Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 56, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 29, 2012, 9:09 PM PDT for Riverside County, California. It was in force for 105 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 29, 2012, 9:09 PM PDT (04:09 UTC)
- Expired
- Aug 29, 2012, 10:54 PM PDT
- In force
- 105 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Riverside County, CA
The radar
The Yuma radar (KYUX), 172 km from the middle of the area, began a volume at 04:12 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
Yuma Prvg Ground, AZ (K1Y7), launched 00:00Z, 4.2 hours before the alert went out and 182 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
- 1190 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 1814 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
879
WGUS55 KPSR 300409
FFWPSR
CAC065-300700-
/O.NEW.KPSR.FF.W.0056.120830T0409Z-120830T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
909 PM PDT WED AUG 29 2012
THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL MIDNIGHT PDT
* AT 902 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING. RADAR INDICATED THAT
UP TO THREE INCHES OF RAIN HAD FALLEN SINCE 8 PM IN AREAS TO THE
NORTHEAST OF EAGLE MOUNTAIN...AND NEAR OR ALONG HIGHWAY 177. HEAVY
RAIN IN THE WARNING AREA WILL DRAIN TOWARDS THE SOUTH...ALONG AND
TO THE EAST OF HIGHWAY 177 TOWARDS INTERSTATE 10. SOME FLOODING MAY
ALSO AFFECT THE FAR EASTERN PORTION OF JOSHUA TREE NATIONAL PARK.
* THE STORM PRODUCING VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING
WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED
COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND
CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES
AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED
CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL
BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA.
MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING
FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
TO REPORT FLOODING...PLEASE RELAY YOUR REPORT TO LOCAL LAW
ENFORCEMENT WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 3402 11550 3402 11530 3406 11526 3407 11510
3369 11508 3376 11536
$$
CB2 follow-up statements
986
WGUS75 KPSR 300501
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1001 PM PDT WED AUG 29 2012
CAC065-300700-
/O.CON.KPSR.FF.W.0056.000000T0000Z-120830T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-
1001 PM PDT WED AUG 29 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT PDT FOR
CENTRAL RIVERSIDE COUNTY...
AT 949 PM PDT...THUNDERSTORMS IN THE WARNING AREA ACROSS FAR NORTH
CENTRAL RIVERSIDE COUNTY HAD DECREASED SUBSTANTIALLY AND SINCE 9 PM
MOST OF THE BASINS TO THE NORTHEAST OF EAGLE MOUNTAIN HAD RECEIVED
LESS THAN ONE INCH OF RAINFALL. HOWEVER...BETWEEN 2 AND 3 INCHES OF
RAIN FELL ACROSS SOME OF THE BASINS ALONG AND TO THE EAST OF HIGHWAY
177 SINCE ABOUT 8 PM AND FLOODING CONTINUES TO BE LIKELY NORTH AND
NORTHEAST OF DESERT CENTER AND EAGLE MOUNTAIN. WATER WILL CONTINUE
TO DRAIN TOWARDS THE SOUTH ALONG AND TO THE EAST OF HIGHWAY
177...TOWARDS INTERSTATE 10. AS A RESULT THE FLASH FLOOD WARNING
WILL BE ALLOWED TO CONTINUE UNTIL MIDNIGHT TONIGHT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND
CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES
AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED
CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL
BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA.
MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING
FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
TO REPORT FLOODING...PLEASE RELAY YOUR REPORT TO LOCAL LAW
ENFORCEMENT WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 3402 11550 3402 11530 3406 11526 3407 11510
3369 11508 3376 11536
$$
CB580
WGUS75 KPSR 300554
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1054 PM PDT WED AUG 29 2012
CAC065-300603-
/O.CAN.KPSR.FF.W.0056.000000T0000Z-120830T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-
1054 PM PDT WED AUG 29 2012
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL RIVERSIDE
COUNTY...
THUNDERSTORMS IN THE WARNING AREA DISSIPATED AFTER 10 PM AND LITTLE
RAIN HAS FALLEN IN THE PAST HOUR. AS A RESULT THE FLASH FLOOD
WARNING HAS BEEN CANCELLED. MOTORISTS DRIVING ALONG HIGHWAY 177
NORTH OF DESERT CENTER...OR OVER ROADS ACROSS NORTH CENTRAL
RIVERSIDE COUNTY...SHOULD BE ALERT FOR WATER OVER THE ROAD THIS
EVENING AND DRIVE WITH CAUTION.
NO REPORTS OF FLOODING HAVE BEEN RECEIVED IN THE WARNING AREA.
LAT...LON 3402 11550 3402 11530 3406 11526 3407 11510
3369 11508 3376 11536
$$
CBThe 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 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, 11:25 AM PDT | Flash Flood Warning | PSR | Imperial | 2 hr |
| 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.