Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 57, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 30, 2012, 11:25 AM PDT for Imperial County, California. It was in force for 2 hr. 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
- Aug 30, 2012, 11:25 AM PDT (18:25 UTC)
- Expired
- Aug 30, 2012, 1:30 PM PDT
- In force
- 2 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Imperial County, CA
The radar
The San Diego radar (KNKX), 108 km from the middle of the area, began a volume at 18:28 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 |
|---|---|---|---|
| Aug 30, 11:46 AM PDT | FLASH FLOOD | 2 W Mt. Signal, CA | ROAD CLOSURE AT SR 98 AND DREW RD. WATER RUNNING OVER ROADWAY |
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, 6.4 hours before the alert went out and 122 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2209 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
418
WGUS55 KPSR 301825
FFWPSR
CAC025-302030-
/O.NEW.KPSR.FF.W.0057.120830T1825Z-120830T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
1125 AM PDT THU AUG 30 2012
THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHWESTERN IMPERIAL COUNTY IN SOUTHEAST CALIFORNIA...
THIS INCLUDES PLASTER CITY...
* UNTIL 130 PM PDT
* AT 1116 AM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
DIXIELAND...THE OLD OVERLAND STAGE ROUTE...THE EVANS HEWES
HIGHWAY...STATE ROUTE 98 WEST OF MOUNT SIGNAL...AND INTERSTATE 8.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING
FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY
DRY WASHES AND CREEKS...ROADS...AND LOW LYING SPOTS. UNBRIDGED
CROSSINGS WILL BE ESPECIALLY DANGEROUS.
TO REPORT FLOODING...PLEASE RELAY YOUR REPORT TO LOCAL LAW
ENFORCEMENT WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 3290 11604 3295 11581 3264 11562 3263 11588
3273 11598
$$
MEYERS3 follow-up statements
140
WGUS75 KPSR 301856
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1156 AM PDT THU AUG 30 2012
CAC025-302030-
/O.CON.KPSR.FF.W.0057.000000T0000Z-120830T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
IMPERIAL CA-
1156 AM PDT THU AUG 30 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 PM PDT FOR
SOUTHWESTERN IMPERIAL COUNTY...
AT 1144 AM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUE TO
DETECT THUNDERSTORMS PRODUCING VERY HEAVY RAIN THAT WILL CAUSE FLASH
FLOODING. RADAR PRECIPITATION ESTIMATES INDICATE THAT APPROXIMATELY
TWO INCHES OF RAIN HAS FALLEN WITHIN THE LAST HOUR IN SOME
AREAS...MAINLY NEAR PLASTER CITY.
LOCATIONS IN THE WARNING INCLUDE INTERSTATE 8...DIXIELAND...THE OLD
OVERLAND STAGE ROUTE...THE EVANS HEWES HIGHWAY...AND STATE ROUTE 98
WEST OF MOUNT SIGNAL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING
FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY
DRY WASHES AND CREEKS...ROADS...AND LOW LYING SPOTS. UNBRIDGED
CROSSINGS WILL BE ESPECIALLY DANGEROUS.
TO REPORT FLOODING...PLEASE RELAY YOUR REPORT TO LOCAL LAW
ENFORCEMENT WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 3290 11604 3295 11581 3264 11562 3263 11588
3273 11598
$$
MEYERS452
WGUS75 KPSR 301947
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1247 PM PDT THU AUG 30 2012
CAC025-302030-
/O.CON.KPSR.FF.W.0057.000000T0000Z-120830T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
IMPERIAL CA-
1247 PM PDT THU AUG 30 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 PM PDT FOR
SOUTHWESTERN IMPERIAL COUNTY...
AT 1231 PM PDT...SHOWER AND THUNDERSTORM ACTIVITY HAS DIMINISHED.
HOWEVER...LIGHT TO MODERATE RAINFALL WILL PERSIST OVER THE AREA NEAR
PLASTER CITY AND OCOTILLO FOR THE NEXT HOUR OR SO. RUNOFF FROM THESE
STORMS WILL CONTINUE TO RAPIDLY FLOW INTO WASHES...CANALS AND LOW
LYING AREAS AND LEAD TO FLASH FLOODING.
LOCATIONS IN THE WARNING INCLUDE INTERSTATE 8 EAST OF OCOTILLO...
DIXIELAND...THE OLD OVERLAND STAGE ROUTE...THE EVANS HEWES
HIGHWAY...AND STATE ROUTE 98 WEST OF MOUNT SIGNAL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING
FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY
DRY WASHES AND CREEKS...ROADS...AND LOW LYING SPOTS. UNBRIDGED
CROSSINGS WILL BE ESPECIALLY DANGEROUS.
TO REPORT FLOODING...PLEASE RELAY YOUR REPORT TO LOCAL LAW
ENFORCEMENT WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 3290 11604 3295 11581 3264 11562 3263 11588
3273 11598
$$
MEYERS822
WGUS75 KPSR 302028
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
128 PM PDT THU AUG 30 2012
CAC025-302035-
/O.EXP.KPSR.FF.W.0057.000000T0000Z-120830T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
IMPERIAL CA-
128 PM PDT THU AUG 30 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 130 PM PDT FOR SOUTHWESTERN
IMPERIAL COUNTY...
RUNOFF FROM EARLIER STORMS WILL CONTINUE TO FLOW INTO WASHES...
CANALS AND LOW LYING AREAS OVER THE NEXT SEVERAL HOURS.
LOCATIONS THAT MAY CONTINUE TO BE IMPACTED BY VARYING DEGREES OF
INUNDATION INCLUDE INTERSTATE 8 EAST OF OCOTILLO...DIXIELAND...THE
OLD OVERLAND STAGE ROUTE...THE EVANS HEWES HIGHWAY...AND STATE ROUTE
98 WEST OF MOUNT SIGNAL.
LAT...LON 3290 11604 3295 11581 3264 11562 3263 11588
3273 11598
$$
MEYERSThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 6:43 PM PDT | Severe Thunderstorm Warning | PSR | Riverside, San Bernardino | 62 min |
| Aug 29, 7:49 PM PDT | Areal Flood Advisory | PSR | Riverside, San Bernardino | 3 hr |
| Aug 29, 9:09 PM PDT | Flash Flood Warning | PSR | Riverside | 105 min |
| Aug 30, 6:24 AM PDT | Areal Flood Advisory | PSR | Imperial | 111 min |
| Aug 30, 11:05 AM PDT | Special Weather Statement | PSR | Imperial | 40 min |
| Aug 30, 1:44 PM PDT | Areal Flood Warning | PSR | Imperial | 4 hr |
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.