOOD WATCH FOR THE VALLEYS..MOUNTAINS AND DESERTS OF EXTREME SOUTHWEST CALIFORNIA ON MONDAY.. .DEEP MONSOONAL MOISTURE AND A WEAK AREA OF LOW PRESSURE MOVING NORTH FROM MEXICO WILL COMBINE TO BRING A THREAT OF HEAVY SHOWERS AND THUNDERSTORMS THROUGH MONDAY NIGHT. LOCALLY HEAVY RAIN AND FLASH FLOODING WILL BE POSSIBLE. THE MAIN THREAT WILL DEVELOP WITH DAYTIME HEATING AND CONTINUE INTO THE EVENING. THE THREAT FOR HEAVY RAIN WILL DIMINISH LATE MONDAY NIGHT. CAZ048-050-055-056-058-060>062-101300- /O.NEW.KSGX.FF.A.0013.120910T1700Z-120911T0700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE- SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS- RIVERSIDE COUNTY MOUNTAINS-SAN DIEGO COUNTY MOUNTAINS- APPLE AND LUCERNE VALLEYS-COACHELLA VALLEY- SAN DIEGO COUNTY DESERTS- 701 PM PDT SUN SEP 9 2012 ...FLASH FLOOD WATCH IN EFFECT FROM MONDAY MORNING THROUGH MONDAY EVENING... THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A * FLASH FLOOD WATCH FOR A PORTION OF SOUTHWEST CALIFORNIA... INCLUDING THE FOLLOWING AREAS...APPLE AND LUCERNE VALLEYS... COACHELLA VALLEY...RIVERSIDE COUNTY MOUNTAINS...SAN BERNARDINO COUNTY MOUNTAINS...SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS- THE INLAND EMPIRE...SAN DIEGO COUNTY DESERTS...SAN DIEGO COUNTY MOUNTAINS AND SAN DIEGO COUNTY VALLEYS. * FROM LATE MONDAY MORNING THROUGH MONDAY EVENING * LOW PRESSURE OVER NORTHWEST MEXICO AND DEEP MONSOONAL MOISTURE WILL COMBINE TO BRING A THREAT OF LOCALLY HEAVY RAIN AND FLASH FLOODING THROUGH MONDAY EVENING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ JAD
3 follow-up statements
936 WGUS66 KSGX 101007 FFASGX FLOOD WATCH NATIONAL WEATHER SERVICE SAN DIEGO CA 307 AM PDT MON SEP 10 2012 ...FLASH FLOOD WATCH FOR THE VALLEYS...MOUNTAINS...AND DESERTS OF EXTREME SOUTHWEST CALIFORNIA FOR LATE MORNING THROUGH EARLY EVENING TODAY... .MONSOONAL MOISTURE AND DAYTIME HEATING WILL BRING SCATTERED THUNDERSTORMS TO THE MOUNTAINS...DESERTS...AND INLAND VALLEYS FROM LATE MORNING THROUGH EARLY EVENING TODAY. LOCALLY HEAVY RAINFALL WITH FLASH FLOODING IS POSSIBLE. CAZ048-050-055-056-058-060>062-102100- /O.CON.KSGX.FF.A.0013.120910T1700Z-120911T0700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE- SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS- RIVERSIDE COUNTY MOUNTAINS-SAN DIEGO COUNTY MOUNTAINS- APPLE AND LUCERNE VALLEYS-COACHELLA VALLEY- SAN DIEGO COUNTY DESERTS- 307 AM PDT MON SEP 10 2012 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 10 AM PDT THIS MORNING THROUGH THIS EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF SOUTHWEST CALIFORNIA...INCLUDING THE FOLLOWING AREAS...APPLE AND LUCERNE VALLEYS...COACHELLA VALLEY... RIVERSIDE COUNTY MOUNTAINS...SAN BERNARDINO COUNTY MOUNTAINS... SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE...SAN DIEGO COUNTY DESERTS...SAN DIEGO COUNTY MOUNTAINS AND SAN DIEGO COUNTY VALLEYS. * FROM 10 AM PDT THIS MORNING THROUGH THIS EVENING * MONSOONAL MOISTURE AND DAYTIME HEATING WILL BRING SCATTERED THUNDERSTORMS TO THE MOUNTAINS...DESERTS...AND INLAND VALLEYS FROM LATE MORNING INTO THIS EVENING WITH LOCALLY HEAVY RAINFALL AND FLASH FLOODING POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ 17
617 WGUS66 KSGX 102004 FFASGX FLOOD WATCH NATIONAL WEATHER SERVICE SAN DIEGO CA 104 PM PDT MON SEP 10 2012 ...FLASH FLOOD WATCH FOR THE VALLEYS...MOUNTAINS...AND DESERTS OF EXTREME SOUTHWEST CALIFORNIA THROUGH EARLY EVENING TODAY... .MONSOONAL MOISTURE AND DAYTIME HEATING WILL CONTINUE TO BRING SCATTERED THUNDERSTORMS TO THE MOUNTAINS...DESERTS...AND INLAND VALLEYS THROUGH EARLY EVENING TODAY. LOCALLY HEAVY RAINFALL AND FLASH FLOODING ARE POSSIBLE. CAZ048-050-055-056-058-060>062-110300- /O.CON.KSGX.FF.A.0013.000000T0000Z-120911T0700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE- SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS- RIVERSIDE COUNTY MOUNTAINS-SAN DIEGO COUNTY MOUNTAINS- APPLE AND LUCERNE VALLEYS-COACHELLA VALLEY- SAN DIEGO COUNTY DESERTS- 104 PM PDT MON SEP 10 2012 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT PDT TONIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF SOUTHWEST CALIFORNIA...INCLUDING THE FOLLOWING AREAS...APPLE AND LUCERNE VALLEYS...COACHELLA VALLEY... RIVERSIDE COUNTY MOUNTAINS...SAN BERNARDINO COUNTY MOUNTAINS... SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE...SAN DIEGO COUNTY DESERTS...SAN DIEGO COUNTY MOUNTAINS AND SAN DIEGO COUNTY VALLEYS. * UNTIL MIDNIGHT PDT TONIGHT. * MONSOONAL MOISTURE AND DAYTIME HEATING WILL BRING SCATTERED THUNDERSTORMS TO THE MOUNTAINS...DESERTS...AND INLAND VALLEYS INTO THIS EVENING WITH LOCALLY HEAVY RAINFALL AND FLASH FLOODING POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ HARRISON
780 WGUS66 KSGX 110058 FFASGX FLOOD WATCH NATIONAL WEATHER SERVICE SAN DIEGO CA 558 PM PDT MON SEP 10 2012 CAZ048-050-055-056-058-060>062-110200- /O.CAN.KSGX.FF.A.0013.000000T0000Z-120911T0700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE- SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS- RIVERSIDE COUNTY MOUNTAINS-SAN DIEGO COUNTY MOUNTAINS- APPLE AND LUCERNE VALLEYS-COACHELLA VALLEY- SAN DIEGO COUNTY DESERTS- 558 PM PDT MON SEP 10 2012 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR A PORTION OF SOUTHWEST CALIFORNIA HAS BEEN CANCELLED. MOST OF THE PRECIPITATION HAD ENDED FOR TODAY. THERE IS A SLIGHT CHANCE OF THUNDERSTORMS OVERNIGHT IN THE MOUNTAINS AND DESERTS...BUT WIDESPREAD HEAVY RAIN IS NOT EXPECTED. $$ MAXWELL
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, 7:26 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, 2:42 PM PDT | Flash Flood Warning | SGX | San Diego | 93 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 Watches in California, 2012Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.